- 您现在的位置：买卖IC网 > PDF目录67720 > IMISM532AXB (CYPRESS SEMICONDUCTOR CORP) OTHER CLOCK GENERATOR, PDSO16 PDF资料下载
参数资料
| 型号： | IMISM532AXB |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | OTHER CLOCK GENERATOR, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 3/14页 |
| 文件大小： | 132K |
| 代理商： | IMISM532AXB |
+/+
YJGP VKOKPI KU ETKVKECN
SM532
Approved Product
Low EMI Sprectum Spread Clock
International Microcircuits,Inc.
8/31/98
525 Los Coches St., Milpitas, 95035 408-263-6300, FAX 408-263-6571
Rev. 1.4
http:/www.imicorp.com
Page 11 of 14
Modulation Profile
The SM532 moves from max. to min. frequencies of its bandwidth at a pre-determined rate and profile. The
modulation frequency is determined by the input frequency and an internal divider.
All 3 operating ranges
modulate the Fout clock at from 20 to 40 kHz. The three operating ranges are 14 - 30 MHz, 30 - 60 MHz and 60
to 120 MHz. If OSCin = 15 MHz, the modulation rate is 20 kHz. If OSCin is 60 MHz, in mid-range, the modulation
rate would be 40 kHz. To provide the proper modulation rate the input reference frequency is divided by a fixed
number in each range.
The input reference frequency is divided by 750 in Low Range, 1500 in Mid Range and
3000 in the High Range. From these numbers, the modulation rate can be determined for any input frequency.
Example:
OSCin = 45.378 MHz, Input Range = Mid, Input divisor = 1500
Fmod = OSCin /1500
Fmod = 30.252 kHz
If you have a clock frequency that was on the boundary of the Mid-range and the High range of operation, the
choice of selecting which range to use would be determined by which modulation rate is desired. If you choose
the Mid-range, the modulation rate would be 40 kHz, while choosing the High range would yield a 20 kHz
modulation rate. There is some operational overlap between ranges, such that 58 MHz in the Mid-Range would
give the same results as 58 MHz in the High-Range, except for the modulation rate. This type of operation is not
recommended unless it is thoroughly tested.
The modulation profile of the SM532 is not a linear sweep from max to min and back. The OSCin reference clock
determines the modulation frequency but the internal SSCG control logic determines the actual modulation profile.
The modulation profile can best be described by comparing the instantaneous frequency at Fout with time. The
illustration in figure 9 below is a representation of the modulation profile of the SM532 as displayed on a Time
Domain Analyzer.
Figure 8. Frequency Profile in Time Domain
50.000
50.156
50.312
50.468
50.625
49.844
49.687
49.531
Time (microseconds)
Fout
Freq.
(MHz)
+1.25%
2.5%
-1.25%
0
5
10
15
20
25
30
35
Fmax
Fcenter
Fmin
49.375
相关PDF资料 |
PDF描述 |
|---|---|
| IMSA113-J20S | ACTIVE DELAY LINE, PQCC44 |
| IMSB419-4 | SPECIALTY MICROPROCESSOR CIRCUIT, XMA16 |
| IMSC011-E20S | 1 CHANNEL(S), 20M bps, SERIAL COMM CONTROLLER, PDSO28 |
| IMSC011-P20S | 1 CHANNEL(S), 20M bps, SERIAL COMM CONTROLLER, PDIP28 |
| IMSC011-W20S | 1 CHANNEL(S), 20M bps, SERIAL COMM CONTROLLER, CQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IMISM532AXBT | 制造商:Cypress Semiconductor 功能描述: |
| IMISM560BSZ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| IMISM560BZ | 制造商:Cypress Semiconductor 功能描述:PLL Frequency Synthesizer Single 25MHz to 108MHz 8-Pin SOIC 制造商:Rochester Electronics LLC 功能描述:TIMING DEVICE - Bulk |
| IMISM560BZT | 制造商:Cypress Semiconductor 功能描述:PLL Frequency Synthesizer Single 25MHz to 108MHz 8-Pin SOIC T/R |
| IMISM561 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Spread Spectrum Clock Generator |
发布紧急采购，3分钟左右您将得到回复。