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SRC4190-Q1 Datasheet(PDF) 22 Page - Texas Instruments

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Part No. SRC4190-Q1
Description  192-kHz STEREO ASYNCHRONOUS SAMPLE-RATE CONVERTER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

SRC4190-Q1 Datasheet(HTML) 22 Page - Texas Instruments

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SRC4190-Q1
SBFS034A – SEPTEMBER 2008 – REVISED OCTOBER 2009
www.ti.com
Table 3 illustrates data format selection for the output port. The OFMT0 (pin 19), OFMT1 (pin 18), OWL0 (pin
17), and OWL1 (pin 16) inputs are utilized to set the output port data format and word length.
Table 3. Output Port Data Format Selection
OFMT1
OFMT0
OUTPUT PORT DATA FORMAT
0
0
Left justified
0
1
I2S
1
0
TDM
1
1
Right justified
OWL1
OWL0
OUTPUT PORT DATA WORD LENGTH
0
0
24 bits
0
1
20 bits
1
0
18 bits
1
1
16 bits
Bypass Mode
The SRC4190 includes a bypass function, which routes the input port data directly to the output port, bypassing
the ASRC function. Bypass mode may be invoked by forcing the BYPAS input (pin 9) high. For normal ASRC
operation, the BYPAS pin should be set to 0.
No dithering is applied to the output data in bypass mode; digital attenuation and mute functions are also
unavailable in this mode.
Soft Mute Function
The soft mute function of the SRC4190 may be invoked by forcing the MUTE input (pin 14) high. The Soft mute
function slowly attenuates the output signal level down to all zeroes plus ±4 LSB of dither. This provides an
artifact-free muting of the audio output port.
Ready Output
The SRC4190 includes an active-low ready output named RDY (pin 15). This is an output from the rate estimator
block, which indicates that the input-to-output sampling frequency ratio has been determined. The ready signal
can be used as a flag or indicator output. The ready signal can also be connected to the active-high MUTE input
(pin 14) to provide an auto-mute function, so that the output port is muted when the rate estimator is in transition.
22
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): SRC4190-Q1


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