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參數(shù)資料
| 型號： | LMX2316TMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO16 |
| 封裝： | 0.173 INCH, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 2/19頁 |
| 文件大小： | 342K |
| 代理商： | LMX2316TMX/NOPB |
1.0 Functional Description (Continued)
1.3.1 Powerdown Operation
Bits F[2] and F[18] provide programmable powerdown modes when the CE pin is HIGH. When CE is LOW, the part is always
immediately disabled regardless of powerdown bit status. Refer to Table 3.
Synchronous and asynchronous powerdown modes are both available by MICROWIRE selection. Synchronous powerdown
occurs if the F[18] bit (Powerdown Mode) is HIGH when F[2] bit (Powerdown) becomes HIGH. Asynchronous powerdown occurs
if the F[18] bit is LOW when its F[2] bit becomes HIGH.
In the synchronous powerdown mode (F[18] = HIGH), the powerdown function is gated by the charge pump to prevent unwanted
frequency jumps. Once the powerdown program bit F[2] is loaded, the part will go into powerdown mode after the first successive
charge pump event.
In the asynchronous powerdown mode (F[18] = LOW), the device powers down immediately after latching LOW data into bit F[2].
The device returns to an actively powered up condition in either synchronous or asynchronous mode immediately upon LE
latching LOW data into bit F[2].
Activation of a powerdown condition in either synchronous or asynchronous mode including CE pin activated powerdown has the
following effects:
Removes all active DC current paths.
Forces the R, N, and timeout counters to their load state conditions.
Will TRI-STATE the charge pump.
Resets the digital lock detect circuitry.
Debiases the f
IN input to a high impedance state.
Disables the oscillator input buffer circuitry.
The MICROWIRE control register remains active and capable of loading the data.
TABLE 3. Power Down Truth Table
CE(Pin 10)
F[2]
F[18]
Mode
LOW
X
Asynchronous Power Down
HIGH
0
X
Normal Operation
HIGH
1
0
Asynchronous Power Down
HIGH
1
Synchronous Power Down
TABLE 4. The Fo/LD (pin 14) Output Truth Table
F[3]
F[4]
F[5]
Fo/LD Output State
0
TRI-STATE
0
1
R Divider Output (fr)
0
1
0
N Divider Output (fp)
0
1
Serial Data Output
1
0
Digital Lock Detect (See 1.3.2 LOCK DETECT OUTPUT Section)
1
0
1
n Channel Open Drain Lock Detect (See 1.3.2 LOCK DETECT OUTPUT
Section)
1
0
Active HIGH
1
Active LOW
1.3.2 Lock Detect Output Characteristics
Output provided to indicate when the VCO frequency is in “l(fā)ock.” When the loop is locked and the open drain lock detect mode
is selected, the pin’s output is HIGH, with narrow pulses LOW. When digital lock detect is selected, the output will be HIGH when
the absolute phase error is < 15 ns for three or five consecutive phase frequency detector reference cycles, depending on the
value of R[19]. Once lock is detected the output stays HIGH unless the absolute phase error exceeds 30 ns for a single reference
cycle. Setting the charge pump to TRI-STATE or power down (bits F2, F18) will reset the digital lock detect to the unlocked state.
The LD precision bit, R[19], will select five consecutive reference cycles, instead of three, for entering the locked state when R[19]
= HIGH.
LMX2306/LMX2316/LMX2326
www.national.com
10
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相關代理商/技術參數(shù) |
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|---|---|
| LMX2320 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Frequency Synthesizer for RF Personal Communications |
| LMX2320 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2320TM | 功能描述:IC FREQ SYNTH 2.0GHZ 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2320TMX | 功能描述:IC FREQ SYNTH 2.0GHZ 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2322 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinumTM 2.0 GHz Frequency Synthesizer for RF Personal Communications |
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