OP200 Analog Devices, OP200 Datasheet - Page 12

• Manufacturer Part Number: OP200
• Description: Dual Low Offset, Low Power Operational Amplifier
• Manufacturer: Analog Devices

Specifications of OP200

• -3db Bandwidth: 500kHz
• Slew Rate: 150mV/µs
• Vos: 80µV
• Ib: 100pA
• # Opamps Per Pkg: 2
• Input Noise (nv/rthz): 11nV/rtHz
• Vcc-vee: 6V to 40V
• Isy Per Amplifier: 775µA
• Packages: DIP,LCC,SOIC

OP200
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.
DUAL LOW POWER INSTRUMENTATION
AMPLIFIER
A dual instrumentation amplifier that consumes less than 33 mW
of power per channel is shown in Figure 30. 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 μV/°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 in Table 7.
Table 7. Gain Bandwidth
Gain
5
10
100
1000
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.
V
REF
V
+
–
IN
20kΩ
Figure 30. Dual Low Power Instrumentation Amplifier
5
6
OP200AZ
1/2
5kΩ
Bandwidth
150 kHz
67 kHz
7.5 kHz
500 Hz
7
V
R
OUT
G
5kΩ
= 5 +
40,000
3
2
R
OP200AZ
G
+15V
–15V
1/2
20kΩ
V
8
4
IN
+ V
1
REF
V
OUT
Rev. D | Page 12 of 16
PRECISION ABSOLUTE VALUE AMPLIFIER
The circuit in Figure 31 is a precision absolute value amplifier
with an input impedance of 10 MΩ. The high gain and low TCV
of the OP200 ensure accurate operation with microvolt input
signals. In this circuit, the input always appears as a common-
mode signal to the op amps. The CMRR of the OP200 exceeds
120 dB, yielding an error of less than 2 ppm.
PRECISION CURRENT PUMP
The maximum output current of the precision current pump
shown in Figure 32 is ±10 mA. Voltage compliance is ±10 V
with ±15 V supplies. Output impedance of the current transmit-
ter exceeds 3 MΩ with linearity better than 16 bits.
V
IN
I
OUT
V
=
+
–
IN
2
3
V
RS
IN
OP200AZ
=
10kΩ
10kΩ
+15V
–15V
1/2
R1
R1
Figure 31. Precision Absolute Value Amplifier
100Ω
V
8
4
IN
0.1pF
0.1pF
C2
C2
Figure 32. Precision Current Pump
= 10mA/V
30pF
1
2
C1
3
1kΩ
OP200EZ
R4
10kΩ
1/2
R3
1N4148
D1
1N4148
D1
1kΩ
R1
1
7
OP200EZ
+15V
–15V
R2
2kΩ
8
4
1/2
6
5
100Ω
R5
OP200AZ
1kΩ
1/2
R3
5
6
7
0V < V
OUT
I
OUT
< 10V
V
OUT
OS