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TEA5760UK Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA5760UK Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 37 page TEA5760UK_1 © NXP B.V. 2006. All rights reserved. Product data sheet Rev. 01 — 14 December 2006 6 of 36 NXP Semiconductors TEA5760UK Single chip FM stereo radio where: NDEC = decimal value of PLL word fRF = wanted tuning frequency (Hz) fIF = intermediate frequency (Hz): 225 kHz fref = reference frequency (Hz): 32.768 kHz Example for receiving a channel at 100.1 MHz: The result must always be rounded to the lowest integer value. If rounded down to the lowest integer value of NDEC = 12246, the PLL word becomes 2FD6h. Via the control interface this value can be written to register FRQSET and the TEA5760UK will then start an autonomous search beginning at this frequency or go to a preset channel at this frequency. When the application is built according the application diagram (see Figure 11) and with the preferred components, the tuning system will settle to the new frequency within 40 ms. The PLL is triggered by writing one of the following bytes: FRQSETMSB, FRQSETLSB, TNCTRL1, TNCTRL2, TESTBITS and TESTMODE. Accurate validation of the PLL locking onto the new frequency can take 40 ms. Bit LD in register TUNCHK (see Table 18) is set when a lock is detected. 6.6 Band limits The TEA5760UK can be switched to the Japanese FM band or the US/Europe FM band. With bit BLIM in register TNCTRL (see Table 13) set to logic 0 it enables the US/European FM band (87.5 MHz to 108 MHz), while setting bit BLIM to logic 1 enables the Japanese FM band (76 MHz to 90 MHz). 6.7 RF AGC The RF AGC prevents overloading and limits the amount of intermodulation products created by strong adjacent channels. The default setting for the RF AGC is on and it can be turned off via the control interface. The TEA5760UK also has an inband AGC to prevent overloading by the wanted channel itself. The inband AGC is always on. 6.8 IF filter Fully integrated IF filter with a center frequency of 225 kHz. 6.9 FM demodulator Fully integrated FM quadrature demodulator. N DEC 4 100.e6 225e3 + () × [] 32768 --------------------------------------------------------- 12246.704 == |
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