CS4299-BQZR Cirrus Logic Inc, CS4299-BQZR Datasheet - Page 11

• Manufacturer Part Number: CS4299-BQZR
• Description: IC AC97 Codec With SRC
• Manufacturer: Cirrus Logic Inc

DS319-BQPP2
tain the read data in its Slot 2. Write operations are
similar, with the register index in Slot 1 and the
write data in Slot 2 of a SDATA_OUT frame. The
function of each input and output frame is detailed
in Section 3, AC Link Frame Definition. Individual
register descriptions are found in Section 4, Regis-
ter Interface.
2.3
The Sample Rate Converters (SRCs) provide high
accuracy digital filters supporting sample frequen-
cies other than 48 kHz to be captured from the
CS4299 or played from the controller. AC ’97 re-
quires support for two audio rates (44.1 and
48kHz). In addition, the Intel
(ICHx) specification requires support for five more
audio rates (8, 11.025, 16, 22.05, and 32). The
CS4299 supports all these rate, as shown in Table 7
on page 29.
2.4
The CS4299-BQ has two output mixers, illustrated
in Figure 8. The stereo output mixer sums together
the analog inputs to the CS4299-BQ, including the
PC_BEEP and PHONE signals, according to the
settings in the volume control registers. The stereo
output mix is sent to the LINE_OUT and
Sample Rate Converters
Output Mixer
®
I/O Controller Hub
ALT_LINE_OUT pins on the CS4299-BQ. The
mono output mixer generates a monophonic sum of
the left and right channels from the stereo input
mixer. The mono output mix is sent to the
MONO_OUT output pin on the CS4299-BQ.
2.5
The input multiplexer controls which analog input
is sent to the ADCs. The output of the input mux is
converted to stereo 18-bit digital PCM data and
sent to the controller by means of the AC-link
SDATA_IN signal.
2.6
The CS4299-BQ volume registers control analog
input levels to the input mixer and analog output
levels, including the master volume level, and the
alternate volume level. The PC_BEEP volume con-
trol uses 3 dB steps with a range of 0 dB to -45 dB
attenuation. All other analog volume controls use
1.5 dB steps. The analog inputs have a mixing
range of +12 dB signal gain to -34.5 dB signal at-
tenuation. The analog output volume controls have
from 0 dB to -94.5 dB attenuation for LINE_OUT
and from 0 dB to -46.5 dB attenuation for
ALT_LINE_OUT and MONO_OUT.
Input Mux
Volume Control
CS4299-BQ
CS4299-BQ
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