2 stand-alone mode, Cs4270 – Cirrus Logic CS4270 User Manual
Page 5
DS686F1
5
CS4270
1.2
Stand-Alone Mode
Pin Name
#
Pin Description
SDIN
1
Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
LRCK
2
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serialaudio data line. The frequency of the left/right clock must be at the audio sample rate, Fs.
MCLK
3
Master Clock (Input) - Clock source for the delta-sigma modulator and digital filters.
SCLK
4
Serial Bit Clock (Input/Output) - Serial bit clock for the serial audio interface.
VD
5
Digital Power (Input) - Positive power for the digital section.
DGND
6
Digital Ground (Input) - Ground reference for the digital section.
SDOUT
(M/S)
7
Serial Audio Data Output (Output) - Output for two’s complement serial audio data. This pin must be
pulled up or down through a 47-k
resistor to select Master or Slave Mode.
VLC
8
Serial Control Port Power (Input) - Positive power for the Serial Control Port.
M1
M0
9
10
Mode Selection (Input) - Determines the system sampling frequency range of the device.
I²S/LJ
11
Serial Audio Interface Select (Input) - Selects either the Left-Justified or
I²S
format for the Serial Audio
Interface.
MDIV1
MDIV2
12
13
MCLK Divide (Input) - Configures the device to divide MCLK by 1, 1.5, 2, or 4.
RST
14
Reset (Input) - Input for resetting all internal registers to their default settings and for placing the device
in a low-power mode.
AINA
AINB
15
16
Analog Input (Input) - Analog inputs to the ADC.
VQ
17
Quiescent Voltage (Output) - Filter connection for the internal quiescent voltage
FILT+
18
Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
VA
19
Analog Power (Input) - Positive power for the analog section.
AGND
20
Analog Ground (Input) - Ground reference for the analog section.
MUTEA
MUTEB
21
24
Mute Control (Output) - Mute control signal used to control the state of the optional external analog mut-
ing circuitry. See
AOUTA
AOUTB
22
23
Analog Audio Output (Output) - Analog outputs for the DAC.
1
2
3
4
5
6
7
8
21
22
23
24
9
10
11
12
17
18
19
20
13
14
15
16
SDIN
LRCK
MCLK
SCLK
VD
DGND
SDOUT
VLC
M1
M0
I²S/LJ
MDIV1
MUTEB
AOUTB
AOUTA
MUTEA
AGND
VA
FILT+
VQ
AINB
AINA
RST
MDIV2