參數(shù)資料
型號(hào)： TUA6014-K
廠商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 調(diào)諧器
英文描述： 2-BAND, VIDEO TUNER, PDSO28
封裝： 1 MM HEIGHT, PLASTIC, TSSOP-28
文件頁(yè)數(shù)： 3/31頁(yè)
文件大?。?/td> 420K
代理商： TUA6014-K
TUA 6012
TUA 6014
Semiconductor Group
11
1998-09-01
2
Circuit Description
2.1
Mixer-Oscillator Block
The mixer oscillator section includes two balanced mixers (double balanced mixer), two
balanced oscillators for VHF low and/or VHF high band and UHF, a reference voltage
source and a band switch.
Filters between tuner input and IC separate the TV frequency signals into two bands.
The band switching in the tuner front-end is done by using two, three or four port outputs.
In the selected band the signal passes a tuner input stage with MOSFET amplifier, a
double-tuned bandpass filter and is then fed to the balanced mixer input of the IC which
has in case of VHF low/VHF high a high-impedance input and in case of UHF a low-
impedance input. The VHF low/VHF high input can be used unsymmetrically by
capacitively grounding one of the input pins. The input signal is mixed there with the
signal from the activated on chip oscillator to the IF frequency and is available at the
balanced high-impedance output pair (IFout/IFout).
2.2
PLL Block
The mixer-oscillator signal VCO/VCO is internally DC-coupled as a differential signal at
the programmable divider inputs. The signal subsequently passes through a
programmable divider with ratio N = 256 through 32767 and is then compared in a digital
frequency/phase detector to a reference frequency
f
ref = 4 MHz / reference divider ratio
(
f
ref = 31.25 kHz, 50 kHz or 62.5 kHz). This frequency is derived from a unbalanced, low-
impedance 4 MHz crystal oscillator (pin Q) divided by reference divider ratio
(programmable reference divider ratio = 128, 80 or 64).
The phase detector has two outputs, UP and DOWN that drive two current sources
I+
and
I- of a charge pump. If the negative edge of the divided VCO signal appears prior to
the negative edge of the reference signal, the
I+ current source pulses for the duration
of the phase difference. In the reverse case the
I- current source pulses. If the two
signals are in phase, the charge pump output (CHGPMP) 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 (internal amplifier, external pullup resistor at TUNE and
external RC circuitry). The charge pump output is also switched into the high-impedance
state when the control bit T0 = 1. Here it should be noted, however, that the tuning
voltage can alter over a long period in the high-impedance state as a result of self-
discharge in the peripheral circuity. TUNE may be switched off by the control bit OS to
allow external adjustments.
If the VCO is not working the PLL locks to a tuning voltage of 33 V.
By means of control bit 5I the pump current can be switched between two values by
software. This programmability permits alteration of the control response of the PLL in
the locked-in state. In this way different VCO gains can be compensated, for example.
相關(guān)PDF資料
PDF描述
TUA6014-S 2-BAND, VIDEO TUNER, PDSO28
TUA6014XS 2-BAND, VIDEO TUNER, PDSO28
TUA6012XS 2-BAND, VIDEO TUNER, PDSO28
TUA6020 2-BAND, VIDEO TUNER, PDSO28
TUA6022-K 2-BAND, VIDEO TUNER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TUA6014-S 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Components for Entertainment Electronics
TUA6014XS 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Components for Entertainment Electronics
TUA6020 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:2 Band TV Tuner Mixer-Oscillator-PLL with balanced IF-Amplifier
TUA6020XT 制造商:Infineon Technologies AG 功能描述:TV Tuner Mixer-Oscillator-PLL with balanced IF-Amplifier 28-Pin TSSOP
TUA6024-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:2 Band TV Tuner Mixer-Oscillator-PLL with balanced IF-Amplifier
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