National Semiconductor LM7321 Technical data

September 5, 2008

LM7321 Single/ LM7322 Dual Rail-to-Rail Input/Output
±15V, High Output Current and Unlimited Capacitive Load
Operational Amplifier

LM7321 Single/ LM7322 Dual Rail-to-Rail Input/Output, ±15V, High Output Current and Unlimited

Capacitive Load Operational Amplifier

General Description

The LM7321/LM7322 are rail-to-rail input and output ampli­fiers with wide operating voltages and high output currents.
The LM7321/LM7322 are efficient, achieving 18 V/µs slew
rate and 20 MHz unity gain bandwidth while requiring only 1
mA of supply current per op amp. The LM7321/LM7322 per­formance is fully specified for operation at 2.7V, ±5V and
±15V.

The LM7321/LM7322 are designed to drive unlimited capac­itive loads without oscillations. All LM7321 and LM7322 parts
are tested at −40°C, 125°C, and 25°C, with modern automatic
test equipment. High performance from −40°C to 125°C, de­tailed specifications, and extensive testing makes them suit­able for industrial, automotive, and communications applica­tions.

Greater than rail-to-rail input common mode voltage range
with 50 dB of common mode rejection across this wide voltage
range, allows both high side and low side sensing. Most de­vice parameters are insensitive to power supply voltage, and
this makes the parts easier to use where supply voltage may
vary, such as automotive electrical systems and battery pow­ered equipment. These amplifiers have true rail-to-rail output
and can supply a respectable amount of current (15 mA) with
minimal head- room from either rail (300 mV) at low distortion
(0.05% THD+Noise). There are several package options for
each part. Standard SOIC versions of both parts make up­grading existing designs easy. LM7322 is offered in a space
saving 8-Pin MSOP package. The LM7321 is offered in small
SOT23-5 package, which makes it easy to place this part
close to sensors for better circuit performance.

Features

(VS = ±15, TA = 25°C, Typical values unless specified.)

Wide supply voltage range 2.5V to 32V

■

Output current +65 mA/−100 mA

■

Gain bandwidth product 20 MHz

■

Slew rate 18 V/µs

■

Capacitive load tolerance Unlimited

■

Input common mode voltage 0.3V beyond rails

■

Input voltage noise 15 nV/√Hz

■

Input current noise 1.3 pA/√Hz

■

Supply current/channel 1.1 mA

■

Distortion THD+Noise −86 dB

■

Temperature range −40°C to 125°C

■

Tested at −40°C, 25°C and 125°C at 2.7V, ±5V, ±15V.

■

Applications

Driving MOSFETs and power transistors

■

Capacitive proximity sensors

■

Driving analog optocouplers

■

High side sensing

■

Below ground current sensing

■

Photodiode biasing

■

Driving varactor diodes in PLLs

■

Wide voltage range power supplies

■

Automotive

■

International power supplies

■

Typical Performance Characteristics

Output Swing vs. Sourcing Current

20205736

© 2008 National Semiconductor Corporation 202057 www.national.com

Large Signal Step Response

20205749

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

ESD Tolerance (Note 2)

LM7321/LM7322

Human Body Model 2 kV
Machine Model 200V
Charge-Device Model 1 kV
VIN Differential

Output Short Circuit Current (Note 3)
Supply Voltage (VS = V+ - V−)

Voltage at Input/Output pins V+ +0.8V, V− −0.8V

Storage Temperature Range −65°C to 150°C

±10V

35V

Junction Temperature (Note 4) 150°C
Soldering Information:

Infrared or Convection (20 sec.)
 Wave Soldering (10 sec.)

Operating Ratings

Supply Voltage (VS = V+ - V−)

Temperature Range (Note 4) −40°C to 125°C
Package Thermal Resistance, θJA,(Note 4)

5-Pin SOT-23 325°C/W
8-Pin MSOP 235°C/W
8-Pin SOIC 165°C/W

2.7V Electrical Characteristics (Note 5)

Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, VCM = 0.5V, V
RL > 1 MΩ to 1.35V. Boldface limits apply at the temperature extremes.

Symbol Parameter Condition Min

(Note 7)

V

OS

TC V

I

B

I

OS

CMRR Common Mode Rejection Ratio

PSRR Power Supply Rejection Ratio

CMVR Common Mode Voltage Range CMRR > 50 dB −0.3 −0.1

A

VOL

V

OUT

Input Offset Voltage VCM = 0.5V & VCM = 2.2V −5

−6

Input Offset Voltage Temperature Drift VCM = 0.5V & VCM = 2.2V

OS

Input Bias Current VCM = 0.5V

Input Offset Current VCM = 0.5V and VCM = 2.2V 20 200

Open Loop Voltage Gain

Output Voltage Swing
High

Output Voltage Swing
Low

(Note 8)

(Note 9)

VCM = 2.2V
(Note 9)

0V ≤ VCM ≤ 1.0V

0V ≤ VCM ≤ 2.7V

2.7V ≤ VS ≤ 30V

0.5V ≤ VO ≤ 2.2V

RL = 10 kΩ to 1.35V

0.5V ≤ VO ≤ 2.2V

RL = 2 kΩ to 1.35V

RL = 10 kΩ to 1.35V
VID = 100 mV

RL = 2 kΩ to 1.35V
VID = 100 mV

RL = 10 kΩ to 1.35V
VID = −100 mV

RL = 2 kΩ to 1.35V
VID = −100 mV

−2.0

−2.5

70

60

55

50

78

74

2.8

2.7

65

62

59

55

= 1.35V, and

OUT

Typ

(Note 6)

±0.7 +5

±2 µV/C

−1.2

0.45 1.0

100

70

104

3.0

72

66

50 150

100 250

20 120

40 120

2.5V to 32V

Max

(Note 7)

+6

1.5

300

0.0

160

280

150

150

235°C

260°C

Units

mV

µA

nA

dB

dB

V

dB

mV from

either rail

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LM7321/LM7322

Symbol Parameter Condition Min

(Note 7)

I

OUT

Output Current Sourcing

VID = 200 mV, V

= 0V (Note 3)

OUT

Sinking
VID = −200 mV, V

I

S

Supply Current LM7321 0.95 1.3

= 2.7V (Note 3)

OUT

LM7322 2.0 2.5

30

20

40

30

Typ

(Note 6)

48

65

Max

(Note 7)

1.9

Units

mA

mA

3.8

SR Slew Rate (Note 10) AV = +1, VI = 2V Step 8.5 V/µs

f

u

Unity Gain Frequency

RL = 2 kΩ, CL = 20 pF

7.5 MHz

GBW Gain Bandwidth f = 50 kHz 16 MHz

e

n

i

n

THD+N Total Harmonic Distortion + Noise V+ = 1.9V, V− = −0.8V

Input Referred Voltage Noise Density f = 2 kHz 11.9

Input Referred Current Noise Density f = 2 kHz 0.5

−77 dB

nV/

pA/

f = 1 kHz, RL = 100 kΩ, AV = +2
V

= 210 mV

CT Rej. Crosstalk Rejection

OUT

f = 100 kHz, Driver RL = 10 kΩ

PP

60 dB

±5V Electrical Characteristics (Note 5)

Unless otherwise specified, all limited guaranteed for TA = 25°C, V+ = 5V, V− = −5V, VCM = 0V, V
RL > 1 MΩ to 0V. Boldface limits apply at the temperature extremes.

Symbol Parameter Condition Min

(Note 7)

V

OS

TC V

Input Offset Voltage VCM = −4.5V and VCM = 4.5V −5

Input Offset Voltage Temperature Drift VCM = −4.5V and VCM = 4.5V

OS

(Note 8)

I

B

Input Bias Current VCM = −4.5V

(Note 9)

−2.0

−2.5

VCM = 4.5V
(Note 9)

I

OS

CMRR Common Mode Rejection Ratio

Input Offset Current VCM = −4.5V and VCM = 4.5V 20 200

−5V ≤ VCM ≤ 3V

−5V ≤ VCM ≤ 5V

PSRR Power Supply Rejection Ratio

2.7V ≤ VS ≤ 30V, VCM = −4.5V

CMVR Common Mode Voltage Range CMRR > 50 dB −5.3 −5.1

A

VOL

Open Loop Voltage Gain

−4V ≤ VO ≤ 4V

RL = 10 kΩ to 0V

−4V ≤ VO ≤ 4V

RL = 2 kΩ to 0V

= 0V, and

OUT

Typ

(Note 6)

Max

(Note 7)

Units

±0.7 +5

−6

+6

±2 µV/°C

−1.2

0.45 1.0

1.5

300

80

100

70

65

80

62

78

104

74

−5.0

5.1

5.3

5.0

74

80

70

68

74

65

mV

µA

nA

dB

dB

V

dB

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Symbol Parameter Condition Min

V

OUT

Output Voltage Swing
High

RL = 10 kΩ to 0V
VID = 100 mV

RL = 2 kΩ to 0V

LM7321/LM7322

Output Voltage Swing
Low

VID = 100 mV

RL = 10 kΩ to 0V
VID = −100 mV

RL = 2 kΩ to 0V
VID = −100 mV

I

OUT

Output Current Sourcing

VID = 200 mV, V

= −5V (Note 3)

OUT

Sinking
VID = −200 mV, V

I

S

Supply Current VCM = −4.5V LM7321 1.0 1.3

= 5V (Note 3)

OUT

(Note 7)

100 250

160 350

35 200

80 200

35

20

50

30

Typ

(Note 6)

70

85

Max

(Note 7)

280

450

250

250

2

LM7322 2.3 2.8

3.8

SR Slew Rate (Note 10) AV = +1, VI = 8V Step 12.3

f

u

Unity Gain Frequency

RL = 2 kΩ, CL = 20 pF

9 MHz

GBW Gain Bandwidth f = 50 kHz 16 MHz

e

n

i

n

THD+N Total Harmonic Distortion + Noise

CT Rej. Crosstalk Rejection

Input Referred Voltage Noise Density f = 2 kHz 14.3

Input Referred Current Noise Density f = 2 kHz 1.35

f = 1 kHz, RL = 100 kΩ, AV = +2
V

= 8 V

OUT

PP

f = 100 kHz, Driver RL = 10 kΩ

−79 dB

60 dB

Units

mV from

either rail

mA

mA

V/µs

nV/

pA/

±15V Electrical Characteristics (Note 5)

Unless otherwise specified, all limited guaranteed for TA = 25°C, V+ = 15V, V− = −15V, VCM = 0V, V
RL > 1MΩ to 15V. Boldface limits apply at the temperature extremes.

Symbol Parameter Condition

V

OS

Input Offset Voltage VCM = −14.5V and VCM = 14.5V −6

Min

(Note 7)

−8

TC V

Input Offset Voltage Temperature Drift VCM = −14.5V and VCM = 14.5V

OS

±2 µV/°C

(Note 8)

I

B

Input Bias Current VCM = −14.5V

(Note 9)

VCM = 14.5V

−2

−2.5

0.45 1.0

(Note 9)

I

OS

CMRR Common Mode Rejection Ratio

Input Offset Current VCM = −14.5V and VCM = 14.5V 30 300

−15V ≤ VCM ≤ 12V

80

75

−15V ≤ VCM ≤ 15V

72

70

PSRR Power Supply Rejection Ratio

2.7V ≤ VS ≤ 30V, VCM = −14.5V

78

74

CMVR Common Mode Voltage Range CMRR > 50 dB −15.3 −15.1

15.1

15

= 0V, and

OUT

Typ

(Note 6)

±0.7 +6

−1.1

100

80

100

15.3

Max

(Note 7)

+8

1.5

500

−15

Units

mV

µA

nA

dB

dB

V

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LM7321/LM7322

Symbol Parameter Condition

A

VOL

Open Loop Voltage Gain

−13V ≤ VO ≤ 13V

RL = 10 kΩ to 0V

−13V ≤ VO ≤ 13V

RL = 2 kΩ to 0V

V

OUT

Output Voltage Swing
High

RL = 10 kΩ to 0V
VID = 100 mV

RL = 2 kΩ to 0V
VID = 100 mV

Output Voltage Swing
Low

RL = 10 kΩ to 0V
VID = −100 mV

RL = 2 kΩ to 0V
VID = −100 mV

I

OUT

Output Current Sourcing

VID = 200 mV, V

OUT

Sinking
VID = −200 mV, V

I

S

Supply Current VCM = −14.5V LM7321 1.1 1.7

OUT

Min

(Note 7)

75

70

70

65

150 300

250 550

60 200

130 300

40 65

= −15V (Note 3)

60 100

= 15V (Note 3)

LM7322 2.5 4

Typ

(Note 6)

85

78

Max

(Note 7)

350

650

250

400

2.4

Units

dB

mV from

either rail

mA

mA

5.6

SR Slew Rate

(Note 10)

f

u

Unity Gain Frequency

AV = +1, VI = 20V Step 18

RL = 2 kΩ, CL = 20 pF

11.3 MHz

V/µs

GBW Gain Bandwidth f = 50 kHz 20 MHz

e

n

i

n

THD+N Total Harmonic Distortion +Noise

CT Rej. Crosstalk Rejection

Input Referred Voltage Noise Density f = 2 kHz 15

Input Referred Current Noise Density f = 2 kHz 1.3

f = 1 kHz,RL 100 kΩ,
AV = +2, V

OUT

= 23 V

PP

f = 100 kHz, Driver RL = 10 kΩ

−86 dB

60 dB

nV/

pA/

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Rating indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150°C. Short circuit test is a momentary test. Output short circuit duration is infinite for VS ≤ 6V at room temperature
and below. For VS > 6V, allowable short circuit duration is 1.5 ms.

Note 4: The maximum power dissipation is a function of T
PD = (T

Note 5: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating
of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >
TA.

Note 6: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will
also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 7: All limits are guaranteed by testing or statistical analysis.

Note 8: Offset voltage temperature drift determined by dividing the change in VOS at temperature extremes into the total temperature change.

Note 9: Positive current corresponds to current flowing into the device.

Note 10: Slew rate is the slower of the rising and falling slew rates. Connected as a Voltage Follower.

) - TA)/ θJA. All numbers apply for packages soldered directly onto a PC board.

J(MAX)

, θJA. The maximum allowable power dissipation at any ambient temperature is

J(MAX)

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Connection Diagrams

5-Pin SOT-23

LM7321/LM7322

Top View

Ordering Information

Package Part Number Package

5-Pin SOT-23

8-Pin MSOP

8-Pin SOIC

8-Pin SOIC

20205705

Top View

Marking

LM7321MF

AU4A

LM7321MFX 3k Units Tape and Reel

LM7322MM

AZ4A

LM7322MMX 3.5k Units Tape and Reel

LM7321MA

LM7321MAX 2.5k Units Tape and Reel

LM7322MA LM7322MA 95 Units/Rail

LM7322MAX 2.5k Units Tape and Reel

LM7321MA

20205703

Media Transport NSC Drawing

1k Units Tape and Reel

1k Units Tape and Reel

95 Units/Rail

8-Pin MSOP/SOIC

Top View

20205706

MF05ALM7321MFE 250 Units Tape and Reel

MUA08ALM7322MME 250 Units Tape and Reel

M08A

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LM7321/LM7322

Typical Performance Characteristics Unless otherwise specified: T

Output Swing vs. Sourcing Current

20205734

Output Swing vs. Sourcing Current

Output Swing vs. Sinking Current

Output Swing vs. Sinking Current

= 25°C.

A

20205731

Output Swing vs. Sourcing Current

20205735

20205736

20205732

Output Swing vs. Sinking Current

20205733

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LM7321/LM7322

VOS Distribution

VOS vs. VCM (Unit 1)

VOS vs. VCM (Unit 2)

VOS vs. VCM (Unit 1)

20205730

20205708

20205707

VOS vs. VCM (Unit 3)

20205709

VOS vs. VCM (Unit 2)

20205710

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20205711