CS43L21 查看數據表（PDF） - Cirrus Logic

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CS43L21

Low Power, Stereo Digital to Analog Converter

Cirrus Logic 

CS43L21

AOUTB

AOUTA

VA

AGND

FILT+

VQ

NIC

TSTO

TSTO

TSTO

TSTO

TSTO

TSTO

RESET

VL

VD

DGND

TSTO

(M/S)

MCLK

SCLK

SDIN

Thermal Pad

10 Analog Audio Output (Output) - The full-scale output level is specified in the DAC Analog Characteris-

11 tics specification table

12 Analog Power (Input) - Positive power for the internal analog section.

13 Analog Ground (Input) - Ground reference for the internal analog section.

14 Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.

15 Quiescent Voltage (Output) - Filter connection for internal quiescent voltage.

16 Not Internally Connected - This pin is not connected internal to the device and may be connected to

ground or left “floating”. No other external connection should be made to this pin.

17 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

nection external to the pin).

18 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

nection external to the pin).

19 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

nection external to the pin).

20 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

nection external to the pin).

21 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

22 nection external to the pin).

23 Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

24 nection external to the pin).

25 Reset (Input) - The device enters a low power mode when this pin is driven low.

26 Digital Interface Power (Input) - Determines the required signal level for the serial audio interface and

host control port. Refer to the Recommended Operating Conditions for appropriate voltages.

27 Digital Power (Input) - Positive power for the internal digital section.

28 Digital Ground (Input) - Ground reference for the internal digital section.

Test Out (Output) - This pin is an output used for test purposes only and must be left “floating” (no con-

nection external to the pin).

29

Serial Port Master/Slave (Input/Output) - Hardware Mode Startup Option: Selects between Master and

Slave Mode for the serial port.

30 Master Clock (Input) - Clock source for the delta-sigma modulators.

31 Serial Clock (Input/Output) - Serial clock for the serial audio interface.

32 Serial Audio Data Input (Input) - Input for two’s complement serial audio data.

- Thermal relief pad for optimized heat dissipation. See “QFN Thermal Pad” on page 59.

DS723A1

7

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