AD8655 Datasheet, PDF (1/20 Pages) Analog Devices – Low Noise, Precision CMOS Amplifier

FEATURES
Low noise: 2.7 nV/√Hz @ f = 10 kHz
Low offset voltage: 250 μV max over VCM
Offset voltage drift: 0.4 μV/°C typ and 2.3 μV/°C max
Bandwidth: 28 MHz
Rail-to-rail input/output
Unity gain stable
2.7 V to 5.5 V operation
−40°C to +125°C operation
APPLICATIONS
ADC and DAC buffers
Audio
Industrial controls
Precision filters
Digital scales
Strain gauges
PLL filters
GENERAL DESCRIPTION
The AD8655/AD8656 are the industry’s lowest noise, precision
CMOS amplifiers. They leverage the Analog Devices DigiTrim®
technology to achieve high dc accuracy.
The AD8655/AD8656 provide low noise (2.7 nV/√Hz @ 10 kHz),
low THD + N (0.0007%), and high precision performance
(250 μV max over VCM) to low voltage applications. The ability
to swing rail-to-rail at the input and output enables designers
to buffer analog-to-digital converters (ADCs) and other wide
dynamic range devices in single-supply systems.
Low Noise,
Precision CMOS Amplifier
AD8655/AD8656
PIN CONFIGURATIONS
NC 1
–IN 2
+IN 3
V– 4
AD8655
TOP VIEW
(Not to Scale)
8 NC
7 V+
6 OUT
5 NC
NC = NO CONNECT
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8656
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 1. AD8655
8-Lead MSOP (RM-8)
Figure 2. AD8656
8-Lead MSOP (RM-8)
NC 1
8 NC
–IN 2 AD8655 7 V+
+IN 3 TOP VIEW 6 OUT
V– 4 ^{(Not to Scale)} 5 NC
NC = NO CONNECT
Figure 3. AD8655
8-Lead SOIC (R-8)
OUT A 1
8 V+
–IN A 2 AD8656 7 OUT B
+IN A 3 TOP VIEW 6 –IN B
V– 4 ^{(Not to Scale)} 5 +IN B
Figure 4. AD8656
8-Lead SOIC (R-8)
The high precision performance of the AD8655/AD8656
improves the resolution and dynamic range in low voltage
applications. Audio applications, such as microphone pre-amps
and audio mixing consoles, benefit from the low noise, low
distortion, and high output current capability of the AD8655/
AD8656 to reduce system level noise performance and maintain
audio fidelity. The high precision and rail-to-rail input and
output of the AD8655/AD8656 benefit data acquisition, process
controls, and PLL filter applications.
The AD8655/AD8656 are fully specified over the −40°C to
+125°C temperature range. The AD8655/AD8656 are available
in Pb-free, 8-lead MSOP and SOIC packages.
Rev. A
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