CS43L21 datasheet(7/63 Pages) CIRRUS

7 / 63 page

DS723A1

CS43L21

AOUTB

AOUTA

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

tics specification table

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

AGND

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

FILT+

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

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

NIC

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.

TSTO

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).

TSTO

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).

TSTO

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).

TSTO

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).

TSTO

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).

TSTO

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).

RESET

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

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.

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

DGND

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

TSTO

(M/S)

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).

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

Slave Mode for the serial port.

MCLK

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

SCLK

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

SDIN

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

Thermal Pad

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

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