AD7825BRU

更新时间： 2024-09-15 22:53:31

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
18页	218K
描述
3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs

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数据手册
替代型号

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AD7825BRU 数据手册

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

Sampling ADCs

AD7822/AD7825/AD7829

FEATURES

FUNCTIONAL BLOCK DIAGRAM

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

1, 4 and 8 Single-Ended Analog Input Channels

Available with Input Offset Adjust

On-Chip Track-and-Hold

SNR Performance Given for Input Frequencies Up to

10 MHz

A0*

CONVST EOC

A1* A2*

PD*

CONTROL

LOGIC

COMP

2.5V

REF

On-Chip Reference (2.5 V)

IN1

BUF

VREF /REF

Automatic Power-Down at the End of Conversion

Wide Operating Supply Range

3 V ؎ 10% and 5 V ؎ 10%

OUT

IN2*

IN3*

IN4*

IN5*

IN6*

IN7*

IN8*

8-BIT

INPUT

MUX

HALF

FLASH

ADC

T/H

DB7

DB0

Input Ranges

PARALLEL

PORT

0 V to 2 V p-p, V_DD= 3 V ؎ 10%

0 V to 2.5 V p-p, V_DD= 5 V ؎ 10%

Flexible Parallel Interface with EOC Pulse to Allow

Stand-Alone Operation

AGND DGND

CS RD

MID

*A0, A1

*A2

AD7825/AD7829

AD7829

AD7822/AD7825

AD7825/AD7829

AD7829

APPLICATIONS

Data Acquisition Systems, DSP Front Ends

Disk Drives

*PD

TO V

IN2

IN4

IN8

Mobile Communication Systems, Subsampling

Applications

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).

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 ± 10% and 5 V ± 10% supply.

PRODUCT HIGHLIGHTS

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.)

1. Fast Conversion Time

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.

2. Analog Input Span Adjustment

The V_MIDpin allows the user to offset the input span. This

feature can reduce the requirements of single supply op amps

and take into account any system offsets.

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

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.

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.)

4. Channel Selection

Channel selection is made without the necessity of writing to

the part.

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: 781/329-4700

Fax: 781/326-8703

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

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AD7825BRU 替代型号

型号	品牌	替代类型	描述	数据表
AD7825BRUZ-REEL7	ADI	完全替代	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

与AD7825BRU相关器件

型号	品牌	获取价格	描述	数据表
AD7825BRU-REEL	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRU-REEL7	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRUZ1	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRUZ-REEL	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRUZ-REEL1	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRUZ-REEL7	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRUZ-REEL71	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRZ	ROCHESTER	获取价格	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO24, LEAD FREE, MS-013AD, SOIC-24
AD7825BRZ1	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7825BRZ-REEL1	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

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