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UPD1723GF-211-3KE Datasheet(PDF) 5 Page - NEC |
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UPD1723GF-211-3KE Datasheet(HTML) 5 Page - NEC |
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5 / 80 page  5 µPD1723GF-013, µPD1723GF-213 PIN DESCRIPTIONS OUTPUT TYPE This pin is not connected to the internal chip. There- fore, leave it open or connect it to GND, VDD, etc. PLL (Phase Locked Loop) error output pins. When the frequency obtained by dividing the local oscillation frequency (VCO output) is higher than the reference frequency, High level is output from these pins. When it is lower than the reference frequency, Low level is output from these pins. When the two fre- quencies are the same, these pins are floated. This output is input to an external LPF (Low Pass Filter) and is applied to a varactor diode through the LPF. EO1 and EO2 output the same waveform so that the pin to be used can be freely selected. When the radio is OFF, these pins are floated. Device power supply input pin. This pin supplies 5 V ±10 % power voltage during device operation (radio, tape, and CD modes). When the diode matrix NOCLK switch is 1 (shorted by diode), when the CE pin (pin 7) is made Low level, this pin drops to 2.5 V and data hold is enabled. When a voltage of 0 → 4.5 V is supplied to this pin, the data is initialized. Supply 0 → 4.5 V to this pin within 500 ms. Always connect pins 4 and 8 to the same potential. VDD1 (pin 4) is the analog system (PLL, A/D converter, INT, CE) power supply and VDD2 (pin 8) is the digital system (CPU, LCD driver, IF counter) power supply. The AM (MW and LW band) local oscillation output (VCO output) is input to this pin. When the radio is turned on and the MW or LW band is received, this pin becomes active. Otherwise, it is pulled down internally. The input amplitude is 0.3 VP-P MIN. Since there is an on-chip AC amplifier, block the DC component with a capacitor. DESCRIPTION PIN NAME SYMBOL PIN No. AM AM local oscillation input 5 No connection NC 1 2 3 EO1 EO2 4 8 Power supply input VDD1 VDD2 — CMOS 3-state — Input Error out |
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