TC7135CPL datasheet(14/24 Pages) MICROCHIP

14 / 24 page

TC7135

DS21460C-page 14

 2004 Microchip Technology Inc.

FIGURE 6-2:

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

FIGURE 6-3:

RC Oscillator Circuit.

FIGURE 6-4:

Comparator Clock Circuits.

9 15

DM7447A

Blank MSD On Zero

D1 D2

D3 D4 D5

INT OUT

AZ IN

BUFF

OUT

FIN

+INPUT

–INPUT

ANALOG

COMMON

V–

REF

POL

CREF –

+5V

0.33 µF

200 kHz

–

Analog

Input

1µF

100 k

Ω

1µF

4.7 k

Ω

1µF

100 k

Ω

100 k

Ω

RBI

V+

CREF+

TC7135

MCP1525

a. If R

1 = R2 = R1, F≅ 0.55/RC

a. F = 120 kHz, C = 420 pF

1 = 8.93 kΩ

R1 = 27.3 kΩ

Gates are 74C04

2C 0.41R

0.7R

()

--------------------------------------------------

1R2

------------------

b. If R

2 >> R1, F ≅ 0.45/R1C

c. If R

2 << R1, F ≅ 0.72/R1C

2. Examples:

1 = R2 ≈ 10.9 kΩ

b. F = 120 kHz, C = 420pF, R

2 = 50 kΩ

c. F = 120 kHz, C = 220 pF, R

2 = 5 kΩ

+5V

VOUT

390 pF

30 k

Ω

16 k

Ω

0.22 µF

16 k

Ω

+5V

VOUT

100 k

Ω

100 k

Ω

50 k

Ω

10 pF

Ω

0.1 µF

–

LM311

–

LM311

56 k

Ω

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