UDA1341TS datasheet(13/32 Pages) PHILIPS

13 / 32 page

1998 Dec 18

Philips Semiconductors

Preliminary speciﬁcation

Economy audio CODEC for MiniDisc (MD)

home stereo and portable applications

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

SETTING OR VALUE

Status

OGS

Output gain switch

0 dB

IGS

Input gain switch

0 dB

PAD

Polarity of ADC

non-inverting

PDA

Polarity of DAC

non-inverting

Double speed

single speed

Power control ADC and DAC

Direct control

Volume control

0 dB

Bass boost

0 dB

Treble

0 dB

Peak detection position

after the tone features

De-emphasis

no de-emphasis

Mute

no mute

Mode switch

ﬂat

Extended programming

Mixer gain channel 1

−6dB

Mixer gain channel 2

−6dB

MIC sensitivity

0 dB

Mixer mode switch

double differential

AGC control

disable AGC

AGC attack and decay time

11 ms and100 ns

AGC output level

−9dBFS

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