®
OPA111
Low Noise Precision
Difet
®
OPERATIONAL AMPLIFIER
FEATURES
q
LOW NOISE: 100% Tested, 8nV
√
Hz max
(10kHz)
q
q
q
q
q
LOW BIAS CURRENT: 1pA max
LOW OFFSET: 250
µ
V max
LOW DRIFT: 1
µ
V/
°
C max
HIGH OPEN-LOOP GAIN: 120dB min
HIGH COMMON-MODE REJECTION:
100dB min
APPLICATIONS
q
PRECISION INSTRUMENTATION
q
DATA ACQUISITION
q
TEST EQUIPMENT
q
OPTOELECTRONICS
q
MEDICAL EQUIPMENT—CAT SCANNER
q
RADIATION HARD EQUIPMENT
DESCRIPTION
The OPA111 is a precision monolithic dielectrically
isolated FET (
Difet
®
) operational amplifier. Outstand-
ing performance characteristics allow its use in the
most critical instrumentation applications.
Noise, bias current, voltage offset, drift, open-loop
gain, common-mode rejection, and power supply re-
jection are superior to BIFET
®
amplifiers.
Very low bias current is obtained by dielectric isola-
tion with on-chip guarding.
Laser trimming of thin-film resistors gives very low
offset and drift. Extremely low noise is achieved with
patented circuit design techniques. A new cascode
design allows high precision input specifications and
reduced susceptibility to flicker noise.
Standard 741 pin configuration allows upgrading of
existing designs to higher performance levels.
Case and
Substrate
8
–In
2
+In
3
Noise-Free Cascode
*
Output
6
Trim
1
Trim
5
10kΩ
2kΩ
2kΩ
+V
CC
7
10kΩ
2kΩ
2kΩ
–V
CC
4
*Patented
BIFET
®
National Semiconductor Corp.,
Difet
®
Burr-Brown Corp.
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1984 Burr-Brown Corporation
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
PDS-526K
Printed in U.S.A. August, 1995
BURR-BROWN [ BURR-BROWN CORPORATION ]
