OPA121 Datasheet, PDF (1/6 Pages) Burr-Brown (TI) – Low Cost Precision Difet OPERATIONAL AMPLIFIER

®
OPA121
Low Cost Precision Difet ^®
OPERATIONAL AMPLIFIER
FEATURES
q LOW NOISE: 6nV/√Hz typ at 10kHz
q LOW BIAS CURRENT: 5pA max
q LOW OFFSET: 2mV max
q LOW DRIFT: 3µV/°C typ
q HIGH OPEN-LOOP GAIN: 110dB min
q HIGH COMMON-MODE
REJECTION: 86dB min
DESCRIPTION
The OPA121 is a precision monolithic dielectrically-
isolated FET (Difet ^®) operational amplifier. Out-
standing performance characteristics are now
available for low-cost applications.
Noise, bias current, voltage offset, drift, open-loop
gain, common-mode rejection, and power supply
rejection are superior to BIFET^® amplifiers.
Very low bias current is obtained by dielectric
isolation with on-chip guarding.
Laser-trimming of thin-film resistors gives very low
offset and drift. Extremely low noise is achieved with
new circuit design techniques (patented). A new
cascode design allows high precision input specifica-
tions and reduced susceptibility to flicker noise.
Standard 741 pin configuration allows upgrading of
existing designs to higher performance levels.
APPLICATIONS
q OPTOELECTRONICS
q DATA ACQUISITION
q TEST EQUIPMENT
q MEDICAL EQUIPMENT
q RADIATION HARD EQUIPMENT
Case (TO-99) and Substrate
8
–In
2
3
+In
Noise-Free
Cascode*
Trim _10kΩ
2kΩ
2kΩ
1
5
Trim ^10kΩ
2kΩ
2kΩ
*Patented
OPA121 Simplified Circuit
7
+V_CC
6
Output
4
–V_CC
Difet ^®, Burr-Brown Corp.
BIFET^®, National Semiconductor Corp.
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
© 1984 Burr-Brown Corporation
PDS-539F
Printed in U.S.A. September, 1993