opa124.pdf

OPA124

Low Noise Precision Difet ®

OPERATIONAL AMPLIFIER

FEATURES

LOW NOISE: 6nV/

Hz (10kHz)

APPLICATIONS

PRECISION PHOTODIODE PREAMP

LOW BIAS CURRENT: 1pA max

MEDICAL EQUIPMENT

LOW OFFSET: 250

V max

OPTOELECTRONICS

LOW DRIFT: 2

C max

DATA ACQUISITION

HIGH OPEN-LOOP GAIN: 120dB min

TEST EQUIPMENT

HIGH COMMON-MODE REJECTION:

100dB min

AVAILABLE IN 8-PIN PLASTIC DIP

AND 8-PIN SOIC PACKAGES

DESCRIPTION

The OPA124 is a precision monolithic FET opera-

tional amplifier using a Difet (dielectrical isolation)

manufacturing process. Outstanding DC and AC per-

formance characteristics allow its use in the most

critical instrumentation applications.

Bias current, noise, voltage offset, drift, open-loop

gain, common-mode rejection and power supply re-

jection are superior to BIFET and CMOS amplifiers.

Difet fabrication achieves extremely low input bias

currents without compromising input voltage noise

performance. Low input bias current is maintained

over a wide input common-mode voltage range with

unique cascode circuitry. This cascode design also

allows high precision input specifications and reduced

susceptibility to flicker noise. Laser trimming of thin-

film resistors gives very low offset and drift.

Compared to the popular OPA111, the OPA124 gives

comparable performance and is available in an 8-pin

PDIP and 8-pin SOIC package.

Substrate

+V CC

–In

+In

Noise-Free Cascode (2)

Output

Trim (1)

10k

Trim (1)

10k

–V CC

OPA124 Simplified Circuit

NOTES: (1) Omitted on SOIC. (2) Patented.

BIFET ® National Semiconductor Corp.,

Difet ® Burr-Brown Corp.

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

PDS-1203C

Printed in U.S.A. March, 1998

OPA124

SPECIFICATIONS

ELECTRICAL

At V CC =

15VDC and T A = +25

C, unless otherwise noted.

OPA124U, P

OPA124UA, PA

OPA124PB

PARAMETER

CONDITION

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

INPUT NOISE

Voltage, f O = 10Hz (4)

[

nV/

f O = 100Hz (4)

[

nV/

f O = 1kHz (4)

[

nV/

f O = 10kHz (5)

[

nV/

f B = 10Hz to 10kHz (5)

0.7

1.2

[

Vrms

f B = 0.1Hz to 10Hz

1.6

3.3

[

Vp-p

Current, f B = 0.1Hz to 10Hz

9.5

[

fAp-p

f O = 0.1Hz thru 20kHz

0.5

0.8

[

fA/

OFFSET VOLTAGE (1)

Input Offset Voltage

V CM = 0VDC

200

800

150

500

100

250

vs Temperature

T A = T MIN to T MAX

7.5

Supply Rejection

V CC =

10V to

18V

110

[

100

[

vs Temperature

T A = T MIN to T MAX

100

[

BIAS CURRENT (1)

Input Bias Current

V CM = 0VDC

0.5

0.35

OFFSET CURRENT (1)

Input Offset Current

V CM = 0VDC

0.5

0.25

0.5

IMPEDANCE

Differential

10 13 || 1

[

|| pF

Common-Mode

10 14 || 3

[

|| pF

VOLTAGE RANGE

Common-Mode Input Range

[

Common-Mode Rejection

V IN =

10VDC

110

[

100

[

vs Temperature

T A = T MIN to T MAX

100

[

OPEN-LOOP GAIN, DC

Open-Loop Voltage Gain

R L

106

125

[

120

[

FREQUENCY RESPONSE

Unity Gain, Small Signal

1.5

[

MHz

Full Power Response

20Vp-p, R L = 2k

[

kHz

Slew Rate

V O =

10V, R L = 2k

1.6

[

THD

0.0003

[

Settling Time, 0.1%

Gain = –1, R L = 2k

[

0.01%

10V Step

[

Overload Recovery,

50% Overdrive (2)

Gain = –1

[

RATED OUTPUT

Voltage Output

R L = 2k

[

Current Output

V O =

10VDC

5.5

[

Output Resistance

DC, Open Loop

100

[

Load Capacitance Stability

Gain = +1

1000

[

Short Circuit Current

[

POWER SUPPLY

Rated Voltage

[

VDC

Voltage Range, Derated

[

VDC

Current, Quiescent

I O = 0mADC

2.5

3.5

[

TEMPERATURE RANGE

Specification

T MIN and T MAX

–25

+85

[

Storage

–65

+125

[

Junction-Ambient: PDIP

[

C/W

SOIC

100

[

C/W

Specification same as OPA124U, P

NOTES: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up. For performance at other temperatures see Typical Performance

Curves. (2) 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.

(3) For performance at other temperatures see Typical Performance Curves. (4) Sample tested, 98% confidence. (5) Guaranteed by design.

OPA124

[

CONNECTION DIAGRAMS

Top View

DIP

Top View

SOIC

Offset Trim

Substrate

–In

+V S

Output

–In

+V S

+In

Output

–V S

Offset Trim

–V S

NC = No Connect

PACKAGE/ORDERING INFORMATION

BIAS

OFFSET

PACKAGE

TEMPERATURE

CURRENT

DRIFT

PRODUCT

PACKAGE

DRAWING NUMBER (1)

RANGE

pA, max

C, max

OPA124U

8-Lead SOIC

182

–25

C to +85

7.5

OPA124P

8-Pin Plastic DIP

006

–25

C to +85

7.5

OPA124UA

8-Lead SOIC

182

–25

C to +85

OPA124PA

8-Pin Plastic DIP

006

–25

C to +85

OPA124PB

8-Pin Plastic DIP

006

–25

C to +85

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

ABSOLUTE MAXIMUM RATINGS (1)

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown

recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling

and installation procedures can cause damage.

ESD damage can range from subtle performance degrada-

tion to complete device failure. Precision integrated circuits

may be more susceptible to damage because very small

parametric changes could cause the device not to meet its

published specifications.

Supply ...........................................................................................

18VDC

Internal Power Dissipation (2)

......................................................... 750mW

Differential Input Voltage (3)

..........................................................

36VDC

Input Voltage Range (3)

.................................................................

18VDC

Storage Temperature Range .......................................... –65

C to +150

Operating Temperature Range ....................................... –40

C to +125

Output Short Circuit Duration (4) ............................................... Continuous

Junction Temperature .................................................................... +175

NOTES: (1) Stresses above these ratings may cause permanent damage.

(2) Packages must be derated based on

JA = 90

C/W for PDIP and 100

C/W

18VDC, the absolute maximum

input voltage is equal to +18V > V IN > –V CC – 6V. See Figure 2. (4) Short circuit

may be to power supply common only. Rating applies to +25

C ambient.

Observe dissipation limit and T J .

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.