MCH12140 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MCH12140 Datasheet PDF : 4 Pages
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MCH12140 MCK12140
DC CHARACTERISTICS (VEE = VEE(min) – VEE(max); VCC = GND, unless otherwise noted.)
–40°C
0°C
25°C
70°C
Characteristic
Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit
Power Supply Current H IEE
K
45
38 45 52 38 45 52 38 45 52 mA
45
38 45 52 38 45 52 42 50 58
Power Supply Voltage H VEE –4.75 –5.2 –5.5 –4.75 –5.2 –5.5 –4.75 –5.2 –5.5 –4.75 –5.2 –5.5 V
K
–4.20 –4.5 –5.5 –4.20 –4.5 –5.5 –4.20 –4.5 –5.5 –4.20 –4.5 –5.5
Input HIGH Current
IIH
150
150
150
150 µA
AC CHARACTERISTICS (VEE = VEE(min) – VEE(max); VCC = GND, unless otherwise noted.)
–40°C
0°C
25°C
70°C
Characteristic
Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit
Maximum Toggle Frequency FMAX
800
650 800
650 800
650 800
Propagation Delay
to Output
R to D
R to U
V to D
V to U
tPLH
tPHL
440
320 440 580 320 440 580 360 480 620 ps
330
210 330 470 210 330 470 240 360 500
330
210 330 470 210 330 470 240 360 500
440
320 440 580 320 440 580 360 480 620
Output Rise/Fall Times
tr
Q (20 to 80%)
tf
ps
225
100 225 350 100 225 350 100 225 350
APPLICATIONS INFORMATION
The 12140 is a high speed digital circuit used as a phase
R lags V in phase
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 ±2π radians.
The operation of the 12140 can best be described using
the plots of Figure 1. Figure 1 plots the average value of U, D
and the difference between U and D versus the phase
difference between the V and R inputs.
There are four potential relationships between V and R: R
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:
When the R and V inputs are equal in frequency and the
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
When the frequency of V is greater than that of R the
12140 behaves in a simlar 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
Fv > Fr
Figure 1. Average Output Voltage versus
Phase Difference
R lags V
U
R leads V
Fv < Fr
VOH
When the R and V inputs are equal in frequency and the
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
VOH – VOL
180° out of phase condition. The signal on U indicates to the
–2π
–π
π
2π
2
VCO to increase in frequency to bring the loop into lock.
D
V frequency < R frequency
–2π
–π
π
U–D
VOH
VOH – VOL
2π
2
VOH – VOL
2
When the frequency of V is less than that of R the 12140
behaves in a simlar fashion as above. Again the signal on U
indicates that the VCO frequency must be decreased to bring
the loop into lock.
From Figure 1 when V and R are at the same frequency
and 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
–2π
–π
π
2π
locked state.
VOL – VOH
2
MOTOROLA RF/IF DEVICE DATA
3
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