TFBS6712 datasheet(7/14 Pages) VISHAY

Part #	TFBS6712

Description	Low Profile Fast Infrared Transceiver (FIR, 4 Mbit/s) for IrDA Applications with Low voltage Logic (1.8 V)

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Manufacturer	VISHAY [Vishay Siliconix]

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Document Number 84674

Rev. 1.2, 21-Feb-07

TFBS6712

Vishay Semiconductors

Recommended Circuit Diagram

Operated at a clean low impedance power supply the

TFBS6712 needs no additional external components.

However, depending on the entire system design and

board layout, additional components may be required

(see figure 3).

The capacitor C1 is buffering the supply voltage and

eliminates the inductance of the power supply line.

This one should be a Tantalum or other fast capacitor

to guarantee the fast rise time of the IRED current.

Vishay transceivers integrate a sensitive receiver and

a built-in power driver. The combination of both needs

a careful circuit board layout. The use of thin, long,

resistive and inductive wiring should be avoided. The

inputs (TXD, SD) and the output RXD should be

directly (DC) coupled to the I/O circuit.

The capacitor C2 combined with the resistor R2 is the

low pass filter for smoothing the supply voltage.

R2, C1 and C2 are optional and dependent on the

quality of the supply voltages VCCx and injected

noise. An unstable power supply with dropping volt-

age during transmission may reduce the sensitivity

(and transmission range) of the transceiver.

The placement of these parts is critical. It is strongly

recommended to position C2 as close as possible to

the transceiver power supply pins.

A Tantalum capacitor should be used for C1 while a

ceramic capacitor is used for C2.

In addition, when connecting the described circuit to

the power supply, low impedance wiring should be

used.

When extended wiring is used the inductance of the

power supply can cause dynamically a voltage drop

at VCC2. Often some power supplies are not able to

follow the fast current rise time. In that case another

4.7 µF (type, see tavle under C1) at VCC2 will be help-

ful.

Keep in mind that basic RF-design rules for circuit

design should be taken into account. Especially

longer signal lines should not be used without termi-

nation. See e.g. "The Art of Electronics" Paul Horo-

witz, Winfield Hill, 1989, Cambridge University Press,

ISBN: 0521370957.

Table 1. Recommended Application Circuit Compo-

nents

I/O and Software

In the description, already different I/Os are men-

tioned. Different combinations are tested and the

function verified with the special drivers available

from the I/O suppliers. In special cases refer to the I/

O manual, the Vishay application notes, or contact

directly Vishay Sales, Marketing or Application.

Figure 3. Recommended Application Circuit

IRED Anode

VCC

Ground

SD

TXD

RXD

V

CC2

VCC1

GND

SD

TXD

RXD

R1

R2

C1

C2

19430

Component

Recommended Value

C1

4.7 µF, 16 V

Vishay part#:

293D 475X9 016B

C2

0.1 µF, Ceramic

Vishay part#:

VJ1 206 Y 104 J XXMT

R1

3.3 V supply voltage: no resistor necessary, the

internal controller is able to control the current

R2

4.7

Ω, 0.125 W

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