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參數(shù)資料
| 型號： | MLS9900-01035 |
| 英文描述： | Surface Mount Frequency Synthesizer DATA 10051065 MHz |
| 中文描述： | 表面貼裝頻率合成器數(shù)據(jù)10051065兆赫 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 128K |
| 代理商： | MLS9900-01035 |
Surface Mount Frequency Synthesizer
MLS9900-01035
V1.00
M/A-COM Ltd.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
I
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
I
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
4
This Preliminary Specifications Data Sheet Contains Typical Electrical Specifications Which May Change Prior to Final Introduction.
For example with a 19.2 MHz reference frequency, to set
the output frequency to 1035 MHz with a 12.5 kHz step
size the following data words are required.
Prescalar range = 128, therefore S = 0
Therefore the reference word is
0
S
00011000000000
R13 ................R0
1
Control bit
M = Integer of
A =
Therefore the frequency word is
01010000110
M10 ....... M0
1110000
A6.....A0
0
Control bit
Once the reference word has been sent, only the 19 bit
frequency word need be sent to change the output
frequency if the reference and step size remain constant.
Data
Clock
Strobe
Tw
Ts
Th
To
Tw
Ref:
Freq:
M10
S
M9
R13
M8
R12
A0
R0
0
1
Set-up time (Ts), Hold time (Th), Clock and Strobe pulsewidths (Tw) and Strobe offset time (To) all to be greater than 100 nanosec.
1035
125
646
1010000110
x 10
x 10
x
1
128
binary
6
3
.
=
=
1035
125
646
x 10
x 10
x
1
128
x 128 =112 = 1110000 binary
6
3
.
Timing Diagram
Programming Information
The output frequency of the synthesizer is serially
programmed using the data input by sending a 16 bit
reference word and a 19 bit frequency word with the
clock input. Each word is followed by a strobe input
pulse which must occur while the clock input is low.
The data input timing is shown below.
The 16 bit reference word sends the prescalar range (S)
(S = 0 for the prescalar range of 128 used), the reference
division ratio (R) as a 14 bit binary number and a control
bit. The 19 bit frequency word sends the number of
prescalar division cycles (M) as an 11 bit binary number,
the number of P + 1 divisions (A) as a 7 bit binary
number and a control bit. Where:
M = Integer of
A =
and R, M and A are all integers with M
≥
A.
The output frequency is then determined by the
following formula:
R =F
F
R
F
F
x
out
1
128
F
F
x
1
128
M x128
out
Fout = 128xM
A xF
R
R
+
R =F
F
x 10
x 10
binary
R
6
3
=
=
=
19 2
12 5
1536
11000000000
.
.
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