RC4153 Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

RC4153

Voltage-to-Frequency Converter

Fairchild Semiconductor 

RC4153

Matching emitter currents in Q35 and Q36 are assured by

degeneration resistors R3 and R4. The differential switch

allows the current source to remain active continuously,

shunting to ground in the off state. This helps stabilize the

PRODUCT SPECIFICATION

output, and again, NPNs reduce switching time, timing

errors, and most important, drift of timing errors over tem-

perature.

To +VS

R46

Q21

Q22

V REF

R60

I IN

Q23

Q24

Q38

Q26 C1

Q25

To

+VS

VB

A

Switched

Current

Output

Source

Q7 Q8

B

To

Collector

of Q11

Q27

To Bias

Network

Q1 Q29

Q28

Q30

Q32

Q35 Q36

R1

34 kW

-VS

R43

56.2 kW

Q31

Q34

R2

56.2 kW

R3

R4

39.2 k W 39.2 kW

Figure 11. Switched Current Source (Detail)

4153-14

13

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