參數(shù)資料
型號(hào)： UPD178024GC-051
廠(chǎng)商： NEC Corp.
元件分類(lèi)： 通用總線(xiàn)功能
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO WITH CD PLAYER
中文描述： 8位單片機(jī)具有片上標(biāo)器，鎖相環(huán)頻率合成器，如柜臺(tái)，汽車(chē)調(diào)頻/中波/龍運(yùn)收音機(jī)帶CD播放器
文件頁(yè)數(shù)： 10/98頁(yè)
文件大小： 467K
代理商： UPD178024GC-051
Data Sheet U14608EJ1V0DS00
10
μ
PD178024GC-051
Pin No.
Symbol
Pin Name
Description
I/O Type
31
VCOH
FM local oscillation
input
This pin inputs the local oscillation output (VCO) of the FM band.
Because it is connected to an internal AC amplifier, connect a
capacitor to this pin in series to cut off the DC component.
The voltage on this pin is at the intermediate level (about 1/2V
DD
)
during auto tuning of the FM band, but at all other times the pin
goes into a high-impedance state.
Input
32
VCOL
AM local oscillation
input
This pin inputs the local oscillation output (VCO) of the AM band
(MW, LW).
Because it is connected to an internal AC amplifier, connect a
capacitor to this pin in series to cut off the DC component.
The voltage on this pin is at the intermediate level (about 1/2V
DD
)
during auto tuning of the AM band (MW, LW), but at all other times
the pin goes into a high-impedance state.
Input
33
GNDPLL
PLL ground
Ground pin for PLL.
Connect this pin to the GND pin.
34
35
EO0
EO1
Error out
These pins are the output pins of the charge pump of the phase
comparator that constitutes the PLL.
Input the output signals from these pins to an external LPF (Low
Pass Filter), and apply them to a varacter diode via the LPF.
If the divided local oscillation frequency (VCO output) is higher than
the reference frequency, these pins output a high level; if this
frequency is lower than the reference frequency, they output a low
level.
If the frequency matches, these pins are floated.
CMOS
3-state
output
36
IC
Internally
connected
This pin is internally connected.
Directly connect this pin to the GND pin with as short a wiring length
as possible.
If noise is superimposed on this pin, it may cause the device to
malfunction.
37
LOC
Local signal output
This pin outputs the local signal of the radio.
This pin outputs a high level during auto tuning in the local mode.
At all other times, it outputs a low level.
CMOS
push-pull
output
This pin inputs a stereo signal.
Input a signal to this pin as follows:
STEREO Pin
Description
0
Stereo broadcasting being received
1
Stereo broadcasting not received
(0: Low level, 1: High level)
38
STEREO
Stereo signal input
The stereo signal is ignored unless the FM band is being received.
Input
Outputs a loudness signal.
This pin outputs a signal as follows in the power-on status,
depending on the loudness status.
LOUD Pin
Loudness Status
0
Loudness on
1
Loudness off
(0: Low level, 1: High level)
39
LOUD
Loudness signal
output
At all other times, this pin outputs a high level.
CMOS
push-pull
output
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