Audio Dpwm Modulator (Dpwm); Overview; Features; Block Diagram - Nuvoton ISD94124BYI Technical Reference Manual

6.21 Audio DPWM Modulator (DPWM)

6.21.1 Overview

The DPWM modulator is sigma-delta modulator which is for class D amplifer. ISD94100 series has
3 DPWM modulator and each one can provide 2 differential pins.

6.21.2 Features


Differential Audio PWM Output (DPWM)

Support left channel,right channel and sub-woofer channel.

Support sample rates from 16~96kHz.

Programeable biquad filter with 10 band

PDMA data channel for streaming of PCM audio data.

Support the single precision floating point for input data and BIQ coefficient
Provides one 32-level FIFO data buffers for transmitting.


6.21.3 Block Diagram

2.0 2.0
AFIFO FltToFix
APB

6.21.4 Basic Configuration


Clock source configuration
–
The source of DPWM peripheral clock is selected by DPWMSEL
(CLK_CLKSEL2[13:12]).
–
The DPWM peripheral clock is enabled by DPWMCKEN (CLK_APBCLK1[6]).

Reset configuration
–
The DPWM module is reset by DPWMRST (SYS_IPRST2[6]).

Pin configuration
Group Pin Name
DPWM DPWM_LN
Sep 9, 2019
ISD94100 Series Technical Reference Manual
Programmable Coefficient
Programmable Coefficient
Spliter
BIQ 4band
2.0 2.0
BIQ
6band

Figure 6.21-1 DPWM Block Diagram

GPIO
PA.4
PC.12
Page 897 of 928
2.1
2.0 2.0/2.1
DPWM
SEL
Modulator
2.0
DPWM_LP/DPWM_LN pin
DPWM_RP/DPWM_RN pin
DPWM_SP/DPWM_SN pin
MFP
MFP3
MFP3
Rev1.09