參數(shù)資料
型號(hào): TLC2932IPW
廠商: TEXAS INSTRUMENTS INC
元件分類: PLL合成/DDS/VCOs
英文描述: PHASE LOCKED LOOP, 40 MHz, PDSO14
封裝: PLASTIC, TSSOP-14
文件頁(yè)數(shù): 9/28頁(yè)
文件大小: 665K
代理商: TLC2932IPW
TLC2932
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
basic design example (continued)
Assume the loop has to have a 100
s settling time (ts) with a countdown N = 8. Using the Type 1, second order
response curves of Figure 26, a value of 4.5 radians is selected for
ωnts with a damping factor of 0.7. This
selection gives a good combination for settling time, accuracy, and loop gain margin. The initial parameters are
summarized in Table 5. The loop constants, KV and Kp, are calculated from the data sheet specifications and
Table 6 shows these values.
The natural loop frequency is calculated as follows:
wnts + 4.5
Then
wn +
4.5
100
ms +
45 k-radians sec
Since
Table 5. Design Parameters
PARAMETER
SYMBOL
VALUE
UNITS
Division factor
N
8
Lockup time
t
100
s
Radian value to selected lockup time
ωnt
4.5
rad
Damping factor
ζ
0.7
Table 6. Device Specifications
PARAMETER
SYMBOL
VALUE
UNITS
VCO gain
76.6
Mrad/V/s
fMAX
70
MHz
fMIN
KV
20
MHz
VIN MAX
5
V
VIN MIN
0.9
V
PFD gain
Kp
0.342357
V/rad
Table 7. Calculated Values
PARAMETER
SYMBOL
VALUE
UNITS
Natural angular frequency
ωn
45000
rad/sec
K = (KV Kp)/N
3.277
Mrad/sec
Lag-lead filter
Calculated value
Nearest standard value
R1
15870
16000
Calculated value
Nearest standard value
R2
308
300
Selected value
C1
0.1
F
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