參數(shù)資料
型號(hào)： TUA6024-2
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(yè)數(shù)： 7/40頁(yè)
文件大?。?/td> 693K
代理商： TUA6024-2
Functional Description
3 - 8
TUA6024-2
Wireless Components
Specification, July 2001
3.4
Circuit Description
3.4.1
General
In the normal mode (see Table 5-7 Test modes on page 31) the IC is compatible with
TUA6024-S and TUA6024-K. An extended mode makes a reference divider
ratio of 24 (see Table 5-8 Reference divider ratio on page 31) and two additional charge
3.4.2
Mixer-Oscillator block
The mixer oscillator section includes two balanced mixers (double balanced
mixer), two balanced oscillators for LOW and / or MID band and HIGH band, an
IF amplifier, 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 or three
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 bal-
anced mixer input of the IC which has in case of LOW / MID a high-impedance
input and in case of HIGH 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 high-impedance output pair by means of a
parallel tuned circuit. The following SAW preamplifier has a low output imped-
ance to drive the SAW filter directly.
3.4.3
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 to 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 R = 128, 80, 64 or 24.
The phase detector has two outputs that drive two current sources of opposite
polarity as charge pump. If the negative edge of the divided VCO signal appears
prior to the negative 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 fil-
ter 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 if the
相關(guān)PDF資料
PDF描述
TUA6024-K 2-BAND, VIDEO TUNER, PDSO28
TUA6024-S 2-BAND, VIDEO TUNER, PDSO28
TUA6026K 2-BAND, VIDEO TUNER, PDSO28
TUA6026S 2-BAND, VIDEO TUNER, PDSO28
TUA6026-K 2-BAND, VIDEO TUNER, PDSO28
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