AD7821KRZ-REEL

更新时间： 2024-11-19 13:02:27

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AD7821KRZ-REEL 数据手册

LC MOS High Speed, ␮P-Compatible

8-Bit ADC with Track/Hold Function

AD7821

FEATURES

FUNCTIO NAL BLO CK D IAGRAM

Fast Conversion Tim e: 660 ns m ax

100 kHz Track-and-Hold Function

1 MHz Sam ple Rate

Unipolar and Bipolar Input Ranges

Ratiom etric Reference Inputs

No External Clock

Extended Tem perature Range Operation

Skinny 20-Pin DlPs, SOIC and 20-Term inal

Surface Mount Packages

GENERAL D ESCRIP TIO N

P RO D UCT H IGH LIGH TS

T he AD7821 is a high speed, 8-bit, sampling, analog-to-digital

converter that offers improved performance over the popular

AD7820. It offers a conversion time of 660 ns (vs. 1.36 µs for

the AD7820) and 100 kHz signal bandwidth (vs. 6.4 kHz). T he

sampling instant is better defined and occurs on the falling edge

of WR or RD. T he provision of a V_SSpin (Pin 19) allows the

part to operate from ±5 V supplies and to digitize bipolar input

signals. Alternatively, for unipolar inputs, the V_SSpin can be

grounded and the AD7821 will operate from a single +5 V sup-

ply, like the AD7820.

1. Fast Conversion T ime

T he half-flash conversion technique, coupled with fabrication

on Analog Devices’ LC²MOS process, enables a very fast con-

version time. T he conversion time for the WR-RD mode is

660 ns, with 700 ns for the RD mode.

2. Built-In T rack-and-Hold

T his allows input signals with slew rates up to 1.6 V/µs to be

converted to 8-bits without an external track-and-hold. T his

corresponds to a 5 V peak-to-peak, 100 kHz sine wave signal.

3. T otal Unadjusted Error

T he AD7821 has a built-in track-and-hold function capable of

digitizing full-scale signals up to 100 kHz max. It also uses a

half-flash conversion technique that eliminates the need to gen-

erate a CLK signal for the ADC.

T he AD7821 features an excellent total unadjusted error fig-

ure of less than ±1 LSB over the full operating temperature

range.

4. Unipolar/Bipolar Input Ranges

T he AD7821 is designed with standard microprocessor control

signals (CS, RD, WR, RDY, INT) and latched, three-state data

outputs capable of interfacing to high speed data buses. An

overflow output (OFL) is also provided for cascading devices to

achieve higher resolution.

T he AD7821 is specified for single supply (+5 V) operation

with a unipolar full-scale range of 0 to +5 V, and for dual sup-

ply (±5 V) operation with a bipolar input range of ±2.5 V.

T ypical performance characteristics are given for other input

ranges.

T he AD7821 is fabricated in Linear-Compatible CMOS

(LC²MOS), an advanced, mixed technology process combining

precision bipolar circuits with low power CMOS logic. T he part

features a low power dissipation of 50 mW.

5. Dynamic Specifications for DSP Users

In addition to the traditional ADC specifications, the

AD7821 is specified for ac parameters, including signal-to-

noise ratio, distortion and slew rate.

REV. A

Inform ation furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assum ed by Analog Devices for its

use, nor for any infringem ents of patents or other rights of third parties

which m ay result from its use. No license is granted by im plication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 617/ 329-4700

Fax: 617/ 326-8703

12 3 4 5 6 7...12

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AD7821KRZ-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD7821KR	ADI	完全替代	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function

与AD7821KRZ-REEL相关器件

型号	品牌	获取价格	描述	数据表
AD7821TE	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821TE/883B	ETC	获取价格	Analog-to-Digital Converter， 8-Bit
AD7821TQ	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821TQ/883B	ETC	获取价格	Analog-to-Digital Converter， 8-Bit
AD7822	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
AD7822_06	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822_15	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7822BN	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
AD7822BN	ROCHESTER	获取价格	1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDIP20, 0.300 INCH, PLASTIC, MS-001AD, DIP-2
AD7822BNZ	ADI	获取价格	3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

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