Low-Noise, Precision
Operational Amplifier
a
OP27
P IN CO NNECTIO NS
FEATURES
Low Noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/
Low Drift: 0.2 ꢀV/ꢁC
High Speed: 2.8 V/ꢀs Slew Rate, 8 MHz Gain
Bandwidth
÷Hz
TO -99
(J-Suffix)
BAL
Low VOS: 10 ꢀV
Excellent CMRR: 126 dB at VCM of ±11 V
High Open-Loop Gain: 1.8 Million
Fits 725, OP07, 5534A Sockets
Available in Die Form
V+
BAL 1
OP27
OUT
–IN 2
NC
+IN 3
GENERAL D ESCRIP TIO N
4V– (CASE)
NC = NO CONNECT
T he OP27 precision operational amplifier combines the low
offset and drift of the OP07 with both high speed and low noise.
Offsets down to 25 mV and drift of 0.6 mV/∞C maximum make
the OP27 ideal for precision instrumentation applications.
Exceptionally low noise, en = 3.5 nV/÷Hz, at 10 Hz, a low 1/f
noise corner frequency of 2.7 Hz, and high gain (1.8 million),
allow accurate high-gain amplification of low-level signals. A
gain-bandwidth product of 8 MHz and a 2.8 V/msec slew rate
provides excellent dynamic accuracy in high-speed, data-
acquisition systems.
8-P in H er m etic D IP
(Z-Suffix)
Epoxy Mini-D IP
(P -Suffix)
8-P in SO
(S-Suffix)
A low input bias current of ± 10 nA is achieved by use of a
bias-current-cancellation circuit. Over the military temperature
range, this circuit typically holds IB and IOS to ±20 nA and 15 nA,
respectively.
1
2
3
4
8
7
6
5
V
TRIM
V
TRIM
–IN
+IN
V–
OS
OS
OP27
V+
OUT
NC
T he output stage has good load driving capability. A guaranteed
swing of ±10 V into 600 W and low output distortion make the
NC = NO CONNECT
OP27 an excellent choice for professional audio applications.
(Continued on page 7)
V+
C2
R3
R4
1
8
Q6
Q22
Q46
C1
V
ADJ.
OS
R23 R24
Q24
R1*
R2*
Q21
Q23
R9
Q20 Q19
OUTPUT
R12
Q1A Q1B
Q2B Q2A
NONINVERTING
INPUT (+)
C3
C4
R5
Q3
Q26
INVERTING
INPUT (–)
Q45
Q11 Q12
Q27
Q28
*R1 AND R2 ARE PERMANENTLY
ADJUSTED ATWAFERTEST FOR
MINIMUM OFFSETVOLTAGE.
V–
Figure 1. Simplified Schematic
REV. B
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