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ML145152 Fiches technique(PDF) 8 Page - LANSDALE Semiconductor Inc.

No de pièce ML145152
Description  Parallel-Input PLL Frequency Synthesizer Interfaces with Single-Modulus Prescalers
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Fabricant  LANSDALE [LANSDALE Semiconductor Inc.]
Site Internet  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145152 Fiches technique(HTML) 8 Page - LANSDALE Semiconductor Inc.

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Page 8 of 35
Issue A
LANSDALE Semiconductor, Inc.
ML145152
Figure 2. 666–Channel, Computer–Controlled, Mobile Radiotelephone Synthesizer
for 800 MHz Cellular Radio Systems
LOCK DETECT SIGNAL
R1
+
RECEIVER FIRST L.O.
825.030
→ 844.980 MHz
(30 kHz STEPS)
ML12017
÷ 64/65 PRESCALER
NOTE 6
ML145152
NOTE 5
MC
LD
A0
A5
N9
OSCin
VDD
VSS
OSCout
RA2
RA1
φR
φV
fin
VCO
RA0
N0
+ V
R1
R2
C
R2
C
“1”
“1”
“1”
NO CONNECTS
CHANNEL PROGRAMMING
NOTES:
1. Receiver 1st I.F. = 45 MHz, low side injection; Receiver 2nd I.F. = 11.7 MHz, low side injection.
2. Duplex operation with 45 MHz receiver/transmit separation.
3.fR = 7.5 kHz; ÷ R = 2048.
4. Ntotal = N 64 + A = 27501 to 28166; N = 429 to 440; A = 0 to 63.
5. ML145158 may be used where serial data entry is desired.
6. High frequency prescalers may be used for higher frequency VCO and fref
implementations.
7. 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.
REF. OSC.
15.360 MHz
(ON–CHIP OSC.
OPTIONAL)
X2
X4
NOTE 6
X4
NOTE 6
TRANSMITTER
MODULATION
TRANSMITTER SIGNAL
825.030
→ 844.980 MHz
(30 kHz STEPS)
RECEIVER 2ND L.O.
30.720 MHz
NOTE 7
ML145152 Data Sheet Continued on Page 23


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