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參數(shù)資料
| 型號(hào)： | TRF2050PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數(shù)： | 22/34頁 |
| 文件大?。?/td> | 543K |
| 代理商： | TRF2050PW |
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TRF2050
LOW-VOLTAGE 1.2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER
SLWS030E– JUNE 1996 – REVISED OCTOBER 2000
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
reference divider
The input signal on REFIN is amplified by a single-ended, ac-coupled input buffer/amplifier that has sufficient
sensitivity for direct connection to a typical TCXO. The 12-bit (NR) reference divider total division ratio can be
expressed as:
NTotal = NR, where NR = 4 to 4095
A four-section postscaler is connected to the output of the reference divider section. The main and auxiliary
synthesizer sections can individually select a reference postscaler division of 1, 2, 4, or 8 by programming fields
SM and SA, respectively (see Figure 24).
Divide by NR
÷ 2
SM = “11”
SM = “10”
SM = “01”
SM = “00”
SA = “11”
SA = “10”
SA = “01”
SA = “00”
MAIN SELECT
AUXILIARY SELECT
Main Phase
Detector
Auxiliary
Phase Detector
Reference Input
Figure 24. Reference Divider
phase detectors
The main and auxiliary synthesizer sections (see Figure 25) incorporate dual D-type flip-flop phase-frequency
detectors (PFD). A PFD has gain with a phase error over a range of
±2π and exhibits an infinite pull-in range.
Dead-band compensation about zero-phase error is provided by forcing the sourcing and sinking charge pumps
to have a minimum on-time of 1/fRef when the loop is operating in a locked condition.
The phase detectors can be programmed for polarity sense. Normally, external system VCOs have a positive
slope control-voltage frequency characteristic. Some VCOs have a negative slope characteristic. The TRF2050
main and auxiliary phase detectors can be programmed for use with positive or negative slope VCOs using the
MCP and ACP fields, respectively, in the B-Word (EPM mode).
For positive slope VCOs: MCP = ACP = 0
For negative slope VCOs: MCP = ACP = 1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TRF2052 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-VOLTAGE 2-GHz SYNTHESIZER |
| TRF2052PW | 功能描述:IC LV 2-GHZ SYNTH 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:PLL 頻率合成器 PLL:是 輸入:晶體 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/無 頻率 - 最大:1GHz 除法器/乘法器:是/無 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-LSSOP（0.175"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:NJW1504V-TE1-NDNJW1504V-TE1TR |
| TRF2056 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-VOLTAGE 1,2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER |
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