CS8130-CS datasheet(22/28 Pages) CIRRUS

22 / 28 page

Grounding & Layout

Grounding and layout for the CS8130 are criti-

cal, because of the sensitive nature of the PIN

diode amplifier. The CS8130 should be over its

own dedicated ground plane. The PIN diode

should be very close to the PINA and PINC

pins. The PIN diode traces should be very short

(< 5 mm), and should be surrounded by ground

plane. There should be holes in the ground plane

provided for mounting a metal shield over the

CS8130 and the PIN diode for EMI shielding.

The PIN diode and transmit LEDs should be po-

sitioned so as to line up the front optical surfaces

of the packages. The optical surface of the PIN

diode and transmit LED(s) should be positioned

1cm back from the daylight IR filter window in-

side the case of the equipment. This ensures that

direct sunlight does not fall upon the top surface

of the PIN diode.

An evaluation kit, CDB8130, is available from

Crystal. This may be used as an example of the

correct layout for the CS8130 and the optical

components.

Optical Components

TEMIC (Tel: 408 970 5684) provides Telefunken

infrared LEDs and PIN diodes which are com-

patible with the CS8130. Contact Crystal for

details of additional qualified LED and PIN di-

ode sources.

Example Application Schematics

Crystal has prepared some example schematics

which demonstrate possible uses for the CS8130.

Figure 8 shows a computer or PDA motherboard

example, where one UART is used to drive both

a wired RS232 COM port and an IR port.

Figure 9 shows a pod schematic. This is an ex-

ternal unit which can be plugged into any

existing COM port to create an IR port.

Schematic & Layout Review Service

Confirm Optimum

Schematic & Layout

Before Building Your Board.

For Our Free Review Service

Call Applications Engineering.

Call: (512) 445-7222

CS8130

DS134PP2

CS8130

DS134F1

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