CS4220 CS4221

DS284PP3

21

SDIN

9

Serial Data Input (

Input) - Two’s complement MSB-first serial data is input on this pin. The

required relationship between the left/right clock, serial clock and serial data is defined by the

DSP Port Mode (05h) register. The options are detailed in Figures 8 - 11.

SCL/CCLK

10

Serial Control Port Clock (

Input) - Clocks the serial control bits into and out of the CS4221.

SDA/CDIN

11

Serial Control Port Data (

serial control port in SPI mode.

AD0/CS

12

Address Bit/Control Chip Select (

mode, CS is used to enable the control port interface on the CS4221. The CS4221 control port

interface is defined by the SPI/I2C pin.

VL

13

Logic Power (

Input) - Positive power supply for the digital interface section. Typically 3.0 to

5.0 VDC.

AINR-, AINR+

16,17

Differential Right Channel Analog Input (

Input) - The full scale analog input level (differen-

tial) is specified in the Analog Characteristics specification table and may be AC coupled or DC

coupled into the device, see Figure 12 for optional line input buffer.

I2C/SPI

18

Control Port Format (

selected.

AINL-, AINL+

19,20

Differential Left Channel Analog Input (

Input) - The full scale analog input level (differential)

is specified in the Analog Characteristics specification table and may be AC coupled or DC

coupled into the device, see Figure 12 for optional line input buffer.

VA

21

Analog Power (

Input) - Positive power supply for the analog section. Typically 5.0 VDC.

AGND

22

Analog Ground (

Input) - Analog ground reference.

AOUTR-,

AOUTR+

23, 24

Differential Right Channel Analog Outputs (

Output) - The full scale analog output level (dif-

ferential) is specified in the Analog Characteristics specification table.

AOUTL-,

AOUTL+

25, 26

Differential Left Channel Analog Outputs (

Output) - The full scale analog output level (dif-

ferential) is specified in the Analog Characteristics specification table.

RST

27

Reset (

Input) - When low, the device enters a low power mode and all internal registers are

reset, including the control port. When high, the control port becomes operational and normal

operation will occur.