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參數(shù)資料
| 型號： | TDA6060G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 23/27頁 |
| 文件大小： | 421K |
| 代理商： | TDA6060G |
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SIEMENS
Preliminary IC-SPECIFICATION
TDA 6060XS, TDA 6060G
The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages.All rights, including rights
created by patent grant or registration of a utility model or design, are reserved.
11.11.1998
V66047-S0894-A100-V3-76D4
page 5
Circuit Descripton
General Description:
Modulator block
The modulator section includes a gain adjustable video amplifier, a double balanced mixer working as a AM
video modulator for positive or negative modulation, a balanced oscillator for VHF, Hyper band and UHF, a
sound modulator suitable for FM and AM modulation, a programmable sound carrier oscillator and a reference
voltage source.
The audio signal is coupled to the gain settable audio pre-amplifier of the FM AF input (AudinFM) and to the
AM input amplifier (AudinAM). The pre-emphasis is done with an external circuitry in front of the FM audio
input. The FM audio amplifier allows a gain setting in four steps with the AU0 / 1 bits in the negative video
modulation mode (PN = 0). The amplified audio signal is fed to the FM modulator. The modulated sound
carrier is filtered by a tracked bandpass filter and added to the video signal. In the positve video modulation
mode the the audio signal is directly fed to the AM sound modulator. The sound carriers are generated by a
programmable on chip oscillator. The four possible frequencies are 4.5, 5.5, 6.0 and 6.5 MHz (2bit). To
increase the speed of the sound PLL the loop filter current can be switched to 5I with the audio mode bits (table
4). A second FM or NICAM sound carrier may be added via the input SC2in to the internally generated carrier.
The SC2in input is referenced to Audgnd and can be switched off by connecting SC2in to the supply voltage.
The positve video signal is capacitively coupled to the video input pin (Vidin). An internal clamping circuit is
referenced to the sync tip level. If the video signal exceeds the maximum level the peak white level is clipped.
The clipping circuit acts also as a detector and sets a flag (FLV) for the I2C bus. The video input amplifier
allows a gain setting in four steps. The polarity of the video signal can be switched for positve or negative
modulation. The setting to positve modulation is combined with the AM modulation of the sound carrier. For
the residual carrier adjustment a sawtooth test picture is used when the video modulator is in overmodulation
mode.This mode is active by conneting test pin T1 to ground.
The adjustments of the modulation depth and the picture to sound carrier ratio can be done in four steps.
The RF oscillator works as gain controlled LC tuned astable multivibrator. The output of the oscillator is
decoupled by two isolation amplifiers, one for the modulator mixer and one for the synthesizer PLL. The VCO
can be switched off by setting both audio mode bits to 1 in positive modulation mode (table 4)
The added sound carrier and video signals are mixed with the RF oscillator signal in the double balanced mixer
and then fed to both RF outputs (Modout1 / Modout2)
.
PLL and I2C bus
The oscillator signal for the RF modulator 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
32764 by 4 (TDA 6060G: 258 through 32766 by 4) 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 oscillator (pin Q, Qx) or from a external signal source 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. 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 circuitry). 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 control bit OS to allow external adjust-
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA6060XS | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Video-Modulator with PLL |
| TDA6101 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Video output amplifier |
| TDA6101BQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single Video Amplifier |
| TDA6101Q | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Video output amplifier |
| TDA6101Q/N3,112 | 功能描述:視頻放大器 VIDEO OUTPUT AMPLIFIER RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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