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參數(shù)資料
| 型號： | PNP-437-P22 |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 250 MHz, QCC22 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 183K |
| 代理商： | PNP-437-P22 |
Attribute Definitions
PNP-437-P22
FIGURE 4: FUNCTION SELECT (DB28 - DB31). After the data in FREQUENCY/CHANNEL (DB0 - DB23)
is multiplied by 10
n where the value of n is determined by the contents of MULTIPLIER (Figure 3), it is then
routed internally to the START, STOP, STEP, REF or CHANNEL registers based on the contents of FUNC-
TION SELECT as shown below.
DB31
DB30
DB29
DB28
FUNCTION SELECT
FS3
FS2
FS1
FS0
0
CHANNEL. Routes data from DB0-DB23 to the CHANNEL REGISTER.
0
1
START. Routes data from DB0-DB23 to the START REGISTER.
0
1
0
STOP. Routes data from DB0-DB23 to the STOP REGISTER.
0
1
STEP. Routes data from DB0-DB23 to the STEP REGISTER.
0
1
0
REFERENCE. Routes data from DB0-DB23 to the REFERENCE REGISTER
All FUNCTION SELECT values not shown above are reserved for factory use.
DBn
DB3
DB2
DB1
DB0
FREQUENCY/CHANNEL
FCn
FC3
FC2
FC1
FC0
0
1
0
1
0
2
0
1
3
0
1
15
DB23
FC23
0
FIGURE 2: FREQUENCY/CHANNEL (DB0 - DB23) This is a 24 bit string used to set the synthesizer’s
START Frequency, STOP Frequency, STEP Frequency, REF Frequency or CHANNEL number.
FIGURE 3: MULTIPLIER (DB24 - DB27) The data in FREQUENCY/CHANNEL (DB0-DB23) is multiplied
by 10
n where the value of n is determined by the contents of MULTIPLIER (DB24-DB27) as shown below.
DB27 DB26 DB25 DB24
MULTIPLIER
M3
M2
M1
M0
0
10
0 X contents of DB0-DB23
0
1
10
1 X contents of DB0-DB23
0
1
0
10
2 X contents of DB0-DB23
0
1
10
3 X contents of DB0-DB23
n
10
n X contents of DB0-DB23
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