EVAL-AD7321CB AD [Analog Devices], EVAL-AD7321CB Datasheet

EVAL-AD7321CB

Manufacturer Part Number

EVAL-AD7321CB

Description

500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

Manufacturer

AD [Analog Devices]

Datasheet

1.EVAL-AD7321CB.pdf (36 pages)

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FEATURES

12-bit plus sign SAR ADC

True bipolar input ranges

Software-selectable input ranges

500 kSPS throughput rate

Two analog input channels with channel sequencer

Single-ended, true differential, and pseudo differential

High analog input impedance

Low power: 17 mW

Full power signal bandwidth: 22 MHz

Internal 2.5 V reference

High speed serial interface

Power-down modes

14-lead TSSOP package

iCMOS

GENERAL DESCRIPTION

The AD7321

approximation ADC designed on the iCMOS (industrial

CMOS) process. iCMOS is a process combining high voltage

silicon with submicron CMOS and complementary bipolar

technologies. It enables the development of a wide range of high

performance analog ICs capable of 33 V operation in a footprint

that no previous generation of high voltage parts could achieve.

Unlike analog ICs using conventional CMOS processes, iCMOS

components can accept bipolar input signals while providing

increased performance, dramatically reduced power

consumption, and reduced package size.

The AD7321 can accept true bipolar analog input signals. The

AD7321 has four software-selectable input ranges, ±10 V, ±5 V,

±2.5 V, and 0 V to +10 V. Each analog input channel can be

independently programmed to one of the four input ranges.

The analog input channels on the AD7321 can be programmed

to be single-ended, true differential, or pseudo differential.

The ADC contains a 2.5 V internal reference. The AD7321 also

allows for external reference operation. If a 3 V reference is

applied to the REFIN/OUT pin, the AD7321 can accept a true

bipolar ±12 V analog input. Minimum ±12 V V

supplies are required for the ±12 V input range. The ADC has a

high speed serial interface that can operate at throughput rates

up to 500 kSPS.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

analog input capability

±10 V, ±5 V, ±2.5 V, 0 V to +10 V

™

process technology

is a 2-channel, 12-bit plus sign successive

500 kSPS, 2-Channel, Software-Selectable,

and V

True Bipolar Input, 12-Bit Plus Sign ADC

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

PRODUCT HIGHLIGHTS

Table 1. Similar Devices

Device

Number

AD7329

AD7328

AD7327

AD7324

AD7323

AD7322

Protected by U.S. Patent No. 6,731,232.

The AD7321 can accept true bipolar analog input signals,

±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.

The two analog inputs can be configured as two single-

ended inputs, one true differential input pair, or one

pseudo differential input.

500 kSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-

compatible interface.

Low power, 17 mW, at a maximum throughput rate of

500 kSPS.

Channel sequencer.

AD7321

SEQUENCER

CHANNEL

AGND

MUX

I/P

Throughput

Rate

1000 kSPS

500 kSPS

1000 kSPS

500 kSPS

1000 kSPS

FUNCTIONAL BLOCK DIAGRAM

T/H

Number of bits

12-bit plus sign

Figure 1.

VREF

2.5V

REFIN/OUT

DGND

APPROXIMATION

SUCCESSIVE

CONTROL LOGIC

AND REGISTERS

13-BIT

ADC

AD7321

www.analog.com

Number of

Channels

DOUT

SCLK

DIN

DRIVE

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