AD7878

更新时间： 2024-01-11 00:11:49

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	418K
描述
LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface

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AD7878 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	not_compliant	风险等级：	5.92
最大模拟输入电压：	3 V	转换器类型：	A/D CONVERTER
JESD-30 代码：	R-XDIP-T28	JESD-609代码：	e0
标称负供电电压：	-5 V	位数：	12
功能数量：	1	端子数量：	28
最高工作温度：	125 °C	最低工作温度：	-55 °C
输出位码：	OFFSET 2'S COMPLEMENT, 2'S COMPLEMENT	封装主体材料：	CERAMIC
封装代码：	DIP	封装等效代码：	DIP28,.6
封装形状：	RECTANGULAR	封装形式：	IN-LINE
电源：	+-5 V	认证状态：	Not Qualified
子类别：	Analog to Digital Converters	标称供电电压：	5 V
表面贴装：	NO	技术：	BICMOS
温度等级：	MILITARY	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

AD7878 数据手册

LC²MOS Complete 12-Bit

100 kHz Sampling ADC with DSP Interface

AD7878

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Complete ADC with DSP Interface, Comprising:

Track/Hold Amplifier with 2 ␮s Acquisition Time

7 ␮s A/D Converter

3 V Zener Reference

8-Word FIFO and Interface Logic

72 dB SNR at 10 kHz Input Frequency

Interfaces to High Speed DSP Processors, e.g.,

ADSP-2100, TMS32010, TMS32020

41 ns max Data Access Time

Low Power, 60 mW typ

APPLICATIONS

Digital Signal Processing

Speech Recognition and Synthesis

Spectrum Analysis

High Speed Modems

DSP Servo Control

GENERAL DESCRIPTION

The AD7878 is a fast, complete, 12-bit A/D converter with a

versatile DSP interface consisting of an 8-word, first-in, first-out

(FIFO) memory and associated control logic.

PRODUCT HIGHLIGHTS

The FIFO memory allows up to eight samples to be digitized

before the microprocessor is required to service the A/D con-

verter. The eight words can then be read out of the FIFO at

maximum microprocessor speed. A fast data access time of

41 ns allows direct interfacing to DSP processors and high

speed 16-bit microprocessors.

1. Complete A/D Function with DSP Interface

The AD7878 provides the complete function for digitizing

ac signals to 12-bit accuracy. The part features an on-chip

track/hold, on-chip reference and 12-bit A/D converter. The

additional feature of an 8-word FIFO reduces the high soft-

ware overheads associated with servicing interrupts in DSP

processors.

An on-chip status/control register allows the user to program the

effective length of the FIFO and contains the FIFO out of

range, FIFO empty and FIFO word count information.

2. Dynamic Specifications for DSP Users

The AD7878 is fully specified and tested for ac parameters,

including signal-to-noise ratio, harmonic distortion and

intermodulation distortion. Key digital timing parameters

are also tested and specified over the full operating tempera-

ture range.

The analog input of the AD7878 has a bipolar range of ±3 V.

The AD7878 can convert full power signals up to 50 kHz and is

fully specified for dynamic parameters such as signal-to-noise

ratio and harmonic distortion.

The AD7878 is fabricated in Linear Compatible CMOS

(LC²MOS), an advanced, mixed technology process that com-

bines precision bipolar circuits with low power CMOS logic.

The part is available in four package styles, 28-pin plastic and

hermetic dual-in-line package (DIP), leadless ceramic chip

carrier (LCCC) or plastic leaded chip carrier (PLCC).

3. Fast Microprocessor Interface

Data access time of 41 ns is the fastest ever achieved in a

monolithic A/D converter, and makes the AD7878 compat-

ible with all modern 16-bit microprocessors and digital

signal processors.

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: 617/329-4700

Fax: 617/326-8703

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

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与AD7878相关器件

型号	品牌	描述	获取价格	数据表
AD7878AQ	ADI	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface	获取价格
AD7878AQ	ROCHESTER	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CDIP28, HERMETIC SEALED, CERDIP-28	获取价格
AD7878BQ	ADI	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface	获取价格
AD7878JN	ADI	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface	获取价格
AD7878JNZ	ROCHESTER	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDIP28, PLASTIC, DIP-28	获取价格
AD7878JP	ADI	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface	获取价格

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