CS8421-CZZR Cirrus Logic Inc, CS8421-CZZR Datasheet - Page 7

• Manufacturer Part Number: CS8421-CZZR
• Description: IC,Digital Audio Sample Rate Converter,CMOS,TSSOP,20PIN
• Manufacturer: Cirrus Logic Inc

DS641F1
SRC_UNLOCK
MCLK_OUT
Pin Name
BYPASS
MS_SEL
TDM_IN
SDOUT
OLRCK
OSCLK
ILRCK
ISCLK
SAOF
SDIN
GND
GND
SAIF
XTO
RST
XTI
VD
VL
10
12
13
14
15
16
17
18
19
20
11
#
1
2
3
4
5
6
7
8
9
Crystal Out (Output) - Crystal output for Master clock. See
Crystal/Oscillator In (Input) - Crystal or digital clock input for Master clock. See
on page
Digital Power (Input) - Digital core power supply. Typically +2.5 V.
Ground (Input) - Ground for I/O and core logic.
Reset (Input) - When RST is low, the CS8421 enters a low-power mode and all internal states are
reset. On initial power-up, RST must be held low until the power supply is stable and all input
clocks are stable in frequency and phase.
Sample Rate Converter Bypass (Input) - When BYPASS is high, the sample rate converter will
be bypassed, and any data input through the serial audio input port will be directly output on the
serial audio output port. When BYPASS is low, the sample rate converter will operate normally.
Serial Audio Input Left/Right Clock (Input/Output) - Word-rate clock for the audio data on the
SDIN pin.
Serial Audio Bit Clock (Input/Output) - Serial-bit clock for audio data on the SDIN pin.
Serial Audio Input Data Port (Input) - Audio data serial input pin.
Master Clock Output (Output) - Buffered and level-shifted output for Master clock. If MCLK_OUT
is not required, this pin should be pulled high through a 47 kΩ resistor to turn the output off. See
“Master Clock” on page
Serial Audio TDM Input (Input) - Time Division Multiplexing serial audio data input. Grounded
when not used. See
Serial Audio Output Data Port (Output) - Audio data serial output pin. Optionally this pin may be
pulled low through a 47 kΩ resistor, but should not be pulled high.
Serial Audio Bit Clock (Input/Output) - Serial-bit clock for audio data on the SDOUT pin.
Serial Audio Input Left/Right Clock (Input/Output) - Word-rate clock for the audio data on the
SDOUT pin.
Master/Slave Select (Input) - Used to select Master or Slave for the input and output serial audio
ports at startup and reset. See
Ground (Input) - Ground for I/O and core logic.
Logic Power (Input) - Input/Output power supply. Typically +3.3 V or +5.0 V.
Serial Audio Output Format Select (Input) - Used to select the serial audio output format at star-
tup and reset. See
Serial Audio Input Format Select (Input) - Used to select the serial audio input format at startup
and reset. See
SRC Unlock Indicator (Output) - Indicates when the SRC is unlocked. See
Varispeed” on page
21.
Table 2 on page 19
Table 3 on page 19
20.
“Time Division Multiplexing (TDM) Mode” on page
21.
Table 1 on page 19
for format settings.
for format settings.
Pin Description
for settings.
“Master Clock” on page
23.
“SRC Locking and
“Master Clock”
21.
CS8421
7