AD7878

更新时间： 2024-11-22 22:53:31

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 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	获取价格	描述	数据表
AD7878AQ	ADI	获取价格	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface
AD7878AQ	ROCHESTER	获取价格	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CDIP28, HERMETIC SEALED, CERDIP-28
AD7878BQ	ADI	获取价格	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface
AD7878JN	ADI	获取价格	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface
AD7878JNZ	ROCHESTER	获取价格	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDIP28, PLASTIC, DIP-28
AD7878JP	ADI	获取价格	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface
AD7878JP	ROCHESTER	获取价格	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC28, PLASTIC, LCC-28
AD7878JP-REEL	ADI	获取价格	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC28, PLASTIC, LCC-28
AD7878JPZ	ROCHESTER	获取价格	1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC28, PLASTIC, LCC-28
AD7878KN	ADI	获取价格	LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface

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