MOTOROLA
MC1648
Voltage Controlled Oscillator
Consider MC12148 for New Designs
VOLTAGE
CONTROLLED
OSCILLATOR
Pinout: 14–Lead Package (Top View)
VCC
14
NC
TANK
NC
BIAS
NC
13
12
11
10
9
L SUFFIX
14–LEAD CERAMIC PACKAGE
CASE 632–08
VEE
8
1
2
3
4
5
6
7
VCC
NC
OUT
NC
AGC
NC
Not Recommended for New Designs
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
TANK
VCC
VCC
OUT
AGC
VEE
VEE
8D
1
2
3
4
5
6
7
8
14 L,P
12
14
1
3
5
7
8
10
20FN
18
20
2
4
8
10
12
D SUFFIX
8–PIN PLASTIC SOIC PACKAGE
CASE 751–05
BIAS
14
*NOTE – All unused pins are not connected.
Supply Voltage
GND Pins
+5.0Vdc
7,8
1,14
–5.2Vdc
1,14
FN SUFFIX
20–LEAD PLCC PACKAGE
CASE 775–02
Supply Pins
7,8
LOGIC DIAGRAM
3
BIAS POINT 10
OUTPUT
TANK 12
5
AGC
•
•
•
•
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)
VCC1 = Pin 1
VCC2 = Pin 14
VEE = Pin 7
1/97
© Motorola, Inc. 1997
1
REV 2
LAST ORDER 31/07/99
LIFETIME BUY
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.
LAST SHIP 31/07/00
SEMICONDUCTOR TECHNICAL DATA
