®
OPA
124
OPA124
Low Noise Precision
Difet
®
OPERATIONAL AMPLIFIER
FEATURES
q
LOW NOISE: 6nV/
√
Hz (10kHz)
q
LOW BIAS CURRENT: 1pA max
q
LOW OFFSET: 250
µ
V max
q
LOW DRIFT: 2
µ
V/
°
C max
q
HIGH OPEN-LOOP GAIN: 120dB min
q
HIGH COMMON-MODE REJECTION:
100dB min
q
AVAILABLE IN 8-PIN PLASTIC DIP
AND 8-PIN SOIC PACKAGES
Substrate
APPLICA
TIONS
q
PRECISION PHOTODIODE PREAMP
q
MEDICAL EQUIPMENT
q
OPTOELECTRONICS
q
DATA ACQUISITION
q
TEST EQUIPMENT
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.
BIFET
®
National Semiconductor Corp.,
Difet
®
Burr-Brown Corp.
+V
CC
7
8
–In
2
+In
3
Noise-Free Cascode
(2)
Output
6
Trim
(1)
1
Trim
(1)
5
2kΩ
2kΩ
–V
CC
4
10kΩ
2kΩ
2kΩ
10kΩ
OPA124 Simplified Circuit
NOTES: (1) Omitted on SOIC. (2) Patented.
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
®
© 1993 Burr-Brown Corporation
PDS-1203C
1
Printed in U.S.A. March, 1998
OPA124
BURR-BROWN [ BURR-BROWN CORPORATION ]
