DIR9001 Datasheet, PDF (10/30 Pages) Texas Instruments – 96-kHz, 24-Bit Digital Audio Interface Receiver

DIR9001
SLES198 – DECEMBER 2006
OPERATION MODE AND CLOCK TRANSITION SIGNAL OUT
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Operation Mode
The DIR9001 has the following three operation modes.
These modes are selected by the connection of the CKSEL pin.
• PLL MODE: For demodulating a biphase input signal; always outputs PLL source clock
• XTI MODE: For clock generator; always outputs XTI source clock
• AUTO MODE: Automatic clock source selection; output source depends on ERROR pin.
Notes about operation mode selection:
• Normally, the PLL mode: CKSEL = L is selected to decode a biphase input signal.
• The XTI mode is a mode that supplies the XTI source clock to peripheral devices (A/D converters, etc);
therefore, recovered clock and decoded data is not output.
• When the XTI source is not used, an XTI source is not required. In this case, clocks are not output in the XTI
mode.
• At the time of XTI mode selection, biphase decode function continues to operate. Therefore, the biphase
input status (ERROR) and the result of the sampling frequency calculator (a required XTI source for
operation), are always monitored. That is, the following output pins: ERROR, BFRAME, FSOUT[1:0], CLKST,
AUDIO and EMPH are always enabled.
The details of these three modes are given in Table 2.
Table 2. Operation Mode and Clock Source
OPERATION
MODE
PLL
XTI
AUTO
CKSEL PIN
SETTING
L
H
Connected to
ERROR pin
ERROR
PIN
STATUS
H
L
H
L
H
L
SCKO, BCKO, LRCKO
CLOCK SOURCE
PLL (VCO) free-running
clock ⁽¹⁾
PLL recovered clock
XTI clock
XTI clock
XTI clock
PLL recovered clock
DOUT DATA AUDIO FSOUT BFRAME
EMPH [1:0]
COUT
UOUT
MUTE (Low) LOW
HL
LOW
LOW
Decoded data
MUTE (Low)
MUTE (Low)
MUTE (Low)
Decoded data
OUT
LOW
OUT
LOW
OUT
OUT
HL
OUT
HL
OUT
OUT
LOW
OUT
LOW
OUT
OUT
LOW
LOW
LOW
OUT
(1) The VCO free-running frequency is not a constant frequency, because the VCO oscillation frequency is dependent on supply voltage,
temperature, and process variations.
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