UDA1341TS/N1 Просмотр технического описания (PDF) - Philips Electronics

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UDA1341TS/N1

Economy audio CODEC for MiniDisc (MD) home stereo and portable applications

Philips Electronics 

Philips Semiconductors

Economy audio CODEC for MiniDisc (MD)

home stereo and portable applications

Preliminary specification

UDA1341TS

7.21 Programming the sound processing and other

features

The sound processing and other feature values are stored

in independent registers.

The first selection of the registers is achieved by the choice

of data type that is transferred. This is performed in the

address mode using bit 0 and bit 1 (see Table 4).

The second selection is performed by the 2 or 3 MSBs of

the data byte (bits 7 and 6 or bits 7, 6 and 5).

The other bits in the data byte (bits 5 to 0 or bits 4 to 0)

represent the value that is placed in the selected registers.

For the UDA1341TS the following modes can be selected:

• STATUS

In this mode the features reset, system clock frequency,

data input format, DC-filter, input gain switch, output

gain switch, polarity control, double speed and power

control can be controlled.

• DATA0

There are two addressing modes: direct addressing

mode and extended addressing mode.

Direct addressing mode is using the 2 MSB bits of the

data byte. Via this addressing mode the features

volume, bass boost, treble, peak position, de-emphasis,

mute, and mode can be controlled directly.

Extended addressing mode is provided for controlling

the features digital mixer, AGC control, MIC sensitivity,

input gain, AGC time constants, and AGC output level.

An extended address can be set via the EA registers

(3 bits). The data in the extended registers can be set by

writing data to the ED registers (5 bits).

• DATA1

In this mode the detected peak level value can be read

out.

Table 5 Default settings

SYMBOL

FEATURE

Status

OGS

IGS

PAD

PDA

DS

PC

Output gain switch

Input gain switch

Polarity of ADC

Polarity of DAC

Double speed

Power control ADC and DAC

Direct control

VC

Volume control

BB

Bass boost

TR

Treble

PP

Peak detection position

DE

De-emphasis

MT

Mute

M

Mode switch

Extended programming

MA

Mixer gain channel 1

MB

Mixer gain channel 2

MS

MIC sensitivity

MM

Mixer mode switch

AG

AGC control

AT

AGC attack and decay time

AL

AGC output level

SETTING OR VALUE

0 dB

0 dB

non-inverting

non-inverting

single speed

on

0 dB

0 dB

0 dB

after the tone features

no de-emphasis

no mute

flat

−6 dB

−6 dB

0 dB

double differential

disable AGC

11 ms and100 ns

−9 dB FS

1998 Dec 18

13

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