REF. OSC.
15.360 MHz
(ON–CHIP OSC.
OPTIONAL)
NO CONNECTS
X2
“1”
“1”
“1”
RECEIVER 2ND L.O.
30.720 MHz
LOCK DETECT SIGNAL
R2
C
RECEIVER FIRST L.O.
825.030
→
844.980 MHz
(30 kHz STEPS)
OSCout
OSCin
+V
VDD
VSS
N9
RA2
RA1
RA0
LD
φ
R
φ
V
MC
fin
R1
–
R1
+
NOTE 7
R2
C
TRANSMITTER
MODULATION
MC12017
÷
64/65 PRESCALER
NOTE 6
X4
NOTE 6
VCO
X4
NOTE 6
MC145152–2
NOTE 5
N0 A5
A0
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. MC145158–2 may be used where serial data entry is desired.
6. High frequency prescalers (e.g., MC12018 [520 MHz] and MC12022 [1 GHz]) may be used for higher frequency VCO and fref
implementations.
7. The
φ
R and
φ
V outputs are fed to an external combiner/loop filter. See the Phase–Locked Loop — Low–Pass Filter Design page for
additional information. The
φ
R and
φ
V 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.
TRANSMITTER SIGNAL
825.030
→
844.980 MHz
(30 kHz STEPS)
Figure 2. 666–Channel, Computer–Controlled, Mobile Radiotelephone Synthesizer
for 800 MHz Cellular Radio Systems
MC145152–2 Data Sheet Continued on Page 23
MC145151–2 through MC145158–2
8
MOTOROLA
MOTOROLA [ MOTOROLA, INC ]
