MAX4323EUA [MAXIM]
Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps; 单/双/四路，低成本， SOT23封装，低功耗，轨到轨输入/输出运算放大器
| 型号： | MAX4323EUA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps |
| 文件： | 总12页 (文件大小：227K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1380; Rev 2a; 12/99
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
General Description
____________________________Features
ꢀ SOT23 Packages (MAX4322/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
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 require only 650µA
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 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.
ꢀ 650µA Quiescent Current per Amplifier
ꢀ 700µV Offset Voltage
ꢀ No Phase Reversal for Overdriven Inputs
ꢀ Drive 250Ω Loads
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 MAX4322/MAX4323 are available in
space-saving SOT23 packages.
ꢀ 25µA Shutdown Mode (MAX4323/MAX4327)
ꢀ Unity-Gain Stable for Capacitive Loads
up to 500pF
Ordering Information
Selector Guide
PIN-
PACKAGE
TOP
MARK
PART
TEMP. RANGE
BW NO. OF
(MHz) AMPS
PIN-
PACKAGE
MAX4322EUK-T
-40°C to +85°C
-40°C to +85°C
5 SOT23-5
8 SO
ACGE
—
PART
SHUTDOWN
MAX4322ESA
MAX4322EUA -40°C to +85°C
MAX4323ESA -40°C to +85°C
MAX4323EUA -40°C to +85°C
MAX4323EUT -40°C to +85°C
MAX4326EUA -40°C to +85°C
MAX4326ESA -40°C to +85°C
MAX4327EUB -40°C to +85°C
MAX4327ESD -40°C to +85°C
MAX4329ESD -40°C to +85°C
8 µMAX
8 SO
—
5 SOT23-5,
8 µMAX/SO
MAX4322
MAX4323
5
5
1
1
—
—
8 µMAX
6 SOT23-6
8 µMAX
8 SO
—
8 µMAX/SO/
6 SOT23-6
AAEC
—
Yes
MAX4326
MAX4327
MAX4329
5
5
5
2
2
4
8 µMAX/SO
10 µMAX, 14 SO
14 SO
—
Yes
—
—
10 µMAX
14 SO
—
—
14 SO
—
________________________Applications
Typical Operating Circuit
Battery-Powered Instruments
Portable Equipment
+5V
Data-Acquisition Systems
Signal Conditioning
MAX187
1
3
6
V
SHDN
DOUT
DD
Low-Power, Low-Voltage Applications
2
4
5
AIN
MAX4322
SERIAL
INTERFACE
Pin Configurations appear at end of data sheet.
8
7
SCLK
CS
VREF
GND
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
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V -V ) ..................................................+7.5V
Operating Temperature Range
CC EE
All Other Pins ...................................(V
Output Short-Circuit Duration.....................................Continuous
+ 0.3V) to (V - 0.3V)
MAX432_E__ ....................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
EE
(short to either supply)
Continuous Power Dissipation (T = +70°C)
A
5-pin SOT23-5 (derate 7.1mW/°C above +70°C) .........571mW
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
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—T = +25°C
A
(V
CC
= +5.0V, V = 0, V
= 0, V
= V
/ 2, SHDN = V
R tied to V
L
/ 2, unless otherwise noted.)
CC
EE
OUT
CC
CM
CC,
PARAMETER
CONDITIONS
MIN
TYP
MAX
2.0
UNITS
MAX432_ESA/MAX4327ESD
All other packages
0.7
1.2
50
V
=
, V
CM
Input Offset Voltage
mV
V
EE CC
2.50
150
12
Input Bias Current
Input Offset Current
V
= V , V
nA
nA
kΩ
CM
CM
EE CC
V
= V , V
1
EE CC
Differential Input Resistance
-1.5V < V
< 1.5V
500
DIFF
Common-Mode Input
Voltage Range
Inferred from CMRR test
V
EE
V
V
CC
V
V
V
≤
CM
CC
EE
MAX432_ESA/MAX4327ESD
All other packages
62
94
91
Common-Mode Rejection Ratio
≤
dB
60
66
Power-Supply Rejection Ratio
Output Resistance
V
= 2.4V to 6.5V
100
0.1
106
86
dB
CC
A = +1V/V
Ω
V
V
V
= 0.25V to 4.75V, R = 100kΩ
L
OUT
OUT
Large-Signal Voltage Gain
dB
= 0.4V to 4.6V, R = 250Ω
70
L
2
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
DC ELECTRICAL CHARACTERISTICS—T = +25°C (continued)
A
CC,
(V
CC
= +5V, V = 0, V
= 0, V
= V
/ 2, SHDN = V
R tied to V / 2, unless otherwise noted.)
EE
OUT
CC
L
CC
CM
PARAMETER
CONDITIONS
R = 100kΩ
MIN
TYP
12
MAX
UNITS
V
V
V
V
V
V
V
V
- V
CC
OL
CC
OL
CC
OL
CC
OL
OH
L
- V
- V
20
EE
MAX4322/
MAX4323
200
100
15
300
200
OH
EE
R = 250Ω
L
- V
- V
Output Voltage Swing
mV
OH
EE
R = 100kΩ
L
MAX4326/
MAX4327/
MAX4329
- V
- V
25
220
120
50
350
250
OH
EE
R = 250Ω
L
- V
Output Short-Circuit Current
SHDN Logic Threshold
SHDN Input Current
mA
V
Low
High
0.8
MAX4323/MAX4327
2.0
2.4
MAX4323/MAX4327
1
4
µA
V
Operating Supply-Voltage Range
Inferred from PSRR test
6.5
V
V
V
V
= 2.4V
= 5V
650
725
25
CC
CC
CC
CC
Supply Current per Amplifier
V
= V
= V / 2
CC
µA
µA
CM
OUT
1100
60
= 2.4V
= 5V
Shutdown Supply Current
per Amplifier
SHDN > 0.8V, MAX4323/MAX4327
40
DC ELECTRICAL CHARACTERISTICS—T = -40°C to +85°C
A
CC,
(V
CC
= +5V, V = 0, V
= 0, V
= V
/ 2, SHDN = V
R tied to V
/ 2, unless otherwise noted.) (Note 1)
EE
OUT
CC
L
CC
CM
PARAMETER
Input Offset Voltage
CONDITIONS
MIN
TYP
MAX
3.0
UNITS
MAX432_ESA/MAX4327ESD
All other packages
V
=
, V
CM
mV
V
EE CC
6.0
Input Offset Voltage Tempco
Input Bias Current
2
µV/°C
nA
V
= V , V
180
20
CM
EE CC
Input Offset Current
V
CM
= V , V
nA
EE CC
Common-Mode Input
Voltage Range
Inferred from CMRR test
V
V
CC
V
EE
V
V
V
≤
CM
CC
EE
MAX432_ESA/MAX4327ESD
All other packages
59
54
Common-Mode Rejection Ratio
≤
dB
_______________________________________________________________________________________
3
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
DC ELECTRICAL CHARACTERISTICS —T = -40°C to +85°C (continued)
A
CC,
(V
CC
= +5V, V = 0, V
= 0, V
= V
/ 2, SHDN = V
R tied to V
/ 2, unless otherwise noted.) (Note 1)
EE
OUT
CC
L
CC
CM
PARAMETER
CONDITIONS
MIN
62
TYP
MAX
UNITS
dB
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
V
V
= 2.4V to 6.5V
CC
= 0.4V to 4.6V, R = 250Ω
66
dB
OUT
L
V
V
- V
350
250
CC
OH
MAX4322/
MAX4323
R = 250Ω
L
- V
- V
OL
EE
Output Voltage Swing
mV
MAX4326/
MAX4327/
MAX4329
V
400
CC
OL
OH
EE
R = 250Ω
L
V
- V
300
0.8
Low
High
MAX4323/MAX4327
MAX4323/MAX4327
V
SHDN Logic Threshold
SHDN Input Current
2.0
2.4
5
6.5
1.2
µA
V
Operating Supply-Voltage Range
Supply Current per Amplifier
V
= V
/ 2
mA
CM
CC
Shutdown Supply Current
per Amplifier
70
µA
SHDN ≤ 0.8V, MAX4323/MAX4327
AC ELECTRICAL CHARACTERISTICS
(V
= +5V, V = 0, V
= V
= V / 2, SHDN = V
T = +25°C unless otherwise noted.)
CC,
A
CC
EE
CM
OUT
CC
PARAMETER
CONDITIONS
MIN
TYP
5
MAX
UNITS
MHz
degrees
dB
Gain-Bandwidth Product
Phase Margin
64
Gain Margin
12
Total Harmonic Distortion
Slew Rate
f = 10kHz, V
= 2Vp-p, A = +1V/V
V
0.003
2
%
OUT
V/µs
µs
Settling Time to 0.01%
Turn-On Time
A = +1V/V, V
V
= 2V step
2.0
1
OUT
V
= 0 to 3V step
µs
CC
Enable
Disable
1
MAX4323/MAX4327
µs
SHDN Delay
0.2
3
Input Capacitance
pF
nV/√Hz
pA
Input Noise Voltage Density
Input Noise Current Density
Amp-Amp Isolation
f = 1kHz
f = 1kHz
22
0.4
135
250
dB
Capacitive Load Stability
A = +1V/V
V
pF
Note 1: All devices are 100% tested at T = +25°C. All temperature limits are guaranteed by design.
A
4
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V = 0, V
= V / 2, SHDN = V
T = +25°C, unless otherwise noted.)
A
EE
CM
CC
CC,
GAIN AND PHASE vs. FREQUENCY
POWER-SUPPLY REJECTION
vs. FREQUENCY
(WITH C
)
GAIN AND PHASE vs. FREQUENCY
LOAD
MAX4322/26/29-02
MAX4322/26/29-01
60
180
144
180
144
60
A = +1
0
-20
-40
V
40
20
0
108
72
108
72
40
20
0
GAIN
GAIN
36
36
0
0
-60
-80
-36
-72
-108
-144
-36
-72
-108
-144
PHASE
PHASE
A = +1000
V
-20
-20
A = +1000
V
NO LOAD
R = ∞
L
C = 500pF
L
-100
-180
-40
100
-40
100
-180
1k
10k 100k
1M 10M 100M
1k
10k
100k 1M 10M 100M
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4323/MAX4327
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4326/MAX4327/MAX4329
CHANNEL SEPARATION vs. FREQUENCY
100
60
50
40
30
130
A = +1
V
120
110
100
90
V
= 6.5V
CC
10
1
0.1
V
= 2.7V
CC
80
70
60
20
10
SHDN = 0V
0
0.01
50
100
1k
10k
100k
1M
10M
100
1k
10k 100k
1M 10M
100M
-40 -25 -10
5
20 35 50 65 80 95
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
3.00
50
40
900
850
800
750
700
SOT23-5/6
PACKAGE
2.25
V
= 2.7V
CC
30
20
10
0
1.50
0.75
0
V
= 6.5V
V
V
= 6.5V
= 2.7V
CC
CC
CC
-10
-0.75
650
600
550
-20
-30
-1.50
-2.25
-3.00
SO PACKAGE
-40
-50
500
-40 -25 -10
5
20 35 50 65 80 95
0
1
2
3
4
5
6
-40 -25 -10
5
20 35 50 65 80 95
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_____________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V = 0, V
= V / 2, SHDN = V
T = +25°C, unless otherwise noted.)
A
EE
CM
CC
CC,
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
COMMON-MODE REJECTION
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
250
200
150
100
50
40
120
115
110
105
100
R TO V
L
CC
V
= 6.5V, V = V
CM CC
CC
30
V
= 6.5V, R = 500Ω
CC
L
V
= 2.7V, V = V
CM CC
CC
20
V
= 0 TO 5.0V
CM
10
0
V
= 2.7V, R = 500Ω
CC
L
-10
-20
-30
-40
-50
-60
95
90
85
V = -0.2V TO 5.2V
CM
V
= 2.7V, V = V
CM
CC
EE
50
0
V
= 6.5V, R = 100kΩ
CC L
V
= 6.5V, V = V
CM
CC
EE
V
= 2.7V, R = 100kΩ
L
CC
80
-40 -25 -10
5
20 35 50 65 80 95
-40 -25 -10
5
20 35 50 65 80 95
-40 -25 -10
5
20 35 50 65 80 95
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAXIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
120
110
100
90
120
110
100
90
300
250
200
150
V
= 2.7V
V
= 6.5V
CC
CC
R TO V
L
EE
R = 100kΩ
L
R TO V
L
R TO V
L
EE
EE
V
= 6.5V, R = 500Ω
L
CC
R = 100kΩ
L
R = 10kΩ
L
R = 10kΩ
L
R = 2kΩ
L
R = 2kΩ
L
V
= 2.7V, R = 500Ω
CC
L
R = 500Ω
L
80
80
100
50
R = 500Ω
L
V
= 6.5V, R = 100kΩ (TOP)
L
CC
70
70
V
= 2.7V, R = 100kΩ (BOTTOM)
L
CC
60
60
0
0
100
200
300
400
500
600
0
100
200
300
400
500
600
-40 -25 -10
5
20 35 50 65 80 95
OUTPUT VOLTAGE: FROM V (mV)
CC
OUTPUT VOLTAGE: FROM V (mV)
CC
TEMPERATURE (°C)
LARGE-SIGNAL GAIN
vs. TEMPERATURE
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
120
110
100
90
120
110
100
90
125
120
115
110
105
V
= 6.5V
CC
R = 500Ω
OUT
R = 100kΩ
V
= 2.7V
CC
L
V
= 6.5V,
L
CC
R TO V
L
CC
R TO V
L
R = 100kΩ
L
V
(p-p) = V - 1V
CC
R TO V
L
CC
EE
R = 10kΩ
L
R = 10kΩ
L
V
= 2.7V,
CC
R TO V
L
R = 2kΩ
L
EE
R = 2kΩ
L
100
95
R = 500Ω
L
R = 500Ω
L
V
= 6.5V, R TO V
CC
CC
L
80
80
90
85
80
75
70
70
V
= 2.7V, R TO V
L CC
CC
60
60
-40 -25 -10
5
20 35 50 65 80 95
0
100
200
300
400
500
600
0
100
200
300
400
500
600
TEMPERATURE (°C)
OUTPUT VOLTAGE: FROM V (mV)
OUTPUT VOLTAGE: FROM V (mV)
EE
EE
6
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
_____________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V = 0, V
= V / 2, SHDN = V
T = +25°C, unless otherwise noted.)
A
EE
CM
CC
CC,
LARGE-SIGNAL GAIN
vs. TEMPERATURE
TOTAL HARMONIC DISTORTION
AND NOISE vs. FREQUENCY
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
1.9
125
0.040
0.035
0.030
0.025
0.020
V
= 6.5V, R TO V
L EE
CC
A
= +1
2Vp-p SIGNAL
500kHz LOWPASS FILTER
V
120
115
110
105
1.8
1.7
V
= 6.5V, R TO V
L CC
CC
R = 10kΩ TO V / 2
L
CC
1.6
1.5
1.4
1.3
1.2
100
95
V
= 2.7V, R TO V
L EE
CC
0.015
0.010
0.005
V
= 2.7V, R TO V
L CC
CC
90
85
80
75
V
(p-p) = V - 600mV
CC
R = 100kΩ
OUT
L
0
10
100
1k
FREQUENCY (Hz)
10k
100k
-40 -25 -10
5
20 35 50 65 80 95
-40 -25 -10
5
20 35 50 65 80 95
TEMPERATURE (°C)
TEMPERATURE (°C)
TOTAL HARMONIC DISTORTION AND NOISE
vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
0.1
A
V
= +1
A
= +1
A
= -1
V
V
10kHz SINE WAVE
R TO V / 2
L
CC
500kHz LOWPASS FILTER
IN
IN
R = 2kΩ
L
0.01
R = 250Ω
L
OUT
OUT
R = 100kΩ
L
R = 10kΩ
L
0.001
4.0
4.2
4.4
4.6
4.8
5.0
TIME (200ns/div)
TIME (200ns/div)
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
A
= +1
A
= -1
V
V
IN
IN
OUT
OUT
TIME (2µs/div)
TIME (2µs/div)
_______________________________________________________________________________________
7
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
Pin Description
PIN
NAME
FUNCTION
MAX4322
MAX4323
MAX4327
MAX4326
MAX4329
SOT23-5 SO/µMAX SOT23-6 SO/µMAX
µMAX
SO
1
2
6
4
1
2
6
4
—
4
—
—
—
OUT
Output
Negative Supply. Ground for
single-supply operation.
4
4
11
V
EE
3
4
5
—
—
7
3
4
6
—
—
7
—
—
8
—
—
10
—
—
14
—
—
4
IN+
IN-
Noninverting Input
Inverting Input
V
CC
Positive Supply
5, 7, 8,
10
—
—
1, 5, 8
—
—
5
1, 5
8
—
—
—
—
—
N.C.
No Connection
Shutdown Control. Tie high or
leave floating to enable
amplifier.
—
SHDN
OUT1,
OUT2
—
—
—
—
2
—
—
—
—
2
1, 7
2, 6
3, 5
1, 9
2, 8
3, 7
1, 13
2, 12
3, 11
1, 7
2, 6
3, 5
Outputs for amps 1 and 2
Inverting Inputs for amps 1
and 2
IN1-, IN2-
Noninverting Inputs for amps
1 and 2
3
3
IN1+, IN2+
Shutdown Control for amps 1
and 2. Tie high or leave float-
ing to enable amplifier.
SHDN1,
SHDN2
—
—
—
—
—
5, 6
5, 9
—
OUT3,
OUT4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8, 14
9, 13
Outputs for amps 3 and 4
Inverting Inputs for amps 3
and 4
IN3-, IN4-
Noninverting Inputs for amps
3 and 4
10, 12 IN3+, IN4+
switchover transition region, which occurs near V
/ 2,
CC
__________Applications Information
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 com-
mon-mode range make these op amps excellent choices
for precision, low-voltage, data-acquisition systems.
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
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
8
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
with the input capacitance, can create a parasitic pole
Rail-to-Rail Output Stage
The minimum output voltage will be within millivolts of
ground for single-supply operation where the load is
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.
referenced to ground (V ). Figure 3 shows the input
EE
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 (500Ω to 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.
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329’s
inputs are protected from large differential input volt-
ages by 1kΩ 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
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:
V
- 1.8V
2kΩ
DIFF
I
=
BIAS
R3
R3
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
R1
R2
R1
R2
R3 = R1 R2
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
_______________________________________________________________________________________
9
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
Power-Up and Shutdown Mode
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
amplifiers typically settle within 1µs after power-up.
Using the test circuit of Figure 8, Figures 9 and 10 show
the output voltage and supply current on power-up.
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.
The MAX4323 and MAX4327 have a shutdown option.
When the shutdown pin (SHDN) is pulled low, the sup-
ply current drops below 25µA per amplifier and the
amplifiers are disabled with the outputs in a high-
impedance state. Pulling SHDN high or leaving it float-
ing 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.
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.
10,000
V
= 3V
CC
A = +1
V
IN
UNSTABLE
REGION
1000
OUT
R TO V
OUT
L
EE
= V /2
CC
V
100
TIME (2µs/div)
100
1k
10k
100k
RESISTIVE LOAD (Ω)
Figure 3. Rail-to-Rail Input /Output Voltage Range
Figure 4. Capacitive-Load Stability
A = +1
L
R = 39Ω
S
V
A = +1
L
V
C = 1000pF
C = 500pF
IN
IN
OUT
OUT
TIME (400ns/div)
TIME (400ns/div)
Figure 5. Small-Signal Transient Response with
Capacitive Load
Figure 6. Transient Response to Capacitive Load with
Isolation Resistor
10 ______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
V
CC
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
0V TO 2.7V
STEP FOR
POWER-UP
TEST
2k
V
R
OUT
S
C
L
MAX4322/MAX4323
MAX4326/MAX4327
MAX4329
SUPPLY-CURRENT
MONITORING POINT
10Ω
10k
2k
Figure 8. Power-Up Test Circuit
Figure 7. Capacitive-Load-Driving Circuit
V
CC
V
CC
(1V/div)
OUT
I
CC
(500µA/div)
TIME (5µs/div)
TIME (5µs/div)
Figure 10. Power-Up Supply Current
Figure 9. Power-Up Output Voltage
V
= 2.7V
V
= 2.7V
CC
CC
R = 10kΩ
L
SHDN
(1V/div)
SHDN
(1V/div)
I
OUT
(0.5V/div)
CC
(500µA/div)
TIME (2µs/div)
TIME (2µs/div)
Figure 12. Shutdown Enable/Disable Supply Current
Figure 11. Shutdown Output Voltage
______________________________________________________________________________________ 11
Single/Dual/Quad, Low-Cost, SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
___________________________________________________________Pin Configurations
TOP VIEW
1
2
3
6
5
4
V
OUT
CC
1
2
3
4
8
7
6
5
SHDN
N.C.
IN1-
IN1+
1
2
3
5
4
1
2
3
4
V
8
7
6
5
N.C.
OUT
N.C.
IN1-
IN1+
CC
V
V
CC
CC
MAX4323
MAX4323
MAX4322
MAX4322
SHDN
IN-
V
EE
V
EE
OUT
N.C.
OUT
N.C.
V
V
EE
EE
IN+
IN+
IN-
SO
SO/µMAX
SOT23-6
SOT23-5
OUT1
OUT1
IN1-
V
OUT4
IN4-
1
2
3
4
5
6
7
1
CC
14
14
13
12
11
10
9
1
2
3
4
8
7
6
5
V
OUT1
IN1-
1
10
V
OUT1
CC
CC
IN1-
IN1+
OUT2
IN2-
2
3
4
5
6
7
13
12
11
10
9
2
3
4
5
9
8
7
6
OUT2
IN2-
OUT2
IN2-
IN1-
IN1+
MAX4326
MAX4327
IN1+
IN4+
IN1+
V
EE
V
CC
IN2+
N.C.
V
EE
MAX4327
MAX4329
V
EE
IN2+
V
IN2+
EE
N.C.
SHDN1
N.C.
IN2+
IN2-
IN3+
IN3-
SHDN1
SHDN2
SHDN2
N.C.
µMAX
SO/µMAX
OUT2
OUT3
8
8
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 V
EE
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
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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