AD7821KR

更新时间： 2024-01-03 23:15:18

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	251K
描述
LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function

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技术参数
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AD7821KR 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	20
Reach Compliance Code：	unknown	风险等级：	5.69
最大模拟输入电压：	2.5 V	最小模拟输入电压：	-2.5 V
最长转换时间：	0.66 µs	转换器类型：	ADC, FLASH METHOD
JESD-30 代码：	R-GDIP-T20	JESD-609代码：	e0
最大线性误差 (EL)：	0.39%	湿度敏感等级：	NOT APPLICABLE
标称负供电电压：	-5 V	模拟输入通道数量：	1
位数：	8	功能数量：	1
端子数量：	20	最高工作温度：	125 °C
最低工作温度：	-55 °C	输出位码：	BINARY, OFFSET BINARY
输出格式：	PARALLEL, 8 BITS	封装主体材料：	CERAMIC, GLASS-SEALED
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT APPLICABLE
采样速率：	1 MHz	采样并保持/跟踪并保持：	TRACK
座面最大高度：	5.08 mm	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
温度等级：	MILITARY	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT APPLICABLE
宽度：	7.62 mm	Base Number Matches：	1

AD7821KR 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

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与AD7821KR相关器件

型号	品牌	描述	获取价格	数据表
AD7821KRZ-REEL	ADI	暂无描述	获取价格
AD7821TE	ADI	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function	获取价格
AD7821TE/883B	ETC	Analog-to-Digital Converter， 8-Bit	获取价格
AD7821TQ	ADI	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function	获取价格
AD7821TQ/883B	ETC	Analog-to-Digital Converter， 8-Bit	获取价格
AD7822	ADI	3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs	获取价格

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