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參數(shù)資料
| 型號(hào)： | LC72148V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Electronic Tuning PLL Frequency Synthesizer for Car Stereo Systems |
| 中文描述： | 電子調(diào)諧鎖相環(huán)頻率合成器的汽車音響系統(tǒng) |
| 文件頁數(shù)： | 19/21頁 |
| 文件大小： | 170K |
| 代理商： | LC72148V |
No. 6974-19/21
LC72148V
3. Notes on using IF counting with the HCTR/I-6 and LCTR/I-7 pins
If IF counting is used, the microcontroller must test the state of the IF IC SD (station detect) signal, and only if the SD
signal is present, turn on the IF counter buffer output and perform an IF count operation. Methods in which auto-
search operations are implemented only using the IF count may incorrectly stop at frequencies where no station is
present due to leakage from the IF counter buffer.
4. Using the DO pin
At times other than data output mode, the DO pin can also be used to check for general-purpose counter count
operation completion, to output the unlock state detection signal, and to check for changes in the input pins.
Note that the states of the input pins (I/O-1 and I/O-2) can be input to the system microcontroller through the DO pin.
5. Power supply pins
Capacitors must be inserted between the V
DD
and V
SSd
power supply pins to reduce noise. These capacitors must be
located as close to the V
DD
and V
SSd
pins as possible.
6. Notes on VCO design
The VCO (local oscillator) must be designed so that the VCO oscillation does not stop if the control voltage (Vtune)
becomes 0 V. If it is possible for this oscillator to stop, use the charge pump control data (DLC) to forcible set Vtune
to V
CC
temporarily to prevent the PLL circuit from deadlocking. (This function is called a deadlock clear circuit.)
7. Notes on the PD pin
When switching from the LC72146 (5 V system) to this IC (3 V system), the charge pump output voltage will be
reduced, thus reducing the loop gain. Thus various aspects of the circuit, such as the loop filter coefficients, and the
locking time (the SD wait time) must be reviewed.
8. Microcontroller interface
Although this IC is a 3 V system IC, it can accept 5 V system inputs over the microcontroller interface (the CE, DI,
and CL pins).
Pin states after a power-on reset
O: Open, L: Low, F: Floating
State
Power-on reset
O
O-7
L
O-6
F
I-5
F
I-4
F
I-3
F
I-2
F
I-1
State
Power-on reset
F
I-6
F
I-7
XOUT
CE
DI
CL
DO
O-7
O-6
I/O-5
I/O-4
I/O-3
I/O-2
I/O-1
XIN
V
SSa
AOUT
AIN
PD0
PD1
V
SSd
FMIN
AMIN
VDD
HCTR/I-6
LCTR/I-7
LC72148V
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| LC7216M | PLL Frequency Synthesizer for Electronic Tuning |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC72148V-MPB-E | 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Ammo Pack 制造商:ON Semiconductor 功能描述:Phase Locked Loops - PLL |
| LC72148V-TLM-E | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| LC7215 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:MW/LW PLL Frequency Synthesizers |
| LC72151V | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning in Car Audio Systems |
| LC72151VS-MPB-E | 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Ammo Pack |
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