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19-2016; Rev 0; 5/01
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps
General Description
The MAX4245/MAX4246/MAX4247 family of low-cost op amps offer Rail-to-Rail(R) inputs and outputs, draw only 320A of quiescent current, and operate from a single +2.5V to +5.5V supply. For additional power conservation, the MAX4245/MAX4247 offer a low-power shutdown mode that reduces supply current to 50nA, and puts the amplifiers' outputs in a high-impedance state. These devices are unity-gain stable with a 1MHz gain-bandwidth product driving capacitive loads up to 470pF. The MAX4245/MAX4246/MAX4247 family is specified from -40C to +125C, making them suitable for use in a variety of harsh environments, such as automotive applications. The MAX4245 single amplifier is available in ultra-small 6-pin SC70 and space-saving 6-pin SOT23 packages. The MAX4246 dual amplifier is available in 8-pin SOT23 and MAX packages. The MAX4247 dual amplifier comes in a tiny 10-pin MAX package.
Features
o Rail-to-Rail Input and Output Voltage Swing o 50nA (max) Shutdown Mode (MAX4245/MAX4247) o 320A (typ) Quiescent Current Per Amplifier o Single +2.5V to +5.5V Supply Voltage Range o 110dB Open-Loop Gain with 2k Load o 0.01% THD with 100k Load o Unity-Gain Stable up to CLOAD = 470pF o No Phase Inversion for Overdriven Inputs o Available in Space-Saving Packages 6-Pin SC70 or 6-Pin SOT23 (MAX4245) 8-Pin SOT23 or 8-Pin MAX (MAX4246) 10-Pin MAX (MAX4247)
MAX4245/MAX4246/MAX4247
Applications
Portable Communications Single-Supply Zero-Crossing Detectors Instruments and Terminals Electronic Ignition Modules Infrared Receivers Sensor-Signal Detection
PART
Ordering Information
TEMP. RANGE PINPACKAGE 6 SC70-6 6 SOT23-6 8 SOT23-8 8 MAX 10 MAX TOP MARK AAZ AAUB AAIN -- --
MAX4245AXT-T -40C to +125C MAX4245AUT-T -40C to +125C MAX4246AKA-T -40C to +125C MAX4246AUA MAX4247AUB -40C to +125C -40C to +125C
Pin Configurations Selector Guide
PART MAX4245AXT-T MAX4245AUT-T MAX4246AKA-T MAX4246AUA MAX4247AUB AMPLIFIERS PER PACKAGE 1 1 2 2 2 SHUTDOWN MODE Yes Yes No No Yes
VSS 2 5 SHDN
TOP VIEW
IN+ 1 6 VDD OUTA 1 8 VDD
MAX4245
MAX4246
INA2 7 OUTB
IN- 3
4
OUT
INA+
3
6 INB-
SC70-6/SOT23-6
VSS
4
5 INB+
SOT23-8/MAX-8
Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola Ltd. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (VDD to VSS) .........................-0.3V to +6V All Other Pins ...................................(VSS - 0.3V) to (VDD + 0.3V) Output Short-Circuit Duration (OUT shorted to VSS or VDD)................................. Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW 6-Pin SOT23 (derate 8.7mW/C above +70C)............695mW 8-Pin SOT23 (derate 9.1mW/C above +70C)............727mW 8-Pin MAX (derate 4.5mW/C above +70C) .............362mW 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+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.
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V, VSS = 0, VCM = 0, VOUT = VDD/2, RL connected from OUT to VDD/2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Range Supply Current (Per Amplifier) Supply Current in Shutdown Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Large-Signal Voltage Gain SYMBOL VDD IDD ISHDN_ VOS IB IOS RIN VCM CMRR PSRR AV VDD = +2.7V VDD = +5.5V SHDN_ = VSS (Note 2) VSS - 0.1V VCM VDD + 0.1V VSS - 0.1V VCM VDD + 0.1V VSS - 0.1V VCM VDD + 0.1V |VIN+ - VIN-| 10mV Inferred from CMRR test VSS - 0.1V VCM VDD + 0.1V 2.5V VDD 5.5V VSS + 0.05V VOUT VDD - 0.05V, RL = 100k VSS + 0.2V VOUT VDD - 0.2V, RL = 2k Output Voltage Swing High Output Voltage Swing Low Output Short-Circuit Current Output Leakage Current in Shutdown SHDN_ Logic Low SHDN_ Logic High SHDN_ Input Current VOH VOL IOUT(SC) IOUT(SH) VIL VIH IL/IH Specified as VDD - VOUT Specified as VOUT - VSS VDD = +5.0V RL = 100k RL = 2k RL = 100k RL = 2k Sourcing Sinking 95 VSS - 0.1 65 75 80 90 120 110 1 35 1 30 11 30 0.01 0.5 0.3 x VDD 0.7 x VDD 0.5 50 60 60 mV mV mA A V V nA CONDITIONS Inferred from PSRR test MIN 2.5 320 375 0.05 0.4 10 1 4000 VDD + 0.1 TYP MAX 5.5 650 700 0.5 1.5 50 6 UNITS V A A mV nA nA k V dB dB dB
Device in Shutdown Mode (SHDN_ = VSS), VSS VOUT VDD (Note 2) (Note 2) (Note 2) VSS SHDN_ VDD (Note 2)
2
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Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V, VSS = 0, VCM = 0, VOUT = VDD/2, RL connected from OUT to VDD/2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Gain-Bandwidth Product Phase Margin Gain Margin Slew Rate Input Voltage Noise Density Input Current Noise Density Capacitive-Load Stability Shutdown Delay Time Enable Delay Time Power-On Time Input Capacitance Total Harmonic Distortion Settling Time to 0.01% SYMBOL GBW M GM SR en in CLOAD t(SH) t(EN) tON CIN THD tS f = 10kHz, VOUT = 2Vp-p, AV = +1, VDD = +5.0V, Load = 100k to VDD/2 VOUT = 4V step, VDD = +5.0V, AV = +1 f = 10kHz f = 10kHz AV = 1 (Note 3) (Note 2) (Note 2) 3 4 4 2.5 0.01 10 CONDITIONS MIN TYP 1.0 70 20 0.4 52 0.1 470 MAX UNITS MHz degrees dB V/s nV/Hz pA/Hz pF s s s pF % s
MAX4245/MAX4246/MAX4247
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V, VSS = 0, VCM = 0, VOUT = VDD/2, RL connected from OUT to VDD/2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = -40C to +125C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Range Supply Current (Per Amplifier) Supply Current in Shutdown Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing High Output Voltage Swing Low Output Leakage Current in Shutdown SYMBOL VDD IDD ISHDN_ VOS TCVOS IB IOS VCM CMRR PSRR AV VOH VOL IOUT(SH) VDD = +2.7V SHDN_ = VSS (Note 2) VSS VCM VDD (Note 4) VSS VCM VDD (Note 4) VSS VCM VDD (Note 4) VSS VCM VDD (Note 4) Inferred from CMRR test (Note 4) VSS VCM VDD (Note 4) 2.5V VDD 5.5V VSS + 0.2V VOUT VDD - 0.2V, RL = 2k Specified as VDD - VOUT, RL = 2k Specified as VOUT - VSS, RL = 2k Device in Shutdown Mode (SHDN_ = VSS), VSS VOUT VDD (Note 3) VSS 60 70 85 90 90 1.0 2 100 10 VDD CONDITIONS Inferred from PSRR test MIN 2.5 TYP MAX 5.5 800 1 3.0 UNITS V A A mV V/C nA nA V dB dB dB mV mV A
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3
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V, VSS = 0, VCM = 0, VOUT = VDD/2, RL connected from OUT to VDD/2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = -40C to +125C, unless otherwise noted.) (Note 1)
PARAMETER SHDN_ Logic Low SHDN_ Logic High SHDN_ Input Current SYMBOL VIL VIH IL/IH (Note 2) (Note 2) VSS SHDN_ VDD (Notes 2, 3) 0.7 VDD 100 CONDITIONS MIN TYP MAX 0.3 VDD UNITS V V nA
Note 1: Note 2: Note 3: Note 4:
Specifications are 100% tested at TA = +25C. All temperature limits are guaranteed by design. Shutdown mode is only available in MAX4245 and MAX4247. Guaranteed by design, not production tested. For -40C to +85C, Input Common Mode Range is VSS - 0.1V VCM VDD + 0.1V
Typical Operating Characteristics
(VDD = 2.7V, VSS = VCM = 0, VOUT = VDD/2, no load, TA = +25C, unless otherwise noted.)
MAX4245/MAX4247 SHUTDOWN SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4245 toc01 MAX4245 toc02
SUPPLY CURRENT PER AMPLIFIER vs. SUPPLY VOLTAGE
500 450 400 IDD (A) 350 300 250 200 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VDD (V) TA = +125C 200
INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE
VDD = 2.5V 500 TA = +85C 400 VOS (V) TA = +125C
MAX4245 toc03
600
160
ISHDN (nA)
TA = +85C TA = +25C
120
300 200
TA = +25C
80 TA = -40C
TA = -40C 40
100 0 -40 15 70 125 0 0.5 1.0 1.5 2.0 2.5 TEMPERATURE (C) VCM (V)
0
INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE
MAX4245 toc04
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4245 toc05
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
VDD = 5.5V 15 10 TA = +125C TA = -40C
MAX4245 toc06
600 VDD = 5.5V 500
TA = +125C
350 300 250 VDD = 2.5V 200 150 100 50 0 VDD = 5.5V
20
TA = +85C 400 VOS (V) VOS (V) 300 200 TA = -40C 100 0 0 1 2 3 VCM (V) 4 5 6 TA = +25C
IBIAS (nA)
5 TA = +85C 0 -5 -10 TA = +25C -15
-40
15
70
125
0
1
2
3 VCM (V)
4
5
6
TEMPERATURE (C)
4
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Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps
Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = VCM = 0, VOUT = VDD/2, no load, TA = +25C, unless otherwise noted.)
OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE
MAX4245 toc07
MAX4245/MAX4246/MAX4247
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE
MAX4245 toc08
OUTPUT SWING HIGH vs. TEMPERATURE
40
MAX4245 toc09
14 12 10 ISOURCE (mA) 8 6 4 2 0 VDD = 2.5V VDD = 5.5V
50 45 40 35 ISINK (mA) 30 25 20 15 10 5 0 VDD = 2.5V VDD = 5.5V
VDD - VOUT (mV)
30 RL = 2k 20
10 RL = 100k 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VOUT (V) -40 15 70 125 TEMPERATURE (C)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VOUT (V)
OUTPUT SWING LOW vs. TEMPERATURE
MAX4245 toc10
CROSSTALK vs. FREQUENCY
MAX4245 toc11
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 -30 PSRR (dB) -40 -50 -60 -70
MAX4245 toc12
-50
0
40
-70 VOUT - VSS (mV) 30 RL = 2k 20 CROSSTALK (dB)
-90
10 RL = 100k 0 -40 15 70 125 TEMPERATURE (C)
-110
-80 -90
-130 0.001 0.01
-100 0.1 1 10 100 1000 10,000 0.1 10 10 100 1000 10,000 FREQUENCY (kHz) FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY
1
MAX4245 toc13
TOTAL HARMONIC DISTORTION PLUS NOISE vs. AMPLITUDE
MAX4245 toc14
GAIN AND PHASE vs. FREQUENCY
80 NO LOAD 60 40 30 -30 PHASE GAIN -90 -150 -210 -270 1 10 100 1000 10,000 FREQUENCY (kHz)
MAX4245 toc15
0.1 THD + N (%)
RL = 100k AV = +1 VOUT = 2Vp-p VDD = 5.0V THD + N (%)
10 RL = 100k AV = +1 fIN = 1kHz VDD = 5.0V
90
1
0.1
GAIN (dB) 0 1 2 3 4 5 OUTPUT VOLTAGE (VP-P)
0.01
20 0
0.01
0.001 0.001 0.0001 100 0.0001 1000 10,000 100,000 INPUT FREQUENCY (Hz) -20 -40 0.1
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5
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = VCM = 0, VOUT = VDD/2, no load, TA = +25C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY
80 2k || 470pF 60 40 GAIN (dB) 20 0 -20 -40 0.1 GAIN -150 -210 -270 1 10 100 1000 10,000 OUT PHASE 30
MAX4245 toc16
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
90
MAX4245 toc17
20mV/div PHASE (deg) -30 -90 IN
20mV/div
4s/div
FREQUENCY (kHz)
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4245 toc18
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4245 toc19
IN 20mV/div
IN
VDD = 5V 2V/div
20mV/div
2V/div
OUT
OUT
4s/div
40s/div
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4245 toc20
VDD = 5V IN 2V/div
2V/div OUT
40s/div
6
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Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps
Pin Description
PIN MAX4245 1 2 3 4 5 6 -- -- -- -- -- -- -- -- MAX4246 -- 4 -- -- -- 8 1 2 3 5 6 7 -- -- MAX4247 -- 4 -- -- -- 10 1 2 3 7 8 9 5 6 NAME IN+ VSS INOUT SHDN VDD OUTA INAINA+ INB+ INBOUTB SHDNA SHDNB Noninverting Input Ground or Negative Supply Inverting Input Amplifier Output Shutdown Positive Supply Amplifier Output Channel A Inverting Input Channel A Noninverting Input Channel A Noninverting Input Channel B Inverting Input Channel B Amplifier Output Channel B Shutdown Channel A Shutdown Channel B FUNCTION
MAX4245/MAX4246/MAX4247
VDD R3 IN R3 = R1R2 R3 = R1R2 R3
VDD
IN R1 R2 R1 R2
Figure 1a. Minimizing Offset Error Due to Input Bias Current (Noninverting)
Figure 1b. Minimizing Offset Error Due to Input Bias Current (Inverting)
Detailed Description
Rail-to-Rail Input Stage
The MAX4245/MAX4246/MAX4247 have rail-to-rail input and output stages that are specifically designed for low-voltage, single-supply operation. The input stage consists of composite NPN and PNP differential stages, which operate together to provide a common-mode range extending to both supply rails. The crossover region of these two pairs occurs halfway between VDD and VSS. The input offset voltage is typically 400V. Low-operating supply voltage, low supply current and rail-to-rail outputs make this family of operational amplifiers an excellent choice for precision or general-purpose, low-voltage, battery-powered systems. Since the input stage consists of NPN and PNP pairs, the input bias current changes polarity as the common-
mode voltage passes through the crossover region. Match the effective impedance seen by each input to reduce the offset error caused by input bias currents flowing through external source impedance (Figures 1a and 1b). The combination of high-source impedance plus input capacitance (amplifier input capacitance plus stray capacitance) creates a parasitic pole that can produce an underdamped signal response. Reducing input capacitance or placing a small capacitor across the feedback resistor improves response in this case. The MAX4245/MAX4246/MAX4247 family's inputs are protected from large differential input voltages by internal 5.3k series resistors and back-to-back triple-diode stacks across the inputs (Figure 2). For differentialinput voltages much less than 2.1V (triple-diode drop),
7
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Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
5.3k IN-
IN
2V/div
IN+ 5.3k
OUT
2V/div
Figure 2. Input Protection Circuit
input resistance is typically 4M. For differential voltages greater than 2.1V, input resistance is around 10.6k, and the input bias current can be approximated by the following equation: IB = (VDIFF - 2.1V) / 10.6k In the region where the differential input voltage approaches 2.1V, the input resistance decreases exponentially from 4M to 10.6k as the diodes begin to conduct. It follows that the bias current increases with the same curve. In unity-gain configuration, high slew-rate input signals may capacitively couple to the output through the triple-diode stacks.
400s/div
Figure 3. Rail-to-Rail Input/Output Voltage Range
2V/div
VDD
2V/div
Rail-to-Rail Output Stage
The MAX4245/MAX4246/MAX4247 can drive a 2k load and still typically swing within 35mV of the supply rails. Figure 3 shows the output voltage swing of the MAX4245 configured with AV = -1V/V.
OUT 10s/div
Applications Information
Power-Supply Considerations
The MAX4245/MAX4246/MAX4247 operate from a single +2.5V to +5.5V supply (or dual 1.25V to 2.75V supplies) and consume only 320A of supply current per amplifier. A 90dB power-supply rejection ratio allows the amplifiers to be powered directly off a decaying battery voltage, simplifying design and extending battery life.
Figure 4. Power-Up/Power-Down Waveform
Power-Up
The MAX4245/MAX4246/MAX4247 output typically settles within 4s after power-up. Figure 4 shows the output voltage on power-up and power-down.
SHDN_ high enables the amplifier. Figure 5 shows the MAX4245/MAX4247's shutdown waveform. Due to the output leakage currents of three-state devices and the small internal pullup current for SHDN_, do not let the SHDN_ float. Floating SHDN_ may result in indeterminate logic levels, and could adversely affect op amp operation. The logic threshold for SHDN_ is referred to VSS. When using dual supplies, pull SHDN_ to VSS, not GND, to shut down the op amp.
Driving Capacitive Loads
The MAX4245/MAX4246/MAX4247 are unity-gain stable for loads up to 470pF. Applications that require greater capacitive drive capability should use an isolation resistor between the output and the capacitive load
Shutdown Mode
The MAX4245/MAX4247 feature a low-power shutdown mode. When SHDN_ is pulled low, the supply current drops to 50nA per amplifier, the amplifier is disabled, and the output enters a high-impedance state. Pulling
8
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Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
2V/div
RISO OUT
SHDN
IN
RL
CL
2V/div
OUT 400s/div
Figure 6a. Using a Resistor to Isolate a Capacitive Load from the Op Amp
Figure 5. Shutdown Waveform
RISO = 0 RL = 2k CL = 2200pF
100mV/div
(Figure 6a-6c). Note that this alternative results in a loss of gain accuracy because RISO forms a voltage divider with the RLOAD.
IN
Power-Supply Bypassing and Layout
The MAX4245/MAX4246/MAX4247 family operates from either a single +2.5V to +5.5V supply or dual 1.25V to 2.75V supplies. For single-supply operation, bypass the power supply with a 100nF capacitor to VSS (in this case GND). For dual-supply operation, both the VDD and the VSS supplies should be bypassed to ground with separate 100nF capacitors. Good PC board layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp's inputs and output. To decrease stray capacitance, minimize trace lengths and widths by placing external components as close to the device as possible. Use surface-mount components when possible.
OUT 10s/div
100mV/div
Figure 6b. Pulse Response Without Isolating Resistor
RISO = 100 RL = 2k CL = 2200pF
100mV/div
IN
Pin Configurations (continued)
OUT
TOP VIEW
OUTA 1 10 VDD
100mV/div
10s/div
MAX4247
INA2 9 OUTB
Figure 6c. Pulse Response With Isolating Resistor
INA+
3
8 INB-
Chip Information
MAX4245 TRANSISTOR COUNT: 207 MAX4246/MAX4247 TRANSISTOR COUNT: 414 PROCESS: BiCMOS
VSS
4
7 INB+
SHDNA
5
6 SHDNB
MAX-10
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9
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps MAX4245/MAX4246/MAX4247
Package Information
SC70, 6L.EPS
10
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6LSOT.EPS
Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps
Package Information (continued)
SOT23, 8L.EPS
MAX4245/MAX4246/MAX4247
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA
10LUMAX.EPS
11
is a registered trademark of Maxim Integrated Products.

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