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TDA18211HD Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA18211HD Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 66 page  TDA18211HD_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 2 June 2009 6 of 66 NXP Semiconductors TDA18211HD DVB-T 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, which depends on channel bandwidth (standard IF filters are implemented for 6/7/8 MHz channel bandwidths; see Table 41). The gain between the antenna pin (pin RF_IN) and the loop-through pin (pin LT) is 0 dB. The TDA18211HD requires a single 16 MHz crystal for clock generation. When bit XTOUT_ON = 1, a differential sine wave clock reference is available on pins XTOUTP and XTOUTN to drive a channel decoder. 8.1 Master and slave operation The TDA18211HD allows easy dual-tuner configuration. Each individual tuner has to be set either in Master mode or Slave mode by applying a DC voltage on 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 application: • The first tuner is set in Master mode • The second tuner has to be set in Slave mode In single-tuner application: • The tuner must be set in Master mode. 8.2 Tuner outputs The tuner provides a slave tuner output (pin STO) and a loop-through output (pin LT). Those outputs are used to transmit the antenna signal to other tuners. Each output has its own characteristics (see Table 56 and Table 57) 8.2.1 Loop-through output The gain between the antenna connector and the loop-through pin (pin LT) equals 0 dB. This pin can be connected to any consumer electronic equipment. 8.2.2 Slave tuner output The slave tuner output (pin STO) must be connected to the RF input of the slave tuner TDA18211HD in case of dual-tuner applications. The gain between the antenna connector and the slave tuner output can change according to the input level. The slave tuner will automatically compensate the gain change, using the MASTERSYNC and FREEZE signals. Table 4. Master and slave selection Voltage on pin XTOUT_MS Tuner type Crystal oscillator 0 V to 0.1VCC master negative impedance presented to the crystal 0.4VCC to 0.6VCC slave current input buffer |
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