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)： 26/88頁(yè)
文件大?。?/td> 362K
代理商： TDA9870A
1998 Aug 10
26
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
Notes
1.
2.
All analog and digital supply ground pins are connected internally.
Set demodulator to AM mode. Apply an AM carrier (with 1 kHz and 100%) to one channel. Check AGC step. Switch
AGC off and set AGC to the gain step found. Measure the 1 kHz signal level of this channel and take it as a reference.
Switch to the other SIF input to which no signal is connected and which is terminated with 50
. Measure now the
1 kHz crosstalk signal level. The SIF source resistance should be low (50
).
Definitions of levels and level setting:
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). Nominal audio input levels:
external, mono: 500 mV (RMS);
9 dB (full-scale).
See also Tables 6 and 7.
FM source; in dual mode only A (respectively B) signal modulated; measured at B (respectively A) channel output;
V
o
= 1 V (RMS) of modulated channel.
FM source; in stereo mode only L (respectively R) signal modulated; measured at R (respectively L) channel output;
V
o
= 1 V (RMS) of modulated channel. The stereo channel separation may be limited by adjustment tolerances of
the transmitter.
If the supply voltage for the TDA9870A 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.
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 TDA9870A, 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 and 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).
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.
3.
4.
5.
6.
7.
8.
Crystal specification (fundamental mode)
f
xtal
C
L
C
1
C
0
Φ
pull
crystal frequency
load capacitance
series capacitance
parallel capacitance
pulling sensitivity
24.576
20
20
25
7
MHz
pF
fF
pF
C
L
changed from
18 to 16 pF
R
R
R
N
equivalent series resistance
equivalent series resistance of
unwanted mode
temperature range
adjustment tolerance
drift
ageing
at nominal frequency
2R
R
30
T
X
J
X
D
X
A
20
+25
+70
±
30
±
30
±
5
°
C
10
6
10
6
across temperature range
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
pF
6
–
10
year
6
–
10
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