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参数资料
| 型号： | CX74038-71 |
| 厂商： | SKYWORKS SOLUTIONS INC |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2600 MHz, CQCC24 |
| 封装： | 4.50 X 3.50 MM, 1 MM HEIGHT, CSP-24 |
| 文件页数： | 4/17页 |
| 文件大小： | 988K |
| 代理商： | CX74038-71 |
Data Sheet I CX74038
12
Skyworks Solutions, Inc., Proprietary and Confidential
MARCH 7, 2003
[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
101075F
Table 6. CX74038 Register Descriptions (2 of 2)
Symbol
Function
Description
Register Word Address 01 (continued)
SC1
RF synthesizer charge-pump
output current [4:3]
Bit[4:3] sets 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 Selects 8/9 prescaler
1 Selects 16/17 prescaler
R1
RF synthesizer reference divider
[8:6]
Bit[8:6] sets the RF synthesizer 3-bit reference divider ratio
ME
RF synthesizer modulo extender
[21:9]
Bit[21:9] extends the RF synthesizer’s fractional modulo up
to 2,097,152 (optional)
Register Word Address 10
Address bits [1:0]
10
SP2
IF synthesizer phase detector
output polarity [2]
Bit[2] sets the IF synthesizer phase detector output:
0 Sets phase detector output for negative VCO gain
1 Sets phase detector output for positive VCO gain
EN
Enable mode [4:3]
Bit[4:3] enables the RF and/or IF synthesizers:
bit 4 bit 3
0
Enables both RF SX and IF SX
0
1
Enables only RF SX
1
0
Enables only IF SX
1
Sets power-down mode for both RF/IF SX
N2
IF synthesizer main divider [21:5]
Bit[21:5] sets the IF synthesizer 17-bit main divider ratio
Register Word Address 11
Address bits [1:0]
11
FN
RF synthesizer fractional-N
division [9:2]
Bit[9:2] sets the RF synthesizer fractional-N program up to
256 modulo
N1
RF synthesizer main divider
[21:10]
Bit[21:10] sets the RF synthesizer 12-bit main divider ratio
with a 16/17 prescaler, or an 11-bit main divider ratio with
8/9 prescaler
Note 1: These bits must be programmed after power is applied to the device. Failure to do so may result in
erroneous device operation.
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