參數(shù)資料
型號： TUA6030
廠商： INFINEON TECHNOLOGIES AG
元件分類： 調(diào)諧器
英文描述： 3-BAND, VIDEO TUNER, PDSO38
封裝： PLASTIC, TSSOP-38
文件頁數(shù)： 13/49頁
文件大?。?/td> 882K
代理商： TUA6030
Functional Description
3 - 20
TUA6030, TUA6032
Wireless Components
Specification, January 2002
3.4
Circuit Description
3.4.1
Mixer-Oscillator block
The mixer-oscillator block includes three balanced mixers (one mixer with an
unbalanced high-impedance input and two mixers with a balanced low-imped-
ance input), two 2-pin asymmetrical oscillators for the LOW and the MID band,
one 4-pin symmetrical oscillator for the HIGH band, an IF amplifier, a reference
voltage, and a band switch.
Filters between tuner input and IC separate the TV frequency signals into three
bands. The band switching in the tuner front-end is done by using three PNP
port outputs. In the selected band the signal passes a tuner input stage with a
MOSFET amplifier, a double-tuned bandpass filter and is then fed to the mixer
input of the IC which has in case of LOW band a high-impedance input and in
case of MID or HIGH band a low-impedance input. The input signal is mixed
there with the signal from the activated on chip oscillator to the IF frequency
which is filtered out at the balanced mixer output pair by means of a parallel
tuned circuit. The following IF amplifier is capacitively coupled to the mixer out-
puts and has a low output impedance to drive the SAW filter directly.
3.4.2
PLL block
The oscillator signal is internally DC-coupled as a differential signal to the pro-
grammable divider inputs. The signal subsequently passes through a program-
mable divider with ratio N = 256 through 32767 and is then compared in a digital
frequency/phase detector with a reference frequency fref = 31.25, 50, 62.5 or
166.7 kHz. This frequency is derived from an unbalanced, low-impedance 4
MHz crystal oscillator (pin XTAL) divided by 128, 80,64 or 24. The reference fre-
quencies will be different with a quartz other than 4 MHz.
The phase detector has two outputs which drive two current sources of a charge
pump. If the negative edge of the divided VCO signal appears prior to the neg-
ative edge of the reference signal, the positive current source pulses for the
duration of the phase difference. In the reverse case the negative current
source pulses. If the two signals are in phase, the charge pump output (CP)
goes into the high-impedance state (PLL is locked). An active low-pass filter
integrates the current pulses to generate the tuning voltage for the VCO (inter-
nal amplifier, external pull-up resistor at VT and external RC circuitry). The
charge pump output is also switched into the high-impedance state if the control
bits T2, T1,T0 = 0, 1, 0. Here it should be noted, however, that the tuning volt-
age can alter over a long period in the high impedance state as a result of self
discharge in the peripheral circuity. VT may be switched off by the control bit OS
to allow external adjustments.
If the VCO is not oscillating the PLL locks to a tuning voltage of 33V (VTH).
相關(guān)PDF資料
PDF描述
TUA6034-T 3-BAND, VIDEO TUNER, PDSO38
TUA6034-V 3-BAND, VIDEO TUNER, QCC48
TUA6036-T 3-BAND, VIDEO TUNER, PDSO38
TUA6039F-2 3-BAND, VIDEO TUNER, QCC48
TUA6037F 3-BAND, VIDEO TUNER, QCC48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TUA6032 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3-Band TV Tuner IC
TUA6034 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3-Band Digital TV / Set-Top-Box Tuner IC TAIFUN
TUA6034_06 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3-Band Digital TV / Set-Top-Box Tuner IC TAIFUN
TUA6034DEMOBOARD 制造商:Infineon Technologies AG 功能描述:
TUA6034-T 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3-Band Digital TV / Set-Top-Box Tuner IC TAIFUN
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*