1

12-Bit Differential Input 200kSPS SAR ADC

ISL267817

The ISL267817 is a 12-bit, 200kSPS sampling SAR-type ADC

which features excellent linearity over supply and temperature

variations, and provides a drop-in compatible alternative to all

ADS7817 performance grades. The robust, fully-differential

input offers high impedance to minimize errors due to leakage

currents, and the specified measurement accuracy is

maintained with input signals up to the supply rails.

The reference accepts inputs between 0.1V to 2.5V, providing

design flexibility in a wide variety of applications. The

ISL267817 also features up to 8kV Human Body Model ESD

survivability.

The serial digital interface is SPI compatible and is easily

interfaced to popular FPGAs and microcontrollers. Operating

from a 5V supply, power dissipation is 2.15mW at a sampling

rate of 200kSPS, and just 25µW between conversions utilizing

the Auto Power-Down mode, making the ISL267817 an

excellent solution for remote industrial sensors and

battery-powered instruments. It is available in the compact,

industry-standard 8 Lead SOIC and MSOP packages and is

specified for operation over the industrial temperature range

(-40°C to +85°C).

Features

• Drop-In Compatible with ADS7817 (All Performance Grades)

• Differential Input

• Simple SPI-compatible Serial Digital Interface

• Guaranteed No Missing Codes

• 200kHz Sampling Rate

• +4.75V to +5.25V Supply

• Low 2.15mW Operating Power (200kSPS)

• Power-down Current between Conversions: 3µA

• Excellent Differential Non-Linearity (1.0LSB max)

• Low THD: -85dB (typ)

• Pb-Free (RoHS Compliant)

• Available in SOIC and MSOP Packages

Applications

• Remote Data Acquisition

• Battery Operated Systems

• Industrial Process Control

• Energy Measurement

• Data Acquisition Systems

• Pressure Sensors

• Flow Controllers

FIGURE 1. BLOCK DIAGRAM

FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE

SERIAL

INTERFACE

+VCC

VREF

GND

+IN

–IN

DCLOCK

DOUT

CS/SHDN

SAR

LOGIC

VREF

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

0

512

1024 1536 2048 2560 3072 3584 4096

April 19, 2012

FN7877.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

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