參數(shù)資料
型號(hào)： TLC2942IDBLE
廠商： TEXAS INSTRUMENTS INC
元件分類： PLL合成/DDS/VCOs
英文描述： PHASE LOCKED LOOP, 20 MHz, PDSO38
封裝： PLASTIC, SO-38
文件頁(yè)數(shù)： 11/29頁(yè)
文件大小： 473K
代理商： TLC2942IDBLE
TLC2942
HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
low-pass-filter (LPF) configurations
Many excellent references are available that include detailed design information about LPFs and they should
be consulted for additional information. Lag-lead filters or active filters are often used. Examples of LPFs are
shown in Figure 25. When the active filter of Figure 25(c) is used, the reference should be applied to FIN-B
because of the amplifier inversion. Also, in practical filter implementations, C2 is used as additional filtering at
the VCO input. The value of C2 should be equal to or less than one-tenth the value of C1.
R1
C1
T1 = C1R1
(a) LAG FILTER
R1
C1
T1 = C1R1
T2 = C1R2
R2
(b) LAG-LEAD FILTER
R2
C1
R1
T1 = C1R1
T2 = C1R2
(c) ACTIVE FILTER
A
–
VI
VO
VI
VO
VI
C2
VO
C2
Figure 25. LPF Examples for PLL
the passive filter
The transfer function for the low-pass filter shown in Figure 25(b) is:
V
O
V
IN
+
1
) s
@ T2
1
) s
@ (T1 ) T2)
Where
T1
+ R1
@ C1 and T2 + R2 @ C1
(2)
Using this filter makes the closed loop PLL system a type 1 second-order system. The response curves of this
system to a unit step are shown in Figure 26.
the active filter
When using the active filter shown in Figure 25(c), the phase detector inputs must be reversed since the filter
adds an additional inversion. Therefore, the input reference frequency should be applied to the FIN-B terminal
and the output of the VCO divider should be applied to the input reference terminal, FIN-A.
The transfer function for the active filter shown in Figure 25(c) is:
F(s)
+ 1 ) s @ R2 @ C1
s
@ R1 @ C1
(3)
Using this filter makes the closed loop PLL system a type 2 second-order system. The response curves of this
system to a unit step are shown in Figure 27.
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