Datasheet > EVAL-AD7891-2CB

EVAL-AD7891-2CB

更新时间： 2024-11-27 05:20:43

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	382K
描述
Evaluation Board for Single Supply, 12-Bit 500 kSPS ADC

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中文翻译

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数据手册

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EVAL-AD7891-2CB 数据手册

Evaluation Board for Single Supply,

12-Bit 500 kSPS ADC

EVAL-AD7891-2CB

FEATURES

Interfacing to this board is through a 9-way D-type connector

and a 96-way connector. This 96-way connector is compatible

with the EVAL-CONTROL BOARD which is also available

from Analog Devices. External sockets are provided for the

conversion start input, analog inputs and an external reference

input option.

Full-Featured Evaluation Board for the AD7891-2

EVAL-CONTROL BOARD Compatible

Stand Alone Capability

On-Board Analog Buffering and Reference

Various Linking Options

OPERATING THE AD7891-2 EVALUATION BOARD

Power Supplies

PC Software for Control and Data Analysis when used

with EVAL-CONTROL BOARD

This evaluation board has four analog power supply inputs:

V_DD, DGND, +12 V and -12 V. The VDD supply is nominally

+5 V and is used to power the AD7891-2 and the on-board

digital integrated circuits. The +12 V and -12 V supplies are

used to power the AD713 quad op-amps and the AD780 voltage

reference and the reference buffer. The DGND connection is to

the digital ground plane. This DGND ground plane connects to

the AGND ground plane at the AD7891-2. Therefore, it is

recommended not to connect AGND and DGND elsewhere in

the system. The various analog and digital supplies are provided

through the power-supply terminals on the board. When using

the AD7891-2 evaluation board with the EVAL-CONTROL

BOARD, all supplies are provided by the EVAL-CONTROL

BOARD.

INTRODUCTION

This Application Note describes the evaluation board for the

AD7891-2 12-Bit A/D converter. The AD7891-2 is an eight

channel data acquisition system that operates from a single +5 V

supply and accepts input signals in the ranges 0 to +5 V , 0 to

+2.5 V or ±2.5 V. It incorporates an input multiplexer, an on

chip track/hold amplifier, an internal +2.5 V reference and on-

chip versatile interface structures that allow both serial and

parallel connection to a microprocessor. This flexible serial

interface allows the AD7891-2 to connect directly to Digital

Signal Processors (ADSP-2101, DSP56001, etc.) and Micro-

controllers (8XC51, 68HC11, etc.). Full data on the AD7891-

2 is available in the AD7891 data sheet available from Analog

Devices and should be consulted in conjunction with this

Application Note when using the Evaluation Board.

All supplies are decoupled to ground with 10µF tantalum and

0.1µF ceramic disc capacitors. The +12 V and -12 V supplies

for the amplifiers are decoupled to the AGND plane while the

AV_DDsupply for the AD7891 is decoupled to the AGND plane

through a 10 µF capacitor and to the DGND plane through a

0.1 µF capacitor.

On-board components include an AD780 which is a pin

programmable +2.5 V or +3V ultra high precision bandgap

reference, a buffer amplifier to buffer the reference when using

inputs in the ±2.5 V range and two AD713 quad op-amps to

buffer the analog inputs.

FUNCTIONAL BLOCK DIAGRAM

AIN 8

Conversion

Start Input

9-Way

D-Type

Connector

AD7891-2

ADC

Range

Selection

Jumpers

Analog

Inputs

AD7891-1

Evaluation

Board

AD780

Reference

AIN 1

Reference

Input

(+2.5 V)

REV. A

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.

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

Tel: 617/329-4700 Fax: 617/326-8703

12 3 4 5 6 7...12

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与EVAL-AD7891-2CB相关器件

型号	品牌	获取价格	描述	数据表
EVAL-AD7892-2CB	ADI	获取价格	LC2MOS Single Supply, 12-Bit 600 kSPS ADC
EVAL-AD7892-3CB	ADI	获取价格	LC2MOS Single Supply, 12-Bit 600 kSPS ADC
EVAL-AD7898CB	ADI	获取价格	Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package
EVAL-AD7899CB	ADI	获取价格	Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package
EVAL-AD7910CB	ADI	获取价格	250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
EVAL-AD7912_15	ADI	获取价格	Evaluation Board for 1 MSPS, 2-Channel, 12-/10-Bit ADCs
EVAL-AD7915SDZ	ADI	获取价格	EVAL BOARD AD7915SDZ
EVAL-AD7916SDZ	ADI	获取价格	EVAL BOARD AD7916SDZ
EVAL-AD7920CB	ADI	获取价格	250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
EVAL-AD7922_15	ADI	获取价格	Evaluation Board for 1 MSPS, 2-Channel, 12-/10-Bit ADCs

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