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ML145152 bảng dữ liệu(PDF) 11 Page - LANSDALE Semiconductor Inc.

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Giải thích chi tiết về linh kiện  Parallel-Input PLL Frequency Synthesizer Interfaces with Single-Modulus Prescalers
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nhà sản xuất  LANSDALE [LANSDALE Semiconductor Inc.]
Trang chủ  http://www.lansdale.com
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Issue A
LANSDALE Semiconductor, Inc.
ML145155
ML145155
TYPICAL APPLICATIONS
Figure 1. Microprocessor–Controlled TV/CATV Tuning System with Serial Interface
fin
3
LED DISPLAY
MC14489
KEYBOARD
CMOS
MPU/MCU
ENB
CLK
DATA
1/2 MC1458*
ML145155
MC120xx
PRESCALER
UHF/VHF
TUNER OR
CATV
FRONT END
4.0 MHz
φV
φR
+
* The
φR and φV outputs are fed to an external combiner/loop filter. See the Phase–Locked Loop – Low–Pass Filter Design page
for additional information.The
φR and φV outputs swing rail–to–rail.Therefore, the user should be careful not to exceed the common
mode input range of the op amp used in the combiner/loop filter.
OUTPUT PINS
PDout
Phase Detector A Output (PDIP, SOG – Pin 6)
Three–state output of phase detector for use as loop error
signal. Double–ended outputs are also available for this pur-
pose (see
φV and φR).
Frequency fV > fR or fV Leading: Negative Pulses
Frequency fV < fR or fV Lagging: Positive Pulses
Frequency fV = fR and Phase Coincidence: High–Imped-
ance State
φR, φV
Phase Detector B Outputs (PDIP, SOG – Pins 4, 3)
These phase detector outputs can be combined externally for
a loop–error signal. A single–ended output is also available for
this purpose (see PDout).
If frequency fV is greater than fR or if the phase of fV is
leading, then error information is provided by fV pulsing low.
fR remains essentially high.
If the frequency fV is less than fR or if the phase of fV is
lagging, then error information is provided by fR pulsing low.
fV remains essentially high.
If the frequency of fV = fR and both are in phase, then both
fV and fR remain high except for a small minimum time peri-
od when both pulse low in phase.
LD
Lock Detector Output (PDIP – Pin 8, SOG – Pin 9)
Essentially a high level when loop is locked (fR, fV of same
phase and frequency). LD pulses low when loop is out of lock.
SW1, SW2
Band Switch Outputs (PDIP – Pins 13, 14; SOG – Pins 14, 15)
SW1 and SW2 provide latched open–drain outputs corre-
sponding to data bits numbers one and two. These outputs can
be tied through external resistors to voltages as high as 15 V,
independent of the VDD supply voltage. These are typically
used for band switch functions. A logic 1 causes the output to
assume a high–impedance state, while a logic 0 causes the out-
put to be low.
REFout
Buffered Reference Oscillator Output (PDIP, SOG – Pin 15)
Buffered output of on–chip reference oscillator or externally
provided reference–input signal.
POWER SUPPLY
VDD
Positive Power Supply (PDIP, SOG – Pin 5)
The positive power supply potential. This pin may range
from + 3 to + 9 V with respect to VSS.
VSS
Negative Power Supply (PDIP, SOG – Pin 7)
The most negative supply potential. This pin is usually
ground.


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