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TDA18271HD Folha de dados(PDF) 6 Page - NXP Semiconductors |
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TDA18271HD Folha de dados(HTML) 6 Page - NXP Semiconductors |
6 / 70 page TDA18271HD_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 19 May 2009 6 of 70 NXP Semiconductors TDA18271HD Silicon Tuner IC 8. Functional description The RF input signal is driven to a low-noise amplifier. It is then band-pass filtered, amplified and fed to the image rejection mixer. The mixer downconverts the RF signal to a low IF depending on the channel bandwidth. Standard IF filters are implemented for 1.5 MHz, 6 MHz, 7 MHz and 8 MHz channel bandwidths; see Table 43. The Silicon Tuner can be used either as TV receiver or FM radio receiver. The TDA18271HD requires a single 16 MHz crystal for clock generation. When bit XTOUT_ON = 1, a clock signal is available on pins XTOUTP and XTOUTN to drive a second tuner, a channel decoder or an IF demodulator (TDA8295) for analog TV reception and FM radio. Remark: Most recent video decoders from NXP Semiconductors include a low IF demodulation function. 8.1 TV and FM reception The Silicon Tuner can be used in two modes, selectable via the I2C-bus: • TV reception: the RF signal must be connected to pin RF_IN • FM reception: the RF signal must be connected to pin FM_IN or RF_IN The RF_IN input pin can also be used for FM reception at the cost of software modification. The FM_IN input pin can only receive signals in the FM frequency range. 8.2 Master and slave operation The TDA18271HD allows easy dual-tuner configuration. Each individual tuner has to be set either to Master mode or Slave mode by applying a specific DC voltage to the XTOUT_MS pin; see Table 4. This will decide whether the crystal oscillator part is used as negative impedance connected to the crystal part or as a current buffer. In dual tuner applications: • The first tuner is set to Master mode • The second tuner has to be set to Slave mode In single tuner applications: • The tuner must be set to Master mode Table 4. Master/slave selection Voltage on pin XTOUT_MS Tuner type Crystal oscillator function 0 V to 0.1VCC master negative impedance presented to the crystal 0.4VCC to 0.6VCC slave current input buffer |
Nº de peça semelhante - TDA18271HD_09 |
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Descrição semelhante - TDA18271HD_09 |
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