AMP01_17 Datasheet, PDF (1/30 Pages) Analog Devices – Low Noise, Precision Instrumentation Amplifier

Data Sheet
Low Noise, Precision
Instrumentation Amplifier
AMP01
FEATURES
Low offset voltage: 50 μV maximum
Very low offset voltage drift: 0.3 μV/°C maximum
Low noise: 0.12 μV p-p (0.1 Hz to 10 Hz)
Excellent output drive: ±10 V at ±50 mA
Capacitive load stability: up to 1 μF
Gain range: 0.1 to 10,000
Excellent linearity: 16-bit at G = 1000
High CMR: 125 dB minimum (G = 1000)
Low bias current: 4 nA maximum
Can be configured as a precision op amp
Output-stage thermal shutdown
Available in die form
GENERAL DESCRIPTION
The AMP01¹ is a monolithic instrumentation amplifier
designed for high-precision data acquisition and instrumen-
tation applications. The design combines the conventional
features of an instrumentation amplifier with a high current
output stage. The output remains stable with high capacitance
loads (1 μF), a unique ability for an instrumentation amplifier.
Consequently, the AMP01 can amplify low level signals for
transmission through long cables without requiring an output
buffer. The output stage can be configured as a voltage or
current generator.
Input offset voltage is very low (20 μV), which generally
eliminates the external null potentiometer. Temperature changes
have minimal effect on offset; TCVIOS is typically 0.15 μV/°C.
Excellent low frequency noise performance is achieved with a
minimal compromise on input protection. The bias current is
very low, less than 10 nA over the military temperature range.
High common-mode rejection of 130 dB, 16-bit linearity at a
gain of 1000, and 50 mA peak output current are achievable
simultaneously. This combination takes the instrumentation
amplifier one step further towards the ideal amplifier.
AC performance complements the superb dc specifications. The
AMP01 slews at 4.5 V/μs into capacitive loads of up to 15 nF, settles
in 50 μs to 0.01% at a gain of 1000, and boasts a healthy 26 MHz
gain bandwidth product. These features make the AMP01 ideal
for high speed data acquisition systems.
The gain is set by the ratio of two external resistors over a range of
0.1 to 10,000. A very low gain temperature coefficient of 10 ppm/°C
is achievable over the whole gain range. Output voltage swing is
guaranteed with three load resistances: 50 Ω, 500 Ω, and 2 kΩ.
Loaded with 500 Ω, the output delivers ±13.0 V minimum. A
thermal shutdown circuit prevents destruction of the output
transistors during overload conditions.
The AMP01 can also be configured as a high performance
operational amplifier. In many applications, the AMP01 can be
used in place of op amp/power buffer combinations.
FUNCTIONAL BLOCK DIAGRAM
V+
V_IOS
NULL
+V_OP
A1
OUTPUT
250Ω
–IN
250Ω
+IN
Q1
Q2
–V_OP
REFERENCE
R1
47.5kΩ
R_G
R3
47.5kΩ
SENSE
A2
A3
R_S
R2
2.5kΩ
V_OOS
NULL
Figure 1.
R4
2.5kΩ
V–
1 _{Protected under U.S. Patents 4,471,321 and 4,503,381.}
Rev. E
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