MCK1214 ON Semiconductor, MCK1214 Datasheet - Page 4

• Manufacturer Part Number: MCK1214
• Description: Phase-frequency Detector
• Manufacturer: ON Semiconductor

comparator in an analog phase-locked loop. The device
determines the “lead” or “lag” phase relationship and time
difference between the leading edges of a VCO (V) signal
and a Reference (R) input. Since these edges occur only once
per cycle, the detector has a range of ±2p radians.
plots of Figure 2. Figure 2 plots the average value of U, D
and the difference between U and D versus the phase
difference between the V and R inputs.
lags or leads V and the frequency of R is less than or greater
than the frequency of V. Under these four conditions the
12140 will function as follows:
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Figure 2. Average Output Voltage vs. Phase Difference
ORDERING INFORMATION
Specifications Brochure, BRD8011/D.
MCH12140D
MCH12140DG
MCH12140DR2
MCH12140DR2G
MCK12140D
MCK12140DG
MCK12140DR2
MCK12140DR2G
Fv > Fr
The 12140 is a high speed digital circuit used as a phase
The operation of the 12140 can best be described using the
There are four potential relationships between V and R: R
−2p
−2p
−2p
R lags V
−p
−p
−p
Device
U−D
U
D
R leads V
p
p
p
Fv < Fr
2p
2p
2p
APPLICATIONS INFORMATION
V
V
V
V
OH
OH
OH
OL
V
V
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2
OH
− V
2
2
− V
− V
− V
2
OH
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
Package
SOIC−8
SOIC−8
SOIC−8
SOIC−8
SOIC−8
SOIC−8
SOIC−8
SOIC−8
OL
OH
OL
OL
4
R lags V in phase
phase of R lags that of V the U output will stay HIGH while
the D output will pulse from HIGH to LOW. The magnitude
of the pulse will be proportional to the phase difference
between the V and R inputs reaching a minimum 50% duty
cycle under a 180° out of phase condition. The signal on D
indicates to the VCO to decrease in frequency to bring the
loop into lock.
V frequency > R frequency
12140 behaves in a similar fashion as above. Again the
signal on D indicates that the VCO frequency must be
decreased to bring the loop into lock.
R leads V in phase
phase of R leads that of V the D output will stay HIGH while
the U output pulses from HIGH to LOW. The magnitude of
the pulse will be proportional to the phase difference
between the V and R inputs reaching a minimum 50% duty
cycle under a 180° out of phase condition. The signal on U
indicates to the VCO to increase in frequency to bring the
loop into lock.
V frequency < R frequency
behaves in a similar fashion as above. Again the signal on U
indicates that the VCO frequency must be decreased to bring
the loop into lock.
in phase the value of U − D is zero thus providing a zero error
voltage to the VCO. This situation indicates the loop is in lock
and the 12140 action will maintain the loop in its locked state.
When the R and V inputs are equal in frequency and the
When the frequency of V is greater than that of R the
When the R and V inputs are equal in frequency and the
When the frequency of V is less than that of R the 12140
From Figure 2 when V and R are at the same frequency and
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
98 Units / Rail
98 Units / Rail
98 Units / Rail
98 Units / Rail
Shipping
†