HA-4900 Ver la hoja de datos (PDF) - Renesas Electronics

Número de pieza

componentes Descripción

Fabricante

HA-4900

Precision Quad Comparators

Renesas Electronics 

HA-4900, HA-4902, HA-4905

D/A

MEMORY

MICRO-

PROCESSOR

COMPARATORS

ANALOG INPUT MODULE

PROCESSOR

Logic Level Translators

The HA-4900 series comparators can be used as versatile

logic interface devices as shown in the circuits above.

Negative logic devices may also be interfaced with appropriate

supply connections. If separate supplies are used for V- and

VLOGIC-, these logic level translators will tolerate several volts

of ground line differential noise.

+5.0V

V+

+5V TO +15V

4.7k

VL+

10k

+5.0V

+

1/4

HA-4900

-

+

1/4

HA-4900

-

1N914s

10k

+

1/4

HA-4900

-

+

1/4

HA-4900

-

TTL TO CMOS

CMOS TO TTL

RS-232 To CMOS Line Receiver

This RS-232 type line receiver to drive CMOS logic uses a

Schmitt trigger feedback network to give about 1V input

hysteresis for added noise immunity. A possible problem in an

interface which connects two equipments, each plugged into a

different AC receptacle, is that the power line voltage may

appear at the receiver input when the interface connection is

made or broken. The two diodes and a 3W input resistor will

protect the inputs under these conditions.

4.7k

3W

1k

+10V

-

1/4

HA-4900

+

56k 51k

1N4001s

1k

Window Detector

The high switching speed, low offset current and low offset

voltage of the HA-4900 series makes this window detector

circuit extremely well suited to applications requiring fast,

accurate, decision-making. The circuit above is ideal for

industrial process system feedback controllers or “out-of-limit”

alarm indicators.

+15V

VL+

INPUT

+

HIGH REF

-

+5.0V

HIGH

LOW REF

-15V

+

-

IN

WINDOW

1/4 HD-74C02

LOW

1/2 HA-4900

Oscillator/Clock Generator

This self-starting fixed frequency oscillator circuit gives

excellent frequency stability. R1 and C1 comprise the

frequency determining network while R2 provides the

regenerative feedback. Diode D1 enhances the stability by

compensating for the difference between VOH and VSUPPLY.

In applications where a precision clock generator up to 100kHz

is required, such as in automatic test equipment, C1 may be

replaced by a crystal.

V+

R2

150k

1N914 D1

V+

150k

150k

+

1/4

HA-4900

-

f  -----------1------------

2.1 R1 C1

C1

R1

50k

Schmitt Trigger (Zero Crossing Detector With Hysteresis)

This circuit has a 100mV hysteresis which can be used in

applications where very fast transition times are required at the

output even though the signal input is very slow. The

hysteresis loop also reduces false triggering due to noise on

the input. The waveforms below show the trip points developed

by the hysteresis loop.

FN2855 Rev 5.00

June 28, 2012

Page 5 of 10

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