RED PT500-2, Service Manual

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PT500-2 Service Manual
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54 BUSY P04 I AN3 Busy level input
55 TOPKEY P62 I L TOPKEY input
56 RXMUTE P61 O H RX audio mute
57 RSSI P05 I AN2 Received Signal Strength Indicator input
58 PCTV P06 O DA0 APC/BPF control output
59 AVSS - I GND
60 DTMF P07 O DA1 DTMF/Beep output
61 VREF - I +3V
62 AVCC - I +3V
63 NC P37 O
64 RX_W/N P53 O H RX Wide/Narrow switch
Table 5.4 Functional description of semiconductor device
Item Model Function Description
IC1 MB15E03 Frequency Synthesizer
IC100 NJM2904 APC, Voltage Comparison, Driving
IC200 GT3136 Receiver 2
nd
Local Oscillation, 2
nd
IF Amplification,
Limitation, Demodulation, Noise Amplification
IC300 NJM2902V Receiver demodulated signal Amplification, Filtering
IC500 NJM2100V MIC Amplification, Limitation, Filtering
IC302 TDA2822D Audio Frequency Power Amplification
IC401 W25Q80 FLASH, Channel Frequency Data Storage, Function
Setting Parameter, Debug Mode Parameter
IC403 R5F212BCSNFP MCU
Chapter 6 PT500-2 PCB Layout