16-Bit, 16-Channel, 500 kSPS/1 MSPS,
Easy Drive Multiplexed SAR ADCs
AD4695/AD4696
Data Sheet
FEATURES
GENERAL DESCRIPTION
Easy Drive
The AD4695/AD4696 are compact, high accuracy, low power,
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
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.
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
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).
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
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.
1.14 V to 1.98 V logic interface
Wide operating temperature range: −40°C to +125°C
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.
APPLICATIONS
Photodiode monitoring
Medical instrumentation
Vital signs monitoring
Electronic test and measurement
Automated test equipment
Instrumentation and process control
Battery-powered equipment
Rev. 0
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