AD7908BRU-REEL

更新时间： 2024-11-19 22:29:15

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管
页数	文件大小	规格书
24页	574K
描述
8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP

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替代型号

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AD7908BRU-REEL 数据手册

8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs

with Sequencer in 20-Lead TSSOP

AD7908/AD7918/AD7928

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Fast Throughput Rate: 1 MSPS

Specified for AV_DDof 2.7 V to 5.25 V

Low Power:

6.0 mW Max at 1 MSPS with 3 V Supply

13.5 mW Max at 1 MSPS with 5 V Supply

8 (Single-Ended) Inputs with Sequencer

Wide Input Bandwidth:

REF

T/H

•

8-/10-/12-BIT

SUCCESSIVE

APPROXIMATION

ADC

AD7928, 70 dB Min SINAD at 50 kHz Input Frequency

Flexible Power/Serial Clock Speed Management

No Pipeline Delays

I/P

MUX

High Speed Serial Interface SPI^®/QSPI™/

MICROWIRE™/DSP Compatible

Shutdown Mode: 0.5 ␮A Max

20-Lead TSSOP Package

SCLK

DOUT

DIN

CONTROL LOGIC

SEQUENCER

GENERAL DESCRIPTION

The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit,

and 12-bit, high speed, low power, 8-channel, successive

approximation ADCs. The parts operate from a single 2.7 V

to 5.25 V power supply and feature throughput rates up to

1 MSPS. The parts contain a low noise, wide bandwidth track-

and-hold amplifier that can handle input frequencies in excess

of 8 MHz.

AD7908/AD7918/AD7928

DRIVE

GND

PRODUCT HIGHLIGHTS

1. High Throughput with Low Power Consumption.

The conversion process and data acquisition are controlled using

CS and the serial clock signal, allowing the device to easily inter-

face with microprocessors or DSPs. The input signal is sampled

on the falling edge of CS and conversion is also initiated at this

point. There are no pipeline delays associated with the part.

The AD7908/AD7918/AD7928 offer up to 1 MSPS throughput

rates. At the maximum throughput rate with 3 V supplies, the

AD7908/AD7918/AD7928 dissipate just 6 mW of power

maximum.

The AD7908/AD7918/AD7928 use advanced design techniques to

achieve very low power dissipation at maximum throughput rates.

At maximum throughput rates, the AD7908/AD7918/AD7928

consume 2 mA maximum with 3 V supplies; with 5 V supplies, the

current consumption is 2.7 mA maximum.

2. Eight Single-Ended Inputs with a Channel Sequencer.

A sequence of channels can be selected, through which the

ADC will cycle and convert on.

3. Single-Supply Operation with V_DRIVEFunction.

The AD7908/AD7918/AD7928 operate from a single 2.7 V to

5.25 V supply. The V_DRIVEfunction allows the serial interface

to connect directly to either 3 V or 5 V processor systems

Through the configuration of the Control Register, the analog

input range for the part can be selected as 0 V to REF_INor 0 V to

2 ϫ REF_IN, with either straight binary or twos complement out-

put coding. The AD7908/AD7918/AD7928 each feature eight

single-ended analog inputs with a channel sequencer to allow a

preprogrammed selection of channels to be converted sequentially.

independent of AV_DD

4. Flexible Power/Serial Clock Speed Management.

The conversion rate is determined by the serial clock, allowing

the conversion time to be reduced through the serial clock

speed increase. The parts also feature various shutdown

modes to maximize power efficiency at lower throughput rates.

Current consumption is 0.5 µA max when in full shutdown.

The conversion time for the AD7908/AD7918/AD7928 is deter-

mined by the SCLK frequency, which is also used as the master

clock to control the conversion.

5. No Pipeline Delay.

The parts feature a standard successive approximation ADC

with accurate control of the sampling instant via a CS input

and once off conversion control.

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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

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 companies.

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

Tel: 781/329-4700

Fax: 781/326-8703

www.analog.com

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AD7908BRU-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD7908BRUZ-REEL	ADI	完全替代	8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs
AD7908BRUZ	ADI	完全替代	8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs
AD7908BRU	ADI	完全替代	8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP

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