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LT6233/LT6233-10/ LT6234/LT6235 60MHz, Rail-to-Rail Output, 1.9nV/Hz, 1.15mA Op Amp Family
FEATURES
s s s s
DESCRIPTIO
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Low Noise Voltage: 1.9nV/Hz Low Supply Current: 1.15mA/Amp Max Low Offset Voltage: 350V Max Gain Bandwidth Product: LT6233: 60MHz; AV 1 LT6233-10: 375MHz; AV 10 Wide Supply Range: 3V to 12.6V Output Swings Rail-to-Rail Common Mode Rejection Ratio 115dB Typ Output Current: 30mA Operating Temperature Range - 40C to 85C LT6233 Shutdown to 10A Maximum LT6233/LT6233-10 in SOT-23 Package Dual LT6234 in Tiny DFN Package
The LT(R)6233/LT6234/LT6235 are single/dual/quad low noise, rail-to-rail output unity gain stable op amps that feature 1.9nV/Hz noise voltage and draw only 1.15mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 60MHz gain bandwidth product, a 17V/s slew rate and are optimized for low supply voltage signal conditioning systems. The LT6233-10 is a single amplifier optimized for higher gain applications resulting in higher gain bandwidth and slew rate. The LT6233 and LT6233-10 include an enable pin that can be used to reduce the supply current to less than 10A. The amplifier family has an output that swings within 50mV of either supply rail to maximize the signal dynamic range in low supply applications and is specified on 3.3V, 5V and 5V supplies. The en * ISUPPLY product of 2.1 per amplifier is among the most noise efficient of any op amp. The LT6233/LT6233-10 is available in the 6-lead SOT-23 package and the LT6234 dual is available in the 8-pin SO package with standard pinouts. For compact layouts, the dual is also available in a tiny dual fine pitch leadless package (DFN). The LT6235 is available in the 16-pin SSOP package.
APPLICATIO S
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Ultrasound Amplifiers Low Noise, Low Power Signal Processing Active Filters Driving A/D Converters Rail-to-Rail Buffer Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VS+ IN+ 1/2 LT6234 R2 475 R1 49.9 R4 499
Low Noise Low Power Instrumentation Amplifier
R6 499
NOISE VOLTAGE (nV/Hz)
6 5
Noise Voltage and Unbalanced Noise Current vs Frequency
6 VS = 2.5V TA = 25C VCM = 0V 5 4 3 NOISE VOLTAGE 2 1 NOISE CURRENT 0 10 100 1k 10k FREQUENCY (Hz) 0 100k
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VS+
+
LT6233 VOUT EN R7 VS- 499 IS = 3mA EN = 8VRMS INPUT REFERRED, MEASUREMENT BW = 4MHz
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4 3 2 1
-
R3 475 1/2 LT6234 IN- VS- AV = 20 BW = 2.8MHz VS = 1.5V to 5V R5 499
U
UNBALANCED NOISE CURRENT (pA/Hz)
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U
U
1
LT6233/LT6233-10/ LT6234/LT6235
ABSOLUTE
AXI U RATI GS (Note 1)
Junction Temperature ........................................... 150C Junction Temperature (DD Package) ................... 125C Storage Temperature Range ..................-65C to 150C Storage Temperature Range (DD Package) ...................................... - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
Total Supply Voltage (V+ to V-) ............................ 12.6V Input Current (Note 2) ........................................ 40mA Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 4) ...-40C to 85C Specified Temperature Range (Note 5) ....-40C to 85C
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW OUT 1 V2 +IN 3
-
6 V+ 5 ENABLE 4 -IN
LT6233CS6 LT6233IS6 LT6233CS6-10 LT6233IS6-10 S6 PART MARKING* LTAFL LTAFM ORDER PART NUMBER
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 250C/W
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4
- + - +
- +
8 7 6 5
+IN A 3 V
+
OUT B -IN B +IN B
4 B C-
+ - +
+IN B 5
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 190C/W
S8 PART MARKING 6234 6234I
-IN B 6 OUT B 7 NC 8
GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150C, JA = 135C/W
*The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
+
V+
A
D
-
LT6234CS8 LT6234IS8
U
U
W
WW U
W
TOP VIEW OUT A -IN A +IN A V- 1 2 3 4
- +
ORDER PART NUMBER
8 7
- +
V+ OUT B -IN B +IN B
LT6234CDD LT6234IDD
6 5
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 160C/W UNDERSIDE METAL CONNECTED TO V- (PCB CONNECTION OPTIONAL)
DD PART MARKING* LAET ORDER PART NUMBER LT6235CGN LT6235IGN GN PART MARKING 6235 6235I
TOP VIEW OUT A 1 -IN A 2 16 OUT D
15 -IN D 14 +IN D 13 V
-
12 +IN C 11 -IN C 10 OUT C 9 NC
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LT6233/LT6233-10/ LT6234/LT6235
ELECTRICAL CHARACTERISTICS
ENABLE = 0V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage
TA = 25C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD MIN TYP 100 50 75 80 1.5 0.04 0.04 0.1Hz to 10Hz f = 10kHz, VS = 5V f = 10kHz, VS = 5V, RS = 10k f = 10kHz, VS = 5V, RS = 10k Common Mode Differential Mode Common Mode Differential Mode VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 RL = 1k to VS/2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 RL = 1k to VS/2 73 18 53 11 1.5 1.15 90 85 90 90 95 3 No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA VS = 5V VS = 3.3V ENABLE = V+ - 0.35V 40 35 4 75 165 125 5 85 220 165 55 50 1.05 0.2 1.15 10 40 180 320 240 50 195 410 310 115 110 115 115 115 220 1.9 0.43 0.78 22 25 2.5 4.2 140 35 100 20 4 2.65 3 MAX 500 350 450 450 3 0.3 0.3 UNITS V V V V A A A nVP-P nV/Hz pA/Hz pA/Hz M k pF pF V/mV V/mV V/mV V/mV V V dB dB dB dB dB V mV mV mV mV mV mV mV mV mA mA mA A
Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB IOS en in Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density, Balanced Source Unbalanced Source Input Resistance CIN AVOL Input Capacitance Large-Signal Gain
VCM CMRR
Input Voltage Range Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 6)
Guaranteed by CMRR, VS = 5V, 0V VS = 3.3V, 0V VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V VS = 5V, VCM = 1.5V to 4V VS = 3V to 10V VS = 3V to 10V
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6) Minimum Supply Voltage (Note 7)
VOL
Output Voltage Swing LOW (Note 8)
VOH
Output Voltage Swing HIGH (Note 8)
ISC IS
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier
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LT6233/LT6233-10/ LT6234/LT6235
ELECTRICAL CHARACTERISTICS
ENABLE = 0V, unless otherwise noted.
SYMBOL IENABLE VL VH tON tOFF GBW SR PARAMETER ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Gain Bandwidth Product Slew Rate ENABLE = V+ - 0.35V, V
O = 1.5V to 3.5V
TA = 25C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
MIN TYP -25 V+ - 0.35 0.2 500 76 55 320 10 15 80 1.06 1.6 2.2 175 10 MAX -75 0.3 UNITS A V V A ns s MHz MHz V/s V/s MHz MHz ns
CONDITIONS ENABLE = 0.3V
ENABLE = 5V to 0V, RL = 1k, VS = 5V ENABLE = 0V to 5V, RL = 1k, VS = 5V Frequency = 1MHz, VS = 5V LT6233-10 VS = 5V, AV = -1, RL = 1k, VO = 0.5V to 4.5V LT6233-10, VS = 5V, AV = -10, RL = 1k, VO = 0.5V to 4.5V
FPBW tS
Full Power Bandwidth Settling Time (LT6233, LT6234, LT6235)
VS = 5V, VOUT = 3VP-P (Note 9) LT6233-10, HD2 = HD3 1% 0.1%, VS = 5V, VSTEP = 2V, AV = -1, RL = 1k
The q denotes the specifications which apply over 0C < TA < 70C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
q q q q
MIN
TYP
MAX 600 450 550 500
UNITS V V V V V/C A A A V/mV V/mV V/mV V/mV
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB IOS AVOL Input Offset Voltage Drift (Note 10) Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Large-Signal Gain VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2 RL = 1k to VS /2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS /2 RL = 1k to VS /2 VCM CMRR Input Voltage Range Common Mode Rejection Ratio Guaranteed by CMRR, VS = 5V, 0V VS = 3.3V, 0V VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V VS = 3V to 10V VS = 3V to 10V No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA VCM = Half Supply
q q q q q q q q q q q q q q q q q q q q
0.5
3.0 3.5 0.4 0.4
47 12 40 7.5 1.5 1.15 90 85 90 90 95 3 50 195 360 265 4 2.65
V V dB dB dB dB dB V mV mV mV mV
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6) Minimum Supply Voltage (Note 7) VOL Output Voltage Swing LOW (Note 8)
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LT6233/LT6233-10/ LT6234/LT6235
The q denotes the specifications which apply over 0C < TA < 70C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL VOH PARAMETER Output Voltage Swing HIGH (Note 8) CONDITIONS No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA VS = 5V VS = 3.3V ENABLE = V+ - 0.25V ENABLE = 0.3V
q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX 60 205 435 330
UNITS mV mV mV mV mA mA
ISC IS IENABLE VL VH tON tOFF SR
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Slew Rate
35 30 1.39 1 -85 0.3 V+ - 0.25 1 500 120 9 75 955
mA A A V V A ns s V/s V/s kHz
ENABLE = V+ - 0.25V, VO = 1.5V to 3.5V ENABLE = 5V to 0V, RL = 1k, VS = 5V ENABLE = 0V to 5V, RL = 1k, VS = 5V VS = 5V, AV = -1, RL = 1k, VO = 0.5V to 4.5V LT6233-10, AV = -10, RL = 1k, VO = 0.5V to 4.5V
q q q q q q
FPBW
Full Power Bandwidth (Note 9)
LT6233, VS = 5V, VOUT = 3VP-P
The q denotes the specifications which apply over - 40C < TA < 85C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
q q q q
MIN
TYP
MAX 700 550 650 550
UNITS V V V V V/C A A A V/mV V/mV V/mV V/mV
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB IOS AVOL Input Offset Voltage Drift (Note 10) Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Large-Signal Gain VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2 RL = 1k to VS /2 VCM = Half Supply
q q q q q q
0.5
3 4 0.4 0.5
45 11 38 7 1.5 1.15 90 85 90 90 4 2.65
VS = 3.3V, VO = 0.65V to 2.65V,RL = 10k to VS /2 q RL = 1k to VS /2 q VCM CMRR Input Voltage Range Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 6) PSRR Power Supply Rejection Ratio Guaranteed by CMRR, VS = 5V, 0V VS = 3.3V, 0V VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V VS = 5V, VCM = 1.5V to 4V VS = 3V to 10V
q q q q q q
V V dB dB dB dB
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LT6233/LT6233-10/ LT6234/LT6235
The q denotes the specifications which apply over - 40C < TA < 85C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL PARAMETER PSRR Match (Channel-to-Channel) (Note 6) Minimum Supply Voltage (Note 7) VOL Output Voltage Swing LOW (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA VS = 5V VS = 3.3V ENABLE = V+ - 0.2V ENABLE = 0.3V CONDITIONS VS = 3V to 10V
q q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN 95 3
TYP
MAX
UNITS dB V
50 195 370 275 60 210 445 335 30 20 1.46 1 -100 0.3 V+ - 0.2V 1 500 135 8 70 848
mV mV mV mV mV mV mV mV mA mA mA A A V V A ns s V/s V/s kHz
VOH
Output Voltage Swing HIGH (Note 6)
ISC IS IENABLE VL VH tON tOFF SR
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Slew Rate
ENABLE = V+ - 0.2V, VO = 1.5V to 3.5V ENABLE = 5V to 0V, RL = 1k, VS = 5V ENABLE = 0V to 5V, RL = 1k, VS = 5V VS = 5V, AV = -1, RL = 1k, VO = 0.5V to 4.5V LT6233-10, AV = -10, RL = 1k, VO = 0.5V to 4.5V
q q q q q q
FPBW
Full Power Bandwidth (Note 9)
LT6233, VS = 5V, VOUT = 3VP-P
TA = 25C, VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD MIN TYP 100 50 75 100 1.5 0.04 0.04 0.1Hz to 10Hz f = 10kHz f = 10kHz, RS = 10k f = 10kHz, RS = 10k 220 1.9 0.43 0.78 3.0 MAX 500 350 450 450 3 0.3 0.3 UNITS V V V V A A A nVP-P nV/Hz pA/Hz pA/Hz
Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB IOS en in Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density, Balanced Source Unbalanced Source
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LT6233/LT6233-10/ LT6234/LT6235
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Resistance CIN AVOL VCM CMRR PSRR VOL Input Capacitance Large-Signal Gain Input Voltage Range Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 6) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6) Output Voltage Swing LOW (Note 8)
TA = 25C, VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
CONDITIONS Common Mode Differential Mode Common Mode Differential Mode VO = 4.5V, RL = 10k RL = 1k Guaranteed by CMRR VCM = -3V to 4V VCM = -3V to 4V VS = 1.5V to 5V VS = 1.5V to 5V No Load ISINK = 5mA ISINK = 15mA No Load ISOURCE = 5mA ISOURCE = 15mA 40 ENABLE = 4.65V ENABLE = 0.3V 4.65 ENABLE = 4.65V, VO = 1V ENABLE = 5V to 0V, RL = 1k ENABLE = 0V to 5V, RL = 1k Frequency = 1MHz LT6233-10 AV = -1, RL = 1k, VO = -2V to 2V LT6233-10, AV = -10, RL = 1k, VO = -2V to 2V FPBW tS Full Power Bandwidth Settling Time (LT6233, LT6234, LT6235) VOUT = 3VP-P (Note 9) LT6233-10, HD2 = HD3 1% 0.1%, VSTEP = 2V, AV = -1, RL = 1k 1.27 42 260 12 0.2 900 100 60 375 17 115 1.8 2.2 170 10 97 28 -3 90 95 90 95 110 120 115 115 4 75 165 5 85 220 55 1.15 0.2 -35 1.25 10 -85 0.3 40 180 320 50 195 410 MIN TYP 22 25 2.1 3.7 180 55 4 MAX UNITS M k pF pF V/mV V/mV V dB dB dB dB mV mV mV mV mV mV mA mA A A V V A ns s MHz MHz V/s V/s MHz MHz ns
VOH
Output Voltage Swing HIGH (Note 8)
ISC IS IENABLE VL VH tON tOFF GBW SR
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Gain Bandwidth Product Slew Rate
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LT6233/LT6233-10/ LT6234/LT6235
The q denotes the specifications which apply over 0C < TA < 70C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX 600 450 550 500
UNITS V V V V V/C A A A V/mV V/mV
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB IOS AVOL VCM CMRR PSRR VOL Input Offset Voltage Drift (Note 10) Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Large-Signal Gain Input Voltage Range Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 6) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6) Output Voltage Swing LOW (Note 8) VO = 4.5V,RL = 10k RL = 1k Guaranteed by CMRR VCM = -3V to 4V VCM = -3V to 4V VS = 1.5V to 5V VS = 1.5V to 5V No Load ISINK = 5mA ISINK = 15mA No Load ISOURCE = 5mA ISOURCE = 15mA
0.5
3 3.5 0.4 0.4
q q q q q q q q q q q q q q
75 22 -3 90 95 90 95 50 195 360 60 205 435 35 1.53 1 -95 0.3 4.75 1 900 150 11 105 1.16 4
V dB dB dB dB mV mV mV mV mV mV mA mA A A V V A ns s V/s V/s MHz
VOH
Output Voltage Swing HIGH (Note 8)
ISC IS IENABLE VL VH tON tOFF SR
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Slew Rate ENABLE = 4.75V, VO = 1V ENABLE = 5V to 0V, RL = 1k ENABLE = 0V to 5V, RL = 1k AV = -1, RL = 1k, VO = -2V to 2V LT6233-10, AV = -10, RL = 1k, VO = -2V to 2V ENABLE = 4.75V ENABLE = 0.3V
q q q q q q q q q q q
FPBW
Full Power Bandwidth (Note 9)
LT6233, VOUT = 3VP-P
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LT6233/LT6233-10/ LT6234/LT6235
The q denotes the specifications which apply over -40C < TA < 85C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX 700 550 650 550
UNITS V V V V V/C A A A V/mV V/mV
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB IOS AVOL VCM CMRR PSRR VOL Input Offset Voltage Drift (Note 10) Input Bias Current IB Match (Channel-to-Channel) (Note 6) Input Offset Current Large-Signal Gain Input Voltage Range Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 6) Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6) Output Voltage Swing LOW (Note 8) VO = 4.5V,RL = 10k RL = 1k Guaranteed by CMRR VCM = -3V to 4V VCM = -3V to 4V VS = 1.5V to 5V VS = 1.5V to 5V No Load ISINK = 5mA ISINK = 15mA No Load ISOURCE = 5mA ISOURCE = 15mA
0.5
3 4 0.4 0.5
q q q q q q q q q q q q q q
68 20 -3 90 90 90 95 50 195 370 70 210 445 30 1.61 1 -110 0.3 4.8 1 900 160 10 95 1.06 4
V dB dB dB dB mV mV mV mV mV mV mA mA A A V V A ns s V/s V/s MHz
VOH
Output Voltage Swing HIGH (Note 8)
ISC IS IENABLE VL VH tON tOFF SR
Short-Circuit Current Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE Pin Current ENABLE Pin Input Voltage LOW ENABLE Pin Input Voltage HIGH Output Leakage Current Turn-On Time Turn-Off Time Slew Rate ENABLE = 4.8V, VO = 1V ENABLE = 5V to 0V, RL = 1k ENABLE = 0V to 5V, RL = 1k AV = -1, RL = 1k, VO = -2V to 2V LT6233-10, AV = -10, RL = 1k, VO = -2V to 2V ENABLE = 4.8V ENABLE = 0.3V
q q q q q q q q q q q
FPBW
Full Power Bandwidth (Note 9)
LT6233, VOUT = 3VP-P
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LT6233/LT6233-10/ LT6234/LT6235
ELECTRICAL CHARACTERISTICS
Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired. Note 2: Inputs are protected by back-to-back diodes. If the differential input voltage exceeds 0.7V, the input current must be limited to less than 40mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 4: The LT6233C/LT6233I the LT6234C/LT6234I, and LT6235C/ LT6235I are guaranteed functional over the temperature range of -40C and 85C. Note 5: The LT6233C/LT6234C/LT6235C are guaranteed to meet specified performance from 0C to 70C. The LT6233C/LT6234C/LT6235C are designed, characterized and expected to meet specified performance from - 40C to 85C, but are not tested or QA sampled at these temperatures. The LT6233I/LT6234I/LT6235I are guaranteed to meet specified performance from -40C to 85C. Note 6: Matching parameters are the difference between the two amplifiers A and D and between B and C of the LT6235; between the two amplifiers of the LT6234. CMRR and PSRR match are defined as follows: CMRR and PSRR are measured in V/V on the matched amplifiers. The difference is calculated between the matching sides in V/V. The result is converted to dB. Note 7: Minimum supply voltage is guaranteed by power supply rejection ratio test. Note 8: Output voltage swings are measured between the output and power supply rails. Note 9: Full-power bandwidth is calculated from the slew rate: FPBW = SR/2VP Note 10: This parameter is not 100% tested.
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235) VOS Distribution
60 VS = 5V, 0V VCM = V+/2 50 S8
SUPPLY CURRENT (mA)
OFFSET VOLTAGE (V)
NUMBER OF UNITS
40 30 20 10 0 50 100 150 200 -200 -150 -100 -50 0 INPUT OFFSET VOLTAGE (V)
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Input Bias Current vs Common Mode Voltage
6 5
INPUT BIAS CURRENT (A)
VS = 5V, 0V
5
OUTPUT SATURATION VOLTAGE (V)
4 3 TA = -55C 2 1 0 -1 -2 -1 0 4 5 3 2 COMMON MODE VOLTAGE (V) 1 6 TA = 25C TA = 125C
INPUT BIAS CURRENT (A)
10
UW
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Supply Current vs Supply Voltage (Per Amplifier)
2.0 500 400 1.5 TA = 125C TA = 25C 1.0 TA = -55C 0.5 300 200 100 0 -100 -200 -300 -400 0 0 2 10 12 8 6 TOTAL SUPPLY VOLTAGE (V) 4 14 -500
Offset Voltage vs Input Common Mode Voltage
VS = 5V, 0V
TA = -55C TA = 25C TA = 125C 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 INPUT COMMON MODE VOLTAGE (V)
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623345 GO2
Input Bias Current vs Temperature
6 VS = 5V, 0V
Output Saturation Voltage vs Load Current (Output Low)
10 VS = 5V, 0V
1
4 3 2 1 0 -1 -50 VCM = 4V VCM = 1.5V
0.1
TA = 125C TA = -55C
0.01 TA = 25C 0.001
-25
0
50 75 25 TEMPERATURE (C)
100
125
0.0001 0.01
1 10 0.1 LOAD CURRENT (mA)
100
623345 GO6
623345 GO5
623345f
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235) Output Saturation Voltage vs Load Current (Output High)
10
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V
OFFSET VOLTAGE (mV)
1
0.1
TA = 125C TA = -55C
0.01 TA = 25C 0.1 1 10 LOAD CURRENT (mA) 100
623345 G07
0.001 0.01
Open Loop Gain
2.5 2.0 1.5 VS = 3V, 0V TA = 25C 2.5 2.0 1.5
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) 2.5 3.0 RL = 1k RL = 100
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V)
623345 G11
INPUT VOLTAGE (mV)
Offset Voltage vs Output Current
2.0 1.5 TA = 125C
OFFSET VOLTAGE (mV)
VS = 5V
CHANGE IN OFFSET VOLTAGE (V)
30 25 VS = 2.5V 20 15 10 0
0.5 0 -0.5 -1.0 TA = -55C -1.5 -2.0 -90 -60 TA = 25C -30 0 30 60 90
TOTAL NOISE (nV/Hz)
1.0
OUTPUT CURRENT (mA)
623345 G13
UW
623345 G10
Minimum Supply Voltage
1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 TA = 125C 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 TOTAL SUPPLY VOLTAGE (V)
623345 G08
Output Short Circuit Current vs Power Supply Voltage
80 60 40 20 0 -20 -40 -60 TA = 25C -80 1.5 2.0 3.0 3.5 4.0 4.5 POWER SUPPLY VOLTAGE (V) 2.5 5.0 TA = -55C TA = 125C TA = 25C
VCM = VS/2
SINKING
TA = -55C TA = 25C
SOURCING
TA = 125C TA = -55C
623345 GO9
Open Loop Gain
VS = 5V, 0V TA = 25C 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5
Open Loop Gain
VS = 5V TA = 25C
RL = 1k RL = 100
RL = 1k RL = 100
-5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
4
5
623345 G12
Warm-Up Drift vs Time
40 35 TA = 25C VS = 5V
Total Noise vs Total Source Resistance
100 VS = 2.5V VCM = 0V f = 100kHz UNBALANCED SOURCE 10 RESISTORS TOTAL NOISE
RESISTOR NOISE AMPLIFIER NOISE VOLTAGE
1
VS = 1.5V
0.1
0 10 30 40 20 TIME AFTER POWER-UP (s) 50
623345 G14
10
100 1k 10k TOTAL SOURCE RESISTANCE ()
100k
623345 G15
623345f
11
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235) Noise Voltage and Unbalanced Noise Current vs Frequency
6 5 6 VS = 2.5V TA = 25C VCM = 0V 5 4 3 NOISE VOLTAGE 2 1 NOISE CURRENT 0 10 100 1k 10k FREQUENCY (Hz) 0 100k
623345 G16
NOISE VOLTAGE (nV/Hz)
GAIN BANDWIDTH (MHz)
4 3 2 1
100nV/DIV
Open Loop Gain vs Frequency
80 70 60 50 GAIN (dB) 40 30 20 10 0 -10 -20 100k 1M 10M 100M FREQUENCY (Hz) 1G
623345 G19
PHASE
GAIN BANDWIDTH (MHz)
VS = 3V, 0V
40 20
PHASE MARGIN 70 60 50 40 30 0 2 10 12 8 6 TOTAL SUPPLY VOLTAGE (V) 4 14 GAIN BANDWIDTH
50 40
SLEW RATE (V/s)
VS = 5V
VS = 3V, 0V GAIN
VS = 5V
Output Impedance vs Frequency
1k
COMMON MODE REJECTION RATIO (dB)
VS = 5V, 0V
OUTPUT IMPEDANCE ()
100
AV = 10
CHANNEL SEPARATION (dB)
10 AV = 1 1
AV = 2
0.1 100k
1M 10M FREQUENCY (Hz)
12
UW
623345 G22
0.1Hz to 10Hz Output Voltage Noise
VS = 2.5V
Gain Bandwidth and Phase Margin vs Temperature
70 VS = 5V 60 50 90 VS = 3V, 0V PHASE MARGIN 40
120 CL = 5pF RL = 1k 100 VCM = VS/2 80 60 PHASE (DEG)
UNBALANCED NOISE CURRENT (pA/Hz)
PHASE MARGIN (DEG)
100nV
-100nV
CL = 5pF 80 RL = 1k VCM = VS/2 70 60 50 VS = 5V VS = 3V, 0V -25 65 35 5 TEMPERATURE (C) 95 125 GAIN BANDWIDTH
5s/DIV
623345 G17
40 -55
623345 G18
Gain Bandwidth and Phase Margin vs Supply Voltage
TA = 25C CL = 5pF RL = 1k 80 70 60 26
Slew Rate vs Temperature
AV = -1 24 RF = RG = 1k 22 20 18 16 14 12 10 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C)
623345 G21
VS = 5V RISING
VS = 5V FALLING
PHASE MARGIN (DEG)
0 -20 -40 -60 -80
VS = 2.5V FALLING VS = 2.5V RISING
623345 G20
Common Mode Rejection Ratio vs Frequency
120 100 80 60 40 20 0 10k VS = 5V, 0V VCM = VS/2 100k 1M 10M FREQUENCY (Hz) 100M 1G
Channel Separation vs Frequency
-40 AV = 1 -50 TA = 25C VS = 5V -60 -70 -80 -90 -100 -110 -120 -130 -140 100k 1M 10M FREQUENCY (Hz) 100M
623345 G24
100M
623345 G23
623345f
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235) Power Supply Rejection Ratio vs Frequency
120
POWER SUPPLY REJECTION RATIO (dB)
100 80 60 40 20 0 1k 10k 1M 100k FREQUENCY (Hz) NEGATIVE SUPPLY
OVERSHOOT (%)
OVERSHOOT (%)
POSITIVE SUPPLY
Settling Time vs Output Step (Non-Inverting)
400 VS = 5V TA = 25C 350 AV = 1 400 350
500 VIN
-
SETTLING TIME (ns)
VOUT VIN
-
VOUT
OUTPUT VOLTAGE SWING (VP-P)
SETTLING TIME (ns)
300 250 200 150 100 50 10mV 1mV 1mV
+
500
-4
-3
-2
1 2 0 OUTPUT STEP (V)
-1
Distortion vs Frequency
-40 VS = 2.5V AV = 1 -50 VOUT = 2V(P-P)
DISTORTION (dBc) DISTORTION (dBc)
-40
-60 -70 -80
RL = 1k, 3RD
-60 -70 -80 -90
RL = 100, 2ND RL = 100, 3RD RL = 1k, 3RD
DISTORTION (dBc)
RL = 100, 2ND RL = 100, 3RD
RL = 1k, 2ND -90 -100 10k
100k 1M FREQUENCY (Hz)
UW
VS = 5V, 0V TA = 25C VCM = VS/2 10M
623345 G25
Series Output Resistance and Overshoot vs Capacitive Load
50 VS = 5V, 0V 45 AV = 1 40 35 30 25 20 15 10 5 0 RS = 50 RL = 50 RS = 20 RS = 10 50
Series Output Resistance and Overshoot vs Capacitive Load
VS = 5V, 0V 45 AV = 2 40 35 30 25 20 15 10 5 0 RS = 50 RL = 50 RS = 20 RS = 10
100M
10
100 CAPACITIVE LOAD (pF)
1000
623345 G26
10
100 CAPACITIVE LOAD (pF)
1000
623345 G27
Settling Time vs Output Step (Inverting)
500
Maximum Undistorted Output Signal vs Frequency
10 9 8 7 6 5 4 V = 5V 3 T S = 25C A HD2, HD3 < -40dBc 2 100k 1M 10k FREQUENCY (Hz) AV = -1 AV = 2
VS = 5V TA = 25C AV = -1
300 250 200 150 100 50
+
1mV 10mV 1mV 10mV
10mV
3
4
-4
-3
-2
-1 1 2 0 OUTPUT STEP (V)
3
4
10M
623345 G30
623345 G28
623345 G29
Distortion vs Frequency
VS = 5V AV = 1 -50 VOUT = 2V(P-P) -30
Distortion vs Frequency
VS = 2.5V A =2 -40 VV = 2V (P-P) OUT -50 -60 -70 -80 -90 -100 10k RL = 1k, 2ND RL = 100, 2ND RL = 100, 3RD RL = 1k, 3RD
RL = 1k, 2ND
10M
623345 G31
-100 10k
100k 1M FREQUENCY (Hz)
10M
623345 G32
100k 1M FREQUENCY (Hz)
10M
623345 G33
623345f
13
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235) Distortion vs Frequency
-30 VS = 5V AV = 2 -40 V OUT = 2V(P-P)
DISTORTION (dBc)
50mV/DIV VS = 2.5V AV = -1 RL = 1k 200ns/DIV
623345 G35
-50 -60 -70 -80
1V/DIV
RL = 100, 2ND RL = 100, 3RD
RL = 1k, 2ND -90 -100 10k
100k 1M FREQUENCY (Hz)
Large Signal Response
5V VIN (1V/DIV) 0V
2V/DIV
0V
VOUT (2V/DIV)
-5V
VS = 5V AV = 1 RL = 1k
(LT6233) ENABLE Characteristics Supply Current vs ENABLE Pin Voltage
1.4 TA = 125C 1.2 1.0 0.8 0.6 0.4 0.2 0 VS = 2.5V -2.0 0 1.0 -1.0 PIN VOLTAGE (V) 2.0
623345 G39
30
ENABLE PIN CURRENT (A)
TA = 25C TA = -55C
ENABLE PIN
SUPPLY CURRENT (mA)
VOUT
14
UW
RL = 1k, 3RD
Large Signal Response
Small Signal Response
2V
0V
0V
-2V
VS = 2.5V AV = 1 RL = 1k
200ns/DIV
623345 G36
10M
623345 G34
Output Overdrive Recovery
0V
200ns/DIV
623345 G37
VS = 2.5V AV = 3
200ns/DIV
623345 G38
ENABLE Pin Current vs ENABLE Pin Voltage
35 TA = -55C VS = 2.5V AV = 1
ENABLE Pin Response Time
5V 0V
25 20
TA = 25C TA = 125C
15 10 5 0
0.5V 0V VS = 2.5V VIN = 0.5V AV = 1 RL = 1k 200s/DIV
-2.0
0 1.0 -1.0 PIN VOLTAGE (V)
2.0
623345 G40
623345 G41
623345f
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233-10) Gain Bandwidth and Phase Margin vs Temperature
450 400 AV = 10 VS = 5V GAIN BANDWIDTH VS = 3V, 0V 200
GAIN BANDWIDTH (MHz)
350 300 250 200 VS = 5V VS = 3V, 0V -50 -25 0
SLEW RATE (V/s)
OVERSHOOT (%)
PHASE MARGIN
75 50 25 TEMPERATURE (C)
Open Loop Gain vs Frequency
80 70 60 50 PHASE VS = 5V GAIN VS = 3V, 0V AV = 10 CL = 5pF 100 RL = 1k VCM = VS/2 80 60 120
GAIN BANDWIDTH (MHz)
GAIN BANDWIDTH (MHz)
GAIN (dB)
40 30 20 10 0
VS = 3V, 0V 40 20 0 -20 VS = 5V -40 -60 -80
-10 -20 100k 1M 10M 100M FREQUENCY (Hz) 1G
623345 G45
Common Mode Rejection Ratio vs Frequency
120
COMMON MODE REJECTION RATIO (dB)
VS = 5V, 0V VCM = VS/2 OUTPUT VOLTAGE SWING (VP-P)
100 80 60 40 20 0 10k
7 6 5 4 3 2 VS = 5V TA = 25C 1 AV = 10 HD2, HD3 40dBc 0 100k 1M 10k FREQUENCY (Hz)
DISTORTION (dBc)
100k
1M 10M FREQUENCY (Hz)
100M
UW
100
623345 G42
Slew Rate vs Temperature
AV = -10 180 RF = 1k RG = 100 160 VS = 5V RISING 140 120 100 80 60 40 20 0 -55 -35 -15 0 5 25 45 65 85 105 125 TEMPERATURE (C)
623345 G43
Series Output Resistance and Overshoot vs Capacitive Load
70 60 50 RS = 20 40 30 20 10 RS = 50 VS = 5V, 0V AV = 10 RS = 10
VS = 5V FALLING
PHASE MARGIN (DEG)
70 60 50 40 125
VS = 2.5V RISING VS = 2.5V FALLING
10
100 1000 CAPACITIVE LOAD (pF)
10000
623345 G44
Gain Bandwidth and Phase Margin vs Supply Voltage
450 TA = 25C AV = 10 375 CL = 5pF RL = 1k 300 225 100 PHASE MARGIN 50 0 GAIN BANDWIDTH
400 350 300 250 200 150 100 50 0
Gain Bandwidth vs Resistor Load
AV = 10 VS 5V TA = 25C RF = 1k RG = 100
PHASE MARGIN (DEG)
PHASE (DEG)
0
2
8 10 6 TOTAL SUPPLY VOLTAGE (V)
4
12
0
200
623345 G46
1000 400 800 600 TOTAL RESISTOR LOAD () (INCLUDES FEEDBACK R) 623345 G47
Maximum Undistorted Output vs Frequency
10 9 8
-50 -60 -70 -80 -90 -30
2nd and 3rd Harmonic Distortion vs Frequency
VS = 2.5V A = 10 -40 VV = 2V (P-P) OUT RL = 100, 3RD RL = 1k, 3RD RL = 100, 2ND RL = 1k, 2ND
1G
10M
623345 G49
-100 10k
100k 1M FREQUENCY (Hz)
10M
623345 G50
623345 G48
623345f
15
LT6233/LT6233-10/ LT6234/LT6235 TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233-10) 2nd and 3rd Harmonic Distortion vs Frequency
-30 VS = 5V A = 10 -40 VV = 2V (P-P) OUT
RL = 1k, 2ND
DISTORTION (dBc)
VOUT (2V/DIV)
RL = 100, 3RD
-60 -70 -80 -90
RL = 100, 2ND RL = 1k, 3RD
0V
VOUT (2V/DIV) VIN (0.5V/DIV) VS = 5V 100ns/DIV AV = 10 RF = 900, RG = 100
623345 G52
-50
-100 10k
100k 1M FREQUENCY (Hz)
Small Signal Response
10
VOUT (100mV/DIV)
2.5V
1nV/Hz/DIV
VS = 5V, 0V 100ns/DIV AV = 10 RF = 900, RG = 100
16
UW
623345 G51
Large Signal Response
Output-Overload Recovery
0V
0V VS = 5V, 0V 100ns/DIV AV = 10 RF = 900, RG = 100
623345 G53
10M
Input Referred High Frequency Noise Spectrum
0 100kHz 2MHz/DIV
623345 G54 623345 G55
20MHz
623345f
LT6233/LT6233-10/ LT6234/LT6235
APPLICATIO S I FOR ATIO
Amplifier Characteristics Figure 1 is a simplified schematic of the LT6233/LT6234/ LT6235, which has a pair of low noise input transistors Q1 and Q2. A simple current mirror Q3/Q4 converts the differential signal to a single-ended output, and these transistors are degenerated to reduce their contribution to the overall noise. Capacitor C1 reduces the unity cross frequency and improves the frequency stability without degrading the gain bandwidth of the amplifier. Capacitor CM sets the overall amplifier gain bandwidth. The differential drive generator supplies current to transistors Q5 and Q6 that swing the output from rail-to-rail.
+V CM Q3 -V DESD1 -VIN D1 +VIN DESD3 -V +V
623345 F01
1V/DIV
Q5
Q4
+V
C1 DESD2 -V Q1 D2 Q2
DIFFERENTIAL DRIVE GENERATOR -V Q6 +V
DESD4
I1
BIAS
Figure 1. Simplified Schematic
Input Protection There are back-to-back diodes, D1 and D2 across the + and - inputs of these amplifiers to limit the differential input voltage to 0.7V. The inputs of the LT6233/LT6234/ LT6235 do not have internal resistors in series with the input transistors. This technique is often used to protect the input devices from over voltage that causes excessive current to flow. The addition of these resistors would significantly degrade the low noise voltage of these amplifiers. For instance, a 100 resistor in series with each input would generate 1.8nV/Hz of noise, and the total amplifier noise voltage would rise from 1.9nV/Hz to 2.6nV/Hz. Once the input differential voltage exceeds 0.7V, steady state current conducted through the protection diodes should be limited to 40mA. This implies 25 of protection resistance is necessary per volt of overdrive beyond 0.7V. These input diodes are rugged enough to
U
2.5V 0V -2.5V 500s/DIV
623345 F02
W
U
U
Figure 2. VS = 2.5V, AV = 1 with Large Overdrive
handle transient currents due to amplifier slew rate overdrive and clipping without protection resistors. The photo of Figure 2 shows the output response to an input overdrive with the amplifier connected as a voltage follower. With the input signal low, current source I1 saturates and the differential drive generator drives Q6 into saturation so the output voltage swings all the way to V-. The input can swing positive until transistor Q2 saturates into current mirror Q3/Q4. When saturation occurs, the output tries to phase invert, but diode D2 conducts current from the signal source to the output through the feedback connection. The output is clamped a diode drop below the input. In this photo, the input signal generator is limiting at about 20mA. With the amplifier connected in a gain of AV 2, the output can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power supply rails. ESD The LT6233/LT6234/LT6235 have reverse-biased ESD protection diodes on all inputs and outputs as shown in Figure 1. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to one hundred milliamps or less, no damage to the device will occur. Noise The noise voltage of the LT6233/LT6234/LT6235 is equivalent to that of a 225 resistor, and for the lowest possible noise it is desirable to keep the source and feedback resistance at or below this value, i.e. RS + RG||RFB 225.
623345f
+V DESD5 VOUT DESD6
ENABLE
-V
17
LT6233/LT6233-10/ LT6234/LT6235
APPLICATIO S I FOR ATIO
eN=(1.9nV)2+(1.9nV)2 = 2.69nV/Hz Below this resistance value, the amplifier dominates the noise, but in the region between 225 and about 30k, the noise is dominated by the resistor thermal noise. As the total resistance is further increased beyond 30k, the amplifier noise current multiplied by the total resistance eventually dominates the noise. The product of eN * ISUPPLY is an interesting way to gauge low noise amplifiers. Most low noise amplifiers with low eN have high ISUPPLY current. In applications that require low noise voltage with the lowest possible supply current, this product can prove to be enlightening. The LT6233/ LT6234/LT6235 have an eN * ISUPPLY product of only 2.1 per amplifier, yet it is common to see amplifiers with similar noise specifications to have eN * ISUPPLY as high as 13.5.
With RS + RG||RFB = 225 the total noise of the amplifier is:
18
U
For a complete discussion of amplifier noise, see the LT1028 data sheet. Enable Pin The LT6233 and LT6233-10 include an ENABLE pin that shuts down the amplifier to 10A maximum supply current. The ENABLE pin must be driven high to within 0.35V of V+ to shut down the supply current. This can be accomplished with simple gate logic; however care must be taken if the logic and the LT6233 operate from different supplies. If this is the case, then open drain logic can be used with a pull-up resistor to ensure that the amplifier remains off. See Typical Characteristic Curves. The output leakage current when disabled is very low; however, current can flow into the input protection diodes D1 and D2 if the output voltage exceeds the input voltage by a diode drop.
623345f
W
U
U
LT6233/LT6233-10/ LT6234/LT6235
APPLICATIO S I FOR ATIO U
Frequency Response Plot of Bandpass Filter
23
Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10
R1 732
C2 47pF V+ f0 = 1 = 1MHz 2RC
C1 1000pF VIN
R2 732
R3 10k
0.1F
-
LT6233 VOUT
+
C3 0.1F R4 10k
EN
f0 = 732 MHz, MAXIMUM f0 = 1MHz R f-3dB = f0 2.5 AV = 20dB at f0 EN = 6VRMS INPUT REFERRED IS = 1.5mA FOR V+ = 5V
(
)
GAIN (dB)
623345 F03
Low Power, Low Noise, Single Supply, Instrumentation Amplifier with Gain = 100
C2 2200pF
R1 30.9
VIN1 C1 1F R6 511
R3 30.9
R5 511 VIN2 C3 1F
W
U
U
C = C1C2, R = R1 = R2
3
-7 100k
1M FREQUENCY (Hz)
10M
623345 F04
R2 V+ 511
-
U1 LT6233-10
C8 68pF R15 88.7 R13 2k R10 511 V+
+
EN
-
U3 LT6233 VOUT
+
V+ 511 R4 R16 88.7 R14 2k R12 511 C4 10F C9 68pF
EN
-
U2 LT6233-10
VOUT = 100 (VIN2 - VIN1) GAIN = R2 + 1 R1
+
EN
(
R10 ) (R15)
R1 = R3 R2 = R4 R10 = R12 R15 = R16
INPUT RESISTANCE = R5 = R6 f-3dB = 310Hz TO 2.5MHz EN = 10VRMS INPUT REFERRED IS = 4.7mA FOR VS = 5V, 0V
623345 F05
623345f
19
LT6233/LT6233-10/ LT6234/LT6235
PACKAGE DESCRIPTIO U
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 - 0.45 6 PLCS (NOTE 3) 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 0.09 - 0.20 (NOTE 3) 1.90 BSC
S6 TSOT-23 0302
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.30 - 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
623345f
20
LT6233/LT6233-10/ LT6234/LT6235
PACKAGE DESCRIPTIO
0.675 0.05
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.28 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK
U
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.38 0.10 8 3.00 0.10 (4 SIDES) 1.65 0.10 (2 SIDES)
(DD8) DFN 0203
0.200 REF
0.75 0.05
4 0.28 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
0.00 - 0.05
BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED
623345f
21
LT6233/LT6233-10/ LT6234/LT6235
PACKAGE DESCRIPTIO
.050 BSC 8
.245 MIN
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
22
U
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.045 .005 .189 - .197 (4.801 - 5.004) NOTE 3 7 6 5 .160 .005 .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 1 2 3 4 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
SO8 0303
623345f
LT6233/LT6233-10/ LT6234/LT6235
PACKAGE DESCRIPTIO U
GN Package 16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.045 .005 .189 - .196* (4.801 - 4.978) 16 15 14 13 12 11 10 9 .009 (0.229) REF .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 TYP 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .016 - .050 (0.406 - 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0 - 8 TYP .053 - .068 (1.351 - 1.727) 23 4 56 7 8 .004 - .0098 (0.102 - 0.249) .008 - .012 (0.203 - 0.305) .0250 (0.635) BSC
GN16 (SSOP) 0502
.254 MIN
RECOMMENDED SOLDER PAD LAYOUT
623345f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT6233/LT6233-10/ LT6234/LT6235
TYPICAL APPLICATIO S
The LT6233 is applied as a transimpedance amplifier with an I-to-V conversion gain of 10k set by R1. The LT6233 is ideally suited to this application because of its low input offset voltage and current, and its low noise. This is because the 10k resistor has an inherent thermal noise of 13nV/Hz or 1.3pA/Hz at room temperature, while the LT6233 contributes only 2nV and 0.8pA /Hz. So, with respect to both voltage and current noises, the LT6233 is actually quieter than the gain resistor. The circuit uses an avalanche photodiode with the cathode biased to approximately 200V. When light is incident on
Low Power Avalanche Photodiode Transimpedance Amplifier IS = 1.2mA
200V BIAS ADVANCED PHOTONIX 012-70-62-541 WWW.ADVANCEDPHOTONIX.COM R1 10k C1 2.7pF
-
R2 10k LT6233
5V
+
ENABLE C2 0.1F
50mV/DIV
OUTPUT OFFSET = 500V TYPICAL BANDWIDTH = 7.8MHz OUTPUT NOISE = 1mVP-P (20MHz MEASUREMENT BW)
RELATED PARTS
PART NUMBER LT1028 LT1677 LT1806/LT1807 LT6200/LT6201 LT6202/LT6203/LT6204 DESCRIPTION Single, Ultra Low Noise 50MHz Op Amp Single, Low Noise Rail-to-Rail Amplifier Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier Single/Dual, Low Noise 165MHz Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier COMMENTS 0.85nV/Hz 3V Operation, 2.5mA, 4.5nV/Hz, 60V Max VOS 2.5V Operation, 550V Max VOS, 3.5nV/Hz 0.95nVHz, Rail-to-Rail Input and Output 1.9nV/Hz, 3mA Max, 100MHz Gain Bandwidth
24
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
the photodiode, it induces a current IPD which flows into the amplifier circuit. The amplifier output falls negative to maintain balance at its inputs. The transfer function is therefore VOUT = -IPD * 10k. C1 ensures stability and good settling characteristics. Output offset was measured at better than 500V, so low in part because R2 serves to cancel the DC effects of bias current. Output noise was measured at below 1mVP-P on a 20MHz measurement bandwidth, with C2 shunting R2's thermal noise. As shown in the scope photo, the rise time is 45ns, indicating a signal bandwidth of 7.8MHz.
Photodiode Amplifier Time Domain Response
-5V
623345 TA02a
100ns/DIV
623345 TA02b
623345f LT/TP 1003 1K * PRINTED IN USA
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(c) LINEAR TECHNOLOGY CORPORATION 2003

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