FEATURES

SAMPLING RATIO

16:1 to 1:16

RATES UP TO 212kHz

FILTERING WITH BETTER THAN 140dB OF

STOP BAND ATTENUATION

− Master or Slave Mode Operation

and TDM Data Formats

− TDM Mode Allows Daisy-Chaining of Up to

Four Devices

OUTPUT DATA:

− All Output Data is Dithered from the Internal

28-Bit Data Path

SUPPORTS REGISTER READ AND WRITE

OPERATIONS IN SOFTWARE MODE

− Routes Input Port Data Directly to the Output

Port

INTERPOLATION FILTER

DECIMATION FILTER

− User-Selectable for 32kHz, 44.1kHz, and

48kHz Sampling Rates

ATTENUATION (SOFTWARE MODE ONLY):

− 256 Steps: 0dB to −127.5dB with 0.5dB Steps

READBACK (SOFTWARE MODE ONLY)

OR +3.3V POWER SUPPLY

APPLICATIONS

DESCRIPTION

The SRC4194 is a four-channel, asynchronous sample

rate converter (ASRC), designed for professional and

broadcast audio applications. The SRC4194 combines a

wide input-to-output sampling ratio with outstanding

dynamic range and ultra low distortion. The input and

output serial ports support the most common audio data

formats, as well as a time division multiplexed (TDM)

format. This allows the SRC4194 to interface to a wide

range of audio data converters, digital audio receivers and

transmitters, and digital signal processors.

The SRC4194 may be operated in Hardware mode as a

standalone pin-programmed device, with dedicated

control pins for serial port mode, audio data format, soft

mute, bypass, and digital filtering functions. Alternatively,

the SRC4194 may be operated in Software mode, where

a four-wire serial peripheral interface (SPI) port provides

access to internal control and status registers.

The SRC4194 operates from either a +1.8V core supply or

a +3.3V core supply. When operating from +3.3V, the

+1.8V required by the core logic is derived from an internal

voltage regulator. The SRC4194 also requires a digital I/O

supply, which operates from +1.65V to +3.6V. The

SRC4194 is available in a TQFP-64 package.

U.S. Patent No. 7,262,716.

SRC4194

SBFS025B − JUNE 2004 − REVISED SEPTEMBER 2007

4-Channel, Asynchronous Sample Rate Converter

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

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 2004−2007, Texas Instruments Incorporated

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