FEATURES
Low Input Offset Voltage: 75 V Max
Low Offset Voltage Drift, Over –55C
0.5 V/C Max
Low Supply Current (Per Amplifier): 725 mA Max
High Open-Loop Gain: 5000 V/mV Min
Low Input Bias Current: 2 nA Max
Low Noise Voltage Density: 11 nV/÷Hzat 1 kHz
Stable with Large Capacitive Loads: 10 nF Typ
Pin Compatible to OP221, MC1458, and LT1013 with
Improved Performance
Available in Die Form
GENERAL DESCRIPTION
The OP200 is the first monolithic dual operational amplifier to
offer OP77 type precision performance. Available in the industry
standard 8-pin pinout, the OP200 combines precision performance
with the space and cost savings offered by a dual amplifier.
The OP200 features an extremely low input offset voltage of less
than 75 mV with a drift below 0.5 mV/∞C, guaranteed over the full
military temperature range. Open-loop gain of the OP200 exceeds
5,000,000 into a 10 kW load; input bias current is under 2 nA;
CMR is over 120 dB and PSRR below 1.8 mV/V. On-chip zener-
zap trimming is used to achieve the extremely low input offset
voltage of the OP200 and eliminates the need for offset pulling.
Power consumption of the OP200 is very low, with each amplifier
drawing less than 725 mA of supply current. The total current
drawn by the dual OP200 is less than one-half that of a single
OP07, yet the OP200 offers significant improvements over this
industry standard op amp. The voltage noise density of the OP200,
11 nV/÷Hzat 1 kHz, is half that of most competitive devices.
The OP200 is pin compatible with the OP221, LM158,
MC1458/1558, and LT1013.
<
T
<
+125C:
A
Operational Amplifier
OP200
PIN CONNECTIONS
16-Pin SOIC
(S-Suffix)
EPOXY MINI-DI
(P-Suffix),
8-Pin Hermetic DIP
(Z-Suffix)
The OP200 is an ideal choice for applications requiring multiple
precision op amps and where low power consumption is critical.
For a quad precision op amp, see the OP400.
P
VOLTAGE
LIMITING
NETWORK
+IN–IN
Figure 1. Simplified Schematic (One of two amplifiers is shown.)
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the OP200 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
REV. A
–5–
Page 6
OP200
–Typical Performance Characteristics
TA = 25C
= 15V
V
S
2
1
CHANGE IN OFFSET VOLTAGE – V
5
0
12345
TIME – Minutes
TPC 1. Warm-Up Drift
300
VS = 15V
250
200
150
100
50
INPUT OFFSET CURRENT – pA
0
–75
–50 –25 025 50 75 100 125
TEMPERATURE – C
TPC 4. Input Offset Current vs.
Temperature
60
VS = 15V
50
40
30
20
10
INPUT OFFSET VOLTAGE – V
0
–75
–50 –25 025 50 75 100 125
TEMPERATURE – C
TPC 2. Input Offset Voltage
vs. Temperature
1.0
TA = 25C
VS = 15V
0.8
0.6
0.4
0.2
INPUT BIAS CURRENT – nA
0
–15
–10–5051015
COMON-MODE VOLTAGE – V
TPC 5. Input Bias Current vs.
Common-Mode Voltage
3
VS = 15V
2
1
0
–1
INPUT BIAS CURRENT – nA
–2
–3
–50 –25 025 50 75 100 125
–75
TEMPERATURE – C
TPC 3. Input Bias Current vs.
Temperature
140
120
100
80
60
40
20
COMMON-MODE REJECTION – dB
0
1
101001k10k100k
FREQUENCY – Hz
TA = 25C
= 15V
V
S
TPC 6. Common-Mode Rejection
vs. Frequency
CURRENT NOISE DENSITY – nV/ Hz
100
10
110010
FREQUENCY – Hz
TA = 25C
= 15V
V
S
TPC 7. Voltage Noise Density
vs. Frequency
1000
CURRENT NOISE DENSITY – fA/ Hz
1k
100
1
101k100
FREQUENCY – Hz
TPC 8. Current Noise Density
TA = 25C
= 15V
V
S
TPC 9. 0.1 to 10Hz Noise
vs. Frequency
–6–
REV. A
Page 7
OP200
1.18
TWO AMPLIFIERS
= 25C
T
A
1.16
1.14
1.12
1.10
1.08
TOTAL SUPPLY CURRENT – mA
1.06
26101416
SUPPLY VOLTAGE – V
TPC 10. Total Supply Current
vs. Supply Voltage
0.7
0.6
0.5
0.4
0.3
0.2
POWER SUPPLY REJECTION – V/V
0.1
–75
–50 –25 025 50 75 100 125
TEMPERATURE – C
TPC 13. Power Supply Rejection
vs. Temperature
1.16
TWO AMPLIFIERS
VS = 15V
1.15
1.14
1.13
SUPPLY CURRENT – mA
1.12
1.11
–75
–50 –25 025 50 75 100 125
TEMPERATURE – C
TPC 11. Total Supply Current
vs. Temperature
6000
5000
4000
3000
2000
OPEN-LOOP GAIN – V/mV
1000
0
–75
–50 –25 025 50 75 100 125
TEMPERATURE – C
VS = 15V
RL = 2k
TPC 14. Open Loop Gain vs.
Temperature
140
120
100
80
60
40
20
TA = 25C
POWER SUPPLY REJECTION – nA
0
1101001k10k 100k
0.1
POSITIVE
SUPPLY
FREQUENCY – Hz
NEGATIVE
SUPPLY
TPC 12. Power Supply Rejection
vs. Temperature
140
120
100
80
60
40
OPEN-LOOP GAIN – dB
20
0
–20
101001k10k100k
FREQUENCY – Hz
GAIN
TA = 25C
= 15V
V
S
PHASE
TPC 15. Open Loop Gain and
Phase Shift vs. Frequency
0
90
135
PHASE SHIFT – Degrees
180
1M
140
120
100
AV = 1000
80
AV = 100
60
GAIN – dB
AV = 10
40
AV = 1
20
0
101001k10k100k
FREQUENCY – Hz
TPC 16. Closed Loop Gain
vs. Frequency
REV. A
TA = 25C
= 15V
V
S
1M
30
25
20
15
10
5
OUTPUT SWING – V p-p AT 1% Distortion
0
101001k10k
FREQUENCY – Hz
TA = 25C
VS = 15V
TPC 17. Maximum Output Swing
vs. Frequency
–7–
100k
1
0.1
DISTORTION – %
0.01
0.001
FREQUENCY – Hz
AV = 100
AV = 10
AV = 1
TA = 25C
= 15V
V
S
V
= 10V p-p
OUT
R
= 2k
L
TPC 18. Total Harmonic Distortion
vs. Frequency
10k1k100
Page 8
OP200
50
TA = 25C
45
V
40
35
30
25
20
OVERSHOOT – %
15
10
5
0
0
= 15V
S
FALLING
RISING
0.51.01.5
CAPACITIVE LOAD – nF
1.01.53.0
TPC 19. Overshoot vs.
Capacitive Load
29
28
27
26
25
24
SOURCING
23
SHORT-CIRCUIT CURRENT – mA
22
01345
SINKING
2
TIME – Minutes
TPC 20. Short-Circuit
Current vs. Time
TA = 25C
VS = 15V
150
140
130
120
110
CHANNEL SEPARATION – dB
100
90
101001k10k
FREQUENCY – Hz
TPC 21. Channel Separation
vs. Frequency
100k
TPC 22. Large-Signal
Transient Response
TPC 23. Small-Signal
Transient Response
APPLICATIONS INFORMATION
The OP200 is inherently stable at all gains and is capable of
driving large capacitive loads without oscillating. Nonetheless,
good supply decoupling is highly recommended. Proper supply
decoupling reduces problems caused by supply line noise and
improves the capacitive load driving capability of the OP200.
A dual instrumentation amplifier that consumes less than 33 mW
of power per channel is shown in Figure 4. The linearity of the
instrumentation amplifier exceeds 16 bits in gains of 5 to 200
and is better than 14 bits in gains from 200 to 1000. CMRR is
above 115 dB (Gain = 1000). Offset voltage drift is typically
0.2 mV/∞C over the military temperature range which is comparable to the best monolithic instrumentation amplifiers. The
bandwidth of the low-power instrumentation amplifier is a function of gain and is shown below:
The output signal is specified with respect to the reference
input, which is normally connected to analog ground. The
reference input can be used to offset the output from –10 V
to +10 V if required.
–8–
REV. A
Page 9
OP200
PRECISION ABSOLUTE VALUE AMPLIFIER
The circuit of Figure 5 is a precision absolute value amplifier
with an input impedance of 10 MW. The high gain and low
of the OP200 ensure accurate operation with microvolt
TCV
OS
input signals. In this circuit, the input always appears as a
common-mode signal to the op amps. The CMR of the OP200
exceeds 120 dB, yielding an error of less than 2 ppm.
+15
C2
0.1pF
R1
1k
C1
OP200AZ
2
1/2
–15
8
4
30pF
C2
0.1pF
3
V
IN
D1
1N4148
1
D1
1N4148
6
5
R2
2k
R3
1k
1/2
OP200AZ
7
0V < V
OUT
V
OUT
< 10V
Figure 5. Precision Absolute Value Amplifier
PRECISION CURRENT PUMP
Maximum output current of the precision current pump shown
in Figure 6 is ±10 mA. Voltage compliance is ±10 V with ± 15 V
supplies. Output impedance of the current transmitter exceeds
3 MW with linearity better than 16 bits.
=
2
3
100
10k
1/2
OP200EZ
R4
1k
V
IN
= 10mA/V
R3
R5
100
1
7
OP200EZ
+15
8
1/2
4
–15
5
6
I
OUT
R1
10k
V
R2
IN
10k
V
IN
I
=
OUT
RS
Figure 6. Precision Current Pump
DUAL 12-BIT VOLTAGE OUTPUT DAC
The dual output DAC shown in Figure 7 is capable of providing
untrimmed 12-bit accurate operation over the entire military
temperature range. Offset voltage, bias current and gain errors
of the OP-200 contribute less than 1/lO of an LSB error at 12
bits over the military temperature range.
10V
REFERENCE
VOLTAGE
PINS 6(MSB) – 17(LSB)
CONTROL
4
DAC DATA BUS
22
18
19
DAC
20
5V
21
V
DD
R
A
FB
I
OUT
RFBB
I
OUT
AGND
3
A
2
23
B
24
1
2
–
1/2
OP200AZ
3
+
6
–
1/2
OP200AZ
5
+
DAC-8222EW
DAC A
A
V
REF
DAC8212AV
REF
CS
WR
B
DAC8212AV
DAC B
V
DAC A/DAC B
1/2
1/2
DGND
5
Figure 7. Dual 12-Bit Voltage Output DAC
8
1
4
7
OUTA
–15V
OUTB
REV. A
–9–
Page 10
OP200
DUAL PRECISION VOLTAGE REFERENCE
A dual OP200 and a REF-43, a 2.5 V reference, can be used to
build a ±2.5 V precision voltage reference. Maximum output
current from each reference is ±10 mA with load regulation
under 25 mV/mA. Line regulation is better than 15 mV/V and
output voltage drift is under 20 mV/∞C. Output voltage noise
from 0.1 Hz to 10 Hz is typically 75 mV p-p. R1 and D1 ensure
correct start-up.
PROGRAMMABLE HIGH RESOLUTION WINDOW
COMPARATOR
The programmable window comparator shown in Figure 9 is
easily capable of 12-bit accuracy over the full military temperature range. A dual CMOS 12-bit DAC, the DAC-8212, is used
in the voltage switching mode to set the upper and lower thresholds (DAC A and DAC B, respectively).
V
IN
21
V
DD
10V
REFERENCE
PINS 6(MSB) – 17(LSB)
CONTROL
SIGNALS
2
DAC DATA BUS
24
18
DAC
19
20
I
OUT
I
OUT
DAC A/DAC B
CS
WR
A
B
DAC A
1/2
DAC8212AV
DAC B
1/2
DAC8212AV
DGND
5
AGND
R
A
4
REF
R
B
22
REF
1
R1
10k
–15V
R2
10k
3
2
4
5
+5V
R2
1/2
OP200AZ
10k
8
1/2
OP-200AZ
4
–5V
7
2
3
R1
22k
2
REF-43A
4
6
D1
1N914
6
5
Figure 8. Dual Precision Voltage Reference
15V
8
+
1/2
OP200AZ
–
+
1/2
OP200AZ
1
D1
R3
1N4148
10k
D2
1N4148
7
R4
10k
OUTB
5V
Q1
2N2222
–
R4
5k
TTL OUT
R3
10k
–2.5V
–2.5V
Figure 9. Programmable High Resolution Window Comparator