Datasheet > AD7821_15

AD7821_15

更新时间： 2024-11-20 01:22:35

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	816K
描述
LC MOS High Speed, P Compatible 8-Bit ADC with Track/Hold Function

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AD7821_15 数据手册

LC²MOS High Speed, ␮P Compatible

8-Bit ADC with Track/Hold Function

AD7821

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Fast Conversion Time: 660 ns Max

100 kHz Track-and-Hold Function

1 MHz Sample Rate

Unipolar and Bipolar Input Ranges

Ratiometric Reference Inputs

No External Clock

Extended Temperature Range Operation

Skinny 20-Lead DlPs, SOIC, and 20-Terminal

Surface-Mount Packages

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The 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 (versus 1.36 µs

for the AD7820) and 100 kHz signal bandwidth (versus 6.4

kHz). The sampling instant is better defined and occurs on the

falling edge of WR or RD. The 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

supply, like the AD7820.

1. Fast Conversion Time

The half-flash conversion technique, coupled with fabrication

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

version time. The conversion time for the WR-RD mode is

660 ns, with 700 ns for the RD mode.

2. Built-In Track-and-Hold

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

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

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

3. Total Unadjusted Error

The AD7821 features an excellent total unadjusted error figure

of less than 1 LSB over the full operating temperature range.

The 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.

4. Unipolar/Bipolar Input Ranges

The AD7821 is specified for single-supply (+5 V) operation

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

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

performance characteristics are given for other input ranges.

The 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.

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.

The AD7821 is fabricated in Linear Compatible CMOS

(LC²MOS), an advanced, mixed technology process combining

precision bipolar circuits with low power CMOS logic. The part

features a low power dissipation of 50 mW.

REV. B

Information furnished by Analog Devices is believed to be accurate and

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

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

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

www.analog.com

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与AD7821_15相关器件

型号	品牌	获取价格	描述	数据表
AD7821BCHIPS	ADI	获取价格	High Speed, µP-Compatible, CMOS, 8-Bit Sampling ADC
AD7821BQ	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821KN	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821KP	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821KPZ	ADI	获取价格	LC2MOS High Speed, P Compatible 8-Bit ADC with Track/Hold Function
AD7821KPZ-REEL	ADI	获取价格	High Speed, µP-Compatible, CMOS, 8-Bit Sampling ADC
AD7821KR	ADI	获取价格	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
AD7821KRZ-REEL	ADI	获取价格	暂无描述
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

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