19-2103; Rev 1; 10/06
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
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 purpose 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 2kΩ resistive loads to within
40mV of either rail. The LMX321/LMX358/LMX324 are
unity-gain stable with a 1.3MHz gain-bandwidth product 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 5pin 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.
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 2kΩ Resistive Loads
Ordering Information
Applications
PINPACKAGE
PKG
CODE
PART
TEMP RANGE
Laptops
LMX321AXK-T
-40°C to +125°C
5 SC70-5
X5-1
Low-Power, Low-Voltage Applications
LMX321AUK-T
-40°C to +125°C
5 SOT23-5
U5-1
Portable/Battery-Powered Equipment
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
Cellular Phones
Cordless Phones
Active Filters
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
IN+ 1
LMX321
5 VCC
VEE 2
4 OUT
IN- 3
SC70-5/SOT23-5
8 VCC
OUT1 1
14 OUT4
IN1- 2
7 OUT2
IN1- 2
13 IN4-
IN1+ 3
6 IN2-
IN1+ 3
12 IN4+
VEE 4
5 IN2+
VCC 4
OUT1 1
LMX358
SOT23-8/SO/µMAX
LMX324
11 VEE
IN2+ 5
10 IN3+
IN2- 6
9 IN3-
OUT2 7
8 OUT3
TSSOP/SO
________________________________________________________________ Maxim Integrated Products
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.
1
LMX321/LMX358/LMX324
General Description
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
ABSOLUTE MAXIMUM RATINGS
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
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V, VEE = 0V, VOUT = VCC/2, VCM = 1V, RL > 1MΩ, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
1
6
mV
TCVOS
6
IB
18
50
nA
IOS
1
8
nA
DC CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Average
Drift
Input Bias Current
Input Offset Current
Common-Mode Rejection
Ratio
CMRR
-0.2V < VCM < 1.8V
Power-Supply Rejection Ratio
PSRR
2.3V < VCC < 7V, VOUT = 1V
-0.2
+1.9
AVOL
RL = 2kΩ to VEE, 0.3V < VOUT < 2.4V
LMX321 (single)
Supply Current
ICC
dB
Typ
Large-Signal Voltage Gain
RL = 2kΩ to 1.35V
96
+1.8
For CMRR > 72dB
RL = 10kΩ to 1.35V
82
dB
-0.2
VCM
VOUT
92
Limit
Input Common-Mode Voltage
Range
Output-Voltage Swing
72
µV/oC
20
120
V/mV
VCC - VOH
12
50
VOL
10
40
VCC - VOH
40
110
VOL
V
25
60
105
150
LMX358 (dual)
210
300
LMX324 (quad)
420
600
mV
µA
AC CHARACTERISTICS
Slew Rate
Gain-Bandwidth Product
SR
GBW
1V step Input
CL = 200pF
1
V/µs
1.3
MHz
degrees
Phase Margin
φM
Gain Margin
GM
24
dB
Input Noise-Voltage Density
en
f = 1kHz
66
nV/√Hz
Input Current-Noise Density
in
f = 1kHz
0.13
pA/√Hz
2
64
_______________________________________________________________________________________
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
LMX321/LMX358/LMX324
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
9
mV
IB
70
nA
IOS
15
nA
DC CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Input Offset Current
Common-Mode Rejection
Ratio
CMRR
-0.1 < VCM < +1.7V
Power-Supply Rejection Ratio
PSRR
2.3V < VCC < 7V, VOUT = 1V
60
75
-0.1
+1.7
Typ
-0.1
+1.8
VCM
For CMRR > 60dB
Large-Signal Voltage Gain
AVOL
RL = 2kΩ to VEE, 0.3V < VOUT < 2.4V
RL = 10kΩ to 1.55V
VOUT
RL = 2kΩ to 1.35V
Supply Current
ICC
dB
Limit
Input Common-Mode Voltage
Range
Output-Voltage Swing
dB
10
V
V/mV
VCC - VOH
130
VOL
50
VCC - VOH
150
mV
70
VOL
LMX321 (single)
180
LMX358 (dual)
360
LMX324 (quad)
720
µA
ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0V, VOUT = VCC/2, VCM = 2V, RL > 1MΩ, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
1
6
mV
TCVOS
6
IB
18
50
nA
IOS
1
8
nA
DC CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Average Drift
Input Bias Current
Input Offset Current
Force 100µA into IN+, IN- =
GND measure VIN+ - VIN-,
Figure 1
µV/oC
3.1
V
72
92
dB
82
96
dB
Input Differential Clamp Voltage
VCLAMP
Common-Mode Rejection Ratio
CMRR
-0.2 < VCM < +4.1V
Power-Supply Rejection Ratio
PSRR
2.3V < VCC < 7V, VOUT = 1V,
VCM = 1V
Input Common-Mode Voltage
Range
VCM
For CMRR > 72dB
Limit
-0.2
+4.1
Typ
-0.2
+4.2
Large-Signal Voltage Gain
AVOL
RL = 2kΩ to VEE,
0.3V < VOUT < 4.7V
40
200
V
V/mV
_______________________________________________________________________________________
3
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0V, VOUT = VCC/2, VCM = 2V, RL > 1MΩ, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
RL = 10kΩ to 2.5V
Output-Voltage Swing
VOUT
RL = 2kΩ to 2.5V
Output Short-Circuit Current
ISC
Supply Current
ICC
TYP
MAX
VCC - VOH
MIN
20
60
VOL
12
40
VCC - VOH
65
130
40
80
VOL
Sourcing, VOUT = 0V
5
25
Sinking, VOUT = 5V
10
28
UNITS
mV
mA
LMX321 (single)
120
170
LMX358 (dual)
240
340
LMX324 (quad)
480
680
µA
AC CHARACTERISTICS
Slew Rate
Gain-Bandwidth Product
SR
3V step input
GBW
1
CL = 200pF
V/µs
1.3
MHz
Phase Margin
φM
65
degrees
Gain Margin
GM
25
dB
Input Noise-Voltage Density
en
f = 1kHz
65
nV/√Hz
Input Noise-Current Density
in
f = 1kHz
0.13
pA/√Hz
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
9
mV
IB
70
nA
IOS
15
nA
DC CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Input Offset Current
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
Input Common-Mode Voltage
Range
VCM
For CMRR > 63dB
Large-Signal Voltage Gain
AVOL
RL = 2kΩ to VEE, 0.3V < VOUT < 4.7V
RL = 10kΩ to 2.5V
Output-Voltage Swing
VOUT
RL = 2kΩ to 2.5V
Supply Current
ICC
Limit
-0.1
+4.0
Typ
-0.1
+4.1
20
VCC - VOH
V/mV
170
VOL
70
VCC - VOH
190
VOL
210
LMX358 (dual)
420
LMX324 (quad)
840
_______________________________________________________________________________________
mV
90
LMX321 (single)
Note 1: Specifications are 100% tested at TA = +25°C (exceptions noted). All temperature limits are guaranteed by design.
4
V
µA
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
TA = +85°C
TA = +25°C
60
40
TA = -40°C
1
2
-16
-17
3
4
5
6
7
100
0
-100
-200
-300
VCC = +5V, VIN = VCC/2
-400
-5
-40 -25 -10 5 20 35 50 65 80 95 110 125
-4
-3
-2
-1
0
1
2
3
DIFFERENTIAL INPUT VOLTAGE (V)
SOURCE CURRENT
vs. OUTPUT VOLTAGE
SOURCE CURRENT
vs. OUTPUT VOLTAGE
SINK CURRENT
vs. OUTPUT VOLTAGE
VCC = 5V
1
0.1
10
SINK CURRENT (mA)
10
100
LMX321 toc05
LMX321 toc04
100
1
0.1
0.01
0.1
1
10
VCC = 2.7V
10
1
0.01
0.1
1
0.01
0.001
10
0.01
0.1
1
10
OUTPUT VOLTAGE REFERENCED TO VCC (V)
OUTPUT VOLTAGE REFERENCED TO VEE (V)
SINK CURRENT
vs. OUTPUT VOLTAGE
OUTPUT VOLTAGE SWING
vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE SWING
vs. SUPPLY VOLTAGE
1
0.1
80
POSITIVE SWING
(VCC - VOH)
70
60
50
40
30
0.01
0.1
1
10
RL = 10kΩ
30
POSITIVE SWING
(VCC - VOH)
25
20
15
10
NEGATIVE SWING (VOL)
NEGATIVE SWING (VOL)
20
OUTPUT VOLTAGE REFERENCED TO VEE (V)
35
LMX321 toc09
LMX321 toc08
RL = 2kΩ
90
OUTPUT VOLTAGE SWING (mV)
10
100
OUTPUT VOLTAGE SWING (mV)
LMX321 toc07
OUTPUT VOLTAGE REFERENCED TO VCC (V)
VCC = 5V
5
0.1
0.01
0.01
4
LMX321 toc06
TEMPERATURE (°C)
VCC = 2.7V
0.01
0.001
200
SUPPLY VOLTAGE (V)
SOURCE CURRENT (mA)
SOURCE CURRENT (mA)
-15
-20
0
SINK CURRENT (mA)
-14
-19
0
100
-13
-18
20
100
-12
VCC = 5V
300
INPUT BIAS CURRENT (µA)
100
80
-11
INPUT BIAS CURRENT (nA)
120
400
LMX321 toc02
TA = +125°C
140
-10
LMX321 toc01
SUPPLY CURRENT PER AMPLIFIER (µA)
160
INPUT BIAS CURRENT
vs. DIFFERENTIAL INPUT VOLTAGE
INPUT BIAS CURRENT
vs. TEMPERATURE
LMX321 toc03
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
5
2
3
4
5
SUPPLY VOLTAGE (V)
6
7
2
3
4
5
6
7
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
LMX321/LMX358/LMX324
Typical Operating Characteristics
(TA = +25°C, VEE = 0V, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
2.5
2.0
1.5
1.0
LMX321 toc12
VCC = 5V, RL = 5kΩ
-70
-90
-110
-130
-150
0
100
1k
10k
100k
1
10
100
1k
10k
100
100k
100k
1M
10M
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
PSRR-
VCC = 1.35V, VEE = -1.35V
0.05
0.05
-0.05
-80
-0.10
-100
-0.15
-120
∆VOS (mV)
PSRR+
-60
1k
10k
100k
1M
0
-0.05
-0.10
-0.15
-0.20
-0.20
100
VCC = 2.5V, VEE = -2.5V
0.10
0
∆VOS (mV)
-40
0.15
LMX321 toc14
LMX321 toc13
0.10
-1.7
-1.2
-0.7
-0.2
0.3
-2.8 -2.3 -1.8 -1.3 -0.8 -0.3 0.2 0.7 1.2 1.7 2.2
0.8
FREQUENCY (Hz)
COMMON-MODE VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
INPUT OFFSET VOLTAGE
vs. OUTPUT VOLTAGE
INPUT OFFSET VOLTAGE
vs. OUTPUT VOLTAGE
GAIN AND PHASE vs. FREQUENCY
and RESISTIVE LOAD
25
75
INPUT OFFSET VOLTAGE (mV)
RL = 600Ω
RL = 2kΩ
0
RL = 10kΩ
-50
-75
RL = 600Ω
RL = 2kΩ
0
RL = 10kΩ
-25
-1
0
1
OUTPUT VOLTAGE (V)
2
3
60
20
40
RL = 600Ω
10
20
0
0
-50
-10
VCC = 2.5V, VEE = -2.5V
CL = 0pF, RL TO VEE
AVCL = 60dB, VOUT = 0V RL = 100kΩ
-20
-20
-1.5
-1.0
-0.5
0
0.5
OUTPUT VOLTAGE (V)
1.0
1.5
100
80
RL = 100kΩ
30
25
100
-2
40
50
-75
-100
LMX321 toc18
50
GAIN (dB)
75
VCC = +1.35V, VEE = -1.35V
LMX321 toc17
VCC = 2.5V, VEE = -2.5V
50
100
LMX321 toc16
100
100M
LMX321 toc15
FREQUENCY (Hz)
-20
-3
10k
FREQUENCY (Hz)
VCC = 2.7V TO 5V
-25
1k
FREQUENCY (Hz)
-40
10k
100k
1M
FREQUENCY (Hz)
_______________________________________________________________________________________
10M
PHASE MARGIN (degrees)
10
0
PSRR (dB)
3.0
-50
0.5
1
6
VCC = 2.7V TO 5V, VCM = VCC/2
3.5
CROSSTALK REJECTION (dB)
4.0
LMX321 toc11
VCC = 2.7V TO 5V, VCM = VCC/2
LMX321 toc10
600
550
500
450
400
350
300
250
200
150
100
50
0
CROSSTALK REJECTION
vs. FREQUENCY
INPUT CURRENT NOISE
vs. FREQUENCY
INPUT CURRENT NOISE (pA/√Hz)
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT VOLTAGE NOISE
vs. FREQUENCY
INPUT OFFSET VOLTAGE (µV)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
LMX321 toc19
50
LMX321 toc20
50
100
GAIN AND PHASE vs. FREQUENCY
AND CAPACITIVE LOAD
LMX321 toc21
50
100
RL = 600Ω
20
RL = 600Ω
0
0
VCC = 1.35V, VEE = -1.35V
CL = 0, RL TO VEE
AVCL = 60dB, VOUT = 0V RL = 100kΩ
-10
100k
1M
20
FREQUENCY (Hz)
GAIN AND PHASE vs. FREQUENCY
AND TEMPERATURE
50
100
20
TA = +85°C
TA = +85°C
10
40
TA = -25°C
TA = +125°C
20
0
0
VCC = 2.5V, VEE = -2.5V
RL = 2kΩ TO VEE
AVCL = 60dB, VOUT = 0V
-10
-20
10k
100k
1M
PHASE (degrees)
TA = +25°C
LOAD CAPACITANCE (pF)
GAIN (dB)
60
1500
10M
RL = 10kΩ
VIN = 1V STEP, AVCL = +1V/V
1.08
RISING EDGE
1.06
1.04
1.02
FALLING EDGE
1.00
STABLE
0
-40
1M
1.10
1000
-40
100k
SLEW RATE vs.
SUPPLY VOLTAGE
2000
10M
-20
CL = 0
CAPACITIVE-LOAD STABILITY
2500
500
0
CL = 100pF
VCC = 2.5V, VEE = -2.5V
RL = 100kΩ TO VEE
AVCL = 60dB, VOUT = 0V
10k
3000
-20
20
FREQUENCY (Hz)
UNSTABLE
TA = -40°C
30
CL = 1nF
FREQUENCY (Hz)
3500
TA = +25°C 80
-20
10M
4000
TA = -40°C
40
1M
40
10
-10
-20
SLEW RATE (V/µs)
LMX321 toc22
100k
20
0
-40
10k
10M
0.98
0.96
100
1k
10k
2.0
100k
2.5
3.0
3.5
4.0
4.5
5.0
FREQUENCY (Hz)
LOAD RESISTANCE (Ω)
SUPPLY VOLTAGE (V)
NONINVERTING
LARGE-SIGNAL RESPONSE
NONINVERTING
SMALL-SIGNAL RESPONSE
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
LMX321 toc25
LMX321 toc26
RL = 2kΩ
VCC = 5V
VIN
1V/div
5.5
10
RL = 2kΩ
VCC = 5V
VIN
100mV/div
VCC = 2.7V, AV = +10, VOUT = 1VP-P
1
THD+N (%)
VOUT
1V/div
60
CL = 1nF
CL = 500pF
0
VCC = 2.5V, VEE = -2.5V
RL = 600Ω TO VEE
AVCL = 60dB, VOUT = 0V
-20
-40
10k
10
0
-20
-20
40
CL = 1nF
30
LMX321 toc27
-10
20
80
CL = 500pF
LMX321 toc24
10
60
CL = 500pF
GAIN (dB)
40
CL = 0
PHASE (degrees)
20
40
80
30
GAIN (dB)
60
RL = 100kΩ
PHASE (degrees)
30
GAIN (dB)
40
80
MAXLMX toc23
40
100
CL = 0
CL = 100pF
VOUT
100mV/div
VCC = 5V, AV = +10, VOUT = 2.5VP-P
0.1
0.01
VCC = 2.7V, AV = +1, VOUT = 1VP-P
VCC = 5V, AV = +1, VOUT = 2.5VP-P
0.001
1µs/div
1µs/div
10
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
7
PHASE (degrees)
GAIN AND PHASE vs. FREQUENCY
AND CAPACITIVE LOAD
GAIN AND PHASE vs. FREQUENCY
and RESISTIVE LOAD
LMX321/LMX358/LMX324
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, VEE = 0V, unless otherwise noted.)
VCC = 5V
30
25
VCC = 2.7V
20
15
10
VCC = 5V
30
25
20
VCC = 2.7V
15
10
5
LMX321 toc30
35
1000
LMX321 toc29
35
40
SHORT-CIRCUIT CURRENT (mA)
LMX321 toc28
40
OUTPUT IMPEDANCE
vs. FREQUENCY
SHORT-CIRCUIT CURRENT
vs. TEMPERATURE (SOURCING)
VCC = 2.7V TO 5V
AVCL = +1V/V
OUTPUT IMPEDANCE (Ω)
SHORT-CIRCUIT CURRENT
vs. TEMPERATURE (SINKING)
SHORT-CIRCUIT CURRENT (mA)
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
100
10
1
0.01
5
0
0.001
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Pin Description
PIN
NAME
8
FUNCTION
LMX321
LMX358
LMX324
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
5
8
4
VCC
Positive Supply
—
1
1
OUT1
—
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
Output for Amplifier 1
_______________________________________________________________________________________
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
LMX321/LMX358/LMX324
3.5kΩ
RL
CL
LMX321
LMX358
LMX324
3.5kΩ
Figure 3. Capacitive-Load-Driving Circuit
Figure 1. Input Protection Circuit
VIN
2V/div
VCC = 5V, VEE = 0V, CL = 2.2nF, RL = 2kΩ
2.6V
2.5V
VIN
100mV/div
2.4V
VOUT
1V/div
2.6V
VOUT
100mV/div
2.4V
-2.5V
200µs/div
4µs/div
VCC = 2.5V, VEE = -2.5V, AVCL = 2V/V
Figure 2. Rail-to-Rail Output Swing
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 voltages (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 current 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 exponentially from 3MΩ to 7kΩ as the diode block begins conducting. Inversely, the bias current increases with the
same curve.
Figure 4. Output With Excessive Capacitive Load
Rail-to-Rail Output Stage
The LMX321/LMX358/LMX324 drive 2kΩ loads and still
typically swing within 40mV of the supply rails. Figure 2
shows the output voltage swing of the LMX321 configured 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.
_______________________________________________________________________________________
9
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
RISO
VCC
2V/div
CL
LMX321
LMX358
LMX324
VOUT
1V/div
Figure 5. Capacitive-Load-Driving Circuit With Isolation
Resistor
Applications Information
4µs/div
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.
Selector Guide
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
—
PART
10
Figure 6. Power-Up/Power-Down Waveform
Good layout techniques optimize performance by minimizing 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.
Chip Information
LMX321 TRANSISTOR COUNT: 88
LMX358 TRANSISTOR COUNT: 175
LMX324 TRANSISTOR COUNT: 349
PROCESS: Bipolar
______________________________________________________________________________________
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
SC70, 5L.EPS
PACKAGE OUTLINE, 5L SC70
21-0076
E
1
1
______________________________________________________________________________________
11
LMX321/LMX358/LMX324
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.)
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
12
______________________________________________________________________________________
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
SOT23, 8L .EPS
______________________________________________________________________________________
13
LMX321/LMX358/LMX324
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.)
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.)
4X S
8
8
INCHES
DIM
A
A1
A2
b
E
Ø0.50±0.1
H
c
D
e
E
H
0.6±0.1
L
1
1
α
0.6±0.1
S
BOTTOM VIEW
D
MIN
0.002
0.030
MAX
0.043
0.006
0.037
0.014
0.010
0.007
0.005
0.120
0.116
0.0256 BSC
0.120
0.116
0.198
0.188
0.026
0.016
6°
0°
0.0207 BSC
8LUMAXD.EPS
LMX321/LMX358/LMX324
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
MILLIMETERS
MAX
MIN
0.05
0.75
1.10
0.15
0.95
0.25
0.36
0.13
0.18
2.95
3.05
0.65 BSC
2.95
3.05
4.78
5.03
0.41
0.66
0°
6°
0.5250 BSC
TOP VIEW
A1
A2
A
α
c
e
FRONT VIEW
b
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
14
______________________________________________________________________________________
REV.
J
1
1
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
TSSOP4.40mm.EPS
PACKAGE OUTLINE, TSSOP 4.40mm BODY
21-0066
I
1
1
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.
LMX321/LMX358/LMX324
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.)