Data Sheet
Low Noise, Precision
Operational Amplifier
OP27
FEATURES
PIN CONFIGURATIONS
Low noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz
Low drift: 0.2 µV/°C
High speed: 2.8 V/µs slew rate, 8 MHz gain bandwidth
Low VOS: 10 µV
CMRR: 126 dB at VCM of ±11 V
High open-loop gain: 1.8 million
Available in die form
BAL
BAL 1
OP27
V+
OUT
–IN 2
00317-001
NC
+IN 3
4V– (CASE)
NC = NO CONNECT
GENERAL DESCRIPTION
Figure 1. 8-Lead TO-99 (J-Suffix)
VOS TRIM 1
OP27
8
VOS TRIM
–IN 2
7 V+
+IN 3
6 OUT
V– 4
5 NC
00317-002
The OP27 precision operational amplifier combines the low
offset and drift of the OP07 with both high speed and low noise.
Offsets down to 25 µV and maximum drift of 0.6 µV/°C make
the OP27 ideal for precision instrumentation applications. 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/µs slew rate provide excellent
dynamic accuracy in high speed, data-acquisition systems.
NC = NO CONNECT
Figure 2. 8-Lead CERDIP – Glass Hermetic Seal (Z-Suffix),
8-Lead PDIP (P-Suffix), and 8-Lead SOIC (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.
The output stage has good load driving capability. A guaranteed
swing of ±10 V into 600 Ω and low output distortion make the
OP27 an excellent choice for professional audio applications.
(Continued on Page 3)
FUNCTIONAL BLOCK DIAGRAM
V+
R3
Q6
R11
1
8
.
VOS ADJ.
C2
R4
Q22
R21
R23
Q21
Q24
Q23
Q46
C1
R24
R9
Q20
Q1A
Q1B
Q2B
Q19
OUTPUT
R12
Q2A
NONINVERTING
INPUT (+)
C3
R5
C4
Q3
INVERTING
INPUT (–)
Q11
Q26
Q12
Q27
Q45
Q28
ADJUSTED AT WAFER TEST FOR
MINIMUM OFFSET VOLTAGE
V–
00317-003
1 R1 AND R2 ARE PERMANENTLY
Figure 3.
Rev. H
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