AD7811YRUZ PDF资料下载(1/19 页)4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDS

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参数资料

型号：	AD7811YRUZ
厂商：	ANALOG DEVICES INC
元件分类：	ADC
英文描述：	4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封装：	TSSOP-16
文件页数：	1/19页
文件大小：	210K
代理商：	AD7811YRUZ

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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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

AD7811/AD7812

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

Analog Devices, Inc., 2000

2.7 V to 5.5 V, 350 kSPS, 10-Bit

4-/8-Channel Sampling ADCs

FEATURES

10-Bit ADC with 2.3

s Conversion Time

The AD7811 has Four Single-Ended Inputs that

Can Be Configured as Three Pseudo Differential

Inputs with Respect to a Common, or as Two Inde-

pendent Pseudo Differential Channels

The AD7812 has Eight Single-Ended Inputs that Can

Be Configured as Seven Pseudo Differential Inputs

with Respect to a Common, or as Four Independent

Pseudo Differential Channels

Onboard Track and Hold

Onboard Reference 2.5 V

2.5%

Operating Supply Range: 2.7 V to 5.5 V

Specifications at 2.7 V–3.6 V and 5 V

10%

DSP-/Microcontroller-Compatible Serial Interface

High Speed Sampling and Automatic Power-Down Modes

Package Address Pin on the AD7811 and AD7812 Allows

Sharing of the Serial Bus in Multipackage Applications

Input Signal Range: 0 V to VREF

Reference Input Range: 1.2 V to VDD

GENERAL DESCRIPTION

The AD7811 and AD7812 are high speed, low power, 10-bit

A/D converters that operate from a single 2.7 V to 5.5 V supply.

The devices contain a 2.3

s successive approximation A/D

converter, an on-chip track/hold amplifier, a 2.5 V on-chip refer-

ence and a high speed serial interface that is compatible with the

serial interfaces of most DSPs (Digital Signal Processors) and

microcontrollers. The user also has the option of using an exter-

nal reference by connecting it to the VREF pin and setting the

EXTREF bit in the control register. The VREF pin may be tied

to VDD. At slower throughput rates the power-down mode may

be used to automatically power down between conversions.

The control registers of the AD7811 and AD7812 allow the

input channels to be configured as single-ended or pseudo

differential. The control register also features a software convert

start and a software power-down. Two of these devices can

share the same serial bus and may be individually addressed in

a multipackage application by hardwiring the device address pin.

The AD7811 is available in a small, 16-lead 0.3" wide, plastic

dual-in-line package (mini-DIP), in a 16-lead 0.15" wide, Small

Outline IC (SOIC) and in a 16-lead, Thin Shrink Small Out-

line Package (TSSOP). The AD7812 is available in a small,

20-lead 0.3" wide, plastic dual-in-line package (mini-DIP), in a

20-lead, Small Outline IC (SOIC) and in a 20-lead, Thin Shrink

Small Outline Package (TSSOP).

PRODUCT HIGHLIGHTS

1. Low Power, Single Supply Operation

Both the AD7811 and AD7812 operate from a single 2.7 V

to 5.5 V supply and typically consume only 10 mW of power.

The power dissipation can be significantly reduced at

lower throughput rates by using the automatic power-

down mode e.g., 315

W @ 10 kSPS, V

DD = 3 V—see

Power vs. Throughput.

2. 4-/8-Channel, 10-Bit ADC

The AD7811 and AD7812 have four and eight single-ended

input channels respectively. These inputs can be configured

as pseudo differential inputs by using the Control Register.

3. On-chip 2.5 V (

±2.5%) reference circuit that is powered

down when using an external reference.

4. Hardware and Software Control

The AD7811 and AD7812 provide for both hardware and

software control of Convert Start and Power-Down.

FUNCTIONAL BLOCK DIAGRAMS

REV. B

CHARGE

REDISTRIBUTION

DAC

CLOCK

OSC

AD7811

CONVST

AGND

VDD/3

COMP

REFIN

VDD

DOUT

DGND

VIN1

VIN2

VIN3

VIN4

DIN

RFS

TFS

SCLK

BUF

CONTROL

LOGIC

MUX

CREF

SERIAL

PORT

1.23V

REF