FN8273 Rev 1.00

Page 1 of 23

September 5, 2013

FN8273

Rev 1.00

September 5, 2013

ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329

12-Bit, 250kSPS Low-Power ADCs with Single-Ended and Differential Inputs and Multiple Input

Channels

DATASHEET

The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324,

ISL26325 and ISL26329 family of sampling SAR-type ADCs

feature excellent linearity over supply and temperature

variations, and offer versions with 1-, 2-, 4- and 8-channel

single-ended inputs, and 1-, 2- and 4-channel differential

inputs. A proprietary input multiplexer and combination buffer

amplifier reduces the input drive requirements, resulting in

lower cost and reduced board space. Specified measurement

Members of the The ISL26320, ISL26321, ISL26322,

ISL26323, ISL26324, ISL26325 and ISL26329 family of

Low-Power ADCs offer pinout intercompatibility, differing only

in the analog inputs, to support quick replication of proven

layouts across multiple design platforms.

The serial digital interface is SPI compatible and is easily

interfaced to popular FPGAs and microcontrollers. Power

consumption is limited to 15mW at a sampling rate of

250kSPS, and an operating current of just 8µA typical

between conversions, when configured for Auto Power-down

mode.

The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324,

ISL26325 and ISL26329 feature up to 5kV Human Body

Model ESD survivability and are available in the popular SOIC

and TSSOP packages. Performance is specified for operation

over the full industrial temperature range (-40°C to +125°C).

Features

• Pin-compatible family allows easy design upgrades

• Excellent differential non-linearity (0.7LSB max)

• Low THD: -86dB (typ)

• Simple SPI-compatible serial digital interface

• Low 3mA operating current

• Power-down current between conversions 8µA (typ)

• +5.25V to +2.7V supply

• Excellent ESD survivability: 5kV HBM, 350V MM, 2kV CDM

Applications

• Industrial process control

•Energy measurement

• Multichannel data acquisition systems

• Pressure sensors

• Flow controllers

FIGURE 1. FUNCTIONAL BLOCK DIAGRAM

OSC

ADC

MUX

SPI

POR

ANALOG INPUTS

DIFFERENTIAL/

SINGLE-ENDED

VREF

VDD

CNV

SCLK

SDO

SDI

GND

BUFFER