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CS8421-CZZ Datasheet(PDF) 9 Page - Cirrus Logic |
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CS8421-CZZ Datasheet(HTML) 9 Page - Cirrus Logic |
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9 / 36 page  DS641F4 9 CS8421 Pin Name # Pin Description VD 1 Digital Power (Input) - Digital core power supply. Typically +2.5 V. GND 2 Ground (Input) - Ground for I/O and core logic. RST 3 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 untilthe power supply is stable and all input clocks are stable in frequency and phase. BYPASS 4 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. ILRCK 5 Serial Audio Input Left/Right Clock (Input/Output) - Word-rate clock for the audio data on the SDIN pin. ISCLK 6 Serial Audio Bit Clock (Input/Output) - Serial-bit clock for audio data on the SDIN pin. SDIN 7 Serial Audio Input Data Port (Input) - Audio data serial input pin. MCLK_OUT 8 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 21. TDM_IN 9 Serial Audio TDM Input (Input) - Time Division Multiplexing serial audio data input. Grounded when not used. See “Time Division Multiplexing (TDM) Mode” on page 22. SDOUT 10 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. OSCLK 11 Serial Audio Bit Clock (Input/Output) - Serial bit clock for audio data on the SDOUT pin. OLRCK 12 Serial Audio Input Left/Right Clock (Input/Output) - Word rate clock for the audio data on the SDOUT pin. MS_SEL 13 Master/Slave Select (Input) - Used to select Master or Slave for the input and output serial audio ports at startup and reset. See Table 1 on page 19 for settings. GND 14 Ground (Input) - Ground for I/O and core logic. VL 15 Logic Power (Input) - Input/Output power supply. Typically +3.3 V or +5.0 V. SAOF 16 Serial Audio Output Format Select (Input) - Used to select the serial audio output format at star- tup and reset. See Table 3 on page 19 for format settings. SAIF 17 Serial Audio Input Format Select (Input) - Used to select the serial audio input format at startup and reset. See Table 2 on page 19 for format settings. SRC_UNLOCK 18 SRC Unlock Indicator (Output) - Indicates when the SRC is unlocked. See “SRC Locking and Varispeed” on page 20. XTO 19 Crystal Out (Output) - Crystal output for Master clock. See “Master Clock” on page 21. XTI 20 Crystal/Oscillator In (Input) - Crystal or digital clock input for Master clock. See “Master Clock” on page 21. Thermal Pad - Thermal Pad - Thermal relief pad for optimized heat dissipation. This pad must be electrically con- nected to GND. See “Power Supply, Grounding, and PCB Layout” on page 24 for more information. |
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