AD7822BR-REEL

更新时间： 2024-11-09 12:27:19

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
28页	525K
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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AD7822BR-REEL 数据手册

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

Sampling ADCs

AD7822/AD7825/AD7829

FUNCTIONAL BLOCK DIAGRAM

FEATURES

8-bit half-flash ADC with 420 ns conversion time

One, four, and eight single-ended analog input channels

Available with input offset adjust

On-chip track-and-hold

CONVST EOC A0 A1 A2 PD

CONTROL

LOGIC

COMP

2.5V

REF

SNR performance given for input frequencies up to 10 MHz

On-chip reference (2.5 V)

IN1

BUF

REF IN/OUT

IN2

Automatic power-down at the end of conversion

Wide operating supply range

3 V 10% and 5 V 10%

Input ranges

0 V to 2 V p-p, V_DD= 3 V 10%

IN3

IN4

IN5

IN6

IN7

IN8

8-BIT

INPUT

MUX

HALF

FLASH

ADC

T/H

DB7

DB0

PARALLEL

PORT

MID

0 V to 2.5 V p-p, V_DD= 5 V 10%

AGND DGND

CS RD

EOC

Flexible parallel interface with

standalone operation

pulse to allow

A0, A1

AD7825/AD7829

AD7829

AD7822/AD7825

AD7825/AD7829

AD7829

TO V

IN2

IN5

IN4

IN8

APPLICATIONS

Data acquisition systems, DSP front ends

Disk drives

Figure 1.

Mobile communication systems, subsampling

applications

GENERAL DESCRIPTION

The AD7822 and AD7825 are available in 20-lead and 24-lead,

0.3" wide, plastic dual in-line packages (PDIP); 20-lead and

24-lead standard small outline packages (SOIC); and 20-lead

and 24-lead thin shrink small outline packages (TSSOP). The

AD7829 is available in a 28-lead, 0.6" wide PDIP; a 28-lead

SOIC; and a 28-lead TSSOP.

The AD7822/AD7825/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/AD7829 contain an on-chip reference of 2.5 V

(2% tolerance); a track-and-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

1. Fast Conversion Time. The AD7822/AD7825/AD7829

have a conversion time of 420 ns. Faster conversion times

maximize the DSP processing time in a real-time system.

The AD7822/AD7825/AD7829 combine the convert start and

CONVST

power-down functions at one pin, that is, the

pin.

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

CONVST

conversion to be implemented. The logic level on the

pin is sampled after the end of a conversion when an

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.

EOC

(end

of conversion) signal goes high. 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 the Operating Modes section).

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

The track-and-hold amplifier has an excellent high

frequency performance. The AD7822/AD7825/AD7829

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

frequency 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

EOC

space. The

pulse allows the ADCs to be used in a stand-

alone manner (see the Parallel Interface section.)

4. Channel Selection. Channel selection is made without the

necessity of writing to the part.

Rev. C

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. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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AD7822BR-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD7822BRZ-REEL	ADI	完全替代	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

与AD7822BR-REEL相关器件

型号	品牌	获取价格	描述	数据表
AD7822BR-REEL7	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822BRU	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
AD7822BRU	ROCHESTER	获取价格	1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20, MO-153AC, TSSOP-20
AD7822BRU-REEL	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822BRU-REEL	ROCHESTER	获取价格	1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20, MO-153AC, TSSOP-20
AD7822BRU-REEL7	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822BRU-REEL7	ROCHESTER	获取价格	1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20, MO-153AC, TSSOP-20
AD7822BRUZ	ROCHESTER	获取价格	1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20, LEAD FREE, MO-153AC, TSSOP-20
AD7822BRUZ	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822BRUZ1	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

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