参数资料
型号: T9000
厂商: Lineage Power
英文描述: ISDN Network Termination Node (NTN) Device(ISDN网络终端节点器件)
中文描述: ISDN网络终端节点(新界西)设备(ISDN网网络终端节点器件)
文件页数: 99/126页
文件大小: 1523K
代理商: T9000
Lucent Technologies Inc.
99
Advance Data Sheet
April 2000
ISDN Network Termination Node (NTN) Device
T9000
12 PWM Module
(continued)
12.4 PWM Auto Mode Example
(continued)
As mentioned earlier, when PWV is is greater than 2
8
, some ROM values will be skipped. Another way of stating
this is that, when Ka is less than 2
8
, some ROM values will be skipped. This is true by definition, since Ka repre-
sents the number of samples output during one period of a sine wave, and there are 2
8
ROM samples. If one crite-
rion of the generated
sinewave is that the amplitude be as accurate as possible (i.e., no ROM values are skipped), then the choice of
entries in Table 103 above are limited to those whose values of Ka that are greater than or equal to 256. Note that
only three of the entries meet this requirement in this example.
This example is provided to illustrate some of the considerations when selecting values for range and granularity. It
may be useful to construct a spreadsheet that reproduces Table 103 (which itself was generated using a spread-
sheet) for the frequency value of interest. Other engineering trade-offs, such as low-pass filter complexity vs. PWM
output accuracy, are beyond the scope of this document but may be important to consider depending on the spe-
cific system requirements.
5-6524F
Figure 23. Widths of PWM Pulses Generated with a 2.5%
97.5% Modulation Width
35
30
25
20
15
10
5
00
2
4
6
8
10
12
14
16
18
20
22
SAMPLE (PERIOD) #
P
2.5%—97.5% SINE MODULATION SAMPLES
24
26
28
30
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