參數(shù)資料
型號(hào)： LC72121V
廠商： Sanyo Electric Co.,Ltd.
英文描述： PLL Frequency Synthesizers for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器)
中文描述： 鎖相環(huán)頻率合成器電子調(diào)諧（用于電子調(diào)諧的鎖相環(huán)頻率合成器）
文件頁(yè)數(shù)： 22/23頁(yè)
文件大?。?/td> 375K
代理商： LC72121V
No. 5815-22/23
LC72121, 72121M, 72121V
DO pin usage
The DO pin can be used for IF counter count completion checking and as an unlock detection output in addition to its
use in data output mode. It is also possible to have the DO pin reflect the state of an input pin to input that state to the
microcontroller.
Power supply pins
Capacitors must be inserted between the power supply V
DD
and V
SS
pins for noise exclusion. These capacitors must be
placed as close as possible to the V
DD
and V
SS
pins.
VCO setup
Applications must be designed so that the VCO (local oscillator) does not stop, even if the control voltage (Vtune) goes
to 0 V. If it is possible for the oscillator to stop, the application must use the control data (DLC) to temporarily force
Vtune to V
CC
to prevent deadlock from occurring. (Deadlock clear circuit)
Front end connection example
Since this product (and the LC72131 as well) is designed with the relatively high resistance of 200 k
for the pull-
down (on) resistors built in to the FMIN and AMIN pins, a common AM/FM local oscillator buffer can be used as
shown in the following circuit.
PD pin
Note that the charge pump output voltage is reduced when this IC, which is a 3-V system, is used to replace the
LC72131, which is a 5-V system. This means that since the loop gain is reduced, the loop filter constants, the lock time
(SD wait time), and other related parameters must be reevaluated in the end product design.
相關(guān)PDF資料
PDF描述
LC72121 PLL Frequency Synthesizers for Electronic Tuning
LC72121M PLL Frequency Synthesizers for Electronic Tuning
LC72122V PLL Frequency Synthesizer for Portable Equipment Electronic Tuning
LC72130 AM/FM PLL Frequency Synthesizers(AM/FM鎖相環(huán)頻率合成器)
LC72131 AM/FM PLL Frequency Synthesizers(AM/FM鎖相環(huán)頻率合成器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC72121V-D-MPB-E 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Ammo Pack
LC72121V-D-TLM-E 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Tape and Reel
LC72121V-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
LC72122V 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Portable Equipment Electronic Tuning
LC72122V-MPB-E 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Ammo Pack
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