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參數(shù)資料
| 型號： | TRF2052PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW-VOLTAGE 2-GHz SYNTHESIZER |
| 中文描述： | 低電壓2 - GHz的合成器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 130K |
| 代理商： | TRF2052PW |
TRF2052
LOW-VOLTAGE 2-GHz SYNTHESIZER
SLWS066 – JULY 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
serial control
The TRF2052 internal registers contain all the user programmable variables such as divider ratios, charge pump
settings, etc. They are programmed using a three-wire (CLOCK, DATA, STROBE) serial interface.
At every rising slope of the CLOCK signal, the actual logical value on the DATA pin is written into a 24-bit shift
register. A rising slope on the STROBE pin causes the actual content of the shift register to be input as a control
word.
The control word is, therefore, 24-bits long and the first incoming bit functions as the least significant bit (LSB),
bit 0. If the most significant bit (MSB), bit 23, is 1, the word functions as control word A. If the MSB is 0, bits 20
to 22 become address bits, which label the words as control word B through E, respectively. To fully program
the synthesizer, four words must be sent: A, B, C, and D. Word E is for test purposes only.
The position of the individual variables within the control words is illustrated in Figure 2. Table 1 briefly describes
their functions. The G parameter, which specifies the duration of the speed-up mode in reference divider cycles,
splits into most significant (G2) and least significant (G1) nibbles.
0
G1
N
1 0 0 0
CN
CK
CL
M
C
P
1 0 0 1
NA
1 0 1 0
NR
SM
SA
1 1 1 1
MSB
Last In
LSB
First In
A
B
C
D
E
E
M
E
A
TST<10:0>
23 22 21 20 1918 17 16 15 14 13 12 11 10 9 8
7
6 5
4 3
2 1
nc
G2
A
C
P
P
A
nc
E
S
P
M
nc
Figure 2. Serial Word Format
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