AD7829BRU Analog Devices, AD7829BRU Datasheet

AD7829BRU

Manufacturer Part Number

AD7829BRU

Description

Manufacturer

Analog Devices

Datasheets

1.AD7829BR-REEL7.pdf (28 pages)

2.AD7829BRU.pdf (18 pages)

Specifications of AD7829BRU

Case

TSSOP

02+

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GENERAL DESCRIPTION

The AD7822, AD7825, and AD7829 are high speed, 1-, 4-, and

8-channel, microprocessor-compatible, 8-bit analog-to-digital

converters with a maximum throughput of 2 MSPS. The AD7822,

AD7825, and AD7829 contain an on-chip reference of 2.5 V

(2% tolerance), a track/hold amplifier, a 420 ns 8-bit half-flash

ADC and a high speed parallel interface. The converters can

operate from a single 3 V

The AD7822, AD7825, and AD7829 combine the convert start

and power-down functions at one pin, i.e., the CONVST pin.

This allows a unique automatic power-down at the end of a

conversion to be implemented. The logic level on the CONVST

pin is sampled after the end of a conversion when an EOC (End

of Conversion) signal goes high, and if it is logic low at that

point, the ADC is powered down. The AD7822 and AD7825

also have a separate power-down pin. (See Operating Modes

section of the data sheet.)

The parallel interface is designed to allow easy interfacing to

microprocessors and DSPs. Using only address decoding logic,

the parts are easily mapped into the microprocessor address

space. The EOC pulse allows the ADCs to be used in a stand-

alone manner. (See Parallel Interface section of the data sheet.)

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.

FEATURES

8-Bit Half-Flash ADC with 420 ns Conversion Time

1, 4 and 8 Single-Ended Analog Input Channels

On-Chip Track-and-Hold

SNR Performance Given for Input Frequencies Up to

On-Chip Reference (2.5 V)

Automatic Power-Down at the End of Conversion

Wide Operating Supply Range

Input Ranges

Flexible Parallel Interface with EOC Pulse to Allow

APPLICATIONS

Data Acquisition Systems, DSP Front Ends

Disk Drives

Mobile Communication Systems, Subsampling

Available with Input Offset Adjust

10 MHz

3 V

0 V to 2 V p-p, V

0 V to 2.5 V p-p, V

Stand-Alone Operation

Applications

10% and 5 V

= 3 V

10% and 5 V

= 5 V

10%

10% supply.

3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel

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

Tel: 781/329-4700

Fax: 781/326-8703

The AD7822 and AD7825 are available in a 20-/24-lead 0.3"

wide, plastic dual-in-line package (DIP), a 20-/24-lead small

outline IC (SOIC) and a 20-/24-lead thin shrink small outline

package (TSSOP). The AD7829 is available in a 28-lead 0.6"

wide, plastic dual-in-line package (DIP), a 28-lead small outline

IC (SOIC) and in a 28-lead thin shrink small outline package

(TSSOP).

PRODUCT HIGHLIGHTS

1. Fast Conversion Time

2. Analog Input Span Adjustment

3. FPBW (Full Power Bandwidth) of Track and Hold

4. Channel Selection

IN2*

IN3*

IN4*

IN5*

IN6*

IN7*

IN8*

IN1

The AD7822, AD7825, and AD7829 have a conversion time

of 420 ns. Faster conversion times maximize the DSP pro-

cessing time in a real time system.

The V

feature can reduce the requirements of single supply op amps

and take into account any system offsets.

The track-and-hold amplifier has an excellent high frequency

performance. The AD7822, AD7825, and AD7829 are

capable of converting full-scale input signals up to a fre-

quency of 10 MHz. This makes the parts ideally suited to

subsampling applications.

Channel selection is made without the necessity of writing to

the part.

*A0, A1

*A2

*PD

CONVST

IN2

IN4

INPUT

MID

AD7822/AD7825/AD7829

MUX

TO V

FUNCTIONAL BLOCK DIAGRAM

EOC

IN4

IN8

pin allows the user to offset the input span. This

CONTROL

T/H

AD7825/AD7829

AD7829

AD7822/AD7825

AD7825/AD7829

AD7829

MID

LOGIC

A0* A1* A2*

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

AGND

FLASH

HALF

8-BIT

ADC

DGND

PD*

Sampling ADCs

COMP

PARALLEL

BUF

PORT

2.5V

REF

VREF

DB7

DB0

/REF

OUT

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