參數(shù)資料
型號： TDA9884HN
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO/VIDEO DEMODULATOR, PQCC32
封裝： 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, HVQFN-32
文件頁數(shù)： 57/58頁
文件大?。?/td> 290K
代理商： TDA9884HN
TDA9884_2
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 May 2006
8 of 58
Philips Semiconductors
TDA9884
I2C-bus controlled multistandard alignment-free IF-PLL
FPLL detector
VCO and divider
AFC and digital acquisition help
Video demodulator and amplier
Sound carrier trap
SIF amplier
SIF-AGC detector
Single reference QSS mixer
AM demodulator
FM demodulator and acquisition help
Audio amplier and mute time constant
Internal voltage stabilizer
I2C-bus transceiver and MAD
7.1 VIF amplier
The VIF amplier consists of three AC-coupled differential stages. Gain control is
performed by emitter degeneration. The total gain control range is typically 66 dB. The
differential input impedance is typically 2 k
in parallel with 3 pF.
7.2 Tuner AGC and VIF-AGC
This block adapts the voltages, generated at the VIF-AGC and SIF-AGC detectors, to the
internal signal processing at the VIF and SIF ampliers and performs the tuner AGC
control current generation. Normally it is derived from the VIF-AGC, for the true split sound
mode it is derived from the SIF-AGC. The onset of the tuner AGC control current
generation can be set either via the I2C-bus (see Table 16) or optionally by a
potentiometer at pin TOP (in case that the I2C-bus information cannot be stored). The
presence of a potentiometer is automatically detected and the I2C-bus setting is disabled.
Furthermore, derived from the AGC detector voltage, a comparator is used to test if the
corresponding VIF input voltage is higher than 200
V. This information can be read out
via the I2C-bus (bit VIFLEV = 1).
7.3 VIF-AGC detector
Gain control is performed by sync level detection (negative modulation) or peak white
detection (positive modulation).
For negative modulation, the sync level voltage is compared with a reference voltage
(nominal sync level) by a comparator which charges or discharges the integrated AGC
capacitor directly for the generation of the required VIF gain. With mobile mode the
currents are increased by a factor of approximately 8 for very fast reaction. By use of an
AGC event detector, the gain increase time constant (discharge current) additionally
reduces in with a too-low VIF signal.
For positive modulation, the white peak level voltage is compared with a reference voltage
(nominal white level) by a comparator which charges (fast) or discharges (slow) the
external AGC capacitor directly for the generation of the required VIF gain. The need of a
相關(guān)PDF資料
PDF描述
TDA9885HN/V5 AM/FM, AUDIO/VIDEO DEMODULATOR, PQCC32
TDA9885T/V5 AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
TDA9885TS/V5 AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
TDA9886HN/V5 AM/FM, AUDIO/VIDEO DEMODULATOR, PQCC32
TDA9886T/V5 AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA9884TS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:I2C-bus controlled multistandard alignment-free IF-PLL for mobile reception
TDA9884TS/V1 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF DEMODULATOR RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1,112 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1,118 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1/S1,11 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
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