View MAX4188_111616.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1369; Rev 0; 7/98
KIT ATION EVALU ABLE AVAIL
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
General Description
The MAX4188/MAX4189/MAX4190 are low-power, current-feedback video amplifiers featuring fast disable/enable times and low switching transients. The triple MAX4188 and the single MAX4190 are optimized for applications with closed-loop gains of +2V/V (6dB) or greater and provide a -3dB bandwidth of 200MHz and 185MHz, respectively. The triple MAX4189 is optimized for closed-loop applications with gains of +1V/V (0dB) or greater and provides a 250MHz -3dB bandwidth. These amplifiers feature 0.1dB gain flatness up to 80MHz with differential gain and phase errors of 0.03% and 0.05. These features make the MAX4188 family ideal for video applications. The MAX4188/MAX4189/MAX4190 operate from a +5V single supply or from 2.25V to 5.5V dual supplies. These amplifiers consume only 1.5mA per amplifier and are capable of delivering 55mA of output current, making them ideal for portable and battery-powered equipment. The MAX4188/MAX4189/MAX4190 have a high-speed disable/enable mode that isolates the inputs, places the outputs in a high-impedance state, and reduces the supply current to 450A per amplifier. Each amplifier can be disabled independently. High off isolation, low switching transient, and fast enable/disable times (120ns/35ns) allow these amplifiers to be used in a wide range of multiplexer applications. A settling time of 22ns to 0.1%, a slew rate of up to 350V/s, and low distortion make these devices useful in many generalpurpose, high-speed applications. The MAX4188/MAX4189 are available in a tiny 16-pin QSOP package, and the MAX4190 is available in a space-saving 8-pin MAX package.
Features
o Low Supply Current: 1.5mA per Amplifier o Fast Enable/Disable Times: 120ns/35ns o Very Low Switching Transient: 45mVp-p o High Speed 200MHz -3dB Small-Signal Bandwidth (MAX4188, AVCL +2) 250MHz -3dB Small-Signal Bandwidth (MAX4189, AVCL +1) 185MHz -3dB Small-Signal Bandwidth (MAX4190, AVCL +2) o High Slew Rate 350V/s (MAX4188, AVCL +2) 175V/s (MAX4189, AVCL +1) o Excellent Video Specifications 85MHz -0.1dB Gain Flatness (MAX4190) 30MHz -0.1dB Gain Flatness (MAX4189) Differential Gain/Phase Errors 0.03%/0.05 (MAX4188) o Low-Power Disable Mode Inputs Isolated, Outputs Placed in High-Z Supply Current Reduced to 450A per Amplifier o Fast Settling Time of 22ns to 0.1% o Low Distortion 70dB SFDR (fc = 5MHz, VO = 2Vp-p, MAX4188) o Available in Space-Saving Packages 16-Pin QSOP (MAX4188/MAX4189) 8-Pin MAX (MAX4190)
MAX4188/MAX4189/MAX4190
Applications
High-Definition Surveillance Video High-Speed Switching/Multiplexing Portable/Battery-Powered Video/Multimedia Systems High-Speed Analog-to-Digital Buffers Medical Imaging High-Speed Signal Processing Professional Cameras CCD Imaging Systems RGB Distribution Amplifiers
Pin Configuration appears at end of data sheet.
MAX4190 MAX4188 MAX4189
PART OPTIMIZED FOR: AMPLIFIERS PER PKG. PIN-PACKAGE
Ordering Information
PART MAX4188ESD MAX4188EEE TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 14 SO 16 QSOP
Ordering Information continued at end of data sheet.
Selector Guide
AV +2V/V AV +1V/V AV +2V/V
3 3 1
14-pin SO, 16-pin QSOP 14-pin SO, 16-pin QSOP 8-pin MAX/SO 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)................................................+12V IN_+, IN_-, DISABLE_ Voltage .........(VEE - 0.3V) to (VCC + 0.3V) Differential Input Voltage (IN_+ to IN_-)..............................1.5V Maximum Current into IN_+ or IN_-..................................10mA Output Short-Circuit Current Duration........................Continuous Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.88mW/C above +70C)...............471mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 14-Pin SO (derate 8.3mW/C above +70C) ..................667mW 16-Pin QSOP (derate 8.3mW/C above +70C)...............667mW Operating Temperature Range............................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS--Dual Supplies
(VCC = +5V; VEE = -5V; IN+ = 0; DISABLE_ 3.2V; MAX4188: AV = +2V/V, RF = RG = 910 for RL = 1k and RF = RG = 560 for RL = 150; MAX4189: AV = +1V/V, RF = 1600 for RL = 1k and RF = 1100 for RL = 150; MAX4190: AV = +2V/V, RF = RG = 1300 for RL = 1k, RF = RG = 680 for RL = 150; TA = TMIN to TMAX, unless otherwise noted. Typical values are specified at TA = +25C.) PARAMETER Operating Supply Voltage Input Voltage Range Input Offset Voltage Input Offset Voltage Tempco Input Offset Voltage Matching Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Input Capacitance (Positive Input) Common-Mode Rejection Ratio Open-Loop Transresistance Output Voltage Swing Output Current Output Short-Circuit Current Output Resistance Disabled Output Leakage Current Disabled Output Capacitance DISABLE Low Threshold DISABLE High Threshold DISABLE Input Current Power-Supply Rejection Ratio (VCC) Power-Supply Rejection Ratio (VEE) Quiescent Supply Current (per Amplifier) Disabled Supply Current (per Amplifier) 2 IB+ IBRIN+ RINCIN CMRR TR VSW IOUT ISC ROUT IOUT(OFF) DISABLE_ VIL, VOUT 3.5V (Note 2) COUT(OFF) DISABLE_ VIL, VOUT 3.5V VIL VIH IIN PSRR+ PSRRIS IS(OFF) (Note 3) (Note 3) VEE DISABLE_ VCC VEE = -5V, VCC = 4.5V to 5.5V VCC = 5V, VEE = -4.5V to -5.5V RL = open DISABLE_ VIL, RL = open 60 60 VCC - 1.8 0.1 75 73 1.5 0.45 1.85 0.65 2 -3.1V VCM 3.1V -3.1V VOUT 3.1V, RL = 1k -2.8V VOUT 2.8V, RL = 150 RL = 1k RL = 150 RL = 30 56 1 0.3 3.5 3.0 20 -3.1V VCM 3.1V, VIN+ - VIN- 1V 100 VCM VOS TCVOS SYMBOL CONDITIONS Inferred from PSRR tests Guaranteed by CMRR test VCM = 0 (Note 1) MIN 2.25 3.1 3.4 1 10 1 1 2 350 300 2.5 68 7 2 4.0 3.3 55 60 0.2 0.8 5 VCC - 3 5 10 12 6 TYP MAX 5.5 UNITS V V mV V/C mV A A k pF dB M V mA mA A pF V V A dB dB mA mA
_______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
DC ELECTRICAL CHARACTERISTICS--Single Supply
(VCC = +5V; VEE = 0; IN+ = 2.5V; DISABLE_ 3.2V; RL to VCC / 2; MAX4188: AV = +2V/V, RF = RG = 1.1k for RL = 1k and RF = RG = 620 for RL = 150; MAX4189: AV = +1V/V, RF = 1500 for RL = 1k and RF = 1600 for RL = 150; MAX4190: AV = +2V/V, RF = RG = 1300 for RL = 1k, RF = RG = 680 for RL = 150; TA = TMIN to TMAX, unless otherwise noted. Typical values are specified at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage Input Voltage Range Input Offset Voltage Input Offset Voltage Tempco Input Offset Voltage Matching Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Input Capacitance (Positive Input) Common-Mode Rejection Ratio Open-Loop Transresistance IB+ IBRIN+ RINCIN CMRR TR 1.5V VCM 3.5V 1.3V VOUT 3.7V, RL = 1k 1.45V VOUT 3.55V, RL = 150 RL = 1k Output Voltage Swing VSW RL = 150 Output Current Output Short-Circuit Current Output Resistance Disabled Output Leakage Current Disabled Output Capacitance DISABLE Low Threshold DISABLE High Threshold DISABLE Input Current Power-Supply Rejection Ratio (VCC) Quiescent Supply Current (per Amplifier) Disabled Supply Current (per Amplifier) IOUT ISC ROUT IOUT(OFF) DISABLE_ VIL, 1.2V VOUT 3.8V (Note 2) RL = 30 48 1.0 0.2 1.2 to 3.8 1.4 to 3.6 16 1.6V VCM 3.4V, VIN+ - VIN- 1V 100 VCM VOS TCVOS Inferred from PSRR tests Guaranteed by CMRR test VCM = 2.5V (Note 1) 4.5 1.6 to 3.4 1.3 to 3.7 1.5 10 1 1 2 350 300 2.5 65 6.5 1.0 0.9 to 4.1 1.15 to 3.85 28 50 0.2 0.8 5 VCC - 3 VCC - 1.8 0.1 60 75 1.5 0.45 1.85 0.65 2 5 10 12 6.0 5.5 V V mV V/C mV A A k pF dB M
MAX4188/MAX4189/MAX4190
V
mA mA A pF V V A dB mA mA
COUT(OFF) DISABLE_ VIL, 1.2V VOUT 3.8V VIL VIH IIN PSRR+ IS IS(OFF) (Note 3) (Note 3) 0 DISABLE_ VCC VCC = 4.5V to 5.5V RL = open DISABLE_ VIL, RL = open
_______________________________________________________________________________________
3
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4188)
(VCC = +5V, VEE = -5V, VIN = 0, DISABLE_ 3V, AV = +2V/V, RF = RG = 910 for RL = 1k or RF = RG = 560 for RL = 150; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error Differential Gain Error Input Noise Voltage Density Input Noise Current Density Output Impedance Crosstalk All Hostile Off Isolation Gain Matching to 0.1dB Amplifier Enable Time Amplifier Disable Time Disable/Enable Switching Transient tON tOFF Delay from DISABLE to 90% of VOUT, VIN = 0.5V Delay from DISABLE to 10% of VOUT, VIN = 0.5V Positive transient Negative transient DP DG en in ZOUT SFDR BW0.1dB BWLS SR tS SYMBOL BW-3dB RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 VOUT = 2Vp-p VOUT = 4V step, RL = 150 VOUT = 4V step VOUT = 4V step fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred f = 10MHz, input referred Positive input Negative input Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 200 160 0.25 0.1 60 80 100 100 350 280 22 10 12 70 56 -70 -66 -73 -56 0.05 0.32 0.03 0.04 2 4 5 4 -55 -65 100 120 35 30 15 MAX UNITS MHz dB MHz MHz V/s V/s ns ns dB dBc dBc degrees % nV/Hz pA/Hz dB dB MHz ns ns mV
4
_______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4189)
(VCC = +5V, VEE = -5V, VIN = 0, DISABLE_ 3V, AV = +1V/V, RF = 1600 for RL = 1k and RF = 1100 for RL = 150; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error Differential Gain Error Input Noise Voltage Density Input Noise Current Density Output Impedance Crosstalk All Hostile Off Isolation Gain Matching to 0.1dB Amplifier Enable Time Amplifier Disable Time Disable/Enable Switching Transient tON tOFF Delay from DISABLE to 90% of VOUT, VIN = 0.5V Delay from DISABLE to 10% of VOUT, VIN = 0.5V Positive transient Negative transient DP DG en in ZOUT SFDR BW0.1dB BWLS SR tS SYMBOL BW-3dB RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 VOUT = 2Vp-p VOUT = 4V step, RL = 150 VOUT = 4V step VOUT = 4V step fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred f = 10MHz, input referred Positive input Negative input Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 250 210 1.4 0.15 7 30 60 55 175 150 28 20 22 65 51 -65 -63 -70 -51 0.02 0.66 0.07 0.18 2 4 5 4 -57 -55 24 120 40 70 110 MAX UNITS MHz dB MHz MHz V/s V/s ns ns dB dBc dBc degrees % nV/Hz pA/Hz dB dB MHz ns ns mV
MAX4188/MAX4189/MAX4190
_______________________________________________________________________________________
5
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
AC & DYNAMIC PERFORMANCE--Dual Supplies (MAX4190)
(V CC = +5V, V EE = -5V, V IN = 0, A V = +2V/V; R F = R G = 1300 for R L = 1k and R F = R G = 680 for R L = 150, TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Gain Error Differential Phase Error Input Noise Current Density Input Noise Voltage Density Output Impedance All Hostile Off Isolation Turn-On Time from DISABLE Turn-Off Time from DISABLE Disable/Enable Switching Transient tON tOFF BWLS Positive transient Negative transient en ZOUT DG DP BWLS BWLS SR tS tR tF SYMBOL BWSS RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150k VO = 2Vp-p VO = 4V step, RL = 150 VO = 2V step VO = 4V step, RL = 150 fC = 5MHz, VO = 2Vp-p fC = 5MHz, VO = 2Vp-p fC = 5MHz, VO = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive input Negative input RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 185 150 0.1 0.1 85 75 95 95 340 270 22 10 12 61 55 -65 -55 -73 -61 0.03 0.07 0.06 0.45 4 5 2 4 -60 120 35 30 15 MAX UNITS MHz dB MHz MHz V/s ns ns dB dBc dBc degrees degrees pA/Hz nV/Hz dB ns ns mV
6
_______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4188)
(VCC = +5V, VEE = 0, VIN = 2.5V, DISABLE_ 3V, RL to VCC / 2, AV = +2V/V, RF = RG = 1.1k for RL = 1k to VCC / 2 and RF = RG = 620 for RL = 150; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error Differential Gain Error Input Noise Voltage Density Input Noise Current Density Output Impedance Crosstalk All Hostile Off Isolation Gain Matching to 0.1dB Amplifier Enable Time Amplifier Disable Time Disable/Enable Switching Transient tON tOFF Delay from DISABLE to 90% of VOUT, VIN = 3V Delay from DISABLE to 10% of VOUT, VIN = 3V Positive transient Negative transient DP DG en in ZOUT SFDR BW0.1dB BWLS SR tS SYMBOL BW-3dB RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 VOUT = 2Vp-p VOUT = 2V step step, OUT RL = 150 VOUT = 2V step VOUT = 2V step fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred f = 10MHz, input referred Positive input Negative input Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 185 145 0.1 0.1 110 65 80 80 300 230 20 8 9 66 56 -76 -59 -66 -56 0.06 0.34 0.02 0.05 2 4 5 4 -55 -65 40 120 35 30 15 MAX UNITS MHz dB MHz MHz V/s V/s ns ns dB dBc dBc degrees % nV/Hz pA/Hz dB dB MHz ns ns mV
MAX4188/MAX4189/MAX4190
_______________________________________________________________________________________
7
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4189)
(VCC = +5V, VEE = 0, VIN = 2.5V, DISABLE_ 3V, RL to VCC / 2, AV = +1V/V, RF = 1500 for RL = 1k and RF = 1600 for RL = 150; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error Differential Gain Error Input Noise Voltage Density Input Noise Current Density Output Impedance Crosstalk All Hostile Off Isolation Gain Matching to 0.1dB Amplifier Enable Time Amplifier Disable Time Disable/Enable Switching Transient tON tOFF Delay from DISABLE to 90% of VOUT, VIN = 3V Delay from DISABLE to 10% of VOUT, VIN = 3V Positive transient Negative transient DP DG en in ZOUT SFDR BW0.1dB BWLS SR tS SYMBOL BW-3dB RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 VOUT = 2Vp-p VOUT = 2V step, RL = 150 VOUT = 2V step VOUT = 2V step fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred f = 10MHz, input referred Positive input Negative input Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 230 190 1.4 0.15 7 40 50 45 160 135 25 12 15 57 47 -58 -54 -57 -47 0.04 0.66 0.06 0.17 2 4 5 4 -57 -55 25 120 40 70 110 MAX UNITS MHz dB MHz MHz V/s ns ns dB dBc dBc degrees % nV/Hz pA/Hz dB dB MHz ns ns mV
Note 1: Input Offset Voltage does not include the effect of IBIAS flowing through RF/RG. Note 2: Does not include current through external feedback network. Note 3: Over operating supply-voltage range.
8
_______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
AC & DYNAMIC PERFORMANCE--Single Supply (MAX4190)
(V CC = +5V, V EE = 0, V IN = 0, A V = +2V/V; R F = R G = 1500 for R L = 1k and R F = R G = 750 for R L = 150, TA = +25C, unless otherwise noted) PARAMETER Small-Signal -3dB Bandwidth Peaking Bandwidth for 0.1dB Flatness Large-Signal -3dB Bandwidth Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Gain Error Differential Phase Error Input Noise Voltage Density Input Noise Current Density Output Impedance All Hostile Off Isolation Turn-On Time from DISABLE Turn-Off Time from DISABLE Disable/Enable Switching Transient tON tOFF BWLS Positive transient Negative transient in ZOUT DG DP BW0.1dB BWLS SR tS tR tF SYMBOL BW-3dB RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 VO = 2Vp-p VO = 2V step, RL = 150 VO = 2V step VO = 2V step, RL = 150 fC = 5MHz, VO = 2Vp-p fC = 5MHz, VO = 2Vp-p fC = 5MHz, VO = 2Vp-p NTSC NTSC f = 10kHz f = 10kHz f = 10MHz f = 10MHz, input referred, RL = 150 Positive input Negative input Rise time Fall time RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Positive slew Negative slew CONDITIONS MIN TYP 165 135 0.1 0.1 70 65 75 75 290 220 20 8 9 59 55 -59 -55 -68 -60 0.02 0.08 0.07 0.43 2 4 5 4 -60 120 35 30 15 MAX UNITS MHz dB MHz MHz V/s ns ns dB dBc dBc % degrees nV/Hz pA/Hz dB ns ns mV
MAX4188/MAX4189/MAX4190
_______________________________________________________________________________________
9
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4188 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc01
MAX4188 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc02
MAX4188 GAIN FLATNESS vs. FREQUENCY (DUAL SUPPLIES)
0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 RF = RG = 390 RL = 100 VIN = 20mVp-p AV = +2V/V 1 10 100 1000 RF = RG = 620 RL = 150 RF = RG = 910 RL = 1k
MAX4188toc03
10 9 8 7 GAIN (dB) 6 5 4 3 2 1 0 1 10 100 VIN = 20mVp-p AV = +2V/V RF = RG = 390 RL = 100 RF = RG = 910k RF = RG = 560 R = 1k L RL = 150
10 9 8 7 GAIN (dB) 6 5 4 3 2 1 0 VEE = 0V VIN = 20mVp-p AV = +2V/V 1 10 100 RF = RG = 620 RL = 150 RF = RG = 430 RL = 100 RF = RG = 1.1k RL = 1k
0.4
-0.4 -0.5 -0.6 1000
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4189 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc04
MAX4189 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc05
MAX4189 GAIN FLATNESS vs. FREQUENCY (DUAL SUPPLIES)
0.1 0 -0.1 GAIN (dB) -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 VIN = 20mVp-p AV = +1V/V 1 10 100 1000 RF = 680 RL = 100 RF = 1.1k RL = 150
MAX4188toc06
4 3 2 1 GAIN (dB) RF = 680 RL = 100 RF = 1.6k RL = 1k
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VEE = 0 VIN = 20mVp-p AV = +1V/V 1 10 RF = 1.6k RL = 150 RF = 910 RL = 100 RF = 1.5k RL = 1k
0.2
0 -1 -2 -3 -4 -5 -6 1 10 100 1000 FREQUENCY (MHz) VIN = 20mVp-p AV = +1V/V RF = 1.1k RL = 150
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4188 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc07
MAX4188 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc08
MAX4188 SMALL-SIGNAL GAIN MATCHING vs. FREQUENCY
2.0 1.5 GAIN MATCHING (dB) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 VIN = 20mVp-p RF = RG = 750 RL = 1k AV = +2V/V 1 10 CH2-CH3 CH1-CH3
MAX4188toc09
10 9 8 7 GAIN (dB) 6 5 4 3 2 1 0 1 10 100 VIN = 1Vp-p AV = +2V/V RF = RG = 910 RL = 1k RF = RG = 560 RL = 150
10 9 8 7 GAIN (dB) 6 5 4 3 2 1 0 VEE = 0 VIN = 1Vp-p AV = +2V/V 1 10 100 RF = RG = 1.1k RL = 1k RF = RG = 620 RL = 150
2.5
CH1-CH2
1000
1000
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
10
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
____________________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4189 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc10
MAX4189 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc11
MAX4189 SMALL-SIGNAL GAIN MATCHING vs. FREQUENCY
2.0 1.5 1.0 GAIN (dB) 0.5 0 -0.5 -1.0 VIN = 2Vp-p RF = 1.6k RL = 1k AV = +1V/V 1 10 CH_3-CH_2 CH_1-CH_3 CH_1-CH_2
MAX4188toc12
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 1 10 100 VIN = 2Vp-p AV = 1V/V RF = 1.1k RL = 150 RF = 1.6k RL = 1k
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VEE = 0 VIN = 2Vp-p AV = +1V/V 1 10 100 RF = 1.6k RL = 150 RF = 1.5k RL = 1k
2.5
-1.5 -2.0 -2.5 1000
1000
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4188 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc13
MAX4188 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc14
MAX4188 CROSSTALK vs. FREQUENCY (DUAL SUPPLIES)
-10 -20 CROSSTALK (dBc) VOUT = 2Vp-p RL = 150
MAX4188toc15
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 3RD (RL = 1k) 2ND (RL = 1k) 3RD (RL = 150) 2ND (RL = 150) VOUT = 2Vp-p
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD (RL = 1k) 0.1 1 10 2ND (RL = 1k) 2ND (RL = 150) 3RD (RL = 150) VOUT = 2Vp-p
0
-30 -40 -50 -60 -70 -80
100
100
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4189 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES)
MAX4188toc16
MAX4189 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY)
MAX4188toc17
MAX4189 CROSSTALK vs. FREQUENCY (DUAL SUPPLIES)
-10 -20 VOUT = 2Vp-p RL = 150
MAX4188toc18
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 2ND (RL = 1k) 3RD (RL = 1k) 3RD (RL = 150) 2ND (RL = 150) VOUT = 2Vp-p
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD (RL = 1k) 2ND (RL = 1k) 3RD (RL = 150) 2ND (RL = 150) VOUT = 2Vp-p
0
CROSSTALK (dBc)
-30 -40 -50 -60 -70 -80
100
0.1
1
10
100
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
______________________________________________________________________________________
11
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
____________________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
INPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY
MAX4180 TOC19
TOTAL VOLTAGE-NOISE DENSITY vs. FREQUENCY (INPUT REFERRED)
MAX4188toc20
-3dB BANDWIDTH vs. INPUT AMPLITUDE
MAX4189 300 -3dB BANDWIDTH (MHz) MAX4188 250 200 150 100 50 0 DUAL SUPPLIES: RL = 1k, AV = +2V/V, RF = RG = 910 FOR MAX4188; AV = +1V/V, RF = 1.6k FOR MAX4189 0.02 0.1 INPUT AMPLITUDE (Vp-p) 1 2
MAX4188toc21
3.4 VOLTAGE-NOISE DENSITY (nV/Hz) 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 100 1k 10k 100k 1M 10M 100M
28 TOTAL VOLTAGE-NOISE DENSITY (nV/Hz) VIN 24
MAX4188
350
VOUT
20 16 910k 12 8 4 910k
1G
100
1k
10k
100k
1M
10M 100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4188toc22
OUTPUT IMPEDANCE vs. FREQUENCY (DUAL SUPPLIES)
SUPPLY CURRENT PER AMPLIFIER (mA) RL = 1k, AV = +2V/V, RF = RG = 910 FOR MAX4188; AV = +1 V/V, RF = 1.6k FOR MAX4189
MAX4188-23
SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4188toc24
0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 0.1 1 10 100 VEE (MAX4188) VEE (MAX4189) VCC (MAX4189) VCC (MAX4188)
1k
1.6 VCC = 5V; VEE = -5V 1.5
OUTPUT IMPEDANCE ()
100
10 MAX4189 MAX4188 1
1.4
VCC = 5V; VEE = 0
1.3
0.1 1000 0.1 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz)
1.2 -40 -20 0 20 40 60 80 TEMPERATURE (C)
INPUT OFFSET VOLTAGE (VOS) vs. TEMPERATURE
1.8 1.6 1.4 VOS (mV) 1.2 1.0 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 80 TEMPERATURE (C) 0 -40 -20
MAX4188toc25
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4188toc26
DISABLED SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
DISABLED SUPPLY CURRENT PER AMPLIFIER (mA)
MAX4188toc27
2.0
5
0.5
INPUT BIAS CURRENT (A)
4
VCC = 5V 0.4 VCC = 2.5V
3 IB - (POSITIVE INPUT) 2
0.3
1
IB - (NEGATIVE INPUT)
0.2 -40 -20 0 20 40 60 80 TEMPERATURE (C)
0
20
40
60
80
TEMPERATURE (C)
12
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
____________________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE SWING vs. TEMPERATURE
MAX4188toc28
MAX4188 ENABLE/DISABLE RESPONSE
MAX4188toc29
MAX4189 POWER-ON RESPONSE
10V VCC 0V
MAX4188toc30
1.8 VOL - VEE; RL = 150 (VCC-VOH) AND (VOL-VEE) (mV) 1.6
4V DISABLE 0V
1.4
VCC - VOH; RL = 150 2V VOL - VEE; RL = 1k VCC - VOH; RL = 1k OUT 0V VOUT 2V/div 0V 50ns/div AV = +2V/V, RF = RG = 910, RL = 1k, VIN = 1V 200ns/div AV = +1V/V, RL = 1k, RF = 1.6k, VEE = 0
1.2
1.0
0.8 -40 -20 0 20 40 60 80 TEMPERATURE (C)
MAX4188 SMALL-SIGNAL PULSE RESPONSE
MAX4188toc31
MAX4188 SMALL-SIGNAL PULSE RESPONSE (WITH CLOAD)
MAX4188toc32
MAX4188 LARGE-SIGNAL PULSE RESPONSE
+1V IN -1V
MAX4188toc33
+25mV IN -25mV
+25mV IN -25mV
+50mV OUT -50mV 10ns/div AV = +2V/V, RF = RG = 910, RL = 1k
+50mV OUT -50mV 10ns/div AV = +2V/V, RF = RG = 910, RL = 1k, CL = 47pF
+2V OUT -2V 10ns/div AV = +2V/V, RF = RG = 910, RL = 1k
______________________________________________________________________________________
13
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
____________________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4189 SMALL-SIGNAL PULSE RESPONSE (WITH CLOAD)
MAX4188toc34 MAX4188toc35
MAX4189 SMALL-SIGNAL PULSE RESPONSE
+50mV IN -50mV +50mV IN -50mV
MAX4189 LARGE-SIGNAL PULSE RESPONSE
+2V IN -2V
MAX4188toc36
+50mV OUT -50mV 10ns/div AV = +1V/V, RF = 1.1k, RL = 150
+50mV OUT -50mV 10ns/div AV = +1V/V, RF = 1.6k, RL = 1k, CL = 47pF
+2V OUT -2V 10ns/div AV = +1V/V, RF = 1.1k, RL = 150
MAX4188 SWITCHING TRANSIENT
MAX4188toc37
MAX4189 SWITCHING TRANSIENT
MAX4188toc38
OFF-CHANNEL FEEDTHROUGH vs. FREQUENCY (DUAL SUPPLIES)
RL = 150 OFF-CHANNEL FEEDTHROUGH (dB) -35 -45 -55 -65 -75 -85 -95 1 10 100 1000 FREQUENCY (MHz)
MAX4188toc39
-25
3V DISABLE 0V
3V DISABLE
0V OUT 0V 20mV/div 100ns/div AV = +2V/V, RF = 910, RL = 1k, VIN = 0 100ns/div AV = +1V/V, RF = 1.6k, RL = 1k, VIN = 0 OUT 100mV/div
14
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
Pin Descriptions
PIN MAX4188/MAX4189 SO 1 2 3 4 5 6 7 -- 8 9 10 11 12 13 14 -- -- -- -- QSOP 1 2 3 4 5 6 7 8, 9 10 11 12 13 14 15 16 -- -- -- -- MAX4190 SO/MAX -- -- -- 7 -- -- -- 1, 5 -- -- -- 4 -- -- -- 2 3 6 8 DISABLE1 DISABLE2 DISABLE3 VCC IN1+ IN1OUT1 N.C. OUT3 IN3IN3+ VEE IN2+ IN2OUT2 ININ+ OUT DISABLE Disable Control Input for Amplifier 1. Amplifier 1 is enabled when DISABLE1 (VCC - 2V) and disabled when DISABLE1 (VCC - 3V). Disable Control Input for Amplifier 2. Amplifier 2 is enabled when DISABLE2 (VCC - 2V) and disabled when DISABLE2 (VCC - 3V). Disable Control Input for Amplifier 3. Amplifier 3 is enabled when DISABLE3 (VCC - 2V) and disabled when DISABLE3 (VCC - 3V). Positive Power Supply. Connect VCC to +5V. Amplifier 1 Noninverting Input Amplifier 1 Inverting Input Amplifier 1 Output No Connect. Not internally connected. Amplifier 3 Output Amplifier 3 Inverting Input Amplifier 3 Noninverting Input Negative Power Supply. Connect VEE to -5V or to ground for single-supply operation. Amplifier 2 Noninverting Input Amplifier 2 Inverting Input Amplifier 2 Output Amplifier Inverting Input Amplifier Noninverting Input Amplifier Output Disable Control Input. Amplifier is enabled when DISABLE (VCC - 2V) and disabled when DISABLE (VCC - 3V). NAME FUNCTION
MAX4188/MAX4189/MAX4190
Detailed Description
The MAX4188/MAX4189/MAX4190 are very low-power, current-feedback amplifiers featuring bandwidths up to 250MHz, 0.1dB gain flatness to 80MHz, and low differential gain (0.03%) and phase (0.05) errors. These amplifiers achieve very high bandwidth-to-power ratios while maintaining low distortion, wide signal swing, and excellent load-driving capabilities. They are optimized for 5V supplies but are also fully specified for single +5V operation. Consuming only 1.5mA per amplifier, these devices have 55mA output current drive capability and achieve low distortion even while driving 150 loads.
Wide bandwidth, low power, low differential phase/gain error, and excellent gain flatness make the MAX4188 family ideal for use in portable video equipment such as video cameras, video switchers, and other batterypowered equipment. Their two-stage design provides higher gain and lower distortion than conventional single-stage, current-feedback amplifiers. This feature, combined with a fast settling time, makes these devices suitable for buffering high-speed analog-to-digital converters. The MAX4188/MAX4189/MAX4190 have a high-speed, low-power disable mode that is activated by driving the amplifiers' DISABLE input low. In the disable mode, the
15
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
amplifiers achieve very high isolation from input to output (65dB at 10MHz), and the outputs are placed into a highimpedance state. These amplifiers achieve low switching-transient glitches (<45mVp-p) when switching between enable and disable modes. Fast enable/disable times (120ns/35ns), along with high off-isolation and low switching transients, allow these devices to be used as high-performance, high-speed multiplexers. This is achieved by connecting the outputs of multiple amplifiers together and controlling the DISABLE inputs to enable one amplifier and disable all others. The disabled amplifiers present a very light load (1A leakage current and 3.5pF capacitance) to the active amplifier's output. The feedback network impedance of all the disabled amplifiers must still be considered when calculating the total load on the active amplifier output. Figure 1 shows an application circuit using the MAX4188 as a 3:1 video multiplexer. The DISABLE_ logic threshold is typically VCC - 2.5V, independent of VEE. For a single +5V supply or dual 5V supplies, the disable inputs are CMOS-logic compatible. The amplifiers default to the enabled mode if the DISABLE pin is left unconnected. If the DISABLE pin is left floating, take proper care to ensure that no high-frequency signals are coupled to this pin, as this may cause false triggering.
+5V -5V
1.0F
0.1F 4
0.1F 11
1.0F
560
6 AMP1 7 5
560
VIN1 75
87
MAX4188
560
13 AMP2 14 12
560
75 CABLE
VOUT
VIN2 75
87 75
560
9 10 AMP3 8
560
VIN3 75
87
Applications Information
Theory of Operation
The MAX4188/MAX4189/MAX4190 are current-feedback amplifiers, and their open-loop transfer function is expressed as a transimpedance, VOUT/IIN, or TZ. The frequency behavior of the open-loop transimpedance is similar to the open-loop gain of a voltage-mode feedback amplifier. That is, it has a large DC value and decreases at approximately 6dB per octave. Analyzing the follower with gain, as shown in Figure 2, yields the following transfer function: VOUT / VIN = G x [(TZ (S) / TZ(s) + G x (RIN + RF)] where G = AVCL = 1 + (RF / RG), and RIN = 1/gM 300. At low gains, G x RIN < RF. Therefore, the closed-loop bandwidth is essentially independent of closed-loop gain. Similarly TZ > RF at low frequencies, so that: VOUT = G = 1 + (RF / RG ) VIN
VIN
1 DISABLE1 DISABLE2 DISABLE3
2
3
Figure 1. High-Speed 3:1 Video Multiplexer
RG
RF
RIN +1 +1 TZ VOUT
MAX4188 MAX4189 MAX4190
Figure 2. Current-Feedback Amplifier
16
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable
Layout and Power-Supply Bypassing
As with all wideband amplifiers, a carefully laid out printed circuit board and adequate power-supply bypassing are essential to realizing the optimum AC performance of MAX4188/MAX4189/MAX4190. The PC board should have at least two layers. Signal and power should be on one layer. A large low-impedance ground plane, as free of voids as possible, should be the other layer. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces. Do not use wire-wrap boards or breadboards and sockets. Wire-wrap boards are too inductive. Breadboards and sockets are too capacitive. Surfacemount components have lower parasitic inductance and capacitance, and are therefore preferable to through-hole components. Keep lines as short as possible to minimize parasitic inductance, and avoid 90 turns. Round all corners. Terminate all unused amplifier inputs to ground with a 100 or 150 resistor. The MAX4188/MAX4189/MAX4190 achieve a high degree of off-isolation (65dB at 10MHz) and low crosstalk (-55dB at 10MHz). The input and output signal traces must be kept from overlapping to achieve high off-isolation. Coupling between the signal traces of different channels will degrade crosstalk. The signal traces of each channel should be kept from overlapping with the signal traces of the other channels.
MAX4188/MAX4189/MAX4190
Adequate bypass capacitance at each supply is very important to optimize the high-frequency performance of these amplifiers. Inadequate bypassing will also degrade crosstalk rejection, especially with heavier loads. Use a 1F capacitor in parallel with a 0.01F to 0.1F capacitor between each supply pin and ground to achieve optimum performance. The bypass capacitors should be located as close to the device as possible. A 10F low-ESR tantalum capacitor may be required to produce the best settling time and lowest distortion when large transient currents must be delivered to a load.
Choosing Feedback and Gain Resistors
The optimum value of the external-feedback (RF) and gain-setting (RG) resistors used with the MAX4188/ MAX4189/MAX4190 depends on the closed-loop gain and the application circuit's load. Table 1 lists the optimum resistor values for some specific gain configurations. One-percent resistor values are preferred to maintain consistency over a wide range of production lots. Figures 3a and 3b show the standard inverting and noninverting configurations. Note that the noninverting circuit gain (Figure 3b) is 1 plus the magnitude of the inverting closed-loop gain. Otherwise, the two circuits are identical.
VIN RS RT RG RF VOUT RO VIN
RG
RF VOUT
RS
RO
MAX4188 MAX4189 MAX4190
VOUT = -(RF / RG) (VIN) VOUT = [1+ (RF / RG)] VIN
RT
MAX4188 MAX4189 MAX4190
Figure 3a. Inverting Gain Configuration
Figure 3b. Noninverting Gain Configuration
______________________________________________________________________________________
17
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
Table 1a. MAX4188 Recommended Component Values
DUAL SUPPLIES COMPONENT/ BW COMPONENT/ BW RF () RG () -3dB BW (MHz) AV = +2V/V RL = 1k 910 910 200 RL = 150 560 560 160 RL = 100 390 390 145 AV = +5 (V/V) RL = 1k 470 120 70 AV = +10 (V/V) RL = 1k 470 51 30 RL = 1k 1.1k 1.1k 185 SINGLE SUPPLY AV = +2V/V RL = 150 620 620 145 RL = 100 430 430 130 AV = +5 V/V RL = 1k 470 120 70 AV = +10 V/V RL = 1k 470 51 30
Table 1b. MAX4189 Recommended Component Values
DUAL SUPPLIES COMPONENT/ BW RL = 1k RG () -3dB BW (MHz) 1.6k 250 AV = +1V/V RL = 150 1.1k 210 RL = 100 680 185 RL = 1k 1.5k 230 SINGLE SUPPLY AV = +1V/V RL = 150 1.6k 190 RL = 100 910 165
Table 1c. MAX4190 Recommended Component Values
DUAL SUPPLIES COMPONENT/ BW COMPONENT/ BW RF () RG () -3dB BW (MHz) AV = +2V/V RL = 1k 1.3k 1.3k 185 RL = 150 680 680 180 RL = 100 510 510 135 AV = +5 (V/V) RL = 1k 470 120 70 AV = +10 (V/V) RL = 1k 470 51 30 RL = 1k 1.5k 1.5k 165 SINGLE SUPPLY AV = +1V/V RL = 150 750 750 135 RL = 100 510 510 125 AV = +5 V/V RL = 1k 470 120 70 AV = +10 V/V RL = 1k 470 51 30
DC and Noise Errors
Several major error sources must be considered in any op amp. These apply equally to the MAX4188/ MAX4189/MAX4190. Offset-error terms are given by the equation below. Voltage and current-noise errors are root-square summed and are therefore computed separately. In Figure 4, the total output offset voltage is determined by the following factors: * The input offset voltage (VOS) times the closed-loop gain (1 = RF / RG). * The positive input bias current (I B+ ) times the source resistor (RS) (usually 50 or 75), plus the negative input bias current (IB-) times the parallel combination of R G and R F . In current-feedback amplifiers, the input bias currents at the IN+ and INterminals do not track each other and may have opposite polarity, so there is no benefit to matching the resistance at both inputs.
18
The equation for the total DC error at the output is: VOUT =
[(I
B + RS + IB - RF
)
( )(
||
R RG + VOS 1 + F RG
)
]
RG IBIB+ RS
RF
VOUT
MAX4188 MAX4189 MAX4190
Figure 4. Output Offset Voltage
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
The total output-referred noise voltage is: R en(OUT) = 1 + F x RG With a 200MHz system bandwidth, this calculates to 68VRMS (approximately 408Vp-p, choosing the sixsigma value).
[(in + )RS ] + [(in - )RF ||
2
RG
] + (en )
2
Video Line Driver
2
The MAX4188/MAX4189/MAX4190 have a very low, 2nV/Hz noise voltage. The current noise at the positive input (in+) is 4pA/Hz, and the current noise at the inverting input is 5pA/Hz. An example of the DC error calculations, using the MAX4188 typical data and typical operating circuit where R F = R G = 560k (R F || R G =280), and RS = 37.5, gives the following:
1 x 10 -6 x 37.5 + 2 x 10 -6 280 x 1+ 1 VOUT = + 1.5 x 10 -3 VOUT = 4.1mV
The MAX4188/MAX4189/MAX4190 are well suited to drive coaxial transmission lines when the cable is terminated at both ends (Figure 5). Cable frequency response can cause variations in the signal's flatness. See Table 1 for optimum RF and RG values.
Driving Capacitive Loads
The MAX4188/MAX4189/MAX4190 are optimized for AC performance. Reactive loads decrease phase margin and may produce excessive ringing and oscillation. Unlike most high-speed amplifiers, the MAX4188/ MAX4189/MAX4190 are tolerant of capacitive loads up to 50pF. Capacitive loads greater than 50pF may cause ringing and oscillation. Figure 6a shows a circuit that eliminates this problem. Placing the small (usually 15 to 33) isolation resistor, RS, before the reactive load prevents ringing and oscillation. At higher capacitive loads, the interaction of the load capacitance and isolation resistor controls AC performance. Figures 6b and 6c show the MAX4188 and MAX4189 frequency response with a 100pF capacitive load. Note that in each case, gain peaking is substantially reduced when the 20 resistor is used to isolate the capacitive load from the amplifier output.
()
Calculating the total output noise in a similar manner yields: 4 x 10 -12 x 37.5 + 5 x 10 -12 x 280 + 2 x 10 -9
2 2 2
en(OUT) = 1 + 1
()
en(OUT) = 4.8nV / Hz
RG 560
RF 560 +5V 0.1F RG 75 75 CABLE VIDEO OUT VIN CL RL RF RS
MAX4188 MAX4189 MAX4190
75 CABLE VIDEO IN
MAX4188
75
75
0.1F -5V
Figure 5. Video Line Driver Application
Figure 6a. Using an Isolation Resistor (RS) for High Capacitive Loads
19
______________________________________________________________________________________
Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188/MAX4189/MAX4190
12 10 8 6 GAIN (dB) 4 2 0 -2 -4 -8 -10 1 10 100 1000 FREQUENCY (MHz) RS = 20 RS = 33 MAX4188/MAX4190 AV = +2V/V RF = RG = 910 RL = 1k || 100pF VIN = 20mVp-p 5 4 3 RS = 0 GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 1 10 100 1000 FREQUENCY (MHz) RS = 33 MAX4189 AV = +1V/V RF = 1.6k RL = 1k || 100pF VIN = 20mVp-p
RS = 0
RS = 20
Figure 6b. Normalized Frequency Response with 100pF Capacitive Load
Figure 6c. Normalized Frequency Response with 100pF Capacitive Load
Chip Information
MAX4188/4189 TRANSISTOR COUNT: 336 MAX4190 TRANSISTOR COUNT: 112 SUBSTRATE CONNECTED TO VEE
Ordering Information (continued)
PART MAX4189ESD MAX4189EEE MAX4190ESD MAX4190EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 14 SO 16 QSOP 8 SO 8 MAX
Pin Configurations
TOP VIEW
DISABLE1 1 DISABLE1 1 N.C. ININ+ VEE 1 2 3 4 8 DISABLE VCC OUT N.C. DISABLE2 DISABLE3 2 3 14 OUT2 13 IN212 IN2+ DISABLE2 2 DISABLE3 3 VCC 4 IN1+ 5 IN1- 6 OUT1 7 N.C. 8 16 OUT2 15 IN214 IN2+
MAX4190
7 6 5
VCC 4 IN1+ 5 IN1- 6 OUT1 7
MAX4188 MAX4189
11 VEE 10 IN3+ 9 8 IN3OUT3
MAX4188 MAX4189
13 VEE 12 IN3+ 11 IN310 OUT3 9 N.C.
SO/MAX
SO
QSOP
20
______________________________________________________________________________________

▲Up To Search▲

Price & Availability of MAX4188

	To Download MAX4188 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .