TEA5767 Просмотр технического описания (PDF) - NXP Semiconductors.

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TEA5767

Low-power FM stereo radio for handheld applications

NXP Semiconductors. 

NXP Semiconductors

TEA5767HN

Low-power FM stereo radio for handheld applications

7.4 Crystal oscillator

The crystal oscillator can operate with a 32.768 kHz clock crystal or a 13 MHz crystal. The

temperature drift of standard 32.768 kHz clock crystals limits the operational temperature

range from −10 °C to +60 °C.

The PLL synthesizer can be clocked externally with a 32.768 kHz, a 6.5 MHz or a 13 MHz

signal via pin XTAL2.

The crystal oscillator generates the reference frequency for:

• The reference frequency divider for the synthesizer PLL

• The timing for the IF counter

• The free-running frequency adjustment of the stereo decoder VCO

• The center frequency adjustment of the IF filters

7.5 PLL tuning system

The PLL synthesizer tuning system is suitable to operate with a 32.768 kHz or a 13 MHz

reference frequency generated by the crystal oscillator or applied to the IC from an

external source. The synthesizer can also be clocked via pin XTAL2 at 6.5 MHz. The PLL

tuning system can perform an autonomous search tuning function.

7.6 RF AGC

The RF AGC prevents overloading and limits the amount of intermodulation products

created by strong adjacent channels.

7.7 IF filter

Fully integrated IF filter.

7.8 FM demodulator

The FM quadrature demodulator has an integrated resonator to perform the phase shift of

the IF signal.

7.9 Level voltage generator and analog-to-digital converter

The FM IF analog level voltage is converted to 4 bits digital data and output via the bus.

7.10 IF counter

The IF counter outputs a 7-bit count result via the bus.

7.11 Soft mute

The low-pass filtered level voltage drives the soft mute attenuator at low RF input levels.

The soft mute function can be switched off via the bus.

7.12 MPX decoder

The PLL stereo decoder is adjustment-free. The stereo decoder can be switched to mono

via the bus.

TEA5767HN_5

Product data sheet

Rev. 05 — 26 January 2007

© NXP B.V. 2007. All rights reserved.

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