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TLC2932 数据表(PDF) 16 Page - Texas Instruments

部件名 TLC2932
功能描述  HIGH-PERFORMANCE PHASE-LOCKED LOOP
Download  29 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TLC2932 数据表(HTML) 16 Page - Texas Instruments

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TLC2932
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997
16
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 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 lag-lead 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
Using this filter makes the closed loop PLL system a second-order type 1 system. The response curves of this
system to a unit step are shown in Figure 26.
the active filter
When using the active integrator shown in Figure 25(c), the phase detector inputs must be reversed since the
integrator 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
Using this filter makes the closed loop PLL system a second-order type 2 system. The response curves of this
system to a unit step are shown in Figure 27.
basic design example
The following design example presupposes that the input reference frequency and the required frequency of
the VCO are within the respective ranges of the device.


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