參數(shù)資料
型號(hào)： 5962-8875701EA
廠商： TEXAS INSTRUMENTS INC
元件分類： PLL合成/DDS/VCOs
英文描述： PHASE LOCKED LOOP, 38 MHz, CDIP16
封裝： CERAMIC, DIP-16
文件頁(yè)數(shù)： 27/32頁(yè)
文件大?。?/td> 687K
代理商： 5962-8875701EA
4
The frequency capture range (2fC) is dened as the
frequency range of input signals on which the PLL will lock if
it was initially out-of-lock. The frequency lock range (2fL)is
dened as the frequency range of input signals on which the
loop will stay locked if it was initially in lock. The capture
range is smaller or equal to the lock range.
With PC1, the capture range depends on the low-pass lter
characteristics and can be made as large as the lock range.
This conguration retains lock behavior even with very noisy
input signals. Typical of this type of phase comparator is that
it can lock to input frequencies close to the harmonics of the
VCO center frequency.
Phase Comparator 2 (PC2)
This is a positive edge-triggered phase and frequency
detector. When the PLL is using this comparator, the loop
is controlled by positive signal transitions and the duty
factors of SIGIN and COMPIN are not important. PC2
comprises two D-type ip-ops, control-gating and a three-
state output stage. The circuit functions as an up-down
counter (Figure 1) where SIGIN causes an up-count and
COMPIN a down-count. The transfer function of PC2,
assuming ripple (fr = fi) is suppressed, is:
VDEMOUT =(VCC/4π)(φSIGIN - φCOMPIN) where
VDEMOUT is the demodulator output at pin 10;
VDEMOUT =VPC2OUT (via low-pass lter).
The average output voltage from PC2, fed to the VCO via the
low-pass lter and seen at the demodulator output at pin 10
(VDEMOUT), is the resultant of the phase differences of
SIGIN and COMPIN as shown in Figure 4. Typical waveforms
for the PC2 loop locked at fo are shown in Figure 5.
When the frequencies of SIGIN and COMPIN are equal but
the phase of SIGIN leads that of COMPIN, the p-type output
driver at PC2OUT is held “ON” for a time corresponding to
the phase difference (
φDEMOUT). When the phase of SIGIN
lags that of COMPIN, the n-type driver is held “ON”.
When the frequency of SIGIN is higher than that of
COMPIN, the p-type output driver is held “ON” for most of
the input signal cycle time, and for the remainder of the
cycle both n- and p-type drivers are “OFF” (three-state). If
the SIGIN frequency is lower than the COMPIN frequency,
then it is the n-type driver that is held “ON” for most of the
cycle. Subsequently, the voltage at the capacitor (C2) of
the low-pass lter connected to PC2OUT varies until the
signal and comparator inputs are equal in both phase and
FIGURE 2. PHASE COMPARATOR 1: AVERAGE OUTPUT
VOLTAGE vs INPUT PHASE DIFFERENCE:
VDEMOUT = VPC1OUT = (VCC/π) (φSIGIN -
φCOMPIN); φDEMOUT =(φSIGIN - φCOMPIN)
VCC
VDEMOUT (AV)
1/2 VCC
0
0o
90o
φ
DEMOUT
180o
FIGURE 3. TYPICAL WAVEFORMS FOR PLL USING PHASE
COMPARATOR 1, LOOP LOCKED AT fo
SIGIN
COMPIN
VCOOUT
PC1OUT
VCOIN
VCC
GND
FIGURE 4. PHASE COMPARATOR 2: AVERAGE OUTPUT
VOLTAGE vs INPUT PHASE DIFFERENCE:
VDEMOUT = VPC2OUT
= (VCC/4π) (φSIGIN - φCOMPIN);
φDEMOUT =(φSIGIN - φCOMPIN)
VCC
VDEMOUT (AV)
1/2 VCC
0
-360o
0o
φ
DEMOUT
360o
FIGURE 5. TYPICAL WAVEFORMS FOR PLL USING PHASE
COMPARATOR 2, LOOP LOCKED AT fo
SIGIN
COMPIN
VCOOUT
PC2OUT
VCOIN
VCC
GND
PCPOUT
HIGH IMPEDANCE OFF - STATE
CD54HC4046A, CD74HC4046A, CD54HCT4046A, CD74HCT4046A
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