FEATURES

AUTOMATIC SENSING OF INPUT-TO-OUTPUT

SAMPLING RATIO

WIDE INPUT-TO-OUTPUT SAMPLING RANGE:

16:1 to 1:16

SUPPORTS INPUT AND OUTPUT SAMPLING

RATES UP TO 212kHz

DYNAMIC RANGE: 144dB (−60dbFS Input,

BW = 20Hz to fs/2)

THD+N: −140dB (0dbFS Input, BW = 20Hz to fs/2)

HIGH-PERFORMANCE, LINEAR-PHASE DIGITAL

FILTERING WITH BETTER THAN 140dB OF

STOP BAND ATTENUATION

FLEXIBLE AUDIO SERIAL PORTS:

− Master or Slave Mode Operation

− Supports I2S, Left-Justified, Right-Justified,

and TDM Data Formats

− TDM Mode Allows Daisy-Chaining of Up to

Four Devices

SUPPORTS 24-, 20-, 18-, or 16-BIT INPUT AND

OUTPUT DATA:

− All Output Data is Dithered from the Internal

28-Bit Data Path

SERIAL PERIPHERAL INTERFACE (SPI) PORT

SUPPORTS REGISTER READ AND WRITE

OPERATIONS IN SOFTWARE MODE

BYPASS MODE:

− Routes Input Port Data Directly to the Output

Port

FOUR GROUP DELAY OPTIONS FOR THE

INTERPOLATION FILTER

DIRECT DOWNSAMPLING OPTION FOR THE

DECIMATION FILTER

DIGITAL DE-EMPHASIS FILTER:

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

48kHz Sampling Rates

SOFT MUTE FUNCTION

PROGRAMMABLE DIGITAL OUTPUT

ATTENUATION (SOFTWARE MODE ONLY):

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

INPUT-TO-OUTPUT SAMPLING RATIO

READBACK (SOFTWARE MODE ONLY)

POWER-DOWN MODES

SUPPORTS OPERATION FROM A SINGLE +1.8V

OR +3.3V POWER SUPPLY

AVAILABLE IN A TQFP-64 PACKAGE

APPLICATIONS

DIGITAL MIXING CONSOLES

DIGITAL AUDIO WORKSTATIONS

AUDIO DISTRIBUTION SYSTEMS

BROADCAST STUDIO EQUIPMENT

GENERAL DIGITAL AUDIO PROCESSING

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.