MC100EL1648DG(2008) Просмотр технического описания (PDF) - ON Semiconductor

Номер в каталоге

Компоненты Описание

производитель

MC100EL1648DG
(Rev.:2008)

5 V ECL Voltage Controlled Oscillator Amplifier

ON Semiconductor 

MC100EL1648

OPERATION THEORY

Figure 5 illustrates the simplified circuit schematic for the

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

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 RE.

VCC 2 (14)

VCC 3 (1)

800 W 1.36 KW

1.6 KW

Q11

Q10

400 W D2

3.1 KW

660 W

167 W

Q9

Q1

Q3 Q2

Q7 Q6

D1

330 W

Q8

16 KW

Q4

Q5

82 W 400 W

660 W

OUTPUT

4 (3)

510 W

VEE

7 (8)

BIAS TANK

8 (10) 1 (12)

VEE AGC

6 (7) 5 (5)

Figure 5. Circuit Schematic

8 pin (14 pin) Lead Package

http://onsemi.com

6

Share Link: