TC835 datasheet(11/12 Pages) TELCOM

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TELCOM SEMICONDUCTOR, INC.

TC835

PERSONAL COMPUTER

DATA ACQUISITION A/D CONVERTER

TYPICAL APPLICATIONS DIAGRAMS

4-1/2 Digit ADC With Multiplexed Common Anode LED Display

9–15

777

7447

BLANK MSD ON ZERO

INT OUT

AZ IN

BUFF

OUT

fIN

+INPUT

–INPUT

ANALOG

COMMON

V –

REF

POL

CREF

+5V

0.33µF

200 kHz

–

ANALOG

INPUT

1 µF

100 k

Ω

1 µF

4.7 k

Ω

1 µF

–5V

100 k

Ω

100 k

Ω

6.8 k

Ω

RBI

CREF

–

TC04

TC835

GATES ARE 74C04

R1 R2

R1 + R2

2 C(0.41 RP + 0.7 R1)

fO =

, RP =

a. If R1 = R2 = R1, f ≅ 0.55/RC

b. If R2 >> R1, f ≅ 0.45/R1C

c. If R2 << R1, f ≅ 0.72/R1C

Examples:

a. f = 120 kHz, C = 420 pF

R1 = R2 ≈ 10.9 kΩ

b. f = 120 kHz, C = 420 pF, R2 = 50 kΩ

R1 = 8.93 kΩ

c. f = 120 kHz, C = 220 pF, R2 = 5 kΩ

R1 = 27.3 kΩ

RC Oscillator Circuit

Comparator Clock Circuits

+5V

VOUT

390 pF

30 k

Ω

16 k

Ω

0.22 µF

16 k

Ω

1 k

Ω

+5V

VOUT

100 k

Ω

100 k

Ω

50 k

Ω

10 pF

2 k

Ω

0.1 µF

LM311

56 k

Ω

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