AD1895AYRS

更新时间： 2024-11-20 23:14:15

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
24页	1104K
描述
192 kHz Stereo Asynchronous Sample Rate Converter

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AD1895AYRS 数据手册

192 kHz Stereo Asynchronous

Sample Rate Converter

AD1895^*

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Automatically Senses Sample Frequencies

No Programming Required

VDD_IO VDD_CORE

RESET

Attenuates Sample Clock Jitter

3.3 V to 5 V Input and 3.3 V Core Supply Voltages

Accepts 16-/18-/20-/24-Bit Data

Up to 192 kHz Sample Rate

Input/Output Sample Ratios from 7.75:1 to 1:8

Bypass Mode

Multiple AD1895 TDM Daisy-Chain Mode

128 dB Signal-to-Noise and Dynamic Range

(A-Weighted, 20 Hz to 20 kHz BW)

Up to –122 dB THD + N

AD1895

MUTE_IN

OUT

SDATA_I

SCLK_I

LRCLK_I

SDATA_O

SCLK_O

LRCLK_O

FIFO

SERIAL

INPUT

SMODE_IN_0

SMODE_IN_1

SMODE_IN_2

TDM_IN

SERIAL

OUTPUT

FIR

FILTER

SMODE_OUT_0

SMODE_OUT_1

DIGITAL

PLL

BYPASS

MUTE_OUT

WLNGTH_OUT_0

WLNGTH_OUT_1

Linear Phase FIR Filter

CLOCK DIVIDER

MMODE_0

ROM

Hardware Controllable Soft Mute

Supports 256

f_S, 512

f_S, or 768

f_SMaster Mode

Clock

Flexible 3-Wire Serial Data Port with Left-Justified,

I²S, Right-Justified (16-, 18-, 20-, 24-Bit), and TDM

Serial Port Modes

MCLK_IN

MMODE_2

MCLK_OUT

MMODE_1

a digital signal processor. The serial output data is dithered down

to 20, 18, or 16 bits when 20-, 18-, or 16-bit output data is

selected. The AD1895 sample rate converts the data from the

serial input port to the sample rate of the serial output port. The

sample rate at the serial input port can be asynchronous with

respect to the output sample rate of the output serial port. The

master clock to the AD1895, MCLK, can be asynchronous to

both the serial input and output ports.

Master/Slave Input and Output Modes

28-Lead SSOP Plastic Package

APPLICATIONS

Home Theater Systems, Automotive Audio Systems,

DVD, DVD-R, CD-R, Set-Top Boxes, Digital Audio

Effects Processors

MCLK can either be generated off-chip or on-chip by the AD1895

master clock oscillator. Since MCLK can be asynchronous to the

input or output serial ports, a crystal can be used to generate

MCLK internally to reduce noise and EMI emissions on the

board. When MCLK is synchronous to either the output or input

serial port, the AD1895 can be configured in a master mode where

MCLK is divided down and used to generate the left/right

and bit clocks for the serial port that is synchronous to MCLK.

The AD1895 supports master modes of 256 × f_S, 512 × f_S, and

768 × f_Sfor both input and output serial ports.

PRODUCT OVERVIEW

The AD1895 is a 24-bit, high performance, single-chip, second

generation asynchronous sample rate converter. Based upon

Analog Devices’ experience with its first asynchronous sample

rate converter, the AD1890, the AD1895 offers improved perfor-

mance and additional features. This improved performance

includes a THD + N range of –115 dB to –122 dB depending

on sample rate and input frequency, 128 dB (A-Weighted)

dynamic range, 192 kHz sampling frequencies for both input and

output sample rates, improved jitter rejection, and 1:8 upsampling

and 7.75:1 downsampling ratios. Additional features include

more serial formats, a bypass mode, and better interfacing to

digital signal processors.

Conceptually, the AD1895 interpolates the serial input data by

a rate of 2²⁰and samples the interpolated data stream by the

output sample rate. In practice, a 64-tap FIR filter with 2²⁰

polyphases, a FIFO, a digital servo loop that measures the time

difference between input and output samples within 5 ps, and a

digital circuit to track the sample rate ratio are used to perform

the interpolation and output sampling. Refer to the Theory of

Operation section. The digital servo loop and sample rate ratio

circuit automatically track the input and output sample rates.

(continued on page 15)

The AD1895 has a 3-wire interface for the serial input and

output ports that supports left-justified, I²S, and right-justified

(16-, 18-, 20-, 24-bit) modes. Additionally, the serial output

port supports TDM Mode for daisy-chaining multiple AD1895s to

*Patents pending.

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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中文翻译

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AD1895AYRS 替代型号

型号	品牌	替代类型	描述	数据表
AD1895AYRSRL	ADI	完全替代	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRSZ	ADI	功能相似	192 kHZ Stereo Asynchronous Sample Rate Converter
AD1895AYRSZRL	ADI	功能相似	192 kHZ Stereo Asynchronous Sample Rate Converter

与AD1895AYRS相关器件

型号	品牌	获取价格	描述	数据表
AD1895AYRSRL	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRSZ	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PDSO28, PLASTIC, MO-150AH, SSOP-28
AD1895AYRSZ	ADI	获取价格	192 kHZ Stereo Asynchronous Sample Rate Converter
AD1895AYRSZRL	ADI	获取价格	192 kHZ Stereo Asynchronous Sample Rate Converter
AD1895JRS	ADI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO28, SSOP-28, Consumer IC:Other
AD1895YRS	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895YRSRL	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1896	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1896AYRS	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1896AYRSRL	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter

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