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TDA8263HN Datenblatt(PDF) 7 Page - NXP Semiconductors |
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TDA8263HN Datenblatt(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 9397 750 13193 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Product data sheet Rev. 01 — 14 December 2004 7 of 28 Philips Semiconductors TDA8263HN Fully integrated satellite tuner The internal loop controls a fully integrated VCO, to cover the range from 950 MHz to 2175 MHz. This VCO provides both in phase and quadrature signals to drive the two mixers. The output of the 15-bit programmable divider passes through the phase comparator where it is compared in both phase and frequency to the comparison frequency (fcomp). This fcomp is derived from the signal present at the XT/XTN pins (fXTAL), divided down in the reference divider. The buffered signal on pin XTOUT is able to drive the crystal frequency input of the SDD, which saves a crystal in the application. The output of the phase comparator drives the charge pump and loop amplifier section. Pin CP is the output of the charge pump, and pin VT drives the tuning voltage to the varicap diode of the voltage controlled oscillator. The loop filter has to be connected between pins CP and VT. For test and alignment purposes, it is possible to release the tuning voltage output and to apply an external voltage on the VT pin, as well as to select the charge pump sink, source or off. 10.1 Gain distribution 11. Programming The programming of the TDA8263HN is done through the I2C-bus. The READ/WRITE selection is done through the R/W bit (address LSB). The TDA8263HN fulfils the fast mode I2C-bus specification, according to the Philips I2C-bus specification, see document 9398 393 40011. 11.1 I2C-bus inputs The I2C-bus lines SCL and SDA can be connected to an I2C-bus system tied to either 3.3 V or 5.0 V, which allows direct connection to most of existing microcontrollers. Data transfer format should be MSB first, and 8-bit word + acknowledge bit. Fig 4. Gain distribution; typical values 10.2 dB 001aaa977 AGC LNA /ATT AGC RFATT BBGAIN [3:0] 24 dB −37 dB 12 dB −8 dB 9 dB 10.2 dB 10.2 dB |
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