MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Voltage Controlled Oscillator
Consider MC12148 for New Designs
The MC1648 requires an external parallel tank circuit consisting of the
inductor (L) and capacitor (C).
For Maximum Performance QL
≥
100 at
Frequency of Operation.
A varactor diode may be incorporated into the tank circuit to provide a
voltage variable input for the oscillator (VCO). The MC1648 was
designed for use in the Motorola Phase–Locked Loop shown in Figure 9.
This device may also be used in many other applications requiring a fixed
or variable frequency clock source of high spectral purity. (See Figure 2)
The MC1648 may be operated from a +5.0Vdc supply or a –5.2Vdc
supply, depending upon system requirements.
NOTE:
The MC1648 is NOT useable as a crystal oscillator.
Pinout: 14–Lead Package
(Top View)
VCC
14
NC
13
TANK
12
NC
11
BIAS
10
NC
9
VEE
8
MC1648
VOLTAGE
CONTROLLED
OSCILLATOR
L SUFFIX
14–LEAD CERAMIC PACKAGE
CASE 632–08
Not Recommended for New Designs
1
VCC
2
NC
3
OUT
4
NC
5
AGC
6
NC
7
VEE
P SUFFIX
14–LEAD PLASTIC PACKAGE
CASE 646–06
Pin assignment is for Dual–in–Line Package.
For PLCC pin assignment, see the MC1648 Non–Standard Pin Conversion Table below.
MC1648 NON–STANDARD PIN CONVERSION DATA
Package
8D
14 L,P
TANK
1
12
VCC
2
14
VCC
3
1
OUT
4
3
AGC
5
5
8
VEE
6
7
10
VEE
7
8
12
BIAS
8
10
14
D SUFFIX
8–PIN PLASTIC SOIC PACKAGE
CASE 751–05
20FN
18
20
2
4
*NOTE – All unused pins are not connected.
Supply Voltage
+5.0Vdc
–5.2Vdc
GND Pins
7,8
1,14
Supply Pins
1,14
7,8
FN SUFFIX
20–LEAD PLCC PACKAGE
CASE 775–02
LOGIC DIAGRAM
BIAS POINT 10
TANK 12
3
OUTPUT
•
•
•
•
Input Capacitance = 6.0pF (TYP)
Maximum Series Resistance for L (External Inductance) = 50Ω (TYP)
Power Dissipation = 150mW (TYP)/Pkg (+5.0Vdc Supply)
Maximum Output Frequency = 225MHz (TYP)
5
AGC
VCC1 = Pin 1
VCC2 = Pin 14
VEE = Pin 7
1/97
©
Motorola, Inc. 1997
1
REV 2
MOTOROLA [ MOTOROLA, INC ]
