Philips UDA1325 用户手册

1999 May 10

25

Philips Semiconductors

Preliminary specification

Universal Serial Bus (USB) CODEC

UDA1325

Table 17 PGA gain registers

Table 18 ADIF control registers

0800h

PGA gain register

reserved

7

X

PGA input selection

6

0 (do not change it)

PGA gain right channel

5, 4 and 3 000 =

−

3 dB

001 = 0 dB
010 = 3 dB
011 = 9 dB
100 = 15 dB
101 = 21 dB
110 = 27 dB
111 = 27 dB

PGA gain left channel

2, 1 and 0 000 =

−

3 dB

001 = 0 dB
010 = 3 dB
011 = 9 dB
100 = 15 dB
101 = 21 dB
110 = 27 dB
111 = 27 dB

0801h

ADIF control register

reserved

7

X

number of bits per audio sample
to be transmitted to the host

6 and 5

00 = reserved

01 = 8 bits audio samples

10 = 16 bits audio samples

11 = 24 bits audio samples

mono/stereo selection

4

0 = mono

1 = stereo

selection audio input recording
channel

3

0 = digital serial audio input

1 = analog input

selection high-pass filter of
ADIF (DC-filter)

2

0 = high-pass filter off

1 = high-pass filter on

I

2

S-bus input serial input format

recording channel

1 and 0

00 = I

2

S-bus

01 = 16-bit LSB justified

10 = 18-bit LSB justified

11 = 20-bit LSB justified