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參數(shù)資料
| 型號(hào)： | 935263704518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 71/71頁(yè) |
| 文件大?。?/td> | 304K |
| 代理商： | 935263704518 |
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2000 Aug 04
9
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
handbook, full pagewidth
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TDA9874AH
MHB586
SCK
WS
SDO
SDA
VDDA3
VSSA3
CRESET
SIF1
Vref1
SIF2
OUTL
OUTR
VDDA1
VSSA1
VSSD1
VDDD1
n.c.
TP2
TP1
SCL
OUTM
P2
V
ref2
EXTIL
EXTIR
MONOIN
V
SSD3
V
DDD3
SYSCLK
V
SSA4
P1
ADDR1
XTALO
XTALI
TP3
TEST2
I ref
V
SSA2
V
DEC
TEST1
PCLK
ADDR2
VSSD2
NICAM
Fig.3 Pin configuration (QFP44).
6
FUNCTIONAL DESCRIPTION
6.1
Description of the demodulator and decoder
section
6.1.1
SIF INPUTS
Two inputs are provided, pin SIF1 and pin SIF2. For higher
SIF signal levels the SIF input can be attenuated with an
internal 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).
The AGC can be controlled via the I2C-bus; details are
given in Sections 7.3.2, 7.3.3 and 7.4.6.
6.1.3
MIXER
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
I2C-bus (see Sections 7.3.5 and 7.3.6) or via Easy
Standard Programming (ESP, see Section 7.3.23). When
receiving NICAM programs, a feedback signal is added to
the control word of the second carrier mixer to establish a
carrier-frequency loop.
6.1.4
FM AND AM DEMODULATION
An FM or AM input signal is fed through a switchable
band-limiting filter into 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 Wegener-Panda 1 encoded
satellite programs.
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