- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44574 > LMX2355SLBX (NATIONAL SEMICONDUCTOR CORP) PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 PDF資料下載
參數(shù)資料
| 型號(hào)： | LMX2355SLBX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| 封裝： | PLASTIC, CSP-24 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LMX2355SLBX |
Programming Description (Continued)
4.1.3 15-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER)
(IF_R[2]–IF_R[16])
IF_R_CNTR/RF_R_CNTR
Divide
Ratio
14
13
12
11
10
987654321
0
3
00000000000001
1
4
00000000000010
0
32,767
11111111111111
1
Notes: Divide ratio: 3 to 32,767 (Divide ratios less than 3 are prohibited).
RF_R_CNTR/IF_R_CNTR These bits select the divide ratio of the programmable reference dividers.
4.1.4 IF_CP_WORD
(IF_R[17]–IF_R[18])
CP_GAIN_8
IF_PD_POL
BIT
LOCATION
FUNCTION
0
1
CP_GAIN_8
IF_R [18]
IF Charge Pump
Current Gain
1X
8X
IF_PD_POL
IF_R [17]
IF Phase Detector
Polarity
Negative
Positive
CP_GAIN_8 is used to toggle the IF charge pump current magnitude between 1X mode (100 A typical) and 8X mode (800 A
typical).
IF_PD_POL is set to one when IF VCO characteristics are positive. When IF VCO frequency decreases with increasing control
voltage IF_PD_POL should set to 0.
4.1.5 FoLD* Programming Truth Table
(IF_R[19]–IF_R[21])
FoLD
Fo/LD OUTPUT STATE
0 0 0
IF and RF Analog Lock Detect
1 0 0
IF Digital Lock Detect
0 1 0
RF Digital Lock Detect
1 1 0
IF and RF Digital Lock Detect
0 0 1
IF R counter
1 0 1
IF N counter
0 1 1
RF R counter
1 1 1
RF N counter
*FoLD - Fout/Lock Detect PROGRAMMING BITS
4.2 RF_R Register
If the Control Bits (CTL [1:0]) are 1 0, data is transferred from the 24-bit shift register into the RF_R register latch which sets the
RF PLL’s 15-bit R counter divide ratio. The divide ratio is programmed using the RF_R_CNTR word as shown in table 4.1.3. The
divide ratio must be
≥ 3. The bits used to control the voltage doubler (V2_EN) and RF Charge Pump (RF_CP_WORD) are
detailed in 4.2.2.
MSB
LSB
DLL_MODE
V2_EN
RF_CP_WORD [4:0]
RF_R_CNTR [14:0]
1
0
23
22 21
17 16
2 1
0
LMX2354
www.national.com
14
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMX2370SLDX | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| LMX2370TMX/NOPB | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| LMX2370TM/NOPB | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| LMX2512LQX0967/NOPB | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| LMX2515LQX0701/NOPB | PLL FREQUENCY SYNTHESIZER, 26 MHz, QCC28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2355TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2360 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2360TMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LMX2364 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
| LMX2364EVAL | 功能描述:BOARD EVALUATION LMX2364 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。