AD7722ASZ Analog Devices Inc, AD7722ASZ Datasheet

AD7722ASZ

Manufacturer Part Number

AD7722ASZ

Description

ADC Single Delta-Sigma 195KSPS 16-Bit Parallel/Serial 44-Pin MQFP

Manufacturer

Analog Devices Inc

Datasheet

1.AD7722AS.pdf (24 pages)

Specifications of AD7722ASZ

Package

44MQFP

Resolution

16 Bit

Sampling Rate

195 KSPS

Architecture

Delta-Sigma

Number Of Analog Inputs

Digital Interface Type

Parallel|Serial (3-Wire)

Input Type

Voltage

Polarity Of Input Voltage

Unipolar|Bipolar

Number Of Bits

Sampling Rate (per Second)

220k

Data Interface

Serial, Parallel

Number Of Converters

Power Dissipation (max)

375mW

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

44-QFP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AD7722ASZ

Manufacturer:

Quantity:

1 450

Company:

BOSTOCK HK LIMITED

Part Number:

AD7722ASZ

Manufacturer:

Analog Devices Inc

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

AD7722ASZ

Manufacturer:

ADI/亚德诺

Quantity:

20 000

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GENERAL DESCRIPTION

The AD7722 is a complete low power, 16-bit, Σ-∆ ADC. The

part operates from a 5 V supply and accepts a differential input

voltage range of 0 V to +2.5 V or ± 1.25 V centered around a

common-mode bias. The AD7722 provides 16-bit performance

for input bandwidths up to 90.625 kHz. The part provides data

at an output word rate of 195.3 kHz.

The analog input is continuously sampled by an analog modula-

tor, eliminating the need for external sample-and-hold circuitry.

The modulator output is processed by two finite impulse response

(FIR) digital filters in series. The on-chip filtering reduces the

external antialias requirements to first order, in most cases. The

group delay for the filter is 215.5 µs, while the settling time for

a step input is 431 µs. The sample rate, filter corner frequency,

and output word rate are set by an external clock that is

nominally 12.5 MHz.

Use of a single bit DAC in the modulator guarantees excellent

linearity and dc accuracy. Endpoint accuracy is ensured on-chip

by calibration. This calibration procedure minimizes the zero-

scale and full-scale errors.

REV. B

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. 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.

FEATURES

16-Bit - ADC

Inherently Monotonic

On-Chip 2.5 V Voltage Reference

Single-Supply 5 V

High Speed Parallel or Serial Interface

Up to 220 kSPS Output Word Rate

Low-Pass, Linear Phase Digital Filter

Oversampling Ratio

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

Tel: 781/329-4700

Fax: 781/326-8703

Conversion data is provided at the output register through a flex-

ible serial port or a parallel port. This offers 3-wire, high speed

interfacing to digital signal processors. The serial interface operates

in an internal clocking (master) mode, whereby an internal serial

data clock and framing pulse are device outputs. Additionally,

two AD7722s can be configured with the serial data outputs

connected together. Each converter alternately transmits its conver-

sion data on a shared serial data line.

The part provides an accurate on-chip 2.5 V reference. A

reference input/output function is provided to allow either the

internal reference or an external system reference to be used as

the reference source for the part.

The AD7722 is available in a 44-lead MQFP package and is

specified over the industrial temperature range of –40°C to +85°C.

CFMT/DRDY

DVAL/ RD

RESET

SYNC

DB0

DB1

DB2

CAL

P/S

(+)

(–)

FUNCTIONAL BLOCK DIAGRAM

DGND

DB3/

TSI

AD7722

DB4/

DOE

AGND

16-BIT A/D CONVERTER

MODULATOR

SFMT

DB5/

CONTROL

16-Bit, 195 kSPS

CMOS, - ADC

LOGIC

DB6/

FSI

REFERENCE

CIRCUITRY

DB7/

REF1

SCO

FILTER

2.5V

CLOCK

FIR

AD7722

DB8/

SDO

www.analog.com

REF2

UNI

DB15

DB14

DB13

DB12

DB11

DB10

DB9/FSO

XTAL

CLKIN

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