Precision Amplifiers (Bandwidth < 50 MHz)
Ultralow Offset Voltage (VOS ≤ 250 µV Max) Amplifiers
AD8597/AD8599: Ultralow Distortion, Ultralow Noise Operational Amplifier
The AD8597 (single) and AD8599 (dual) are very low noise, low distortion operational amplifiers ideal for use as preamplifiers. The low noise of 1.1 nV/√Hz
and low harmonic distortion of −120 dB (or better) at audio bandwidths give the devices the wide dynamic range necessary for preamplifiers in audio,
medical, and instrumentation applications. The excellent slew rate of 14 V/µs and 10 MHz gain bandwidth make them highly suitable for medical
applications. The low distortion and fast settling time make them ideal for buffering of high resolution data converters.
Features
100
•ꢀLow noise: 1.1 nV/√Hz at 1 kHz
AD8599
ꢀ5V ≤ V ≤ ꢀ15V
•ꢀLow distortion: –120 dB THD @ 1 kHz
•ꢀBandwidth: 10 MHz
SY
•ꢀSupply current: 4.8 mA/amp typical
•ꢀLow offset voltage: 10 µV typical
•ꢀCMRR: 120 dB
10
Applications
1
•ꢀProfessional audio preamplifiers
•ꢀATE/precision testers
•ꢀImaging systems
•ꢀMedical/physiologic measurements
•ꢀPrecision data conversion
0.1
1
10
100
FREQUENCY (Hz)
1k
Voltage noise density vs. frequency.
AD8622: Dual, Low Power, Low Noise, Precision Amplifier
The AD8622 is a dual, precision, rail-to-rail output operational amplifier with a low supply current of only 350 µA maximum over temperature and supply
voltage. It also offers ultralow offset, drift, and voltage noise combined with very low input bias current over the full operating temperature range. It is
perfectly suited for applications where large error sources cannot be tolerated.
Features
C2
U1 = AD8622
1.8ꢁF
•ꢀVery low offset voltage: 125 µA maximum
•ꢀSupply current: 215 µA/amp typical
•ꢀInput bias current: 200 pA maximum
C4
1.8ꢁF
R1
2.67kꢀ
R2
6.49kꢀ
+V
SY
V
R5
R6
IN
C1
8.2ꢁF
2.87kꢀ 6.04kꢀ
+V
V1
1/2
U1
SY
•ꢀLow input offset voltage drift: 1.2 µV/°C
maximum
C3
V2
1/2
U1
8.2ꢁF
R3
1kꢀ
–V
SY
R7
1kꢀ
–V
SY
R4
9.09kꢀ
•ꢀVery low voltage noise: 11 nV/√Hz
SECTION A
R8
9.09kꢀ
Applications
SECTION B
•ꢀPortable precision instrumentation
•ꢀLaser diode control loops
•ꢀMedical instrumentation
•ꢀStrain gage amplifier
•ꢀThermocouple amplifiers
C6
5.6ꢁF
U2 = ADA4062-2
C8
10ꢁF
R9
R10
2.87kꢀ 23.2kꢀ
+V
–V
SY
R11
R12
C5
680nF
4.75kꢀ 29.4kꢀ
+V
V3
1/2
U2
SY
C7
180nF
1/2
U2
V
OUT
SY
–V
SY
SECTION C
SECTION D
Circuit Note CN-0127, 8-Pole Active Low-Pass Filter Optimized for Precision, Low Noise, and
High Gain Reference Circuit, www.analog.com/CN0127.
Operational Amplifier Selection Guide
18
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ADI [ ADI ]
