參數(shù)資料
型號(hào)： TDA9875
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
文件頁(yè)數(shù)： 28/92頁(yè)
文件大?。?/td> 279K
代理商： TDA9875
1998 Feb 13
28
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
Notes to the characteristics
1.
ADC level adjust = +6 dB, all other level adjusts = 0 dB, if external
3 dB divider is used set output buffer gain to
+3 dB, tone control to 0 dB, AVL off and volume control to 0 dB.
2.
Due to companding, the quantization noise of the NICAM system limits signal-to-noise ratio to 62 dB
(unweighted; RMS value).
3.
Definition of nominal levels:
The full-scale level for analog audio signals is V
FS
= 1.4 V (RMS). The nominal level at the digital crossbar switch is
defined at
15 dB (full-scale).
a) Audio input nominal levels:
SCART: 350 mV (at pin);
12 dB (full-scale)
external, mono: 500 mV;
9 dB (full-scale)
b) FM/AM path nominal (maximum) levels:
system M: 15 kHz deviation;
23.7 dB (full-scale)
system B/G, D/K, I: 27 kHz deviation;
18.6 dB (full-scale)
SAT stereo (maximum): 50 kHz deviation;
13.3 dB (full-scale)
SAT mono (maximum): 85 kHz deviation;
8.7 dB (full-scale)
AM: 54% modulation; full-scale SIF ADC;
20 dB (full-scale)
c) NICAM path nominal (maximum) levels:
system B/G:
18.2 dB (full-scale)
system I:
22.8 dB (full-scale)
maximum level: 0.0 dB (full-scale).
4.
If the supply voltage for the TDA9875 is switched off, because of the ESD protection circuitry, all audio input pins are
short-circuited. To avoid a short-circuit at the SCART inputs a 15 k
resistor (
3 dB divider) has to be used.
5.
The SCART specification allows a signal level of up to 2 V (RMS). Because of signal handling limitations due to the
5 V supply voltage for the TDA9875, there is a need for fixed 3 dB attenuators at the SCART inputs. To achieve
SCART-to-SCART copies with 0 dB gain, there are +3 dB/0 dB amplifiers at the outputs of SCART 1 and SCART 2
and at the line output. The attenuator is realized by an internal resistor that works together with an external series
resistor as a voltage divider. With this voltage divider the maximum SCART input signal level of 2 V (RMS) is scaled
down to 1.4 V (RMS) at the input pin. To avoid clipping, the +3 dB gain must not be used if the SCART input signal
is larger than 1.4 V (RMS).
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參數(shù)描述
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