BURR-BROWN OPA128 User Manual

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查询OPA128供应商

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Electrometer-Grade

OPERATIONAL AMPLIFIER

FEATURES

● ULTRA-LOW BIAS CURRENT: 75fA max

● LOW OFFSET: 500µV max

● LOW DRIFT: 5µV/°C max

● HIGH OPEN-LOOP GAIN: 110dB min

● HIGH COMMON-MODE REJECTION:

90dB min

● IMPROVED REPLACEMENT FOR AD515

AND AD549

OPA128

APPLICATIONS

● ELECTROMETER

● MASS SPECTROMETER

● CHROMATOGRAPH

● ION GAUGE

● PHOTODETECTOR

● RADIATION-HARD EQUIPMENT

DESCRIPTION

The OPA128 is an ultra-low bias current monolithic
operational amplifier. Using advanced geometry
dielectrically-isolated FET (
lithic amplifier achieves a performance level exceed­ing even the best hybrid electrometer amplifiers.

Laser-trimmed thin-film resistors give outstanding volt­age offset and drift performance.

A noise-free cascode and low-noise processing give
the OPA128 excellent low-level signal handling capa­bilities. Flicker noise is very low.

The OPA128 is an improved pin-for-pin replacement
for the AD515.

®

Difet

Burr-Brown Corp.

®

Difet

) inputs, this mono-

Case (Guard)

8

–In

2

3

+In

Trim

Trim

Ω1k

1

5

Ω1k

Noise-Free

Cascode

28kΩ

2kΩ 2kΩ

OPA128 Sim

28kΩ

lified Circuit

7

+V

CC

6

Output

4

–V

CC

SBOS148

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1986 Burr-Brown Corporation PDS-653E Printed in U.S.A. May, 1995

SPECIFICATIONS

ELECTRICAL

At V

= ±15VDC and TA = +25°C, unless otherwise noted. Pin 8 connected to ground.

CC

OPA128JM OPA128KM OPA128LM OPA128SM

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
INPUT

BIAS CURRENT

Input Bias Current VCM = 0VDC,

OFFSET CURRENT

Input Offset Current VCM = 0VDC,

OFFSET VOLTAGE

Input Offset Voltage VCM = 0VDC ±260 ±1000 ±140 ±500 ±140 ±500 ±140 ±500 µV
Average Drift T
Supply Rejection 80 120 90 120 90 120 90 120 dB

NOISE

Voltage: f
f
f
f
f
f
Current: f
f

IMPEDANCE

Differential 10
Common-Mode 10

VOLTAGE RANGE

Common-Mode Input Range ±10 ±12 ±10 ±12 ±10 ±12 ±10 ±12 V
Common-Mode Rejection V

OPEN-LOOP GAIN, DC

Open-Loop Voltage Gain RL ≥ 2kΩ 94 128 110 128 110 128 110 128 dB

FREQUENCY RESPONSE

Unity Gain, Small Signal
Full Power Response 20Vp-p, R
Slew Rate V
Settling Time, 0.1% Gain = –1, R

0.01% 10V Step 10 10 10 10 µs
Overload Recovery,
50% Overdrive

RATED OUTPUT

Voltage Output RL = 2kΩ±10 ±13 ±10 ±13 ±10 ±13 ±10 ±13 V
Current Output V
Output Resistance DC, Open Loop 100 100 100 100 Ω
Load Capacitance Stability Gain = [phone] 1000 pF
Short Circuit Current 10 34 55 10 34 55 10 34 55 10 34 55 mA

POWER SUPPLY

Rated Voltage ±15 ±15 ±15 ±15 VDC
Voltage Range,
Derated Performance ±5 ±18 ±5 ±18 ±5 ±18 ±5 ±18 VDC
Current, Quiescent I

TEMPERATURE RANGE

Specification Ambient Temp. 0 +70 0 +70 0 +70 –55 +125 °C
Operating Ambient Temp. –55 +125 –55 +125 –55 +125 –55 +125 °C
Storage Ambient Temp. –65 +150 –65 +150 –65 +150 –65 +150 °C

θ

Junction-Ambient 200 200 200 200 °C/W

NOTES: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up. Bias current doubles approximately every 11°C. (2) Sample
tested. (3) Overload recovery is defined as the time required for the output to return from saturation to linear operation following the removal of a 50% input overdrive.
(4) If it is possible for the input voltage to exceed the supply voltage, a series protection resistor should be added to limit input current to 0.5mA. The input devices
can withstand overload currents of 0.3mA indefinitely without damage.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

(1)

R

≥ 10kΩ±150 ±300 ±75 ±150 ±40 ±75 ±75 ±150 fA

(1)

(1)

L

R

≥ 10kΩ 65 30 30 30 fA

L

= T

to T

A

MIN

MAX

±20 ±10 ±5 ±10 µV/°C

±1 ±100 ±1 ±32 ±1 ±32 ±1 ±32 µV/V

= 10Hz 92 92 92 92 nV/√Hz

O

= 100Hz 78 78 78 78 nV/√Hz

O

= 1kHz 27 27 27 27 nV/√Hz

O

= 10kHz 15 15 15 15 nV/√Hz

O

= 10Hz to 10kHz 2.4 2.4 2.4 2.4 µVrms

B

= 0.1Hz to 10Hz 4444µVp-p

B

= 0.1Hz to 10Hz 4.2 3 2.3 3 fA, p-p

B

= 0.1Hz to 20kHz 0.22 0.16 0.12 0.16 fA/√Hz

O

13

|| 1 1013 || 1 1013 || 1 1013 || 1 Ω || pF

15

|| 2 1015 || 2 1015 || 2 1015 || 2 Ω || pF

(4)

= ±10VDC 80 118 90 118 90 118 90 118 dB

IN

(2)

= 2kΩ 47 47 47 47 kHz

L

= ±10V, RL = 2kΩ 0.53131313V/µs

O

(3)

L

Gain = –1 5555µs

= ±10VDC ±5 ±10 ±5 ±10 ±5 ±10 ±5 ±10 mA

O

= 0mADC 0.9 1.5 0.9 1.5 0.9 1.5 0.9 1.5 mA

O

0.5 1 0.5 1 0.5 1 0.5 1 MHz

= 2kΩ 5555µs

®

OPA128

2

ELECTRICAL (FULL TEMPERATURE RANGE SPECIFICATIONS)

At V

= ±15VDC and TA = T

CC

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
TEMPERATURE RANGE

Specification Range Ambient Temp. 0 +70 0 +70 0 +70 –55 +125 °C

INPUT
BIAS CURRENT

(1)

Input Bias Current VCM = 0VDC ±2.5 ±8 ±1.3 ±4 ±0.7 ±2 ±43 ±170 pA

OFFSET CURRENT

Input Offset Current VCM = 0VDC 1.1 0.6 0.6 18 pA

OFFSET VOLTAGE

Input Offset Voltage VCM = 0VDC ±2.2mV ±1mV ±750 ±1.5mV µV
Average Drift ±20 ±10 ±5 ±10 µV/°C
Supply Rejection 74 114 80 114 80 114 80 106 dB

VOLTAGE RANGE

Common-Mode Input Range ±10 ±11 ±10 ±11 ±10 ±11 ±10 ±11 V
Commmon-Mode Rejection V

OPEN-LOOP GAIN, DC

Open-Loop Voltage Gain RL ≥ 2kΩ 90 125 104 125 104 125 90 122 dB

RATED OUTPUT

Voltage Output RL = 2k±10 ±10 ±10 ±10 V
Current Output V
Short Circuit Current V

POWER SUPPLY

Current, Quiescent I = 0mADC 0.9 1.8 0.9 1.8 0.9 1.8 0.9 2 mA

NOTES: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up. (2) If it is possible for the input voltage to exceed the supply
voltage, a series protection resistor should be added to limit input current to 0.5mA. The input devices can withstand overload currents of 0.3mA indefinitely without
damage.

and T

MIN

, unless otherwise noted.

MAX

OPA128JM OPA128KM OPA128LM OPA128SM

(1)

(1)

±2 ±200 ±2 ±100 ±2 ±100 ±5 ±100 µV/V

(2)

= ±10VDC 74 112 80 112 80 112 74 104 dB

IN

= ±10VDC ±5 ±5 ±5 ±5mA

O

= 0VDC 10 22 10 22 10 22 10 18 mA

O

CONNECTION DIAGRAM

Top View

Substrate and Case

Offset

Trim

2

–In

+In

1

3

8

OPA128

4

–V

CC

7

5

+V

CC

6

Offset
Trim

Output

ABSOLUTE MAXIMUM RATINGS

Supply ...........................................................................................±18VDC

Internal Power Dissipation

Differential Input Voltage ..............................................................±36VDC

Input Voltage Range .....................................................................±18VDC

Storage Temperature Range .......................................... –65°C to +150°C

Operating Temperature Range ....................................... –55°C to +125°C

Lead Temperature (soldering, 10s) ............................................... +300°C

Output Short Circuit Duration

Junction Temperature .................................................................... +175°C

NOTES: (1) Packages must be derated based on
200°C/W. (2) Short circuit may be to power supply common only. Rating
applies to +25°C ambient. Observe dissipation limit and T

(1)

.......................................................... 500mW

(2)

................................................ Continuous

θ

= 150°C/W or

CA

.

J

ORDERING INFORMATION

PRODUCT PACKAGE RANGE max (fA)

OPA128JM TO-99 0°C to +70°C ±300
OPA128KM TO-99 0°C to +70°C ±150
OPA128LM TO-99 0°C to +70°C ±75
OPA128SM TO-99 –55°C to +125°C ±150

TEMPERATURE BIAS CURRENT,

PACKAGE INFORMATION

PRODUCT PACKAGE NUMBER

PACKAGE DRAWING

OPA128JM TO-99 001
OPA128KM TO-99 001
OPA128LM TO-99 001
OPA128SM TO-99 001

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.

θ

=

JA

(1)

®

3

OPA128

DICE INFORMATION

OPA128 DIE TOPOGRAPHY

PAD FUNCTION

1 Offset Trim
2 –In
3 +In
4–V
5 Offset Trim
6 Output
7+V
8 Substrate

NC No Connection

Substrate Bias: Isolated, normally con­nected to common.

CC

CC

MECHANICAL INFORMATION

MILS (0.001") MILLIMETERS

Die Size 96 x 71 ±5 2.44 x 1.80 ±0.13
Die Thickness 20 ±3 0.51 ±0.08
Min. Pad Size 4 x 4 0.10 x 0.10

Backing None

TYPICAL PERFORMANCE CURVES

At TA = +25°C, ±15VDC, unless otherwise noted.

140

120

100

80

60

Voltage Gain (dB)

40

20

0

11k10 100 10k 100k 1M 10M

120

110

100

OPEN-LOOP FREQUENCY RESPONSE

Gain

Phase

Margin

∼

90°

∼

Frequency (Hz)

COMMON-MODE REJECTION

vs INPUT COMMON-MODE VOLTAGE

–45

Ø

–90

–135

Phase Shift (Degrees)

–180

140

120

100

80

60

40

Power Supply Rejection (dB)

20

140

120

100

80

POWER SUPPLY REJECTION vs FREQUENCY

+PSRR

–PSRR

0

11k10 100 10k 100k 1M 10M

Frequency (Hz)

COMMON-MODE REJECTION

vs FREQUENCY

90

80

Common-Mode Rejection (dB)

70

–15

–10 –5 0 5 10 15

Common-Mode Voltage (V)

®

OPA128

60

40

20

Common-Mode Rejection (dB)

0

11k10 100 10k 100k 1M 10M

4

Frequency (Hz)