參數(shù)資料
型號(hào)： TDA9870A
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, PDIP64
封裝： SHRINK, PLASTIC, DIP
文件頁數(shù)： 13/88頁
文件大小： 362K
代理商： TDA9870A
1998 Aug 10
13
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
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 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.
6.2.6
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 of
±
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.
6.2.7
C
HANNEL FROM THE AUDIO
ADC
The signal level at the output of the ADC can be adjusted
in a range of
±
15 dB with 1 dB resolution. The audio ADC
itself is scaled to a gain of
6 dB.
6.2.8
C
HANNEL TO THE ANALOG CROSSBAR PATH
Level adjust with control positions 0 dB, +3 dB, +6 dB
and +9 dB.
6.2.9
D
IGITAL CROSSBAR SWITCH
(see Fig.6)
Input channels to the crossbar switch are from the audio
ADC, I
2
S1, I
2
S2, FM path and from the loudspeaker
channel path after matrix and AVL.
Output channels comprise loudspeaker, headphone, I
2
S1,
I
2
S2 and the audio DACs for line output and SCART.
The I
2
S1 and I
2
S2 outputs also provide digital outputs from
the loudspeaker and headphone channels, but without the
beeper signals.
6.2.10
G
ENERAL
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.
6.2.11
E
XPERT MODE
The TDA9870A provides a special expert mode that gives
direct write access to the internal Coefficient RAM (CRAM)
of the DSP. It can be used to create user-defined
characteristics, such as a tone control with different corner
frequencies or special boost/cut characteristics to correct
the low-frequency loudspeaker and/or cabinet frequency
responses by means of the bass boost filter. However, this
mode must be used with great care.
More information on the functions of this device, such as
the number of coefficients per function, their default
values, memory addresses, etc., can be made available
on request.
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