參數(shù)資料
型號(hào)： TDA9875AH
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, QFP
文件頁(yè)數(shù)： 15/96頁(yè)
文件大?。?/td> 296K
代理商： TDA9875AH
1999 Dec 20
15
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
The beeper volume is adjustable with respect to full-scale
between 0 and
93 dB with 3 dB resolution. The beeper is
not effected by mute.
Soft mute provides a mute ability in addition to volume
control with a well defined time (32 ms) after which the soft
mute is completed. A smooth fading is achieved by a
cosine masking.
6.2.7
H
EADPHONE
(A
UXILIARY
)
CHANNEL
The matrix provides the following functions: forced mono,
stereo, channel swap, channel 1 and channel 2
(or C and S in Dolby Surround Pro Logic mode).
Volume is controlled individually for each channel in a
range from +24 to
83 dB with 1 dB resolution. There is
also a mute position. For the purpose of a simple control
software in the microcontroller, the decimal number that is
sent as an I
2
C-bus data byte for volume control is identical
to the volume setting in dB (e.g. the I
2
C-bus data byte +10
sets the new volume value to +10 dB).
Balance can be realized by independent control of the left
and right channel volume settings.
Bass is adjustable between +15 and
12 dB with 1 dB
resolution and treble is adjustable between
+12 and
12 dB with 1 dB resolution. For the purpose of a
simple control software in the microcontroller, the decimal
number that is sent as an I
2
C-bus data byte for bass or
treble is identical to the new bass or treble setting in dB
(e.g. the I
2
C-bus data byte +8 sets the new value
to +8 dB).
The beeper provides tones in a range from approximately
400 Hz to 30 kHz. The frequency can be selected via the
I
2
C-bus. The beeper output signal is added to the
loudspeaker and headphone channel signals. The beeper
volume is adjustable with respect to full-scale between
0 and
93 dB with 3 dB resolution. The beeper is not
effected by mute.
Soft mute provides a mute ability in addition to volume
control with a well defined time (32 ms) after which the soft
mute is completed. A smooth fading is achieved by a
cosine masking.
6.2.8
F
EATURE INTERFACE
The feature interface comprises two I
2
S-bus input/output
ports and a system clock output. Each I
2
S-bus port is
equipped with level adjust facilities that can change the
signal level in a range from +15 to
15 dB with 1 dB
resolution. Outputs can be disabled to improve EMC
performance.
The I
2
S-bus output matrix provides the following functions:
forced mono, stereo, channel swap, channel 1 and
channel 2.
One example of how the feature interface can be used in
a TV set is to connect an external Dolby Surround Pro
Logic DSP, such as the SAA7710, to the I
2
S-bus ports.
Outputs must be enabled and a suitable master clock
signal for the DSP can be taken from pin SYSCLK.
A stereo signal from any source will be output on one of
the I
2
S-bus serial data outputs and the four processed
signal channels will be entered at both I
2
S-bus serial data
inputs. Left and right could then be output to the power
amplifiers via the Main channel, centre and surround via
the Auxiliary channel.
6.2.9
C
HANNEL FROM THE AUDIO
ADC
The signal level at the output of the ADC can be adjusted
in a range from +15 to
15 dB with 1 dB resolution.
The audio ADC itself is scaled to a gain of
6 dB.
6.2.10
C
HANNEL TO THE ANALOG CROSSBAR PATH
Level adjust with control positions 0, +3, +6 and +9 dB.
6.2.11
D
IGITAL CROSSBAR SWITCH
Input channels to the crossbar switch are from the audio
ADC, I
2
S1, I
2
S2, FM path, NICAM path and from the
loudspeaker channel path after matrix and AVL
(see Fig.8).
Output channels comprise loudspeaker, headphone, I
2
S1,
I
2
S2 and audio DACs for line output and SCART. I
2
S1 and
I
2
S2 outputs also provide digital outputs from the
loudspeaker and headphone channels, but without the
beeper signals.
6.2.12
S
IGNAL GAIN
There are a number of functions that can provide signal
gain, e.g. volume, bass and treble control. Great care has
to be taken when using gain with large input signals in
order not to exceed the maximum possible signal swing,
which would cause severe signal distortion. The nominal
signal level of the various signal sources to the digital
crossbar switch should be 15 dB below digital full-scale
(
15 dB full-scale). This means that a volume setting of,
say, +15 dB would just produce a full-scale output signal
and not cause clipping, if the signal level is nominal.
Sending illegal data patterns via the I
2
C-bus will not cause
any changes of the current setting for the volume, bass,
treble, bass boost and level adjust functions.
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