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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)： | 10/88頁 |
| 文件大?。?/td> | 362K |
| 代理商： | TDA9870A |
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1998 Aug 10
10
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
6
FUNCTIONAL DESCRIPTION
6.1
Description of the demodulator and decoder
section
6.1.1
SIF
INPUT
Two input pins are provided, SIF1 e.g. for terrestrial TV
and SIF2 e.g. for a satellite tuner. For higher SIF signal
levels the SIF input can be attenuated with an internally
switchable
10 dB resistor divider. As no specific filters are
integrated, both inputs have the same specification giving
flexibility in application. The selected signal is passed
through an AGC circuit and then digitized by an 8-bit ADC
operating at 24.576 MHz.
6.1.2
AGC
The gain of the AGC amplifier is controlled from the ADC
output by means of a digital control loop employing
hysteresis. The AGC has a fast attack behaviour to
prevent ADC overloads and a slow decay behaviour to
prevent AGC oscillations. For AM demodulation the AGC
must be switched off. When switched off, the control loop
is reset and fixed gain settings can be chosen
(see Table 14; subaddress 0).
The AGC can be controlled via the I
2
C-bus. Details can be
found in the I
2
C-bus register definitions (see Chapter 10).
6.1.3
M
IXER
The digitized input signal is fed to the mixers, which mix
one or both input sound carriers down to zero IF. A 24-bit
control word for each carrier sets the required frequency.
Access to the mixer control word registers is via the
I
2
C-bus.
6.1.4
FM
AND
AM
DEMODULATION
An FM or AM input signal is fed via a band-limiting filter to
a demodulator that can be used for either FM or AM
demodulation. Apart from the standard (fixed)
de-emphasis characteristic, an adaptive de-emphasis is
available for encoded satellite programs. A stereo decoder
recovers the left and right signal channels from the
demodulated sound carriers. Both the European and
Korean stereo systems are supported.
6.1.5
FM
IDENTIFICATION
The identification of the FM sound mode is performed by
AM synchronous demodulation of the pilot signal and
narrow-band detection of the identification frequencies.
The result is available via the I
2
C-bus interface. A selection
can be made via the I
2
C-bus for B/G, D/K and M standard
and for three different modes that represent different
trade-offs between speed and reliability of identification.
6.1.6
C
RYSTAL OSCILLATOR
The crystal oscillator (XO) is illustrated in Fig.8
(see Chapter 12). The circuitry of the XO is fully
integrated, only the external 24.576 MHz crystal is
needed.
6.1.7
T
EST PINS
Both test pins are active HIGH, in normal operation of the
device they are connected to V
SSD1
. Test functions are for
manufacturing tests only and are not available to
customers. Without external circuitry these pads are pulled
down to LOW level with internal resistors.
6.1.8
P
OWER FAIL DETECTOR
The power fail detector monitors the internal power supply
for the digital part of the device. If the supply has
temporarily been lower than the specified lower limit, the
power-on reset bit POR, transmitter register subaddress 0
(see Section 10.4.1), will be set to HIGH. The CLRPOR bit,
slave register subaddress 1 (see Section 10.3.2), resets
the power-on reset flip-flop to LOW. If this is detected, an
initialization of the TDA9870A has to be performed to
ensure reliable operation.
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