UCB1510DB Просмотр технического описания (PDF) - Philips Electronics
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UCB1510DB Datasheet PDF : 32 Pages
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Philips Semiconductors
UCB1510
AC97 digital modem codec
Table 3: Sampling frequencies
Sampling frequency (Hz)
Register 0x40
value
7200
0x1C20
8000
0x1F40
8228.57 (57600/7)
0x2024
8400
0x20D0
9000
0x2328
9600
0x2580
10285.71 (72000/7)
0x282D
12000
0x2EE0
13714.29 (96000/7)
0x3592
16000
0x3E80
19200
0x4B00
24000
0x5DC0
48000
0xBB80
Support
no
yes
no
no
no
yes
no
yes
yes
yes
yes
yes
no
AC ‘97
requirements
recommended
required
recommended
recommended
recommended
required
recommended
recommended
required
required
recommended
recommended
recommended
Any programmed vlaue above 24 kHz will lead to a 24 kHz sampling rate.
Changing the sampling rate while the codec is active may lead to unpredictable
results in the ADC and DAC chains and should be avoided.
The output section of the telecom codec is designed to interface with a 600 Ω line
through an isolation transformer. The built in mute function is activated by the
DAC Mute bit in register 0x46. The output driver remains active in the mute mode,
however no output signal is produced.
8.1 Digital filters
These filters are tailored for high speed modem performance.
A voice band filter can be activated to reduce the noise in the lower frequencies.
Table 4: Filter characteristics
Parameter
Group delay
Pass band ripple
Out of band rejection
Pass band
Transition band
Voice band filter rejection band
Voice band filter cutoff frequency
Condition
>0.55 fs
(no voice band filter)
0-0.0018 fs
Value
25 samples
±0.1 dB
-50 dB
0.0016 to 0.45 fs
0.45 to 0.55 fs
30 dB
0.05 fs
9397 750 06856
Preliminary specification
Rev. 01 — 4 February 2000
© Philips Electronics N.V. 2000. All rights reserved.
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