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TEF6901A Datasheet(PDF) 9 Page - NXP Semiconductors |
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TEF6901A Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 107 page  TEF6901A_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 20 March 2008 9 of 107 NXP Semiconductors TEF6901A Integrated car radio 7.12 Antenna DAA For FM operation the antenna Digital Auto Alignment (DAA) measures the VCO tuning voltage and multiplies it with a factor defined by the 7-bit DAA setting to generate a tuning voltage for the FM antenna tank circuit (RF selectivity). In AM mode the DAA setting controls a fixed voltage. 7.13 AM RF AGC control The AM front-end is designed for the application of an external Junction Field Effect Transistor (JFET) low noise amplifier with cascode AGC and PIN diode AGC both controlled by an integrated AGC control circuit. Four AGC thresholds of the detector at the first mixer input are selectable via I2C-bus. Detectors at the RF mixer input and at the AMIF2 input prevent undesired overload (see Figure 40). AGC information can be read out via I2C-bus. The PIN diode current drive circuit includes a pull-up current source for reverse biasing of the PIN diode, when the AGC is not active to achieve a low parasitic capacitance. 7.14 AM mixer 1 The large dynamic range AM mixer converts AM RF (144 kHz to 26.1 MHz) to an IF frequency of 10.7 MHz. 7.15 AM IF noise blanker The spike detection for the AM IF noise blanker is at the output of the AM front-end mixer. Blanking is realized at the second AM mixer. 7.16 AM IF AGC amplifier and demodulator The 450 kHz IF2 signal after the ceramic channel selection filter is amplified by the IF AGC amplifier and demodulated. 7.17 AM level detection The IF2 signal used for AM IF AGC and demodulation is also used in the limiter circuit for in-band level detection. 7.18 AM and FM level DAA The start and slope of the level detector output are programmable to achieve level information independent of gain spread in the signal channel. 7.19 AM and FM IF counter The output signal from the limiter is used for IF counting in both AM and FM. 7.20 Tuning mute A soft slope tuning mute is controlled by the sequential machine for different tuning actions to eliminate audible effects of tuning and band switching. |
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