Component Description Recommended Value

R1 Txd input resistor for transmitter peaking. 560 W ±5%, 0.125 watt

RLED (R2) LED bias resistor which sets LED current pulse 4.7 W ±5%, 0.5 watt (See Transmitter

amplitude. Drive Requirements Section)

R3 Power supply noise filter resistor. The higher the 10-50 W ±5%, 0.125 watt

value, the lower the minimum filter frequency.

1/(R3•CX5) is the minimum filter frequency.

CX1 PIN bypass capacitor to reduce noise at the PIN 0.47 mF, ±10%, X7R ceramic, <0.5 cm

detector. from pin 1.

CX2 Txd input capacitor for transmitter peaking. 220 pF, ±10%, X7R ceramic

CX3 Adaptive threshold capacitor. 1000 pF, ±10%, X7R ceramic

CX4 Adaptive threshold averaging capacitor. 0.010 mF, ±10%, X7R ceramic

CX5 VCC to Gnd bypass capacitor. Should be within 0.47 mF, ±20%, X7R ceramic, <0.5 cm

0.5 cm of module pins 2,4. lead length, within 0.5 cm from pins

2, 4.

CX6 VCC to Gnd bypass capacitor. 6.8 mF, Tantalum. Larger value

recommended for noisy supplies

or environments.

CX7 VCC transmitter bypass capacitor 0.47 mF, ceramic. Used to eliminate

ripple on VCC caused by the LED

current during infrared transmission.