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59.5

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60.0

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60.5

NXP Semiconductors

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

Product specification

UDA1341TS

A 1-bit value to enable the AGC input. The default setting is given in Table 5.

Table 29 AGC control settings

A 2-bit value to program the mode of the digital mixer. There are four modes: double differential, input channel 1 select, input channel 2 select and digital mixer mode. The default setting is given in Table 5.

A 7-bit value to program the input channel 2 amplifier gain. The range is from 3 to +60.5 dB in steps of 0.5 dB. These settings are only valid when AGC control is disabled and not valid in the double differential mode.

Table 28 Mixer mode switch settings

Table 31 Input channel 2 amplifier gain settings

7.21.3.4

AGC control

7.21.3.3

Mixer mode

7.21.3.6

Input channel 2 amplifier gain

MM1

0 0 1 1

IG6 IG5 IG4 IG3 IG2

AG 0

FUNCTION

disable AGC: manual gain setting through IG (7 bits)

MM0

FUNCTION

IG1

1

A 3-bit value to program the attack and the decay parameters of the digital AGC. The default setting is given in Table 5.

0 1 0 1

double differential mode input channel 1 select (input channel 2 off) input channel 2 select (input channel 1 off)

digital mixer mode (input 1 × MA + input 2 × MB)

IG0

INPUT CHANNEL 2 AMPLIFIER GAIN (dB)

enable AGC: gain control with manual MIC sensitivity setting

A 2-bit value to program the AGC output level. The default setting is given in Table 5.

7.21.3.7

AGC time constant

7.21.3.5

AGC output level

AL1

AL0

0

0

9.0

0

1

11.5

1

0

15.0

1

1

17.5

Table 30 AGC output level settings

OUTPUT LEVEL

(dB FS)

AT2

AT1

AT

0

ATTACK TIME

DECAY TIME

(ms)

(ms)

0

0

0

11

100

0

0

1

16

100

0

1

0

11

200

0

1

1

16

200

1

0

0

21

200

1

0

1

11

400

1

1

0

16

400

1

1

1

21

400

Table 32 AGC time constant settings

2002 May 16

20

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