mc145170-2 Freescale Semiconductor, Inc, mc145170-2 Datasheet - Page 13

• Manufacturer Part Number: mc145170-2
• Description: Pll Frequency Synthesizer With Serial Interface
• Manufacturer: Freescale Semiconductor, Inc

Frequency of f
Frequency and Phase of f
POL bit (C7) = high
Frequency of f
Frequency of f
Frequency and Phase of f
This output can be enabled, disabled, and inverted via the C register. If desired, PD
high-impedance state by utilization of the disable feature in the C register (patented).
φ
Double-Ended Phase/Frequency Detector Outputs
(Pins 14, 15)
These outputs can be combined externally to generate a loop error signal. Through use of a patented
technique, the detector's dead zone has been eliminated. Therefore, the phase/frequency detector is
characterized by a linear transfer function. The operation of the phase/frequency detector is described
below and is shown in
POL bit (C7) in the C register = low (see
Frequency of f
Frequency of f
Frequency and Phase of f
period when both pulse low in phase
POL bit (C7) = high
Frequency of f
Frequency of f
Frequency and Phase of f
period when both pulse low in phase
These outputs can be enabled, disabled, and interchanged via the C register (patented).
LD
Lock Detector Output (Pin 11)
This output is essentially at a high level with narrow low-going pulses when the loop is locked (f
of the same phase and frequency). The output pulses low when f
frequencies (see
This output can be enabled and disabled via the C register (patented). Upon power up, on-chip
initialization circuitry disables LD to a static low logic level to prevent a false “lock” signal. If unused, LD
should be disabled and left open.
Freescale Semiconductor
R
and φ
V
V
V
V
V
V
V
V
< f
> f
< f
> f
< f
> f
< f
Figure
R
R
R
R
R
R
R
or Phase of f
or Phase of f
or Phase of f
or Phase of f
or Phase of f
or Phase of f
or Phase of f
Figure
19).
V
V
V
V
= f
= f
= f
= f
R
R
19.
R
R
: essentially high-impedance state; voltage at pin determined by loop filter
: essentially high-impedance state; voltage at pin determined by loop filter
: φ
: φ
V
V
V
V
V
V
V
V
V
Lagging f
Leading f
Lagging f
Leading f
Lagging f
and φ
Leading f
Lagging f
and φ
MC145170-2 Technical Data, Rev. 5
Figure
R
R
remain essentially high, except for a small minimum time
remain essentially high, except for a small minimum time
R
R
R
R
R
R
R
: positive pulses from high impedance
: φ
: φ
: positive pulses from high impedance
: negative pulses from high impedance
: φ
: φ
16)
V
R
V
R
= negative pulses, φ
= negative pulses, φ
= essentially high, φ
= essentially high, φ
V
and f
R
R
V
V
R
are out of phase or different
= essentially high
= essentially high
= negative pulses
= negative pulses
out
can be forced to the
Pin Connections
R
and f
13
V