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 performance 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.

FEATURES

Automatically Senses Sample Frequencies

No Programming Required

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

Linear Phase FIR Filter

Hardware Controllable Soft Mute

Supports 256 x fS, 512 x fS, or 768 x fS Master Mode Clock

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

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

Serial Port Modes

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