OPA124 Datasheet, PDF (1/13 Pages) Burr-Brown (TI) – Low Noise Precision Difet OPERATIONAL AMPLIFIER

®
OPA124
OPA124
Low Noise Precision Difet ^®
OPERATIONAL AMPLIFIER
SBOS028
FEATURES
q LOW NOISE: 6nV/√Hz (10kHz)
q LOW BIAS CURRENT: 1pA max
q LOW OFFSET: 250µV max
q LOW DRIFT: 2µV/°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
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.
APPLICATIONS
q PRECISION PHOTODIODE PREAMP
q MEDICAL EQUIPMENT
q OPTOELECTRONICS
q DATA ACQUISITION
q TEST EQUIPMENT
Substrate
8
–In
2
+In
3
Noise-Free Cascode⁽²⁾
Trim^{(1) 10kΩ}
1
Trim⁽¹⁾ 10kΩ
5
2kΩ
2kΩ
2kΩ
2kΩ
OPA124 Simplified Circuit
NOTES: (1) Omitted on SOIC. (2) Patented.
+V_CC
7
Output
6
–V_CC
4
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© 1993 Burr-Brown Corporation
PDS-11203C
®
OPA124 ^{Printed in U.S.A. March, 1998}