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ML145157EP 데이터시트(PDF) 3 Page - LANSDALE Semiconductor Inc.

부품명 ML145157EP
상세설명  PLL Frequency Synthesizer Family
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제조업체  LANSDALE [LANSDALE Semiconductor Inc.]
홈페이지  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145157EP 데이터시트(HTML) 3 Page - LANSDALE Semiconductor Inc.

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Issue A
LANSDALE Semiconductor, Inc.
ML145151
14 x 8 ROM REFERENCE DECODER
14–BIT
÷ N COUNTER
φV
ML145151 BLOCK DIAGRAM
φR
14–BIT
÷ R COUNTER
TRANSMIT OFFSET ADDER
PHASE
DETECTOR
B
PHASE
DETECTOR
A
LOCK
DETECT
LD
PDout
RA2
fin
VDD
OSCin
OSCout
T/R
14
14
fV
N13
N11
N9
N7 N6
N4
N2
N0
NOTE: N0 – N13 inputs and inputs RA0, RA1, and RA2 have pull–up resistors that are not shown.
RA0
RA1
PIN DESCRIPTIONS
INPUT PINS
fin
Frequency Input (Pin 1)
Input to the ÷N portion of the synthesizer. fin is typically
derived from loop VCO and is AC coupled into the device. For
larger amplitude signals (standard CMOS logic levels) DC
coupling may be used.
RA0 – RA2
Reference Address Inputs (Pins 5, 6, 7)
These three inputs establish a code defining one of eight
possible divide values for the total reference divider, as defined
by the table below.
Pull–up resistors ensure that inputs left open remain at a
logic 1 and require only a SPST switch to alter data to the zero
state.
N0 – N11
N Counter Programming Inputs (Pins 11 – 20, 22 – 25)
These inputs provide the data that is preset into the ÷ N
counter when it reaches the count of zero. N0 is the least sig-
nificant and N13 is the most significant. Pull–up resistors en-
sure that inputs left open remain at a logic 1 and require only
an SPST switch to alter data to the zero state.
T/R
Transmit/Receive Offset Adder Input (Pin 21)
This input controls the offset added to the data provided at
the N inputs. This is normally used for offsetting the VCO fre-
quency by an amount equal to the IF frequency of the trans-
ceiver. This offset is fixed at 856 when T/R is low and gives no
offset when T/R is high. A pull–up resistor ensures that no
connection will appear as a logic 1 causing no offset addition.
OSCin, OSCout
Reference Oscillator Input/Output (Pins 27, 26)
These pins form an on–chip reference oscillator when con-
nected to terminals of an external parallel resonant crystal.
Frequency setting capacitors of appropriate value must be con-
nected from OSCin to ground and OSCout to ground. OSCin
may also serve as the input for an externally generated refer-
ence signal. This signal is typically AC coupled to OSCin, but
for larger amplitude signals (standard CMOS logic levels) DC
coupling may also be used. In the external reference mode, no
connection is required to OSCout.
OUTPUT PINS
PDout
Phase Detector A Output (Pin 4)
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
Reference Address Code
Total
Divide
RA2
RA1
RA0
Divide
Value
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
8
128
256
512
1024
2048
2410
8192


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