ALD1712A/ALD1712B

Advanced Linear Devices

6 of 9

ALD1712

TYPICAL APPLICATIONS

ULTRA LONG TIME CONSTANT INTEGRATOR

WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE

WAVE GENERATOR

LOW OFFSET SUMMING AMPLIFIER

RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER

-

+

OUTPUT

VIN

5V

CL

RL =10KΩ

0.1µF

~

ZIN = 1012Ω

400pF

* See rail to rail waveform

0 ≤ VIN ≤ 5V

10K

-

+

OUTPUT

10K

10K

+2.5V

-2.5V

.01µF

1

f =

~ 1.6KHz

C = .01µF

R = 10K

* See rail to rail waveform

~

OUTPUT

INPUT 1

INPUT 2

-

+

+2.5V

.01µF

.01µF

- 2.5V

GAIN = 5

* Circuit Drives Large Load

Capacitance ≤ 4000pF

10K

10K

50K

RAIL-TO-RAIL WAVEFORM

Performance waveforms.

Upper trace is the output of a

Wien Bridge Oscillator. Lower

trace is the output of Rail-to-Rail

voltage follower.

0V

+5V

OUTPUT

0V

+5V

INPUT

-

+

20K

20K

Relay 1

INTEGRATOR

VOLTAGE

PRESET

Relay 2

R

VIN

3

2

4

0.1

-5 V

6

+5V

7

0.1

V = 1/RC

ALD1712

Control 1

-

+

1

2

3

1.5V

1/2 ALD2301

8

5V

* LOW LEAKAGE CAPACITOR

e.g. TEFLON CAPACITOR TYPE

K11B104KSW Component

Research Inc.

• All capacitance values are in µF unless otherwise specified.

• RELAYS 1 & 2 are of type 4705, Gordos Corporation.

5V

C*

t2

t1

VIN = dt

Control 2

-

+

7

6

5

1.5V

1/2 ALD2301

4

5V

PHOTO DETECTOR CURRENT TO

VOLTAGE CONVERTER

+

-

+2.5V

-2.5V

RF = 5M

RL = 10K

VOUT = I x RF

I

PHOTODIODE

RAIL-TO-RAIL VOLTAGE COMPARATOR

-

+

OUTPUT

50K

0.1µF

+5V

10M

+5V