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www.fairchildsemi.com
Features
High DC precision
Very low VOS – 30
m
V
Very low VOS drift – 0.3
m
V/C
High open-loop gain – 5000 V/mV
High CMRR – 120 dB
Description
The RC4277 provides the highest precision available in a
dual bipolar operational amplifier. A monolithic dual version
of the RC4077, the RC4277 is designed to replace OP-07
and OP-77 type amplifiers in applications requiring high PC
board layout density. The RC4277 has a well-balanced,
mutually supporting set of input specifications. Low V
OS
,
low I
B
, high open-loop gain, and excellent matching charac-
teristics combine to raise the performance level of many
instrumentation, low-level signal conditioning, and data
conversion applications. PSRR, CMRR, V
OS
drift, and noise
levels also support high precision operation.
The high performance of the RC4277 results from two inno-
vative and unconventional manufacturing steps, plus careful
circuit layout and design. The key steps are SiCr thin-film
resistor deposition and post-package trimming of the input
offset voltage characteristic. The low 75
m
V max V
OS
specification is maintained in high-volume production by
way of the post-package trim procedure, where internal
resistors are trimmed through the device input leads at the
final test operation. Devices retain this low offset through the
stability and accuracy of the trimmed thin-film resistors.
The RC4277 is available in 8-lead plastic and ceramic DIPs.
High PSRR – 120 db
Low noise – 0.35
m
V
p-p
(0.1 Hz to 10 Hz)
Low input bias current – 3.0 nA
Low power consumption – 140 mW
Block Diagram
A
B
65-3468-01
Output A
–Input A
+Input A
–VS
+VS
Output B
–Input B
+Input B
RC4277
Dual Prec ision Operational Amplifier
Rev. 1.0.0