TC7135CBU datasheet(11/13 Pages) TELCOM

No. de pieza	TC7135CBU

Descripción Electrónicos	4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER

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Fabricante Electrónico	TELCOM [TelCom Semiconductor, Inc]

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TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

TC7135

4-1/2 DIGIT

ANALOG-TO-DIGITAL CONVERTER

is disabled for one clock pulse at the beginning of the

reference integrate (deintegrate) phase. This one-count

delay compensates for the delay of the zero-crossing flip-

flop, and allows the correct number to be latched into the

display. Similarly, a one-count delay at the beginning of

auto-zero gives an overload display of 0000 instead of 0001.

No delay occurs during signal integrate, so true ratiometric

readings result.

Generating a Negative Supply

A negative voltage can be generated from the positive

supply by using a TC7660. (See Figure 9.)

TC7660

TC7135

11

1

+5V

8

23

(–5V)

V

+

V

–

24

10 µF

5

4

10 µF

+

Figure 9. Negative Supply Voltage Generator

TYPICAL APPLICATIONS

R2

R1

fO

GATES ARE 74C04

C

+5V

VOUT

390 pF

30 k

Ω

7

8

2

3

16 k

Ω

0.22

µF

16 k

Ω

4

1 k

Ω

1

+5V

VOUT

2

3

1

4

7

6

R2

100 k

Ω

R2

100 k

Ω

R3

50 k

Ω

C2

10 pF

R4

2 k

Ω

C1

0.1

µF

LM311

56 k

Ω

Comparator Clock Circuit

RC Oscillator Circuit

1. fO ≈

, RP =

a. If R = R1 = R2, f ≅ 0.55/RC

b. If R2 >> R1, f ≅ 0.45/R1C

c. If R2 << R1, f ≅ 0.72/R1C

2. 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

1

2 C[0.41 RP + 0.70 R1]

R1 R2

R1 + R2

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TC7135CBU Datasheet(PDF) 11 Page - TelCom Semiconductor, Inc

TC7135CBU Datasheet(HTML) 11 Page - TelCom Semiconductor, Inc

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