CS4525 datasheet(9/98 Pages) CIRRUS

9 / 98 page

DS726PP1

CS4525

LVD

VD Voltage Level Indicator (Input) - Identifies the voltage level attached to VD. When applying

5.0 V to VD, LVD must be connected to VD. When applying 2.5 V or 3.3 V to VD, LVD must be

DGND.

DGND

Digital Ground (Input) - Ground for the internal logic and digital I/O.

VD_REG

Core Logic Power (Output) - Internally generated low voltage power supply for digital logic.

Power (Input) - Positive power supply for the internal regulators and digital I/O.

VA_REG

Analog Power (Output) - Internally generated positive power for the analog section and I/O.

AGND

Analog Ground (Input) - Ground reference for the internal analog section and I/O.

FILT+

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

circuits.

Common Mode Voltage (Output) - Filter connection for internal common mode voltage.

AFILTL

AFILTR

Antialias Filter Connection (Output) - Antialias filter connection for ADC inputs.

AINL

AINR

Analog Input (Input) - The full-scale input level is specified in the ADC Analog Characteristics

specification table.

OCREF

Over Current Reference Setting (Input) - Sets the reference for over current detection.

PGND

22,23

27,28

33,34

37,38

Power Ground (Input) - Ground for the individual output power half-bridge devices.

RAMP_CAP

Output Ramp Capacitor (Input) - Used by the PWM Popguard Transient Control to suppress the

initial pop in half-bridge-configured outputs.

25,30,

31,36

High Voltage Power (Input) - High voltage power supply for the individual half-bridge devices.

OUT4

OUT3

OUT2

OUT1

PWM Output (Output) - Amplified PWM power outputs.

PWM_SIG2

PWM_SIG1

Logic Level PWM Output (Output) - Logic Level PWM switching signals.

DLY_SDOUT

Delay Serial Audio Data Out (Output) - Output for two’s complement serial audio data.

DLY_SDIN/

EX_TWR

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

External Thermal Warning (Input) - Input for an external thermal warning signal. Configurable via

the I²C control port.

AUX_SDOUT

Auxiliary Port Serial Audio Data Out (Output) - Output for two’s complement auxiliary port serial

data.

AUX_SCLK

Auxiliary Port Serial Clock (Output) - Serial clock for the auxiliary port serial interface.

AUX_LRCK/

AD0

Auxiliary Port Left Right Clock (Output) - Determines which channel, Left or Right, is currently

active on the serial audio data line.

AD0 (Input) - Sets the LSB of the I²C device address. Sensed on the release of RST.

SYS_CLK

System Clock (Input/Output) -Clock source for the internal logic, processing, and modulators. This

pin should be connected to through a 10k

Ω to ground when unused.

XTO

Crystal Oscillator Output (Output) - Crystal oscillator driver output.

XTI

Crystal Oscillator Input (Input) - Crystal oscillator driver input.

Thermal Pad

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

page 65 for more information.

CS4525 Datasheet(PDF) 9 Page - Cirrus Logic

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