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参数资料
| 型号： | TUA6039F-2 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 调谐器 |
| 英文描述： | 3-BAND, VIDEO TUNER, QCC48 |
| 封装： | GREEN, PLASTIC, VQFN-48 |
| 文件页数： | 17/62页 |
| 文件大小： | 1024K |
| 代理商： | TUA6039F-2 |
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Data Sheet
24
Revision 2.0, 2007-07-20
TUA 6039F-2, TUA 6037F
Functional Description
3.4
Circuit Description
3.4.1
Mixer-Oscillator block with SAW filter driver
The mixer-oscillator block includes three balanced mixers (one mixer with an unbalanced
high-impedance input and two mixers with a balanced low-impedance input), two 2-pin
asymmetrical oscillators for the LOW and the MID band, one 4-pin symmetrical oscillator
for the HIGH band, an SAW filter driver, a reference voltage and a band switch.
Filters between tuner input and IC separate the TV frequency signals into three bands.
The band switching in the tuner front-end is done by using three PNP port outputs. In the
selected band the signal passes a tuner input stage with a MOSFET amplifier, a double-
tuned bandpass filter and is then fed to the mixer input of the IC which has in case of
LOW band a high-impedance input and in case of MID or HIGH band a low-impedance
input. The input signal is mixed there with the signal from the activated on chip oscillator
to the IF frequency. The IF is filtered by means of an IF filter in between the 2 mixer
output pins and the 2 input pins of the following SAW filter driver. The SAW filter driver
has a low output impedance to drive the SAW filter directly.
3.4.2
PLL block
The oscillator signal is internally DC-coupled as a differential signal to 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
with a reference frequency f
ref = 31.25, 50, 62.5, 125, 142.86 or 166.67 kHz. This
frequency is derived from a low-impedance 4 MHz crystal oscillator (pins XTALIN,
XTALCAP) divided by 128, 80, 64, 32, 28 or 24. The reference frequencies will be
different with a quartz other than 4 MHz.
The phase detector has two outputs which drive four current sources of a 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 filter integrates the current pulses to generate the tuning
voltage for the VCO (internal amplifier, external pull-up resistor at V
T and external RC
circuitry). The charge pump output is also switched into the high-impedance state if the
control bits T2, T1, T0 = 0, 1, 0. 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. V
T may be switched off by the control bit OS to allow external
adjustments.
If the VCO is not oscillating the PLL locks to a tuning voltage of 33V (V
TH).
By means of control bits CP, T0, T1 and T2 the pump current can be switched between
four values by software. This programmability permits alteration of the control response
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| TUA6039F2XT | 制造商:Infineon Technologies AG 功能描述:Tuners PAL/NTSC 863.25MHz 48-Pin VQFN EP |
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| TUA6041 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:Low Power 3-Band Digital TV / Portable Tuner IC with Digital Alignment |
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| TUA6041XT | 功能描述:变容二极管 MOBILE RoHS:否 制造商:Skyworks Solutions, Inc. 电容:5.2 pF 反向电压:10 V 正向连续电流:20 mA 端接类型:SMD/SMT 封装 / 箱体:SC-79 封装:Reel |
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