- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98001 > LMX2364TMX/NOPB (NATIONAL SEMICONDUCTOR CORP) PLL FREQUENCY SYNTHESIZER, 2600 MHz, PDSO24 PDF資料下載
參數(shù)資料
| 型號： | LMX2364TMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2600 MHz, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 19/39頁 |
| 文件大?。?/td> | 694K |
| 代理商： | LMX2364TMX/NOPB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁
Programming Description (Continued)
2.4 R1 REGISTER
This register is used to configure the N divider for the IF synthesizer. A single word write to this register is all that is required to
power up and tune the synthesizer to the desired frequency.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
DATA[20:0]
C2
C1
C0
R1
IF_
PD
0
IF_N[16:0]
0
1
2.4.1 IF_N[16:0] — N Divider Ratio,IF Synthesizer
The IF_N[16:0] word is used to setup up the N Divider Ratio for the IF synthesizer. The IF N counter is actually a combination of
an IF A counter, IF B counter, and an IF 8/9 prescaler. The relationship between IF_N, IF_B, and IF_A is shown below.
IF_N=8x IF_B + IF_A
Although the IF_N counter value can created by programming the IF_B and IF_A values, it is easier to simply convert the IF N
counter value into binary and program the entire IF_N[16:0] word in this manner. The fact that the IF N counter has a prescaler
is what puts restrictions on IF_N values less than 56.
IF_N[16:0]
IF_B[13:0]
IF_A[2:0]
16
15
14
13
12
11
10
9876543
2
1
0
0-23
Divide ratios of less than 24 are not allowed.
24-55
Legal divide ratios in this range are: 24-27, 32-36, 40-45, and 48-54.
56
00000
0
0000111
0
57
00000
0
0000111
0
1
...
131071
11111
1
1111111
1
2.4.2 IF_PD — Power Down, IF Synthesizer
Activation of the IF Synthesizer power down bit results in the disabling of the respective N divider and de-biasing of its respective
Fin inputs (to a high impedance state). The respective R divider functionality also becomes disabled when the power down bit is
activated. The OSCinIF pin reverts to a high impedance state when both RF and IF power down bits are asserted. Power down
forces the respective charge pump and phase comparator logic to a TRI-STATE condition. The MICROWIRE control register
remains active and capable of loading and latching in data during all of the power down modes.
Both synchronous and asynchronous power down modes are supported. The power down mode bit R6[8] is used to select
between synchronous and asynchronous power down. The MICROWIRE control register remains active and capable of loading
and latching in data in either power down mode.
Synchronous Power Down Mode: The IF synthesizer can be synchronously powered down by first setting the power down
mode bit HIGH (R6[8] = 1) and then asserting its power down bit (R1[23] = 1). The power down function is gated by the charge
pump. Once the power down bit is loaded, the part will go into power down mode upon the completion of a charge pump pulse
event.
Asynchronous Power Down Mode: The IF synthesizer can be asynchronously powered down by first setting the power down
mode bit LOW (R6[8] = 0) and then asserting its power down bit (R1[23]] = 1). The power down function is NOT gated by the
charge pump. Once the power down bit is loaded, the part will go into power down mode immediately
LMX2364
www.national.com
26
相關PDF資料 |
PDF描述 |
|---|---|
| LMX2372MDC | PLL FREQUENCY SYNTHESIZER, 1200 MHz, UUC |
| LMX2531LQ1500EX | PLL FREQUENCY SYNTHESIZER, 80 MHz, QCC36 |
| LMZ12003EXTTZX | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PSSO7 |
| LMZ12003EXTTZ | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PSSO7 |
| LMZ12003EXTTZE | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PSSO7 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2370 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2370SLBX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP 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:* |
| LMX2370SLDX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP 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:* |
| LMX2370TM | 功能描述:IC FREQ SYNTH DL 2.5GHZ 20TSSOP 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:* |
| LMX2370TMX | 功能描述:IC FREQ SYNTH DL 2.5GHZ 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:* |
發(fā)布緊急采購，3分鐘左右您將得到回復。