1

12-Bit, 20kSPS SAR ADC

ISL2671286

The ISL2671286 is a sampling SAR-type ADC which features

excellent linearity over supply and temperature variations, and

provides a drop-in compatible alternative to all ADS1286

performance grades. The robust high impedance input

minimizes errors due to leakage currents, and specified

measurement accuracy is maintained with input signals up to

the supply rails.

The reference accepts inputs between 1.25V to 5.0V, providing

design flexibility in a wide variety of applications. The

ISL2671286 also features up to 8kV Human Body Model ESD

survivability.

The serial digital interface is SPI compatible and is easily

interfaced to all popular FPGAs and microcontrollers.

Operating from a 5V supply, power dissipation is 1.4mW at a

sampling rate of 20kSPS and just 15µW between conversions

utilizing the Auto Power-Down mode. These features make the

ISL2671286 an excellent solution for remote industrial

sensors and battery-powered instruments.

The ISL2671286 is available in an 8 Ld SOIC package and is

specified for operation over the industrial temperature range

of –40°C to +85°C.

Features

• Drop-In Compatible with ADS1286 (All Performance Grades)

• Simple SPI-compatible Serial Digital Interface

• Guaranteed No Missing Codes

• 20kHz Sampling Rate

• +4.50V to +5.25V Supply

• Low 280µA Operating Current (20kSPS)

• Power-down Current between Conversions: 3µA

• Excellent Differential Non-Linearity (0.75LSB Max)

• Low THD: -83dB (Typ)

• Pb-Free (RoHS Compliant)

• Available in SOIC Package

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

-3

-2

-1

0

1

2

3

0

512

1024

1536

2048

2560

3072

3584

4096

CODE

November 1, 2011

FN7863.0

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

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

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.