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1999 May 10 25
Philips Semiconductors Preliminary specification
Universal Serial Bus (USB) CODEC UDA1325
Internal registers
Table 17 PGA gain registers
Table 18 ADIF control registers
ADDRESS REGISTER COMMENTS BIT VALUE
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 = −3dB
001 = 0 dB
010 = 3 dB
011=9dB
100 = 15 dB
101 = 21 dB
110=27dB
111=27dB
PGA gain left channel 2, 1 and 0 000 = −3dB
001 = 0 dB
010 = 3 dB
011=9dB
100 = 15 dB
101 = 21 dB
110=27dB
111=27dB
ADDRESS REGISTER COMMENTS BIT VALUE
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