MC100EL1648D ON Semiconductor, MC100EL1648D Datasheet - Page 6

VCO Oscillators 5V ECL VCO

MC100EL1648D

Manufacturer Part Number
MC100EL1648D
Description
VCO Oscillators 5V ECL VCO
Manufacturer
ON Semiconductor
Datasheet

Specifications of MC100EL1648D

Package / Case
SOIC-8
Supply Voltage
5 Volts
Product
VCO
Lead Free Status / Rohs Status
No RoHS Version Available

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MC100EL1648. The oscillator incorporates positive feedback
by coupling the base of transistor Q6 to the collector of Q7. An
automatic gain control (AGC) is incorporated to limit the
current through the emitter−coupled pair of transistors (Q7 and
Q6) and allow optimum frequency response of the oscillator.
In order to maintain the high quality factor (Q) on the oscillator,
and provide high spectral purity at the output, transistor Q4 is
used to translate the oscillator signal to the output differential
pair Q2 and Q3. Figure 16 indicates the high spectral purity
of the oscillator output (pin 4 on 8−pin SOIC). Transistors
Figure 5 illustrates the simplified circuit schematic for the
Q11
1.6 KW
800 W
400 W
Q10
7 (8)
V
EE
1.36 KW
D2
8 (10)
BIAS
Q9
TANK
1 (12)
330 W
Q7 Q6
Q8
Figure 5. Circuit Schematic
OPERATION THEORY
V
CC
http://onsemi.com
V
6 (7)
2 (14)
EE
16 KW
D1
AGC
6
5 (5)
3.1 KW
Q2 and Q3, in conjunction with output transistor Q1,
provide a highly buffered output that produces a square
wave. The typical output waveform can be seen in Figure 4.
The bias drive for the oscillator and output buffer is provided
by Q9 and Q11 transistors. In order to minimize current, the
output circuit is realized as an emitter−follower buffer with
an on chip pull−down resistor R
Q5
82 W
Q4
660 W
400 W
Q3
8 pin (14 pin) Lead Package
Q2
660 W
167 W
E
.
V
CC
Q1
510 W
3 (1)
OUTPUT
4 (3)

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