General Description
The LMX321/LMX358/LMX324 are single/dual/quad,
low-cost, low-voltage, pin-to-pin compatible upgrades
to the LMV321/LMV358/LMV324 family of general pur-
pose op amps. These devices offer rail-to-rail outputs
and an input common-mode range that extends below
ground. These op amps draw only 105µA of quiescent
current per amplifier, operate from a single +2.3V to
+7V supply, and drive 2kΩresistive loads to within
40mV of either rail. The LMX321/LMX358/LMX324 are
unity-gain stable with a 1.3MHz gain-bandwidth prod-
uct capable of driving capacitive loads up to 400pF.
The combination of low voltage, low cost, and small
package size makes these amplifiers ideal for
portable/battery-powered equipment.
The LMX321 single op amp is available in ultra-small 5-
pin SC70 and space-saving 5-pin SOT23 packages. The
LMX358 dual op amp is available in the tiny 8-pin SOT23
or the 8-pin µMAX® package. The LMX324 quad op amp
is available in 14-pin TSSOP and SO packages.
Applications
Cellular Phones
Laptops
Low-Power, Low-Voltage Applications
Portable/Battery-Powered Equipment
Cordless Phones
Active Filters
Features
♦Upgrade to LMV321/LMV358/LMV324 Family
♦Single +2.3V to +7V Supply Voltage Range
♦Available in Space-Saving Packages
5-Pin SC70 (LMX321)
8-Pin SOT23 (LMX358)
14-Pin TSSOP (LMX324)
♦1.3MHz Gain-Bandwidth Product
♦ 105µA Quiescent Current per Amplifier
(VCC = +2.7V)
♦No Phase Reversal for Overdriven Inputs
♦No Crossover Distortion
♦Rail-to-Rail Output Swing
♦Input Common-Mode Voltage Range: VEE - 0.2V
to VCC - 0.8V
♦Drives 2kΩResistive Loads
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
________________________________________________________________ Maxim Integrated Products 1
6
SOT23-8/SO/µMAX
TSSOP/SO
VEE
OUT1
IN1+
1
2
3
4
8
IN2-
5IN2+
7OUT2
IN1-
VCC OUT1
IN1+
IN2+
OUT2
IN2-
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IN4+
IN3+
IN3-
OUT3
IN4-
OUT4
IN1-
VCC VEE
LMX324
LMX358
IN+
IN-
1
2
3
5
4OUT
VEE
VCC
LMX321
SC70-5/SOT23-5
TOP VIEW
Pin Configurations
Ordering Information
19-2103; Rev 1; 10/06
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.
Selector Guide appears at end of data sheet.
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
LMX321AXK-T
-40°C to +125°C
5 SC70-5
X5-1
LMX321AUK-T
-40°C to +125°C
5 SOT23-5
U5-1
LMX358AKA-T
-40°C to +125°C
8 SOT23-8
K8-2
LMX358ASA
-40°C to +125°C
8 SO
S8-2
LMX358AUA-T
-40°C to +125°C
8 µMAX-8
U8-1
LMX324ASD
-40°C to +125°C
14 SO
S14-4
LMX324AUD
-40°C to +125°C
14 TSSOP
U14-1
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V, VEE = 0V, VOUT = VCC/2, VCM = 1V, RL> 1MΩ, TA= +25°C, 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 to VEE) ....................................-0.3V to +8V
Differential Input Voltage (VIN+ - VIN-) ........................VEE to VCC
OUT_ to VEE ...............................................-0.3V to (VCC + 0.3V)
Output Short-Circuit Duration
OUT_ Shorted to VCC or VEE..................................Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70-5 (derate 3.1mW/°C above +70°C)...........247mW
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW
8-Pin SOT23-8 (derate 7.52mW/°C above +70°C) ......602mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYM B O L
CONDITIONS MIN
TYP MAX UNITS
DC CHARACTERISTICS
Input Offset Voltage VOS 16mV
Input Offset Voltage Average
Drift
TCVOS
6 µV/oC
Input Bias Current IB18 50 nA
Input Offset Current IOS 18 nA
Common-Mode Rejection
Ratio
CMRR
-0.2V < VCM < 1.8V 72 92 dB
Power-Supply Rejection Ratio PSRR 2.3V
<
VCC
<
7V, VOUT = 1V 82 96 dB
Limit -0.2
+1.8
Input Common-Mode Voltage
Range VCM For CMRR
>
72dB Typ -0.2
+1.9
V
Large-Signal Voltage Gain AVOL RL = 2kΩ to VEE, 0.3V < VOUT < 2.4V 20 120 V/mV
VCC - VOH 12 50
RL = 10kΩ to 1.35V VOL 10 40
VCC - VOH 40 110
Output-Voltage Swing VOUT
RL = 2kΩ to 1.35V VOL 25 60
mV
LMX321 (single) 105 150
LMX358 (dual) 210 300
Supply Current ICC
LMX324 (quad) 420 600
µA
AC CHARACTERISTICS
Slew Rate SR 1V step Input 1 V/µs
Gain-Bandwidth Product GBW CL = 200pF 1.3 MHz
Phase Margin φM64 d egr ees
Gain Margin GM 24 dB
Input Noise-Voltage Density enf = 1kHz 66
nV/√Hz
Input Current-Noise Density inf = 1kHz
0.13 pA/√Hz
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V, VEE = 0V, VOUT = VCC/2, VCM = 1V, RL> 1MΩ, TA= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS MIN TYP MAX
UNITS
DC CHARACTERISTICS
Input Offset Voltage VOS 9mV
Input Bias Current IB70 nA
Input Offset Current IOS 15 nA
Common-Mode Rejection
Ratio CMRR -0.1 < VCM < +1.7V 60 dB
Power-Supply Rejection Ratio PSRR 2.3V
<
VCC
<
7V, VOUT = 1V 75 dB
Limit -0.1 +1.7
Input Common-Mode Voltage
Range VCM For CMRR
>
60dB Typ -0.1 +1.8 V
Large-Signal Voltage Gain AVOL RL = 2kΩ to VEE, 0.3V
<
VOUT
<
2.4V 10
V/mV
VCC - VOH 130
RL = 10kΩ to 1.55V VOL 50
VCC - VOH 150
Output-Voltage Swing VOUT
RL = 2kΩ to 1.35V VOL 70
mV
LMX321 (single) 180
LMX358 (dual) 360
Supply Current ICC
LMX324 (quad) 720
µA
ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0V, VOUT = VCC/2, VCM = 2V, RL> 1MΩ, TA= +25°C, unless otherwise noted.)
PARAMETER
SYM B O L
CONDITIONS MIN TYP MAX
UNITS
DC CHARACTERISTICS
Input Offset Voltage VOS 16mV
Input Offset Voltage Average Drift TCVOS 6 µV/oC
Input Bias Current IB18 50 nA
Input Offset Current IOS 18nA
Input Differential Clamp Voltage VCLAMP
Force 100µA into IN+, IN- =
GND measure VIN+ - VIN-,
Figure 1
3.1 V
Common-Mode Rejection Ratio CMRR -0.2 < VCM < +4.1V 72 92 dB
Power-Supply Rejection Ratio PSRR 2.3V
<
VCC
<
7V, VOUT = 1V,
VCM = 1V 82 96 dB
Limit -0.2 +4.1
Input Common-Mode Voltage
Range VCM For CMRR
>
72dB Typ -0.2 +4.2 V
Large-Signal Voltage Gain AVOL RL = 2kΩ to VEE,
0.3V
<
VOUT
<
4.7V 40 200 V/mV
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0V, VOUT = VCC/2, VCM = 2V, RL> 1MΩ, TA= +25°C, unless otherwise noted.)
PARAMETER
SYM B O L
CONDITIONS MIN TYP MAX
UNITS
VCC - VOH
20 60
RL = 10kΩ to 2.5V
VOL 12 40
VCC - VOH
65 130
Output-Voltage Swing VOUT
RL = 2kΩ to 2.5V VOL 40 80
mV
Sourcing, VOUT = 0V 5 25
Output Short-Circuit Current ISC Sinking, VOUT = 5V 10 28 m A
LMX321 (single) 120 170
LMX358 (dual) 240 340
Supply Current ICC
LMX324 (quad) 480 680
µA
AC CHARACTERISTICS
Slew Rate SR 3V step input 1 V/µs
Gain-Bandwidth Product GBW CL = 200pF 1.3 MHz
Phase Margin φM65
degrees
Gain Margin GM 25 dB
Input Noise-Voltage Density enf = 1kHz 65
nV/√Hz
Input Noise-Current Density inf = 1kHz 0.13
pA/√Hz
Note 1: Specifications are 100% tested at TA= +25°C (exceptions noted). All temperature limits are guaranteed by design.
ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0V, VOUT = VCC/2, VCM = 2V, RL> 1MΩ, TA= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYM B O L
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
Input Offset Voltage VOS 9mV
Input Bias Current IB70 nA
Input Offset Current IOS 15 nA
Common-Mode Rejection Ratio
CMRR
-0.1 < VCM < +4.0V 63 dB
Power-Supply Rejection Ratio PSRR 2.3V
<
VCC
<
7V, VOUT = 1V, VCM = 1V 75 dB
Limit
-0.1 +4.0
Input Common-Mode Voltage
Range VCM For CMRR
>
63dB Typ
-0.1 +4.1
V
Large-Signal Voltage Gain AVOL RL = 2kΩ to VEE, 0.3V
<
VOUT
<
4.7V 20
V/mV
VCC - VOH
170
RL = 10kΩ to 2.5V VOL 70
VCC - VOH
190
Output-Voltage Swing VOUT
RL = 2kΩ to 2.5V VOL 90
mV
LMX321 (single)
210
LMX358 (dual)
420
Supply Current ICC
LMX324 (quad)
840
µA
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
_______________________________________________________________________________________ 5
0
40
20
80
60
100
120
140
160
02314567
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
LMX321 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER (µA)
TA = +125°C
TA = +85°C
TA = +25°C
TA = -40°C
-40 -10 5-25 203550658095110125
INPUT BIAS CURRENT
vs. TEMPERATURE
LMX321 toc02
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
-20
-17
-18
-19
-15
-16
-11
-12
-13
-14
-10
VCC = +5V, VIN = VCC/2
INPUT BIAS CURRENT
vs. DIFFERENTIAL INPUT VOLTAGE
LMX321 toc03
DIFFERENTIAL INPUT VOLTAGE (V)
INPUT BIAS CURRENT (µA)
43-4 -3 -2 0 1-1 2
-300
-200
-100
0
100
200
300
400
-400
-5 5
VCC = 5V
100
10
1
0.1
0.01
0.01 10.1 10
SOURCE CURRENT
vs. OUTPUT VOLTAGE
LMX321 toc04
OUTPUT VOLTAGE REFERENCED TO VCC (V)
SOURCE CURRENT (mA)
VCC = 2.7V
100
10
1
0.1
0.01
0.01 10.1 10
SOURCE CURRENT
vs. OUTPUT VOLTAGE
LMX321 toc05
OUTPUT VOLTAGE REFERENCED TO VCC (V)
SOURCE CURRENT (mA)
VCC = 5V
100
10
1
0.1
0.01
0.001 0.01 10.1 10
SINK CURRENT
vs. OUTPUT VOLTAGE
LMX321 toc06
OUTPUT VOLTAGE REFERENCED TO VEE (V)
SINK CURRENT (mA)
VCC = 2.7V
100
10
1
0.1
0.01
0.001 0.01 10.1 10
SINK CURRENT
vs. OUTPUT VOLTAGE
LMX321 toc07
OUTPUT VOLTAGE REFERENCED TO VEE (V)
SINK CURRENT (mA)
VCC = 5V
20
30
40
50
60
70
80
90
100
243567
OUTPUT VOLTAGE SWING
vs. SUPPLY VOLTAGE
LMX321 toc08
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE SWING (mV)
RL = 2kΩ
POSITIVE SWING
(VCC - VOH)
NEGATIVE SWING (VOL)
5
15
10
25
20
30
35
25634 7
OUTPUT VOLTAGE SWING
vs. SUPPLY VOLTAGE
LMX321 toc09
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE SWING (mV)
RL = 10kΩ
POSITIVE SWING
(VCC - VOH)
NEGATIVE SWING (VOL)
Typical Operating Characteristics
(TA = +25°C, VEE = 0V, unless otherwise noted.)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
6 _______________________________________________________________________________________
0
100
50
150
200
250
300
350
400
450
500
550
600
1 10 100 1k 10k 100k
INPUT VOLTAGE NOISE
vs. FREQUENCY
LMX321 toc10
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/√Hz)
VCC = 2.7V TO 5V, VCM = VCC/2
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1 10 100 1k 10k 100k
INPUT CURRENT NOISE
vs. FREQUENCY
LMX321 toc11
FREQUENCY (Hz)
INPUT CURRENT NOISE (pA/√Hz)
VCC = 2.7V TO 5V, VCM = VCC/2
-150
-110
-130
-70
-90
-50
100 100k 1M1k 10k 10M 100M
CROSSTALK REJECTION
vs. FREQUENCY
LMX321 toc12
FREQUENCY (Hz)
CROSSTALK REJECTION (dB)
VCC = 5V, RL = 5kΩ
-120
-80
-100
-40
-60
-20
0
100 10k1k 100k 1M
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
LMX321 toc13
FREQUENCY (Hz)
PSRR (dB)
VCC = 2.7V TO 5V
PSRR-
PSRR+
-0.20
-0.10
-0.15
0
-0.05
0.05
0.10
-1.7 0.8
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
LMX321 toc14
COMMON-MODE VOLTAGE (V)
∆VOS (mV)
-0.7-1.2 -0.2 0.3
VCC = 1.35V, VEE = -1.35V
-0.20
-0.10
-0.15
0
-0.05
0.10
0.05
0.15
-2.8 -0.8-1.8 0.2 1.2-2.3 -0.3-1.3 0.7 1.7 2.2
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
LMX321 toc15
COMMON-MODE VOLTAGE (V)
∆VOS (mV)
VCC = 2.5V, VEE = -2.5V
-100
-75
-50
-25
0
25
50
75
100
-3 -1-2 0123
INPUT OFFSET VOLTAGE
vs. OUTPUT VOLTAGE
LMX321 toc16
OUTPUT VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
VCC = 2.5V, VEE = -2.5V
100
-75
-50
-25
0
25
50
75
100
-1.5 -0.5-1.0 0 0.5 1.0 1.5
INPUT OFFSET VOLTAGE
vs. OUTPUT VOLTAGE
LMX321 toc17
OUTPUT VOLTAGE (V)
INPUT OFFSET VOLTAGE (mV)
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
VCC = +1.35V, VEE = -1.35V
-20
0
-10
20
10
40
30
50
-40
0
-20
40
20
80
60
100
10k 100k 1M 10M
GAIN AND PHASE vs. FREQUENCY
and RESISTIVE LOAD
LMX321 toc18
FREQUENCY (Hz)
GAIN (dB)
PHASE MARGIN (degrees)
RL = 100kΩ
RL = 100kΩ
VCC = 2.5V, VEE = -2.5V
CL = 0pF, RL TO VEE
AVCL = 60dB, VOUT = 0V
RL = 600Ω
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
_______________________________________________________________________________________ 7
-20
0
-10
20
10
40
30
50
-40
0
-20
40
20
80
60
100
10k 100k 1M 10M
GAIN AND PHASE vs. FREQUENCY
and RESISTIVE LOAD
LMX321 toc19
FREQUENCY (Hz)
GAIN (dB)
PHASE (degrees)
RL = 100kΩ
RL = 600Ω
RL = 600Ω
RL = 100kΩ
VCC = 1.35V, VEE = -1.35V
CL = 0, RL TO VEE
AVCL = 60dB, VOUT = 0V
-20
0
-10
20
10
40
30
50
-40
0
-20
40
20
80
60
100
10k 100k 1M 10M
GAIN AND PHASE vs. FREQUENCY
AND CAPACITIVE LOAD
LMX321 toc20
FREQUENCY (Hz)
GAIN (dB)
PHASE (degrees)
CL = 0
VCC = 2.5V, VEE = -2.5V
RL = 600Ω TO VEE
AVCL = 60dB, VOUT = 0V
CL = 500pF
CL = 1nF
-20
0
-10
20
10
40
30
50
-40
0
-20
40
20
80
60
100
10k 100k 1M 10M
GAIN AND PHASE vs. FREQUENCY
AND CAPACITIVE LOAD
LMX321 toc21
FREQUENCY (Hz)
GAIN (dB)
PHASE (degrees)
CL = 0
VCC = 2.5V, VEE = -2.5V
RL = 100kΩ TO VEE
AVCL = 60dB, VOUT = 0V
CL = 100pF
CL = 500pF
CL = 1nF
CL = 1nF
CL = 500pF
CL = 100pF
CL = 0
-20
0
-10
20
10
40
30
50
-40
0
-20
40
20
80
60
100
10k 100k 1M 10M
GAIN AND PHASE vs. FREQUENCY
AND TEMPERATURE
LMX321 toc22
FREQUENCY (Hz)
GAIN (dB)
PHASE (degrees)
VCC = 2.5V, VEE = -2.5V
RL = 2kΩ TO VEE
AVCL = 60dB, VOUT = 0V
TA = +125°C
TA = -40°C
TA = +25°C
TA = +85°C
TA = -25°C
TA = -40°C
TA = +25°C
TA = +85°C
0
500
1000
1500
2000
2500
3000
3500
4000
100 1k 10k 100k
CAPACITIVE-LOAD STABILITY
MAXLMX toc23
LOAD RESISTANCE (Ω)
LOAD CAPACITANCE (pF)
UNSTABLE
STABLE
0.96
1.00
0.98
1.04
1.02
1.08
1.06
1.10
2.0 3.0 3.52.5 4.0 4.5 5.0 5.5
SLEW RATE vs.
SUPPLY VOLTAGE
LMX321 toc24
SUPPLY VOLTAGE (V)
SLEW RATE (V/µs)
RISING EDGE
FALLING EDGE
RL = 10kΩ
VIN = 1V STEP, AVCL = +1V/V
NONINVERTING
LARGE-SIGNAL RESPONSE
LMX321 toc25
VIN
1V/div
VOUT
1V/div
1µs/div
RL = 2kΩ
VCC = 5V
NONINVERTING
SMALL-SIGNAL RESPONSE
LMX321 toc26
VIN
100mV/div
VOUT
100mV/div
1µs/div
RL = 2kΩ
VCC = 5V
10
1
0.1
0.01
0.001
10 1k100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
LMX321 toc27
FREQUENCY (Hz)
THD+N (%)
VCC = 2.7V, AV = +10, VOUT = 1VP-P
VCC = 5V, AV = +10, VOUT = 2.5VP-P
VCC = 2.7V, AV = +1, VOUT = 1VP-P
VCC = 5V, AV = +1, VOUT = 2.5VP-P
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
8 _______________________________________________________________________________________
Pin Description
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
PIN
LMX321 LMX358 LMX324
NAME FUNCTION
1 — — IN+ Noninverting Amplifier Input
2 4 11 VEE Negative Supply. Connect to ground for single-supply
operation.
3 — — IN- Inverting Amplifier Input
4 — — OUT Output
58 4V
CC Positive Supply
— 1 1 OUT1 Output for Amplifier 1
— 2 2 IN1- Inverting Input for Amplifier 1
— 3 3 IN1+ Noninverting Input for Amplifier 1
— 7 7 OUT2 Output for Amplifier 2
— 6 6 IN2- Inverting Input for Amplifier 2
— 5 5 IN2+ Noninverting Input for Amplifier 2
— — 8 OUT3 Output for Amplifier 3
— — 9 IN3- Inverting Input for Amplifier 3
— — 10 IN3+ Noninverting Input for Amplifier 3
— — 14 OUT4 Output for Amplifier 4
— — 13 IN4- Inverting Input for Amplifier 4
— — 12 IN4+ Noninverting Input for Amplifier 4
-40 -10 5 20-25 35 50 9580 11065 125
SHORT-CIRCUIT CURRENT
vs. TEMPERATURE (SINKING)
LMX321 toc28
TEMPERATURE (°C)
SHORT-CIRCUIT CURRENT (mA)
0
5
15
10
30
35
25
20
40
VCC = 5V
VCC = 2.7V
-40 -10 5 20-25 35 50 9580 11065 125
SHORT-CIRCUIT CURRENT
vs. TEMPERATURE (SOURCING)
LMX321 toc29
TEMPERATURE (°C)
SHORT-CIRCUIT CURRENT (mA)
0
5
15
10
30
35
25
20
40
VCC = 5V
VCC = 2.7V
0.001
0.01
10
1
100
1000
100 10k1k 100k 1M 10M 100M
OUTPUT IMPEDANCE
vs. FREQUENCY
LMX321 toc30
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
VCC = 2.7V TO 5V
AVCL = +1V/V
Detailed Description
Input Protection Circuit
The LMX321/LMX358/LMX324’s inputs are protected
from large differential input voltages by internal 3.5kΩ
series resistors and back-to-back triple diode stacks
across the inputs (Figure 1). For differential input volt-
ages (much less than 1.8V), input resistance is typically
3MΩ. For differential input voltages greater than 1.8V,
input resistance is around 7kΩ, and the input bias cur-
rent can be approximated by the following equation:
IBIAS = (VDIFF - 1.8V) / 7kΩ
In the region where the differential input voltage
approaches 1.8V, input resistance decreases exponen-
tially from 3MΩto 7kΩas the diode block begins con-
ducting. Inversely, the bias current increases with the
same curve.
Rail-to-Rail Output Stage
The LMX321/LMX358/LMX324 drive 2kΩloads and still
typically swing within 40mV of the supply rails. Figure 2
shows the output voltage swing of the LMX321 config-
ured with AVCL = +2V/V.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many
op amps, especially those with low quiescent current.
The LMX321/LMX358/LMX324 are unity-gain stable for
a range of capacitive loads to above 400pF. Figure 4
shows the response of the LMX321 with an excessive
capacitive load. Adding a series resistor between the
output and the load capacitor (Figure 5) improves the
circuit’s response by isolating the load capacitance
from the op amp’s output.
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
_______________________________________________________________________________________ 9
3.5kΩ
3.5kΩ
Figure 1. Input Protection Circuit
200µs/div
2.5V
-2.5V
VOUT
1V/div
VIN
2V/div
VCC = 2.5V, VEE = -2.5V, AVCL = 2V/V
Figure 2. Rail-to-Rail Output Swing
RLCL
LMX321
LMX358
LMX324
Figure 3. Capacitive-Load-Driving Circuit
4µs/div
2.6V
2.4V
2.6V
2.4V
VOUT
100mV/div
VIN
100mV/div
VCC = 5V, VEE = 0V, CL = 2.2nF, RL = 2kΩ
Figure 4. Output With Excessive Capacitive Load
LMX321/LMX358/LMX324
Applications Information
Power-Up
The LMX321/LMX358/LMX324 outputs typically settle
within 10µs after power-up. Figure 6 shows the output
voltage on power-up and power-down.
Power Supplies and Layout
The LMX321/LMX358/LMX324 operate from a single
+2.3V to +7V power supply. Bypass the power supply
with a 0.1µF capacitor to ground as close to VCC as
possible.
Good layout techniques optimize performance by mini-
mizing the amount of stray capacitance at the op
amp’s inputs and outputs. Place external components
close to the op amp to minimize trace lengths and
stray capacitance.
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
10 ______________________________________________________________________________________
Selector Guide
4µs/div
VOUT
1V/div
VCC
2V/div
Figure 6. Power-Up/Power-Down Waveform
PART
AMPLIFIERS PER
PACKAGE TOP MARK
LMX321AXK-T 1 ACP
LMX321AUK-T 1 ADSQ
LMX358AKA-T 2 AAIR
LMX358ASA 2 —
LMX358AUA-T 2 —
LMX324ASD 4 —
LMX324AUD 4 —
RISO
CL
LMX321
LMX358
LMX324
Figure 5. Capacitive-Load-Driving Circuit With Isolation
Resistor
Chip Information
LMX321 TRANSISTOR COUNT: 88
LMX358 TRANSISTOR COUNT: 175
LMX324 TRANSISTOR COUNT: 349
PROCESS: Bipolar
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
______________________________________________________________________________________ 11
SC70, 5L.EPS
PACKAGE OUTLINE, 5L SC70
21-0076
1
1
E
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.)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
12 ______________________________________________________________________________________
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.)
SOT-23 5L .EPS
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
______________________________________________________________________________________ 13
SOT23, 8L .EPS
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.)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
14 ______________________________________________________________________________________
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.)
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
Ø0.50±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
AMIN
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
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
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 ____________________ 15
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
TSSOP4.40mm.EPS
PACKAGE OUTLINE, TSSOP 4.40mm BODY
21-0066
1
1
I
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.)