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參數(shù)資料
型號(hào)： TUA6037F
廠商： INFINEON TECHNOLOGIES AG
元件分類： 調(diào)諧器
英文描述： 3-BAND, VIDEO TUNER, QCC48
封裝： GREEN, PLASTIC, VQFN-48
文件頁(yè)數(shù)： 18/62頁(yè)
文件大小： 1024K
代理商： TUA6037F
Data Sheet
25
Revision 2.0, 2007-07-20
TUA 6039F-2, TUA 6037F
Functional Description
of the PLL in the locked-in state. In this way different VCO gains can be compensated,
for example. Furthermore, in order to obtain best results for phase noise, reference
frequency rejection and PLL stability especially in a wideband system like a digital tuner,
it is necessary to set the charge pump current to different values depending on the band
and frequency used. This is to cope with the variations of the different parameters that
set the bandwidth. The selection can be done in the application and requires for each
frequency to program not only the divider ratios, but also the band and the best charge
pump current.
The software controlled ports P0 to P4 are general purpose open-collector outputs. The
test bits T2, T1, T0, OS = 0, 1, 0, 1 switch the test signals f
div / 2 (divided input signal)
and f
ref (i.e. 4 MHz / 64) to P0 and P1 respectively.
The lock detector resets the lock flag FL if the width of the charge pump current pulses
is greater than the period of the crystal oscillator (i.e. 250 ns). Hence, if FL = 1, the
maximum deviation of the input frequency from the programmed frequency is given by
f = ± I
P (KVCO / fXTAL) (C1 + C2) / (C1 C2)
where I
P is the charge pump current, KVCO the VCO gain, fXtal the crystal oscillator
frequency and C
1, C2 the capacitances in the loop filter (see Section 4.2). As the charge
pump pulses at i.e. 62.5 kHz (= f
ref), it takes a maximum of 16 s for FL to be reset after
the loop has lost lock state.
Once FL has been reset, it is set only if the charge pump pulse width is less than 250 ns
for eight consecutive f
ref periods. Therefore it takes between 128 and 144 s for FL to be
set after the loop regains lock.
3.4.3
RF AGC
The RF AGC stage detects the level of the SAW filter driver output signal. If the detected
level is below the RF AGC take-over point, a external capacity will be charged with the
source current of 300 nA or 9 A (release current). If the detected level is above the RF
AGC take-over point, the external capacity will be discharged with the sink current of
100 A (attack current). The integrated current generates the AGC voltage for gain
control of the tuners input transistors. The RF AGC take-over and the time constant are
selectable by the I
2C bus (see Table 13).
An integrated RF AGC buffer allows to monitor the AGC voltage without any influence
on the tuner gain control.
3.4.4
IF AGC amplifier
Coming out of the SAW filter the IF signal is sent through a VGA (Variable Gain Amplifier)
which will set the differential IF output signal to the desired level (preferably 1 Vpp). The
gain of the VGA is determined by the DC-voltage at pin IFAMPAGC
相關(guān)PDF資料
PDF描述
TUA6039 3-BAND, VIDEO TUNER, QCC48
TUA6039-2 3-BAND, VIDEO TUNER, QCC48
TUA6037 3-BAND, VIDEO TUNER, QCC48
TUA6041-2 3-BAND, VIDEO TUNER, QCC48
TUA6045-2 3-BAND, VIDEO TUNER, QCC48
相關(guān)代理商/技術(shù)參數(shù)
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TUA6037FXT 制造商:Infineon Technologies AG 功能描述:Tuners PAL/NTSC 863.25MHz 48-Pin VQFN EP
TUA6039 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3 Band Digital / Hybrid Tuner IC with integrated IF AGC amplifier
TUA6039-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3 Band Digital / Hybrid Tuner IC with integrated IF AGC amplifier
TUA6039F-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3 Band Digital / Hybrid Tuner IC with integrated IF AGC amplifier
TUA6039F2XT 制造商:Infineon Technologies AG 功能描述:Tuners PAL/NTSC 863.25MHz 48-Pin VQFN EP
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