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Data Sheet
FEATURES
Low noise: 2.7 nV/√Hz at 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 Qualified for automotive applications
APPLICATIONS
ADC and DAC buffers Audio Industrial controls Precision filters Digital scales Automotive collision avoidance 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 at 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
05304-048 05304-059
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
Figure 1. AD8655 8-Lead MSOP (RM-8)
8-Lead SOIC (R-8)
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 2. AD8656 8-Lead MSOP (RM-8)
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. The AD8655/ AD8656 are both available for automotive applications.
Rev. E
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AD8655/AD8656
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 15 Applications Information .............................................................. 16
REVISION HISTORY
10/13—Rev. D to Rev. E Changes to Figure 1 Caption and Figure 2 Caption .................... 1 Deleted Figure 3 and Figure 4; Renumbered Sequentially ......... 1 Change to General Description Section ........................................ 1 Change to Figure 4 ........................................................................... 6 Change to Figure 32 ....................................................................... 10 Changes to Ordering Guide .......................................................... 19 Changes to Automotive Products Section................................... 19
6/13—Rev. C to Rev. D Change to Figure 57 ....................................................................... 16
5/13—Rev. B to Rev. C Change to Figure 57 ....................................................................... 16
9/11—Rev. A to Rev. B Changes to Features Section............................................................ 1 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 .