V R

IN

13

14

V

COM

4.7 F

m

30 kW

+

+

–

–

Delta-Sigma

Modulator

(+)

(–)

Reference

(V

/2)

CCC

10 F

m

+

SSPND

S/PDIF Decoder

DIN

Lock

ADC

V L

IN

V R

IN

V

COM

FIFO

Selector

Analog

PLL

Analog

PLL

FIFO

DAC

V

L

OUT

V

R

OUT

S/PDIF Encoder

DOUT

XTI

XTO

12 MHz

PLL ( 8)

×

96 MHz

Tracker

(SpAct)

USB

Protocol

Controller

Power

Manager

ISO-In

End-Point

Control

End-Point

ISO-Out

End-Point

HID

End-Point

D+

D-

SEL0

SEL1

HID0

HID1

HID2

V

BUS

V

CCC

V

CCP1

V

CCP2

V

CCX

V

DD

DGNDU

DGND

AGNDX

AGNDP

AGNDC

PCM2903C

SBFS038A – JUNE 2012 – REVISED SEPTEMBER 2015

www.ti.com

9 Detailed Description

9.1 Overview

The PCM2903C is an audio codec with USB connection capability and a digital S/PDIF digital interface. The

PCM2903C is a self-powered device; it needs an external 3.3V voltage source. The PCM2903C meet the

requirements of USB1.1 standard connection. This device has analog and digital inputs and outputs; it has a

digital S/PDIF interface for input and output data. The PCM2903C has 3 external interrupts (HID) which control

the Mute, Volume Up and Volume Down, these control inputs are active High. The PCM2903C requires a 12MHz

clock; it can be provided by an external clock or generated by a built-in crystal resonator.

9.2 Functional Block Diagram

Figure 34. Block Diagram of Analog Front-End (Right Channel)

16

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