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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TEA5777HN 데이터시트(PDF) 10 Page - NXP Semiconductors |
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TEA5777HN 데이터시트(HTML) 10 Page - NXP Semiconductors |
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10 / 48 page  TEA5777_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 11 April 2006 9 of 47 Philips Semiconductors TEA5777 Low-power AM/FM stereo radio for handheld applications 8. Functional description The TEA5777 is an integrated AM/FM stereo radio circuit with very high integration level including digital tuning and control functions. The IC communicates with a microcontroller via the I2C-bus or the 3-wire bus interface and provides the following functions: • AM single conversion receiver with integrated image rejection for fIF =21kHz • FM single conversion receiver with integrated image rejection for fIF = 133.333 kHz or 150 kHz (software selectable) • FM stereo decoder with signal dependent stereo effect The AM circuit incorporates: • Integrated antenna tuning function • Integrated I/Q IF channel • On-chip image reject mixer structure • A fully integrated AM VCO with fVCO = 8 × (fRF + fIF) • Software selectable high-side or low-side oscillator injection • A fully integrated AM detector The FM circuit incorporates: • Integrated I/Q IF channel • On-chip image reject mixer structure • External RF VCO running at fVCO = 2 × (fRF ± fIF) • Software selectable high-side or low-side oscillator injection • A fully integrated demodulator • Japan band possibility The stereo decoder incorporates: • A 1.52 MHz VCO, that needs no external adjustment, which can lock to the 19 kHz stereo pilot tone by means of a PLL system; the sub-carrier frequencies of 19 kHz, 38 kHz and others are regenerated from the VCO output • Integrated 50 µs or 75 µs (switchable) de-emphasis • Signal Dependent Stereo (SDS) function can be switched off via the bus interface • Stereo decoder can be switched off in order to save power Tuning function: • The tuning synthesizer is on-chip with the radio and utilizes a PLL system for tuning and an IF counter has been added for search-stop detection • Tuning to a wanted input signal can be achieved by preset tuning or search tuning. For the latter the IC has a built-in auto search function which reduces the load of the microcontroller |
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