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SL6652DP20 Datasheet(PDF) 5 Page - Zarlink Semiconductor Inc |
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SL6652DP20 Datasheet(HTML) 5 Page - Zarlink Semiconductor Inc |
5 / 11 page SL6652 Fig. 3 Internal schematic GENERAL DESCRIPTION The SL6652 is a very low power, high performance integrated circuit intended for IF amplification and demodulation in FM radio receivers. It comprises: q A mixer stage for use up to lOOMHz q An uncommitted transistor for use as an oscillator q A current sink for biasing this transistor q A limiting amplifier operating up to 1.5MHz q A quadrature detector with differential AF output q An RSSI (Received Signal Strength Indicator) output Mixer The mixer is single balanced with an active load. Gain is set externally by the load resistor although the value is normally determined by that required for matching into the ceramic filter. It is possible to use a tuned circuit but an increase in mixer gain will result in a corresponding reduction of the mixer input intercept point. The RF input is a diode-biased transistor with a bias current of typically 300 µA. The oscillator input is differential but would normally be driven single-ended. Special care should be taken to avoid accidental overload of the oscillator input. Oscillator The oscillator consists of an uncommitted transistor and a separate current sink. The user should ensure that the design of oscillator is suitable for the type of crystal and frequency required; it may not always be adequate to duplicate the design shown in this data sheet. IF amplifier The limiting amplifier is capable of operation to at least 1 MHz and the input impedance is set by an external resistor to match the ceramic filter. Because of the high gain, pins 12 and 13 must be adequately bypassed. Detector A conventional quadrature detector is fed internally from the IF amplifier; the quadrature input is fed externally using an appropriate capacitor and phase shift network. A differential output is provided to feed a comparator for digital use, although it can also be used to provide AFC. RSSI output The RSSI output is a current source with value proportional to the logarithm of the IF input signal amplitude. There is a small residual current due to noise within the amplifier (and mixer) but beyond this point there is a measured and guaranteed 70dB dynamic range. The typical range extends to 92dB, independent of frequency, and with exceptionally good temperature and supply voltage stability. 18 16 17 15 9 20 10 19 7 4k 13 14 12 200k 200k 11 5 6 8 3 BAND-GAP REFERENCE 4 2 1 40k 40k BIAS |
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