TCM320AC46

GENERALPURPOSE AUDIO INTERFACE FOR DSP

SLWS001 − D4091, JUNE 1993

POST OFFICE BOX 655303

POST OFFICE BOX 1443

2

description (continued)

The receive section takes a frame of serial data on DIN and converts it to analog through an expanding

digital-to-analog converter (EXDAC) if the companded mode is selected; otherwise, a linear conversion is

performed. The analog signal then passes through switched-capacitor filters, which provide out-of-band

rejection, (sin x)/x correction functions, and smoothing. The filtered signal is sent to the earphone amplifier. The

earphone amplifier has a differential output with adjustable gain that is designed to minimize static power

dissipation.

A single on-chip, high-precision band-gap circuit generates all voltage references, eliminating the need for

external reference voltages.

The TCM320AC46 device is characterized for operation from 0

°C to 70°C.

functional block diagram

12

13

8

DIN

FSR

7

14

15

LINSEL

1

PDN

16

GND

5

VCC

10

4

3

2

EARMUTE

EARGS

EARB

EARA

Amplifier

Earphone

256 kHz

Reference

Voltage

Converter

D/A

Reference

Voltage

Converter

A/D

Reference

Voltage

Band-Gap

8 kHz

256 kHz

Generator

Clock

Autozero

DCLKR

CLK

TSX/DCLKX

Control

Clock

FSX

DOUT

Logic

Output

ADC

High Pass

First-Order

Transmit

Low Pass

Sixth-Order

Transmit

MICGS

20

17

19

18

6

VMID

MICBIAS

VMID

Generator

VMID

MICIN

MICMUTE

Buffer

Input

Antialias

Third-Order

Transmit

Buffer

Receive

Filter

Receive

DAC

Logic

Input

256 kHz

8 kHz

9

LINSEL

15

11