參數(shù)資料
型號(hào)： TDA9870A
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 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(yè)數(shù)： 16/88頁(yè)
文件大小： 362K
代理商： TDA9870A
1998 Aug 10
16
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
6.3.1
A
NALOG CROSSBAR SWITCH AND ANALOG MATRIX
(see also Fig.6)
There are a number of analog input and output ports with
the TDA9870A. Analog source selector switches are
employed to provide the desired analog signal routing
capability. The analog signal routing is performed by the
analog crossbar switch section. A dual audio ADC
provides the connection to the DSP section and a dual
audio DAC provides the connection from the DSP section
to the analog crossbar switch. The digital signal routing is
performed by a digital crossbar switch.
The basic signal routing philosophy of the TDA9870A is
that each switch handles two signal channels at the same
time, e.g. left and right, language A and B, directly at the
source.
Each source selector switch is followed by an analog
matrix to perform further selection tasks, such as putting a
signal from one input channel, say language A, to both
output channels or for swapping left and right channels.
The analog matrix provides the functions given in Table 5
(see also Fig.5).
Table 5
Analog matrix functions
All switches and matrices are controlled via the I
2
C-bus.
MODE
MATRIX OUTPUT
LEFT OUTPUT
RIGHT OUTPUT
1
2
3
4
left input
right input
left input
right input
right input
left input
left input
right input
Fig.5 Analog matrix.
handbook, halfpage
MGK110
ANALOG
MATRIX
right input
left output
right output
6.3.2
SCART
INPUTS
The SCART specification allows for a signal level of up to
2 V (RMS). Because of signal handling limitations, due to
the 5 V supply voltage of the TDA9870A, it is necessary to
have fixed 3 dB attenuators at the SCART inputs to obtain
a 2 V input. This results in a
3 dB SCART-to-SCART
copy gain. If 0 dB copy gain is preferred (with maximum
1.4 V input), there are 3 dB and 0 dB amplifiers at the
outputs of SCART 1 and SCART 2 and at the line output.
The input attenuator is realized by an external series
resistor in combination with the input impedance, both of
which form a voltage divider. With this voltage divider the
maximum SCART signal level of 2 V (RMS) is scaled
down to 1.4 V (RMS) at the input pin.
6.3.3
E
XTERNAL AND MONO INPUTS
The 3 dB input attenuators are not required for the external
and mono inputs, because those signal levels are under
control of the TV designer. The maximum allowed input
level is 1.4 V (RMS). By adding external series resistors,
the external inputs can be used as an additional SCART
input.
6.3.4
SCART
OUTPUTS
The SCART outputs employ amplifiers with two gain
settings. The gain can be set to 3 dB or to 0 dB via the
I
2
C-bus. The 3 dB position is needed to compensate for
the 3 dB attenuation at the SCART inputs should
SCART-to-SCART copies with 0 dB gain be preferred
[under the condition of 1.4 V (RMS) maximum input level].
The 0 dB position is needed, for example, for an
external-to-SCART copy with 0 dB gain.
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