epc136 datasheet(7/11 Pages) EPC

Part #	epc136

Description	Photo-receiver Amplifier

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Manufacturer	EPC [Espros Photonics corp]

Direct Link	http://www.espros.ch

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Functional Description

Power-up Sequence

If VDD reaches VPOR, the startup sequence is initiated. After a time tDEL, the photo diode bias circuit is enabled. Thus, a current generated by

light on the photo diode flows into the pin PD. After the time tINIT, the device is ready to receive AC light pulses.

V

DD

V

POR

t

INIT

Startup

Period

Ready

Out

false pulses may occur

Power-up sequence

Power-down Sequence

When VDD goes down, the device is turned off when VDD is below VPOR minus VIPOR.

V

DD

V

POR -

V

IPOR

t

OFF

PD bias

Power-down sequence

Light Pulse Reception

A light pulse on the photo diode generates a current pulse into the pin PD of the device. If the current pulse exceeds the threshold IPD, an out-

put pulse is generated. The length of the output pulse is given by tOUT. After a waiting time given by tREC, the next light pulse can be sent. If the

waiting time is too short, the device is not ready to receive the next pulse. Thus, no output pulse is appears at pin OUT.

IR LED Pulse

T

IR LED

T

PD

PD Signal

Out Signal

t

OUT

t

REC

t

OUT

t

OUT

2nd pulse indicates light

reserve threshold triggered

Light pulse reception

Characteristics subject to change without notice

7

Datasheet_epc134-139_digital-V2.5

www.espros.ch

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epc136 Datasheet(PDF) 7 Page - Espros Photonics corp

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