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參數(shù)資料
| 型號： | TUA6010XS |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | 2-BAND, VIDEO TUNER, PDSO28 |
| 封裝： | 1 MM HEIGHT, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大小： | 508K |
| 代理商： | TUA6010XS |
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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
fref = 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PDF資料 |
PDF描述 |
|---|---|
| TUA6010XS | VIDEO TUNER, PDSO28 |
| 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 |
相關代理商/技術參數(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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