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.