參數(shù)資料
型號(hào)： tua 6010xS
廠商： SIEMENS AG
英文描述： TV Mixer-Oscillator-PLL(電視混頻器-振蕩器-鎖相環(huán)電路)
中文描述： 電視攪拌機(jī)振蕩器鎖相環(huán)（電視混頻器-振蕩器-鎖相環(huán)電路）
文件頁(yè)數(shù)： 15/32頁(yè)
文件大?。?/td> 508K
代理商： TUA 6010XS
Functional Description
3 - 8
TUA 6010XS
preliminary
Wireless Components
Specification, August 1999
3.4
Circuit Description
3.4.1
Mixer-Oscillator block
The mixer oscillator section includes two balanced mixers (double balanced
mixer), two balanced oscillators for VHF and/or HYPER 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 switch ensures that only one mixer-oscillator block at a time
is activated. In the activated band the signal passes a frontend stage with MOS-
FET amplifier, a double-tuned bandpass filter and is then fed to the balanced
mixer input of the IC which has a low-impedance input.
The input signal is mixed there with the on chip oscillator signal from the acti-
vated oscillator section.
3.4.2
PLL block
The mixer-oscillator signal VCO/VCOx 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
= 62.5 kHz.
This frequency is derived from a balanced, low-impedance 4 MHz crystal oscil-
lator (pin Q, Qx) divided by Q = 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 sig-
nal 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 cir-
cuitry). 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 con-
trol bit OS to allow external adjustments.
When the VCO is not working the PLL locks to a tuning voltage of 33V.
By means of control bit 5I the pump current can be switched between two val-
ues 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 com-
pensated, for example.
相關(guān)PDF資料
PDF描述
tua 6012XS 2 Band TV Tuner(兩波段電視調(diào)諧器)
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tua 6014-S Single Chip for Terrestrial Television(電視調(diào)諧芯片)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TUA6012 制造商:SIEMENS 制造商全稱:Siemens Semiconductor Group 功能描述:Components for Entertainment Electronics
TUA6012XS 制造商:SIEMENS 制造商全稱:Siemens Semiconductor Group 功能描述:Components for Entertainment Electronics
TUA6014-K 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Components for Entertainment Electronics
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
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