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NXP Semiconductors

Product 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 Status

FEATURE

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 ms 9 dB FS

2002 May 16

14

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