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MC13109A Datasheet(PDF) 13 Page - Motorola, Inc |
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MC13109A Datasheet(HTML) 13 Page - Motorola, Inc |
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13 / 28 page  MC13109A 13 MOTOROLA RF/IF DEVICE DATA PIN FUNCTION DESCRIPTION (continued) 48–TQFP Pin 52–QFP Pin Symbol Type Description 29 32 Lim In Input Signal input for IF amplifier/limiter. 30 33 Gnd RF Gnd Ground pin for RF section of the IC. 31 34 Mix2 Out Output Second mixer output. 32 35 Mix2 In Input Second mixer input. 33 36 VB – Internal half supply analog ground reference. 34 37 Mix1 Out Output First mixer output. 35 38 Mix1 In2 Input Negative polarity first mixer input. 36 39 Mix1 In1 Input Positive polarity first mixer input. 37 38 40 41 LO1 In LO1 Out – Tank elements for 1st LO multivibrator oscillator are connected to these pins. 39 42 Vcap Ctrl – 1st LO varactor control pin. 40 43 Gnd Audio Gnd Ground for audio section of the IC. 41 44 Tx In Input Tx path input to Microphone Amplifier (ac coupled). 42 45 Amp Out Output Microphone amplifier output. 43 46 C In Input Compressor input (ac coupled). 44 47 C Cap – Compressor rectifier filter capacitor pin. Connect capacitor to VCC. 45 48 Lim Out Output Tx path limiter output. 46 49 Spl Amp In Input Splatter amplifier input (ac coupled). 47 50 Tx Out Output Tx path audio output. 48 51 Ref Input Reference voltage input for low battery detect. N/A 52 N/A – Not used. Power Supply Voltage This circuit is used in a cordless telephone handset and base unit. The handset is battery powered and can operate on two or three NiCad cells or on 5.0 V power. PLL Frequency Synthesizer General Description Figure 4 shows a simplified block diagram of the programmable universal dual phase locked loop (PLL). This dual PLL is fully programmable through the MCU serial interface and supports most country channel frequencies including USA (25 ch), France, Spain, Australia, Korea, New Zealand, U.K., Netherlands and China (see channel frequency tables in Appendix A). The 2nd local oscillator and reference divider provide the reference frequency for the Rx and Tx PLL loops. The programmed divider value for the reference divider is selected based on the crystal frequency and the desired Rx and Tx reference frequency values. Additional divide by 25 and divide by 4 blocks are provided to allow for generation of the 1.0 kHz and 6.25 kHz reference frequencies required for the U.K. The 14–Bit Tx counter is programmed for the desired transmit channel frequency. The 14–Bit Rx counter is programmed for the desired first local oscillator frequency. All counters power up in the proper default state for USA channel #6 and for a 10.24 MHz reference frequency crystal. Internal fixed capacitors can be connected to the tank circuit of the 1st LO through microprocessor control to extend the sensitivity of the 1st LO for U.S. 25 channel operation. |
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