參數(shù)資料
型號(hào)： TUA6010XS
廠商： SIEMENS A G
元件分類： 調(diào)諧器
英文描述： VIDEO TUNER, PDSO28
文件頁(yè)數(shù)： 30/32頁(yè)
文件大?。?/td> 839K
代理商： TUA6010XS
TUA 6010XS
Semiconductor Group
7
05.96
3
Circuit Description
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 front-end stage with MOSFET 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 activated
oscillator section.
PLL Block
The mixer oscillator signal
V
CO/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 = 62.5 kHz. This frequency is derived from
a balanced, low-impedance 4 MHz crystal oscillator (pin Q, Q) 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 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. lf the two
signals are in phase, the charge pump output (CHGPMP) goes into the high-impedance
state (PLL is locked). An active lowpass filter integrates the current pulses to generate
the tuning voltage for the VCO (internal amplifier, external pull-up 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 circuitry. TUNE may be switched off by the control bit OS to
allow external adjustments.
By means of a 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.
The software-switched ports P0, P1, P2 are general-purpose open-collector outputs.
The test bit T1 = ‘1’, switches the test signals
f
REF (4 MHz/32) and Cy (divided input
signal) to P0 and P1 respectively. P0, P1, P2 are bidirectional: P0 and P1 are TTL inputs;
P2 is an A/D converter input.
相關(guān)PDF資料
PDF描述
TUA6014-K 2-BAND, VIDEO TUNER, PDSO28
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
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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