CS8421-CNZ Cirrus Logic Inc, CS8421-CNZ Datasheet - Page 23

• Manufacturer Part Number: CS8421-CNZ
• Description: IC SAMPLE RATE CONVERTER 20QFN
• Manufacturer: Cirrus Logic Inc
• Type: Sample Rate Converterr

Specifications of CS8421-CNZ

• Package / Case: 20-QFN
• Applications: Digital Audio
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3.3 V / 5.0 V
• Operating Temperature Range: - 10 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1018 - BOARD EVAL FOR CS8421
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1730

DS641F5
4.5
SDOUT/
TDM_IN
OLRCK
OSCLK
Source
OLRCK
Output
OLRCK
Clock
PCM Source 1
PCM Source 1
OSCLK
OSCLK
Reset, Power-Down, and Start-Up
When RST is low, the CS8421 enters a low-power mode, all internal states are reset, and the outputs are
disabled. After RST transitions from low to high, the part senses the resistor value on the configuration pins
(MS_SEL, SAIF, and SAOF) and sets the appropriate mode of operation. After the mode has been set (ap-
proximately 4  s), the part is set to normal operation and all outputs are functional.
LRCK
SCLK
SDOUT
SDOUT
TDM_IN
ILRCK
ISCLK
SDIN
TDM_IN
ILRCK
ISCLK
SDIN
Figure 14. TDM Mode Configuration (First CS8421 Output is Master, All Others are Slave)
CS8421
MSB
CS8421
SDOUT 4, ch A
Master
Slave
32 clks
OLRCK
SDOUT
OSCLK
SDOUT
OLRCK
OSCLK
1
1
LSB
Figure 13. TDM Mode Configuration (All CS8421 Outputs are Slave)
OLRCK
OLRCK
PCM Source 2
PCM Source 2
MSB
SDOUT 4, ch B
OSCLK
OSCLK
32 clks
SDOUT
SDOUT
Figure 12. TDM Master Mode Timing Diagram
LSB
TDM_IN
ILRCK
ISCLK
SDIN
TDM_IN
ILRCK
ISCLK
SDIN
CS8421
CS8421
MSB
Slave
SDOUT 3, ch A
Slave
32 clks
SDOUT
OLRCK
OSCLK
2
SDOUT
OLRCK
OSCLK
2
OLRCK
LSB
OLRCK
PCM Source 3
PCM Source 3
OSCLK
MSB
OSCLK
SDOUT 3, ch B
256 OSCLKs
32 clks
SDOUT
SDOUT
TDM_IN
ILRCK
ISCLK
SDIN
TDM_IN
ILRCK
ISCLK
SDIN
LSB
CS8421
CS8421
Slave
MSB
Slave
SDOUT 2, ch A
OLRCK
SDOUT
OSCLK
32 clks
3
SDOUT
OLRCK
OSCLK
3
OLRCK
PCM Source 4
OLRCK
LSB
PCM Source 4
OSCLK
MSB
OSCLK
SDOUT 2, ch B
SDOUT
32 clks
SDOUT
TDM_IN
ILRCK
ISCLK
SDIN
TDM_IN
ILRCK
ISCLK
SDIN
CS8421
LSB
CS8421
Slave
Slave
MSB
SDOUT
SDOUT 1, ch A
OLRCK
OSCLK
4
SDOUT
32 clks
OLRCK
OSCLK
4
LSB
MSB
CS8421
SDOUT 1, ch B
32 clks
LRCK
SCLK
SDIN
LRCK
SCLK
SDIN
DSP
Slave
DSP
Slave
LSB
23