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19-1380; Rev 2a; 12/99
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps
General Description
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with Rail-to-Rail(R) operation at the inputs and outputs. These devices require only 650A per amplifier and operate from either a single supply (+2.4V to +6.5V) or dual supplies (1.2V to 3.25V). These unity-gain-stable amplifiers are capable of driving 250 loads and have a 5MHz gain-bandwidth product. The MAX4323 and MAX4327 feature a low-power shutdown mode that reduces supply current to 25A and places the outputs in a high-impedance state. With their rail-to-rail input common-mode range and output swing, these amplifiers are ideal for low-voltage, single-supply operation. In addition, low offset voltage and high speed make them the ideal signal-conditioning stages for precision, low-voltage data-acquisition systems. The MAX4322/MAX4323 are available in space-saving SOT23 packages.
____________________________Features
o SOT23 Packages (MAX4322/MAX4323) o +2.4V to +6.5V Single-Supply Operation o Rail-to-Rail Input Common-Mode Voltage Range o Rail-to-Rail Output Voltage Swing o 5MHz Gain-Bandwidth Product o 650A Quiescent Current per Amplifier o 700V Offset Voltage o No Phase Reversal for Overdriven Inputs o Drive 250 Loads o 25A Shutdown Mode (MAX4323/MAX4327) o Unity-Gain Stable for Capacitive Loads up to 500pF
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Ordering Information
PART TEMP. RANGE PINPACKAGE 5 SOT23-5 8 SO 8 MAX 8 SO 8 MAX 6 SOT23-6 8 MAX 8 SO 10 MAX 14 SO 14 SO TOP MARK ACGE -- -- -- -- AAEC -- -- -- -- --
Selector Guide
PART BW (MHz) 5 5 5 5 5 NO. OF AMPS 1 1 2 2 4 PINPACKAGE 5 SOT23-5, 8 MAX/SO 8 MAX/SO/ 6 SOT23-6 8 MAX/SO 10 MAX, 14 SO 14 SO SHUTDOWN
MAX4322 MAX4323 MAX4326 MAX4327 MAX4329
-- Yes -- Yes --
MAX4322EUK-T -40C to +85C MAX4322ESA -40C to +85C MAX4322EUA -40C to +85C MAX4323ESA -40C to +85C MAX4323EUA -40C to +85C MAX4323EUT -40C to +85C MAX4326EUA -40C to +85C MAX4326ESA -40C to +85C MAX4327EUB -40C to +85C MAX4327ESD -40C to +85C MAX4329ESD -40C to +85C
________________________Applications
Battery-Powered Instruments Portable Equipment Data-Acquisition Systems Signal Conditioning Low-Power, Low-Voltage Applications
6
Typical Operating Circuit
+5V
MAX187 3 SHDN DOUT SCLK CS VDD AIN VREF GND 1 2 MAX4322 4 5
Pin Configurations appear at end of data sheet.
SERIAL INTERFACE
8 7
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC-VEE) ..................................................+7.5V All Other Pins ...................................(VCC + 0.3V) to (VEE - 0.3V) Output Short-Circuit Duration.....................................Continuous (short to either supply) Continuous Power Dissipation (TA = +70C) 5-pin SOT23-5 (derate 7.1mW/C above +70C) .........571mW 6-pin SOT23 (derate 7.1mW/C Above + 70C) ...........571mW 8-pin SO (derate 5.88mW/C above +70C).................471mW 8-pin MAX (derate 4.10mW/C above +70C) ............330mW 10-pin MAX (derate 5.6mW/C above +70C) ............444mW 14-pin SO (derate 8.00mW/C above +70C)...............640mW Operating Temperature Range MAX432_E__ ....................................................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +160C 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--TA = +25C
(VCC = +5.0V, VEE = 0, VCM = 0, VOUT = VCC / 2, SHDN = VCC, RL tied to VCC / 2, unless otherwise noted.) PARAMETER Input Offset Voltage Input Bias Current Input Offset Current Differential Input Resistance Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output Resistance Large-Signal Voltage Gain CONDITIONS MAX432_ESA/MAX4327ESD VCM = VEE, VCC All other packages VCM = VEE, VCC VCM = VEE, VCC -1.5V < VDIFF < 1.5V Inferred from CMRR test VEE VCM VCC MAX432_ESA/MAX4327ESD All other packages VEE 62 60 66 94 dB 91 100 0.1 106 70 86 dB dB MIN TYP 0.7 1.2 50 1 500 VCC MAX 2.0 2.50 150 12 UNITS mV nA nA k V
VCC = 2.4V to 6.5V AV = +1V/V VOUT = 0.25V to 4.75V, RL = 100k VOUT = 0.4V to 4.6V, RL = 250
2
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Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps
DC ELECTRICAL CHARACTERISTICS--TA = +25C (continued)
(VCC = +5V, VEE = 0, VCM = 0, VOUT = VCC / 2, SHDN = VCC, RL tied to VCC / 2, unless otherwise noted.) PARAMETER MAX4322/ MAX4323 Output Voltage Swing MAX4326/ MAX4327/ MAX4329 Output Short-Circuit Current SHDN Logic Threshold SHDN Input Current Operating Supply-Voltage Range Supply Current per Amplifier Shutdown Supply Current per Amplifier MAX4323/MAX4327 MAX4323/MAX4327 Inferred from PSRR test VCM = VOUT = VCC / 2 SHDN > 0.8V, MAX4323/MAX4327 VCC = 2.4V VCC = 5V VCC = 2.4V VCC = 5V 2.4 650 725 25 40 60 1100 Low High 2.0 1 4 6.5 RL = 100k RL = 250 CONDITIONS RL = 100k RL = 250 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN TYP 12 20 200 100 15 25 220 120 50 0.8 350 250 mA V A V A A 300 200 mV MAX UNITS
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
DC ELECTRICAL CHARACTERISTICS--TA = -40C to +85C
(VCC = +5V, VEE = 0, VCM = 0, VOUT = VCC / 2, SHDN = VCC, RL tied to VCC / 2, unless otherwise noted.) (Note 1) PARAMETER Input Offset Voltage Input Offset Voltage Tempco Input Bias Current Input Offset Current Common-Mode Input Voltage Range Common-Mode Rejection Ratio VCM = VEE, VCC VCM = VEE, VCC Inferred from CMRR test VEE VCM VCC MAX432_ESA/MAX4327ESD All other packages VEE 59 dB 54 CONDITIONS MAX432_ESA/MAX4327ESD VCM = VEE, VCC All other packages 2 180 20 VCC MIN TYP MAX 3.0 6.0 UNITS mV V/C nA nA V
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3
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
DC ELECTRICAL CHARACTERISTICS --TA = -40C to +85C (continued)
(VCC = +5V, VEE = 0, VCM = 0, VOUT = VCC / 2, SHDN = VCC, RL tied to VCC / 2, unless otherwise noted.) (Note 1) PARAMETER Power-Supply Rejection Ratio Large-Signal Voltage Gain VCC = 2.4V to 6.5V VOUT = 0.4V to 4.6V, RL = 250 MAX4322/ MAX4323 Output Voltage Swing MAX4326/ MAX4327/ MAX4329 RL = 250 VCC - VOH VOL - VEE VCC - VOH RL = 250 VOL - VEE Low High 2.0 5 2.4 VCM = VCC / 2 SHDN 0.8V, MAX4323/MAX4327 6.5 1.2 70 300 0.8 V A V mA A CONDITIONS MIN 62 66 350 250 400 mV TYP MAX UNITS dB dB
SHDN Logic Threshold SHDN Input Current Operating Supply-Voltage Range Supply Current per Amplifier Shutdown Supply Current per Amplifier
MAX4323/MAX4327 MAX4323/MAX4327
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0, VCM = VOUT = VCC / 2, SHDN = VCC, TA = +25C unless otherwise noted.) PARAMETER Gain-Bandwidth Product Phase Margin Gain Margin Total Harmonic Distortion Slew Rate Settling Time to 0.01% Turn-On Time SHDN Delay Input Capacitance Input Noise Voltage Density Input Noise Current Density Amp-Amp Isolation Capacitive Load Stability AV = +1V/V f = 1kHz f = 1kHz AV = +1V/V, VOUT = 2V step VCC = 0 to 3V step MAX4323/MAX4327 Enable Disable f = 10kHz, VOUT = 2Vp-p, AV = +1V/V CONDITIONS MIN TYP 5 64 12 0.003 2 2.0 1 1 0.2 3 22 0.4 135 250 MAX UNITS MHz degrees dB % V/s s s s pF nV/Hz pA dB pF
Note 1: All devices are 100% tested at TA = +25C. All temperature limits are guaranteed by design.
4
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Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = VCC / 2, SHDN = VCC, TA = +25C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY (WITH CLOAD)
180 144 40 GAIN GAIN (dB) 20 108 PHASE (DEGREES) 72 36 0 0 PHASE -36 -72 -20 AV = +1000 NO LOAD 1k 10k 100k 1M 10M -108 -144 -180 100M -40 100 -20 AV = +1000 RL = CL = 500pF 1k 10k 100k 1M 10M 40 GAIN 60
MAX4322/26/29-02
GAIN AND PHASE vs. FREQUENCY
60
MAX4322/26/29-01
POWER-SUPPLY REJECTION vs. FREQUENCY
144 108 PHASE (DEGREES) 72 36 0 -20 PSR (dB) -40 -60 -80 -100 10 100 1k 10k 100k 1M 10M 100M 0 AV = +1
MAX4322/26/29-03
180
GAIN (dB)
20
0
PHASE
-36 -72 -108 -144 -180 100M
-40 100
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4326/MAX4327/MAX4329 CHANNEL SEPARATION vs. FREQUENCY
MAX4322/26/29-04
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4322/26/29-05
MAX4323/MAX4327 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT (mA)
MAX4323-11
130 120 CHANNEL SEPARATION (dB) 110 100 90 80 70 60 50 100 1k 10k 100k FREQUENCY (Hz) 1M
100 AV = +1 OUTPUT IMPEDANCE () 10
60 50 40 30 20 10 SHDN = 0V 0 VCC = 2.7V VCC = 6.5V
1
0.1
0.01 10M 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz)
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (C)
SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4322/26/29-6
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4322/26/29-7
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 VCC = 2.7V VCC = 6.5V
MAX4322/26/29-8
900 850 SUPPLY CURRENT (A) 800 750 700 650 600 550 500 -40 -25 -10 5 20 35 50 65 80 VCC = 2.7V VCC = 6.5V
3.00 2.25 1.50 VOLTAGE (mV) 0.75 0 -0.75 -1.50 -2.25 -3.00 -40 -25 -10 5 20 35 50 65 80 SO PACKAGE SOT23-5/6 PACKAGE
50
95
95
0
1
2
3
4
5
6
TEMPERATURE (C)
TEMPERATURE (C)
COMMON-MODE VOLTAGE (V)
_______________________________________________________________________________________
5
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC / 2, SHDN = VCC, TA = +25C, unless otherwise noted.)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4322/26/29-9
COMMON-MODE REJECTION vs. TEMPERATURE
MAX4322/26/29-10
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE
RL TO VCC 200 VOUT - VEE (mV) VCC = 6.5V, RL = 500
MAX4322/26/29-11
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 -60 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C) VCC = 6.5V, VCM = VEE VCC = 2.7V, VCM = VEE VCC = 6.5V, VCM = VCC VCC = 2.7V, VCM = VCC
120 COMMON-MODE REJECTION (dB) 115 110 105 100 95 90 85 80 -40 -25 -10 5 20 35 50 65 80 VCM = -0.2V TO 5.2V VCM = 0 TO 5.0V
250
150 VCC = 2.7V, RL = 500 100
50
VCC = 6.5V, RL = 100k VCC = 2.7V, RL = 100k -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C)
0 95 TEMPERATURE (C)
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4322/26/29-12
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4322/26/29-13
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
VCC = 6.5V RL TO VEE RL = 100k
MAX4322/26/29-14
300 RL TO VEE 250 VCC - VOUT (mV) 200 VCC = 6.5V, RL = 500
120 110 100 GAIN (dB)
VCC = 2.7V RL TO VEE
120 110 100 GAIN (dB) 90 80
RL = 100k
RL = 10k RL = 2k RL = 500
RL = 10k RL = 2k
150 100 50 0
VCC = 2.7V, RL = 500
90 80
VCC = 6.5V, RL = 100k (TOP) VCC = 2.7V, RL = 100k (BOTTOM)
RL = 500 70 60 70 60 0 100 200 300 400 500 600 0 100 200 300 400 500 600 OUTPUT VOLTAGE: FROM VCC (mV) OUTPUT VOLTAGE: FROM VCC (mV)
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (C)
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4322/26/29-15
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4322/26/29-16
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
VCC = 6.5V RL TO VCC RL = 100k RL = 10k RL = 2k
MAX4322/26/29-17
125 120 115 110 GAIN (dB) 105 100 95 90 85 80 75
RL = 500 VOUT(p-p) = VCC - 1V
120 110 100 GAIN (dB) 90 80 70 RL = 2k RL = 500 VCC = 2.7V RL TO VCC RL = 100k RL = 10k
120 110 100 GAIN (dB) 90
VCC = 6.5V, RL TO VEE VCC = 2.7V, RL TO VEE
RL = 500 80 70 60
VCC = 6.5V, RL TO VCC
VCC = 2.7V, RL TO VCC 60 -40 -25 -10 5 20 35 50 65 80 95 0 100 200 300 400 500 600 TEMPERATURE (C) OUTPUT VOLTAGE: FROM VEE (mV) 0 100 200 300 400 500 600
OUTPUT VOLTAGE: FROM VEE (mV)
6
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Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC / 2, SHDN = VCC, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4322/26/29-18
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MAX4322/26/29-19
TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY
0.035 0.030 THD + NOISE (%) 0.025 0.020 0.015 0.010 0.005 0 AV = +1 2Vp-p SIGNAL 500kHz LOWPASS FILTER RL = 10k TO VCC / 2
MAX4322/26/29-20
125 120 115 110 GAIN (dB) 105 100 95 90 85 80 75 -40 -25 -10
VCC = 6.5V, RL TO VEE VCC = 6.5V, RL TO VCC
1.9 MINIMUM OPERATING VOLTAGE (V) 1.8 1.7 1.6 1.5 1.4 1.3 1.2
0.040
VCC = 2.7V, RL TO VEE VCC = 2.7V, RL TO VCC
VOUT(p-p) = VCC - 600mV RL = 100k 5 20 35 50 65 80 95
-40 -25 -10
5
20
35
50
65
80
95
10
100
TEMPERATURE (C)
TEMPERATURE (C)
1k 10k FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION AND NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
MAX4322/26/29-21
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4322/26/29-22
AV = +1 10kHz SINE WAVE RL TO VCC / 2 500kHz LOWPASS FILTER
AV = +1
AV = -1
VOLTAGE (50mV/div)
0.01
RL = 250
RL = 2k
RL = 10k 0.001 4.0 4.2 4.4
RL = 100k
OUT
VOLTAGE (50mV/div)
IN
IN
THD + NOISE (%)
OUT
4.6
4.8
5.0
TIME (200ns/div)
TIME (200ns/div)
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
AV = +1
MAX4322/26/29-24
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
AV = -1
MAX4322/26/29-26
IN VOLTAGE (2V/div) VOLTAGE (2V/div)
IN
OUT
OUT
TIME (2s/div)
TIME (2s/div)
_______________________________________________________________________________________
7
MAX4322/26/29-23
0.1
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Pin Description
PIN MAX4322 1 2 3 4 5 -- 6 4 -- -- 7 1, 5, 8 1 2 3 4 6 -- MAX4323 6 4 -- -- 7 1, 5 SOT23-5 SO/MAX SOT23-6 SO/MAX MAX4326 -- 4 -- -- 8 -- MAX4327 MAX -- 4 -- -- 10 -- SO -- 4 -- -- 14 5, 7, 8, 10 -- NAME MAX4329 -- 11 -- -- 4 -- OUT VEE IN+ INVCC N.C. Output Negative Supply. Ground for single-supply operation. Noninverting Input Inverting Input Positive Supply No Connection Shutdown Control. Tie high or leave floating to enable amplifier. Outputs for amps 1 and 2 Inverting Inputs for amps 1 and 2 Noninverting Inputs for amps 1 and 2 Shutdown Control for amps 1 and 2. Tie high or leave floating to enable amplifier. Outputs for amps 3 and 4 Inverting Inputs for amps 3 and 4 Noninverting Inputs for amps 3 and 4 FUNCTION
--
--
5
8
--
--
SHDN OUT1, OUT2 IN1-, IN2IN1+, IN2+ SHDN1, SHDN2 OUT3, OUT4 IN3-, IN4IN3+, IN4+
-- -- --
-- 2 3
-- -- --
-- 2 3
1, 7 2, 6 3, 5
1, 9 2, 8 3, 7
1, 13 2, 12 3, 11
1, 7 2, 6 3, 5
--
--
--
--
--
5, 6
5, 9
--
-- -- --
-- -- --
-- -- --
-- -- --
-- -- --
-- -- --
-- -- --
8, 14 9, 13 10, 12
__________ Applications Information
Rail-to-Rail Input Stage
Devices in the MAX4322/MAX4323/MAX4326/MAX4327/ MAX4329 family of high-speed amplifiers have rail-torail input and output stages designed for low-voltage, single-supply operation. The input stage consists of separate NPN and PNP differential stages, which combine to provide an input common-mode range extending to the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The input offset voltage is typically below 250V. The
8
switchover transition region, which occurs near VCC / 2, has been extended to minimize the slight degradation in CMRR caused by the mismatch of the input pairs. Their low offset voltage, high bandwidth, and rail-to-rail common-mode range make these op amps excellent choices for precision, low-voltage, data-acquisition systems. Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region. To reduce the offset error caused by input bias currents flowing through external source impedances, match the effective impedance seen by each input (Figures 1a, 1b). High source impedances, together
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Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
with the input capacitance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves the response. The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329's inputs are protected from large differential input voltages by 1k series resistors and back-to-back triple diodes across the inputs (Figure 2). For differential input voltages less than 1.8V the input resistance is typically 500k. For differential input voltages greater than 1.8V the input resistance is approximately 2k, and the input bias current is determined by the following equation: VDIFF - 1.8V 2k
Rail-to-Rail Output Stage
The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (VEE). Figure 3 shows the input voltage range and output voltage swing of a MAX4322 connected as a voltage follower. With a +3V supply and the load tied to ground, the output swings from 0.00V to 2.90V. The maximum output voltage swing depends on the load, but will be within 350mV of a +5V supply, even with the maximum load (500 to ground). Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quiescent current. The MAX4322/MAX4323/MAX4326/ MAX4327/MAX4329 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 500pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5 and 6 show the response with capacitive loads and the results of adding an isolation resistor in series with the output (Figure 7). The resistor improves the circuit's phase margin by isolating the load capacitor from the op amp's output.
IBIAS =
R3
R3
MAX4322/MAX4323 MAX4326/MAX4327 MAX4329
MAX4322/MAX4323 MAX4326/MAX4327 MAX4329
R2 R3 = R1 R2 R1 R2
R1 R3 = R1 R2
Figure 1a. Reducing Offset Error Due to Bias Current (Noninverting)
Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)
1k
1k
Figure 2. Input Protection Circuit
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9
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Power-Up and Shutdown Mode
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 amplifiers typically settle within 1s after power-up. Using the test circuit of Figure 8, Figures 9 and 10 show the output voltage and supply current on power-up. The MAX4323 and MAX4327 have a shutdown option. When the shutdown pin (SHDN) is pulled low, the supply current drops below 25A per amplifier and the amplifiers are disabled with the outputs in a highimpedance state. Pulling SHDN high or leaving it floating enables the amplifier. In the dual-amplifier MAX4327, the shutdown functions operate independently. Figures 11 and 12 show the output voltage and supply current responses of the MAX4323 to a shutdown pulse.
Power Supplies and Layout
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 operate from a single +2.4V to +6.5V power supply, or from dual supplies of 1.2V to 3.25V. For single-supply operation, bypass the power supply with a 0.1F ceramic capacitor in parallel with at least 1F. For dual supplies, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance at the op amp's inputs and outputs. To decrease stray capacitance, minimize trace lengths and resistor leads by placing external components close to the op amp's pins.
IN
VCC = 3V AV = +1
10,000
CAPACITIVE LOAD (pF)
VOLTAGE (1V/div)
UNSTABLE REGION
1000
OUT
RL TO VEE VOUT = VCC/2 TIME (2s/div) 100 100 1k 10k 100k RESISTIVE LOAD ()
Figure 3. Rail-to-Rail Input /Output Voltage Range
Figure 4. Capacitive-Load Stability
AV = +1 CL = 500pF VOLTAGE (50mV/div) VOLTAGE (50mV/div) IN IN
AV = +1 CL = 1000pF RS = 39
OUT
OUT
TIME (400ns/div)
TIME (400ns/div)
Figure 5. Small-Signal Transient Response with Capacitive Load 10
Figure 6. Transient Response to Capacitive Load with Isolation Resistor
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Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
VCC 0V TO 2.7V STEP FOR POWER-UP TEST 2k
MAX4322/MAX4323 MAX4326/MAX4327 MAX4329
VOUT
RS
CL
MAX4322/MAX4323 MAX4326/MAX4327 MAX4329
2k
SUPPLY-CURRENT 10 MONITORING POINT
10k
Figure 7. Capacitive-Load-Driving Circuit
Figure 8. Power-Up Test Circuit
VCC VOLTAGE (1V/div)
VCC (1V/div)
OUT
ICC (500A/div)
TIME (5s/div)
TIME (5s/div)
Figure 9. Power-Up Output Voltage
Figure 10. Power-Up Supply Current
VCC = 2.7V RL = 10k SHDN (1V/div) SHDN (1V/div)
VCC = 2.7V
OUT (0.5V/div)
ICC (500A/div)
TIME (2s/div)
TIME (2s/div)
Figure 11. Shutdown Output Voltage
Figure 12. Shutdown Enable/Disable Supply Current
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11
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
___________________________________________________________Pin Configurations
TOP VIEW
OUT 1
5
VCC
OUT 1
6
VCC
N.C. 1 IN1- 2
8
N.C. VCC OUT N.C.
N.C. 1 IN1- 2 IN1+ 3 VEE 4
8
SHDN VCC OUT N.C.
VEE 2
MAX4322
VEE 2
MAX4323
5
SHDN IN1+ 3
MAX4322
7 6 5
MAX4323
7 6 5
IN+ 3
4
IN-
IN+ 3
4
IN-
VEE 4
SOT23-5
SOT23-6
SO/MAX
SO
OUT1 1 IN1- 2 IN1+ 3 VEE 4
8
VCC OUT2 IN2IN2+
OUT1 1 IN1- 2 IN1+ 3
14 VCC 13 OUT2 12 IN2-
OUT1 1 IN1IN1+ VEE SHDN1 2 3 4 5
10 VCC 9 OUT2 IN2IN2+ SHDN2
OUT1 1 IN1- 2 IN1+ 3 VCC 4 IN2+ 5 IN2- 6 OUT2 7
14 OUT4 13 IN412 IN4+
MAX4326
7 6 5
MAX4327
8 7 6
VEE 4 N.C. 5 SHDN1 6
MAX4327
11 IN2+ 10 N.C. 9 8 SHDN2 N.C.
MAX4329
11 VEE 10 IN3+ 9 8 IN3OUT3
SO/MAX
N.C. 7
MAX
SO
SO
Chip Information
MAX4322 TRANSISTOR COUNT: 170 MAX4323 TRANSISTOR COUNT: 170 MAX4326 TRANSISTOR COUNT: 340 MAX4327 TRANSISTOR COUNT: 340 MAX4329 TRANSISTOR COUNT: 680 SUBSTRATE CONNECTED TO VEE
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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