General Description
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
family of operational amplifiers combines wide bandwidth
and excellent DC accuracy with Rail-to-Rail®operation at
the inputs and outputs. These devices consume only
650µA per amplifier and operate from either a single sup-
ply (2.4V to 6.5V) or dual supplies (±1.2V to ±3.25V). These
unity-gain-stable amplifiers are capable of driving 250Ω
loads and have a 5MHz gain-bandwidth product. The
MAX4323 and MAX4327 feature a low-power shutdown
mode that reduces supply current to 25µA 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-condition-
ing stages for precision, low-voltage data-acquisition
systems.
The MAX4323 is offered in a small 6-bump chip-scale
package (UCSP™). The MAX4322/MAX4323 are also
available in space-saving SOT23 packages.
________________________Applications
Battery-Powered Data-Acquisition
Instruments Systems
RSSI Systems Signal Conditioning
PA Biasing Portable Equipment
Low-Power, Low-Voltage
Applications
____________________________Features
♦6-Bump UCSP Package (MAX4323)
♦2.4V to 6.5V Single-Supply Operation
♦Rail-to-Rail Input Common-Mode Voltage Range
♦Rail-to-Rail Output Voltage Swing
♦5MHz Gain-Bandwidth Product
♦650µA Quiescent Current per Amplifier
♦700µV Offset Voltage
♦No Phase Reversal for Overdriven Inputs
♦Drive 250ΩLoads
♦25µA Shutdown Mode (MAX4323/MAX4327)
♦Unity-Gain Stable for Capacitive Loads
Up to 500pF
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
________________________________________________________________ Maxim Integrated Products 1
Pin Configurations
19-1380; Rev 3; 10/02
Ordering Information
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
UCSP is a trademark of Maxim Integrated Products, Inc.
Selector Guide
TOP VIEW
(BUMPS ON BOTTOM)
UCSP
MAX4323
1
2
3
VEE
A
B
OUT
VCC
IN+
IN-
SHDN
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.
PART TEMP
RANGE
PIN/BUMP-
PACKAGE
TOP
MARK
MAX4322EUK-T -40oC to +85oC 5 SOT23-5 ACGE
MAX4322EUA -40oC to +85oC 8 µMAX —
MAX4322ESA -40oC to +85oC 8 SO —
Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet.
10 µMAX, 14 SO
25MAX4327 Yes
8 µMAX/SO25MAX4326 —
—
Yes
—
SHUTDOWN
14 SO
6 SOT23/UCSP,
8 µMAX/SO
5 SOT23,
8 µMAX/SO
PIN/BUMP-
PACKAGE
45MAX4329
15MAX4323
PART
15MAX4322
NO. OF
AMPS
BW
(MHz)
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS—TA= +25°C
(VCC = 5.0V, VEE = 0V, VCM = 0V, VOUT = VCC/2, SHDN = VCC, RLconnected to VCC/2, unless otherwise noted.)
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.
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= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Bump UCSP (derate 3.9mW/°C above +70°C).........308mW
6-Pin SOT23 (derate 7.1mW/°C Above + 70°C) ..........571mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin µMAX (derate 4.10mW/°C above +70°C) ...........330mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.00mW/°C above +70°C)..............640mW
Operating Temperature Range
MAX432_E__ ...................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Bump Reflow Temperature ..............................................+235°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX432_ESA/
MAX4327ESD ±0.7 ±2.0
Input Offset Voltage VOS VCM = VEE or VCC
All other packages ±1.2 ±2.50
mV
Input Bias Current IBVCM = VEE or VCC ±50 ±150 nA
Input Offset Current IOS VCM = VEE or VCC ±1 ±12 nA
Differential Input Resistance RIN -1.5V < VDIFF < +1.5V 500 kΩ
Common-Mode Input Voltage
Range CMVR Inferred from CMRR test VEE VCC V
MAX432_ESA/
MAX4327ESD 62 94
Common-Mode Rejection Ratio CMRR VEE ≤ VCM ≤ VCC
All other packages 60 91
dB
Power-Supply Rejection Ratio PSRR VCC = 2.4V to 6.5V 66 100 dB
Output Resistance ROUT AV = +1V/V 0.1 Ω
VOUT = 0.25V to 4.75V, RL = 100kΩ106
Large-Signal Voltage Gain AVVOUT = 0.4V to 4.6V, RL = 250Ω70 86 dB
VCC - VOH 12
RL = 100kΩVOL - VEE 20
VCC - VOH 200 300
MAX4322/
MAX4323 RL = 250ΩVOL - VEE 100 200
VCC - VOH 15
RL = 100kΩVOL - VEE 25
VCC - VOH 220 350
Output Voltage Swing VO
MAX4326/
MAX4327/
MAX4329 RL = 250ΩVOL - VEE 120 250
mV
Output Short-Circuit Current ISC 50 mA
VIL Low 0.8
SHDN Logic Threshold VIH
MAX4323/MAX4327 High 2.0 V
SHDN Input Current MAX4323/MAX4327 ±1 ±4 µA
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS—TA= -40°C to +85°C
(VCC = 5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, SHDN = VCC, RLconnected to VCC/2, unless otherwise noted.) (Note 1)
DC ELECTRICAL CHARACTERISTICS—TA= +25°C (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, SHDN = VCC, RLconnected to VCC/2, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX432_ESA/
MAX4327ESD ±3.0
Input Offset Voltage VOS VCM = VEE or VCC
All other packages ±6.0
mV
Input Offset Voltage Tempco TCVOS ±2 µV/°C
Input Bias Current IBVCM = VEE or VCC ±180 nA
Input Offset Current IOS VCM = VEE or VCC ±20 nA
Common-Mode Input
Voltage Range CMVR Inferred from CMRR test VEE VCC V
MAX432_ESA/
MAX4327ESD 59
Common-Mode Rejection Ratio CMRR VEE ≤ VCM ≤ VCC
All other packages 54
dB
Power-Supply Rejection Ratio PSRR VCC = 2.4V to 6.5V 62 dB
Large-Signal Voltage Gain AVVOUT = 0.4V to 4.6V, RL = 250Ω66 dB
VCC - VOH 350
MAX4322/
MAX4323 RL = 250ΩVOL - VEE 250
VCC - VOH 400
Output Voltage Swing VOMAX4326/
MAX4327/
MAX4329
RL = 250Ω
VOL - VEE 300
mV
VIL Low 0.8
SHDN Logic Threshold VIH
MAX4323/MAX4327 High 2.0 V
SHDN Input Current MAX4323/MAX4327 ±5 µA
Operating Supply Voltage Range VCC 2.4 6.5 V
Supply Current per Amplifier ICC VCM = VOUT = VCC/2 1200 µA
Shutdown Supply Current
per Amplifier I SHDN V SHDN ≤ 0.8V, MAX4323/MAX4327 70 µA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range VCC Inferred from PSRR test 2.4 6.5 V
VCC = 2.4V 650
Supply Current per Amplifier ICC VCM = VOUT = VCC/2 VCC = 5V 725 1100 µA
VCC = 2.4V 25
Shutdown Supply Current
per Amplifier I SHDN V SHDN ≤ 0.8V,
MAX4323/MAX4327 VCC = 5V 40 60 µA
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = 0V, VCM = VOUT = VCC/2, SHDN = VCC, TA= +25°C, unless otherwise noted.)
Note 1: All devices are 100% tested at TA= +25°C. All temperature limits are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Gain-Bandwidth Product GBWP 5 MHz
Phase Margin φM64 Degrees
Gain Margin GM12 dB
Total Harmonic Distortion THD f = 10kHz, VOUT = 2VP-P, AV = +1V/V 0.003 %
Slew Rate SR 2 V/µs
Settling Time to 0.01% tSAV = +1V/V, VOUT = 2V step 2.0 µs
Turn-On Time tON VCC = 0 to 3V step 1 µs
Enable 1
SHDN Delay MAX4323/MAX4327 Disable 0.2 µs
Input Capacitance CIN 3pF
Input Noise-Voltage Density enf = 1kHz 22 nV/√Hz
Input Noise-Current Density inf = 1kHz 0.4 pA/√Hz
Amp-Amp Isolation 135 dB
Capacitive-Load Stability CLAV = +1V/V 250 pF
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 5
60
-40
100 1k 10k 1M 10M100k 100M
GAIN AND PHASE vs. FREQUENCY
-20
FREQUENCY (Hz)
GAIN (dB)
0
20
40
PHASE
GAIN
AV = +1000
NO LOAD
PHASE (DEGREES)
180
144
72
0
-72
-144
-180
-108
-36
36
108
MAX4322/26/29-01 60
-40
100 1k 10k 1M 10M100k 100M
GAIN AND PHASE vs. FREQUENCY
(WITH CLOAD)
-20
MAX4322/26/29-02
FREQUENCY (Hz)
GAIN (dB)
0
20
40
PHASE
GAIN
AV = +1000
RL = ∞
CL = 500pF
PHASE (DEGREES)
180
144
72
0
-72
-144
-180
-108
-36
36
108
0
-100
10 100 1k 100k 1M 10M10k 100M
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4322/26/29-03
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
AV = +1
__________________________________________Typical Operating Characteristics
(VCC = 5V, VEE = 0V, VCM = VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.)
1k 10k 10M
FREQUENCY (Hz)
100k 1M100
130
50
60
70
80
90
100
110
120
MAX4326/MAX4327/MAX4329
CHANNEL SEPARATION vs. FREQUENCY
MAX4322/26/29-04
CHANNEL SEPARATION (dB)
100
0.01
100 1k 100k 1M 10M
10k 100M
OUTPUT IMPEDANCE
vs. FREQUENCY
0.1
MAX4322/26/29-05
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1
10
AV = +1
900
500
550
600
650
700
750
800
850
-40 -25 -10 5 20 35 50 65 80 95
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
MAX4322/26/29-07
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VCC = 6.5V
VCC = 2.7V
-3.00
-2.25
-0.75
-1.50
0
1.50
0.75
2.25
3.00
-40 -25 -10 5 20 35 50 65 80 95
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4322/26/29-08
TEMPERATURE (°C)
VOLTAGE (mV)
SOT23-5/6
PACKAGE
SO PACKAGE
-50
0123456
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4322/26/29-09
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
-40
-30
-20
-10
0
10
20
30
40
50
VCC = 2.7V
VCC = 6.5V
0
10
20
30
40
50
60
-40 -25 -10 5 20 35 50 65 80 95
MAX4323/MAX4327
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4323-06
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (µA)
VCC = 6.5V
VCC = 2.7V
VSHDN = 0V
_____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0V, VCM = VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.)
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
6 _______________________________________________________________________________________
120
80
85
90
95
100
105
110
115
-40 -25 -10 5 20 35 50 65 80 95
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
MAX4322/26/29-11
TEMPERATURE (°C)
CMRR (dB)
VCM = 0 TO 5.0V
VCM = -0.2V TO 5.2V
250
0
-40 -25 -10 5 20 35 50 65 80 95
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
50
200
MAX4322/26/29-12
TEMPERATURE (°C)
VOUT - VEE (mV)
150
100
RL TO VCC
VCC = 6.5V, RL = 500Ω
VCC = 2.7V, RL = 100kΩ
VCC = 2.7V, RL = 500Ω
VCC = 6.5V, RL = 100kΩ
0
50
100
150
200
250
300
-40 -25 -10 5 20 35 50 65 80 95
MAXIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4322/26/29-13
TEMPERATURE (°C)
VCC - VOUT (mV)
RL TO VEE
VCC = 6.5V, RL = 500Ω
VCC = 2.7V, RL = 100kΩ (BOTTOM)
VCC = 2.7V, RL = 500Ω
VCC = 6.5V, RL = 100kΩ (TOP)
120
60
0 600
110
OUTPUT VOLTAGE: FROM VCC (mV)
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4322/26/29-14
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 2.7V
RL TO VEE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
120
60
0 600
110
OUTPUT VOLTAGE: FROM VCC (mV)
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4322/26/29-15
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 6.5V
RL TO VEE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
125
75
-40 -25 -10 5 20 35 50 65 80 95
LARGE-SIGNAL GAIN
vs. TEMPERATURE
85
115
MAX4322/26/29-16
TEMPERATURE (°C)
GAIN (dB)
105
95
80
90
120
110
100
VCC = 2.7V,
RL TO VEE
VCC = 6.5V, RL TO VCC
VCC = 2.7V, RL TO VCC
RL = 500Ω
VOUT(P-P) = VCC - 1V VCC = 6.5V,
RL TO VEE
120
60
0 600
110
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4322/26/29-17
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
VCC = 2.7V
RL TO VCC
OUTPUT VOLTAGE: FROM VEE (mV)
120
60
0 600
110
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4322/26/29-18
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 6.5V
RL TO VCC
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
OUTPUT VOLTAGE: FROM VEE (mV)
-60
-50
-40 -25 -10 5 20 35 50 65 80 95
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4322/26/29-10
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
-40
-30
-20
-10
0
10
20
30
40
50
VCC = 6.5V, VCM = VCC
VCC = 2.7V, VCM = VEE
VCC = 2.7V, VCM = VCC
VCC = 6.5V, VCM = VEE
_____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0V, VCM = VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.)
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 7
1.2
1.3
1.5
1.4
1.6
1.7
1.8
1.9
-40 -25 -10 5 20 35 50 65 80 95
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
MAX4322/26/29-20
TEMPERATURE (°C)
MINIMUM OPERATING VOLTAGE (V)
10 100k10k
FREQUENCY (Hz)
100 1k
0.040
0
0.005
0.010
0.015
0.020
0.025
0.030
0.035
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4322/26/29-21
THD + N (%)
AV = +1
2VP-P SIGNAL
500kHz LOWPASS FILTER
RL = 10kΩ TO VCC/2
0.1
0.001
4.0 4.44.2 5.04.84.6
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
MAX4322/26/29-22
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
THD + N (%)
0.01
AV = +1
10kHz SINE WAVE
RL TO VCC/2
500kHz LOWPASS FILTER
RL = 10kΩRL = 100kΩ
RL = 2kΩ
RL = 250Ω
IN
200ns/div
VOLTAGE (50mV/div)
OUT
AV = +1
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4322/26/29-23
IN
200ns/div
VOLTAGE (50mV/div)
OUT
AV = -1
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4322/26/29-24
125
75
-40 -25 -10 5 20 35 50 65 80 95
LARGE-SIGNAL GAIN
vs. TEMPERATURE
85
115
MAX4322/26/29-19
TEMPERATURE (°C)
GAIN (dB)
105
95
80
90
120
110
100
VOUT(P-P) = VCC - 600mV
RL = 100kΩ
VCC = 6.5V, RL TO VEE
VCC = 2.7V, RL TO VCC
VCC = 2.7V, RL TO VEE
VCC = 6.5V, RL TO VCC
IN
2µs/div
VOLTAGE (2V/div)
OUT
AV = +1
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4322/26/29-25
IN
2µs/div
VOLTAGE (2V/div)
OUT
AV = -1
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4322/26/29-26
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
8 _______________________________________________________________________________________
Pin Description
PIN
MAX4322 MAX4323 MAX4327
SOT23 SO/µMAX SOT23 SO/µMAX UCSP
MAX4326
µMAX SO
MAX4329
NAME FUNCTION
1616A2——
——OUT Output
2424A144
411V
EE
Negative Supply.
Ground for single-
supply operation.
3—33B1——
——IN+ Noninverting Input
4—42B2——
——IN- Inverting Input
5 7 6 7 A3 8 10 14 4 VCC Positive Supply
—1, 5, 8 —1, 5 —— —
5, 7,
8 , 10 —N.C. No Connection. Not
internally connected.
——58B3———SHDN
Shutdown Control.
Connected high or
leave floating to
enable amplifier.
——
———1, 7 1, 9 1, 13 1, 7 OUT1,
OUT2
Outputs for Amps 1
and 2
—2———2, 6 2, 8 2, 12 2, 6 IN1-, IN2- Inverting Inputs for
Amps 1 and 2
—3———3, 5 3, 7 3, 11 3, 5 IN1+,
IN2+
Noninverting Inputs
for Amps 1 and 2
——
————
5, 6 5, 9 —SHDN1,
SHDN2
Shutdown Control for
Amps 1 and 2.
Connected high or
leave floating to
enable amplifier.
——
———— ——8, 14 OUT3,
OUT4
Outputs for Amps 3
and 4
——
———— ——9, 13 IN3-, IN4- Inverting Inputs for
Amps 3 and 4
——
———— ——10, 12 IN3+,
IN4+
Noninverting Inputs
for Amps 3 and 4
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 9
R3
R3 = R1 R2
R1 R2
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
Figure 1a. Reducing Offset Error Due to Bias Current
(Noninverting)
R3
R3 = R1 R2
R1 R2
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
Figure 1b. Reducing Offset Error Due to Bias Current
(Inverting)
1kΩ
1kΩ
Figure 2. Input Protection Circuit
__________
Applications Information
Rail-to-Rail Input Stage
Devices in the MAX4322/MAX4323/MAX4326/MAX4327/
MAX4329 family of high-speed amplifiers have rail-to-
rail input and output stages designed for low-voltage,
single-supply operation. The input stage consists of
separate NPN and PNP differential stages, which com-
bine to provide an input common-mode range extend-
ing 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 250µV. The
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 cur-
rents flowing through external source impedances,
match the effective impedance seen by each input
(Figures 1a, 1b). High-source impedances, together
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/MAX4329s’
inputs are protected from large differential input voltages
by 1kΩseries resistors and back-to-back triple diodes
across the inputs (Figure 2). For differential input volt-
ages less than 1.8V, the input resistance is typically
500kΩ. For differential input voltages greater than 1.8V,
the input resistance is approximately 2kΩ, and the input
bias current is determined by the following equation:
Figure 3. Rail-to-Rail Input/Output Voltage Range Figure 4. Capacitive-Load Stability
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
10 ______________________________________________________________________________________
IN
400ns/div
VOLTAGE (50mV/div)
OUT
AV = +1
CL = 500pF
Figure 5. Small-Signal Transient Response with
Capacitive Load
IN
400ns/div
VOLTAGE (50mV/div)
OUT
AV = +1
CL = 1000pF
RS = 39Ω
Figure 6. Transient Response to Capacitive Load with
Isolation Resistor
IN
2µs/div
VOLTAGE (1V/div)
OUT
VCC = 3V
AV = +1
10,000
100
100 1k 100k10k
RESISTIVE LOAD (Ω)
CAPACITIVE LOAD (pF)
1000
UNSTABLE
REGION
RL TO VEE
VOUT = VCC / 2
Rail-to-Rail Output Stage
The minimum output voltage is 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 to
2.90V. The maximum output voltage swing depends on
the load, but is within 350mV of a 5V supply, even with
the maximum load (500Ωto ground).
Driving a capacitive load can cause instability in most
high-speed op amps, especially those with low quies-
cent current. The MAX4322/MAX4323/MAX4326/
MAX4327/MAX4329 have a high tolerance for capaci-
tive 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 iso-
lation resistor in series with the output (Figure 7). The
resistor improves the circuit’s phase margin by isolat-
ing the load capacitor from the op amp’s output.
Power-Up and Shutdown Mode
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
amplifiers typically settle within 1µs after power-up.
I = V - 1.8V
2k
BIAS DIFF
Ω
Figures 9 and 10 show the output voltage and supply
current on power-up of the test circuit in Figure 8.
The MAX4323 and MAX4327 have a shutdown option.
When shutdown (SHDN) is pulled low, the supply cur-
rent drops to 25µA per amplifier and the amplifiers are
disabled with the outputs in a high-impedance state.
Pulling SHDN high or leaving it floating (1µA internal
pullup) enables the amplifier. In the dual-amplifier
MAX4327, the shutdown functions operate indepen-
dently. Figures 11 and 12 show the output voltage and
supply current responses of the MAX4323 to a shut-
down 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 0.1µF
ceramic capacitor in parallel with at least 1µF. 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 compo-
nents close to the op amp.
UCSP Information
Layout Issues
Design the layout for the device to be as compact as
possible to minimize parasitics. The UCSP uses a
bump pitch of 0.5mm (19.7mil) and a bump diameter of
0.33mm (~12mil). Therefore, lay out the solder-pad
spacing on 0.5mm (19.7mil) centers, using a pad size
of 0.25mm (~10mil) and a solder mask opening of
0.33mm (13mil). Round or square pads are permissi-
ble. Connect multiple vias from the ground plane as
close to the ground connections as possible.
Install capacitors as close as possible to the device
supply voltage input. Place the ground end of these
capacitors near the ground plane to provide a low-
impedance return path for the signal current.
Prototype Chip Installation
Alignment keys on the PC board, around the area
where the chip is located, are helpful in the prototype
assembly process. It is better to align the chip on the
board before any other components are placed, and
then place the board on a hot plate or hot surface until
the solder starts melting. Remove the board from the
hot plate without disturbing the position of the chip and
let it cool down to room temperature before processing
the board further.
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 11
AAA
AAA
ORIENTATION
PRODUCT ID CODE
LOT CODE
TOP VIEW
(BUMPS ON BOTTOM)
A2A1 A3
MAX4323EBT (UCSP) Marking Information
RS
CL
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
Figure 7. Capacitive-Load-Driving Circuit
VOUT
0 TO 2.7V
STEP FOR
POWER-UP
TEST
SUPPLY-CURRENT
MONITORING POINT
VCC
10Ω2kΩ10kΩ
2kΩ
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
Figure 8. Power-Up Test Circuit
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
12 ______________________________________________________________________________________
Figure 11. Shutdown Output Voltage
Figure 10. Power-Up Supply Current
VCC
5µs/div
VOLTAGE (1V/div)
OUT
Figure 9. Power-Up Output Voltage
VCC
1V/div
5µs/div
ICC
500µA/div
SHDN
1V/div
2µs/div
OUT
0.5V/div
VCC = 2.7V
RL = 10kΩ
SHDN
1V/div
2µs/div
ICC
500µA/div
VCC = 2.7V
Figure 12. Shutdown Enable/Disable Supply Current
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 13
TOP VIEW
VEE
IN-
IN+
15VCC
OUT
MAX4322
SOT23-5
2
34
IN2-
IN1+
IN2+
VEE
1
2
8
7
VCC
OUT2
IN1-
OUT1
MAX4326
SO/µMAX
3
4
6
5
OUT
IN1+
N.C.
VEE
1
2
8
7
N.C.
VCC
IN1-
N.C.
MAX4322
SO/µMAX
3
4
6
5
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUT4
IN4-
IN4+
VEE
VCC
IN1+
IN1-
OUT1
MAX4329
IN3+
IN3-
OUT3
OUT2
IN2-
IN2+
SO
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VCC
OUT2
IN2-
IN2+
VEE
IN1+
IN1-
OUT1
MAX4327
N.C.
SHDN2
N.C.
N.C.
SHDN1
N.C.
SO
OUT
IN1+
N.C.
VEE
1
2
8
7
SHDN
VCC
IN1-
N.C.
MAX4323
SO/µMAX
3
4
6
5
1
2
3
4
5
10
9
8
7
6
VCC
OUT2
IN2-
IN2+VEE
IN1+
IN1-
OUT1
MAX4327
µMAX
SHDN2SHDN1
VEE
IN-
IN+
16VCC
OUT
MAX4323
SOT23
2
34
SHDN
5
Pin Configurations (continued)
Ordering Information (continued)
PART TEMP
RANGE
PIN/BUMP-
PACKAGE
TOP
MARK
MAX4323EBT-T* -40oC to +85oC 6 UCSP-6 AAW
MAX4323EUT-T -40oC to +85oC 6 SOT23-6 AAEC
MAX4323EUA -40oC to +85oC 8 µMAX —
MAX4323ESA -40oC to +85oC 8 SO —
MAX4326EUA -40oC to +85oC 8 µMAX —
MAX4326ESA -40oC to +85oC 8 SO —
MAX4327EUB -40oC to +85oC 10 µMAX —
MAX4327ESD -40oC to +85oC 14 SO —
MAX4329ESD -40oC to +85oC 14 SO —
UCSP Reliability
The UCSP represents a unique packaging form factor
that may not perform as well as a packaged product
through traditional mechanical reliability tests. UCSP
reliability is integrally linked to the user's assembly
methods, circuit board material, and usage environ-
ment. The user should closely review these areas when
considering use of a UCSP.
Performance through operating-life test and moisture
resistance remains uncompromised. The wafer-fabrica-
tion process primarily determines the performance.
Mechanical stress performance is a greater considera-
tion for UCSPs. UCSPs are attached through direct sol-
der contact to the user's PC board, foregoing the
inherent stress relief of a packaged product lead frame.
Solder-joint contact integrity must be considered.
Comprehensive reliability tests have been performed
and are available upon request. In conclusion, the
UCSP performs reliably through environmental stresses.
*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. See the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
14 ______________________________________________________________________________________
Chip Information
MAX4322 TRANSISTOR COUNT: 170
MAX4323 TRANSISTOR COUNT: 170
MAX4326 TRANSISTOR COUNT: 340
MAX4327 TRANSISTOR COUNT: 340
MAX4329 TRANSISTOR COUNT: 680
PROCESS: Bipolar
SUBSTRATE CONNECTED TO VEE
Typical Operating Circuit
MAX187
MAX4322
SHDN
31
2
4
5
6
8
7
VDD
+5V
AIN
VREF
GND
DOUT
SERIAL
INTERFACE SCLK
CS
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
10LUMAX.EPS
PACKAGE OUTLINE, 10L uMAX/uSOP
1
1
21-0061 I
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
1
0.498 REF
0.0196 REF
S
6∞
SIDE VIEW
α
BOTTOM VIEW
0∞0∞6∞
0.037 REF
0.0078
MAX
0.006
0.043
0.118
0.120
0.199
0.0275
0.118
0.0106
0.120
0.0197 BSC
INCHES
1
10
L1
0.0035
0.007
e
c
b
0.187
0.0157
0.114
H
L
E2
DIM
0.116
0.114
0.116
0.002
D2
E1
A1
D1
MIN
-A
0.940 REF
0.500 BSC
0.090
0.177
4.75
2.89
0.40
0.200
0.270
5.05
0.70
3.00
MILLIMETERS
0.05
2.89
2.95
2.95
-
MIN
3.00
3.05
0.15
3.05
MAX
1.10
10
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
H
4X S
e
D2
D1
b
A2 A
E2
E1 L
L1
c
α
GAGE PLANE
A2 0.030 0.037 0.75 0.95
A1
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 15
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
6L, UCSP.EPS
SOT5L.EPS
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
16 ______________________________________________________________________________________
6LSOT.EPS
8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036 J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2 A1
c
eb
A
L
FRONT VIEW SIDE VIEW
E H
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
1
TOP VIEW
D
8
A2 0.030
BOTTOM VIEW
16∞
S
b
L
H
E
D
e
c
0∞
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6∞0∞
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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 ____________________ 17
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041 B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
eBA1
A
D
0∞-8∞
L
1
VARIATIONS:
MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Maxim Integrated:
MAX4322ESA MAX4322ESA+ MAX4322ESA+T MAX4322EUA+ MAX4322EUA+T MAX4322EUK+T
MAX4322EUK-T MAX4323ESA MAX4323ESA+ MAX4323ESA+T MAX4323EUA MAX4323EUT+T MAX4323EUT-T
MAX4326ESA MAX4326ESA+ MAX4326ESA+T MAX4326EUA+ MAX4326EUA+T MAX4327ESD MAX4327EUB
MAX4327EUB+ MAX4327EUB+T MAX4323EUA-T MAX4327ESD-T MAX4322ESA-T MAX4323ESA-T
MAX4326ESA-T MAX4327EUB-T MAX4323EBT+T