Data Sheet
FEATURES
Low input offset voltage: 150 μV (maximum)
Low offset voltage drift over –55°C to +125°C: 1.2 μV/°C
(maximum)
Low supply current (per amplifier): 725 μA (maximum)
High open-loop gain: 5000 V/mV (minimum)
Input bias current: 3 nA (maximum)
Low noise voltage density: 11 nV/√Hz at 1 kHz
Stable with large capacitive loads: 10 nF typical
Available in die form
Quad Low Offset, Low Power
Operational Amplifier
FUNCTIONAL BLOCK DIAGRAMS
OUTA
1
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
–
+
+
–
–
+
+
–
16
–
+
+
–
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
00304-002
14
OUT D
13
–IN D
12
+IN D
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
00304-001
15
14
OP400
–
+
+
–
13
12
11
10
9
OP400
11
V–
10
+IN C
9
8
–IN C
OUT C
OUT B
7
NC
8
NC
NC = NO CONNECT
Figure 1. 14-Lead Ceramic Dual In-Line
Package [CERDIP] and 14-Lead Plastic
Dual In-Line Package [PDIP]
Figure 2. 16-Lead Standard Small
Outline Package [SOIC_W]
GENERAL DESCRIPTION
The OP400 is the first monolithic quad operational amplifier
that features OP77-type performance. Precision performance is
not sacrificed with the OP400 to obtain the space and cost savings
offered by quad amplifiers.
The OP400 features an extremely low input offset voltage of less
than 150 μV with a drift of less than 1.2 μV/°C, guaranteed over
the full military temperature range. Open-loop gain of the OP400
is more than 5 million into a 10 kΩ load, input bias current is
less than 3 nA, common-mode rejection (CMR) is more than
120 dB, and power supply rejection ratio (PSRR) is less than
1.8 μV/V. On-chip Zener zap trimming achieves the low input
offset voltage of the OP400 and eliminates the need for offset
nulling. The OP400 conforms to the industry-standard quad
pinout, which does not have null terminals.
The OP400 features low power consumption, drawing less than
725 μA per amplifier. The total current drawn by this quad
amplifier is less than that of a single OP07, yet the OP400 offers
significant improvements over this industry-standard op amp.
Voltage noise density of the OP400 is a low 11 nV/√Hz at 10 Hz,
half that of most competitive devices.
The OP400 is an ideal choice for applications requiring multiple
precision operational amplifiers and where low power
consumption is critical.
V+
BIAS
VOLTAGE
LIMITING
NETWORK
+IN
–IN
OUT
V–
00304-003
Figure 3. Simplified Schematic (One of Four Amplifiers Is Shown)
Rev. I
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
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