AD4696 datasheet(1/96 Pages) AD

Part #	AD4696

Description	16-Bit, 16-Channel, 500 kSPS/1 MSPS, Easy Drive Multiplexed SAR ADCs

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Manufacturer	AD [Analog Devices]

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16-Bit, 16-Channel, 500 kSPS/1 MSPS,

Easy Drive Multiplexed SAR ADCs

Data Sheet

AD4695/AD4696

Rev. 0

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FEATURES

Easy Drive

Reduced analog input and reference drive requirements

Overvoltage clamp input current protection up to 5 mA on

each analog input

Long acquisition phase, ≥71.5% (715 ns/1000 ns)of cycle

time at 1 MSPS

High performance

Sample rate: 500 kSPS (AD4695) or 1 MSPS (AD4696)

INL: ±1 LSB maximum

Guaranteed 16-bit, no missing codes

SINAD: 93 dB typical, VREF = 5 V and fIN = 1 kHz

Oversampled dynamic range: 111.2 dB, OSR = 64

Small footprint, high channel density

32-lead 5 mm × 5 mm LFCSP

Easy Drive features support system level designs with

fewer components

Enhanced digital functionality

First conversion accurate, no latency or pipeline delay

Fast conversion time and dual-SDO mode allow low

SPI clock rates

Customizable channel sequencer

On-chip oversampling and decimation

Threshold detection alerts

Offset and gain correction

Autonomous conversion (autocycle) mode

SPI-/QPSI-/MICROWIRE-/DSP-compatible serial interface

Low power

8 mW at fS = 1 MSPS

4 mW at fS = 500 kSPS

4 µW standby power dissipation with the internal

LDO disabled

Internal LDO enables 3.15 V to 5.5 V, single analog supply

operation

1.14 V to 1.98 V logic interface

Wide operating temperature range: −40°C to +125°C

APPLICATIONS

Photodiode monitoring

Medical instrumentation

Vital signs monitoring

Electronic test and measurement

Automated test equipment

Instrumentation and process control

Battery-powered equipment

GENERAL DESCRIPTION

The AD4695/AD4696 are compact, high accuracy, low power,

16-channel, 16-bit, 500 kSPS/1 MSPS, multiplexed input

precision, successive approximation register (SAR) analog-to-

digital converters (ADCs) with Easy Drive features and

extensive digital functionality.

The AD4695/AD4696 are optimal for use in space constrained,

multichannel, precision data acquisition systems and monitoring

circuits. The AD4695/AD4696 feature a true 16-bit SAR ADC core

with no missing codes, a 16-channel, low crosstalk multiplexer, a

flexible channel sequencer, overvoltage protection clamp

circuits on each analog input, on-chip oversampling and

decimation, threshold detection and alert indicators, and an

autonomous conversion (autocycle) mode.

The AD4695/AD4696 Easy Drive features relax the drive

requirements of the analog front end (AFE) and reference

circuitry. Analog input high-Z mode and reference input

high-Z mode simplify system designs, reduce component

count, and increase channel density by removing the need for

dedicated high speed ADC drivers and reference buffers.

Input overvoltage protection clamps on each analog input

protect the AD4695/AD4696 from overvoltage events and

prevent overvoltage events on one channel from degrading

performance on other channels (see Figure 26).

Advanced digital functionality makes the AD4695/AD4696

compatible with a variety of low power digital hosts. The low

serial peripheral interface (SPI) clock rate requirements, on-chip

customizable channel sequencers, and oversampling and

decimation reduce the burden on the digital host system.

Autocycle mode and threshold detection features enable low

power, interrupt driven firmware design by performing

conversions autonomously and generating alerts based on

channel specific threshold limits.

The AD4695/AD4696 are available in a 5 mm × 5 mm 32-lead

lead frame chip scale package (LFCSP) with operation specified

from −40°C to +125°C.

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