EVAL-AD7923CB2 AD [Analog Devices], EVAL-AD7923CB2 Datasheet

EVAL-AD7923CB2

Manufacturer Part Number

EVAL-AD7923CB2

Description

4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP

Manufacturer

AD [Analog Devices]

Datasheet

1.EVAL-AD7923CB2.pdf (20 pages)

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GENERAL DESCRIPTION

The AD7923 is a 12-bit, high speed, low power, 4-channel,

successive approximation ADC. The part operates from a single

2.7 V to 5.25 V power supply and features throughput rates up

to 200 kSPS. The part contains a low noise, wide bandwidth

track-and-hold amplifier that can handle input frequencies in

excess of 8 MHz.

The conversion process and data acquisition are controlled using

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

interface with microprocessors or DSPs. The input signal is

sampled on the falling edge of CS and the conversion is also

initiated at this point. There are no pipeline delays associated

with the part.

The AD7923 uses advanced design techniques to achieve very low

power dissipation at maximum throughput rates. At maximum

throughput rates, the AD7923 consumes 1.2 mA maximum with 3 V

supplies, and with 5 V supplies the current consumption is 1.5 mA

maximum.

Through the configuration of the Control Register, the analog

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

to 2 ¥ REF

output coding. The AD7923 features four single-ended analog

inputs with a channel sequencer to allow a preprogrammed

selection of channels to be converted sequentially.

The conversion time for the AD7923 is determined by the SCLK

frequency, as this is also used as the master clock to control the

conversion. The conversion time may be as short as 800 ns with

a 20 MHz SCLK.

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. 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.

FEATURES

Fast Throughput Rate: 200 kSPS

Specified for AV

Low Power:

4 (Single-Ended) Inputs with Sequencer

Wide Input Bandwidth:

Flexible Power/Serial Clock Speed Management

No Pipeline Delays

High Speed Serial Interface SPI™/QSPI™/

Shutdown Mode: 0.5 A Max

16-Lead TSSOP Package

3.6 mW Max at 200 kSPS with 3 V Supply

7.5 mW Max at 200 kSPS with 5 V Supply

70 dB Min SNR at 50 kHz Input Frequency

MICROWIRE™/DSP Compatible

, with either straight binary or twos complement

of 2.7 V to 5.25 V

or 0 V

with Sequencer in 16-Lead TSSOP

4-Channel, 200 kSPS, 12-Bit ADC

REF

PRODUCT HIGHLIGHTS

1. High Throughput with Low Power Consumption.

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

3. Single-Supply Operation with V

4. Flexible Power/Serial Clock Speed Management.

5. No Pipeline Delay.

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

Tel: 781/329-4700

Fax: 781/326-8703

•

The AD7923 offers up to 200 kSPS throughput rates. At the

maximum throughput rate with 3 V supplies, the AD7923

dissipates just 3.6 mW of power maximum.

A consecutive sequence of channels, through which the ADC

will cycle and convert on, can be selected.

The AD7923 operates from a single 2.7 V to 5.25 V supply.

The V

directly to either 3 V or 5 V processor systems independent of AV

The conversion rate is determined by the serial clock, allowing

the conversion time to be reduced through the serial clock speed

increase. The part also features various shutdown modes to

maximize power efficiency at lower throughput rates. Current

consumption is 0.5 mA maximum when in full shutdown.

The part features a standard successive approximation ADC

with accurate control of the sampling instant via a CS input

and once off conversion control.

DRIVE

MUX

FUNCTIONAL BLOCK DIAGRAM

I/P

function allows the serial interface to connect

AD7923

SEQUENCER

T/H

GND

DRIVE

APPROXIMATION

CONTROL LOGIC

SUCCESSIVE

12-BIT

Function.

ADC

AD7923

www.analog.com

SCLK

DOUT

DIN

DRIVE

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