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參數資料
| 型號： | CX74038-21 |
| 廠商： | SKYWORKS SOLUTIONS INC |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2600 MHz, PDSO20 |
| 封裝： | 6.5 X 4.4 MM, 1 MM HEIGHT, TSSOP-20 |
| 文件頁數： | 12/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | CX74038-21 |
DATA SHEET CX74038 FREQUENCY SYNTHESIZER
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
101075J Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice August 29, 2005
9
Table 5. CX74038 Register Descriptions (1 of 2)
Symbol
Function
Description
Register Word Address 00
Address bits [1:0]
00
SC2
IF synthesizer charge-pump output current
[3:2]
Bits [3:2] select the IF synthesizer charge pump output current:
bit 3
bit 2
0
Selects 0.4 mA charge pump output current
0
1
Selects 0.8 mA charge pump output current
1
0
Selects 1.2 mA charge pump output current
1
Selects 1.6 mA charge pump output current
LD
Test mode [6:4]
Bits [6:4] set the test mode:
bit 6
bit 5 bit 4
0
multiplexes Ndiv output of IF SX to LD output
0
1
multiplexes Rdiv output of IF SX to LD output
0
1
0
multiplexes lock detect output of IF SX to LD output
0
1
multiplexes ANDed lock detect of both SX to LD output
1
0
multiplexes Ndiv output of RF SX to LD output
1
0
1
multiplexes Rdiv output of RF SX to LD output
1
0
multiplexes lock detect output of RF SX to LD output
1
Hi-Zs the charge-pump output of RF SX
R2
IF synthesizer reference divider [19:7]
Bits [19:7] set the IF synthesizer 13-bit reference divider ratio
RF synthesizer fractional-N mode selection
[21:20] (Note 1)
Bits [21:20] set the RF synthesizer fractional-N mode:
bit 21 bit 20
0
Reserved
0
1
Reserved
1
0
Fractional-N mode with dithering
1
Fractional-N mode without dithering
Register Word Address 01
Address bits [1:0]
01
SP1
RF synthesizer phase detector output
polarity [2]
Bit [2] sets the polarity of the RF synthesizer phase detector output:
0 Sets phase detector output for negative VCO gain
1 Sets phase detector output for positive VCO gain
SC1
RF synthesizer charge-pump output current
[4:3]
Bits [4:3] set the RF synthesizer charge pump output current:
bit 4
bit 3
0
Selects 120
A charge pump output current
0
1
Selects 240
A charge pump output current
1
0
Selects 360
A charge pump output current
1
Selects 480
A charge pump output current
PS
RF synthesizer prescaler selection [5]
Bit [5] selects the RF synthesizer prescaler:
0 Select 8/9 prescaler
1 Select 16/17 prescaler
R1
RF synthesizer reference divider [8:6]
Bits [8:6] set the RF synthesizer’s 3-bit reference divider ratio
ME
RF synthesizer modulo extender [21:9]
Bits [21:9] extend the RF synthesizer’s fractional modulo up to 2,097,152 (optional)
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