CS8427-CSZ datasheet(39/59 Pages) CIRRUS

39 / 59 page

CS8427

DS477F3

12. PIN DESCRIPTION - SOFTWARE MODE

SDA/CDOUT

AD0/CS

EMPH

RXP

RXN

VA+

AGND

FILT

RST

RMCK

RERR

ILRCK

ISCLK

SDIN

*26

*25

*24

*23

*22

*18

*17

*16

*15

10*

11*

12*

13*

14*

SCL/CCLK

AD1/CDIN

TXP

TXN

H/S

V+

DGND

OMCK

INT

SDOUT

OLRCK

OSCLK

TCBL

* Pins which remain the same function in all modes.

+ Pins which require a pull up or pull down resistor

to select the desired startup option.

SDA/CDOUT

Serial Control Data I/O (I²C) / Data Out (SPI) (Input/Output) - In I²C mode, SDA is the con-

trol I/O data line. SDA is open drain and requires an external pull-up resistor to VL+. In SPI

mode, CDOUT is the output data from the control port interface on the CS8427

AD0/CS

Address Bit 0 (I²C) / Control Port Chip Select (SPI) (Input) - A falling edge on this pin puts

the CS8427 into SPI control port mode. With no falling edge, the CS8427 defaults to I²C

mode. In I²C mode, AD0 is a chip address pin. In SPI mode, CS is used to enable the control

port interface on the CS8427

EMPH

Pre-Emphasis (Output) - EMPH is low when the incoming Channel Status data indicates

50/15 ms pre-emphasis. EMPH is high when the Channel Status data indicates no pre-

emphasis or indicates pre-emphasis other than 50/15 ms. This is also a start-up option pin,

and requires a 47 k

Ω resistor to either VL+ or DGND, which determines the AD2 address bit

for the control port in I²C mode

RXP

RXN

Differential Line Receiver (Input) - Receives differential AES3 data.

VA+

Positive Analog Power (Input) - Positive supply for the chip’s analog section. Nominally

+5.0 V. This supply should be as quiet as possible since noise on this pin will directly affect

the jitter performance of the recovered clock

AGND

Analog Ground (Input) - Ground for the analog section. AGND should be connected to the

same ground as DGND

FILT

PLL Loop Filter (Output) - An RC network should be connected between this pin and

ground. See “Appendix C: PLL Filter” on page 54 for recommended schematic and compo-

nent values.

RST

Reset (Input) - When RST is low, the CS8427 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. This is particularly true in hardware

mode with multiple CS8427 devices where synchronization between devices is important

RMCK

Input Section Recovered Master Clock (Input/Output) - Input section recovered master

clock output when PLL is used. Frequency defaults to 256x the sample rate (Fs) and may be

set to 128x. When the PLL is bypassed by the RXD[1:0] bits in the Clock Source Control reg-

ister, an external clock of 256 Fs may be applied to this pin

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