MC145026

•MC145027•MC145028•SC41343•SC41344

MOTOROLA

17

10 k

Ω

220 k

Ω

SEND

TE

9

RS

CTC

RTC

MC145026

SWITCHES

100 k

Ω FOR APPROX. 4 kHz

47 k

Ω FOR APPROX. 9 kHz

1000 pF

Dout

MC14011UB

MC14011UB

220 k

Ω

0.01

µF

SELECT FOR

200 mA TO 300 mA

MLED81

USE OF 2 MLED81s

IS OPTIONAL

MPSA13

OR

MPSW13

ADJUST/SELECT FOR

f = 50 kHz (APPROX. 100 k

Ω)

Figure 18. IRED Transmitter Using RC Oscillator to Generate Carrier Frequency

V+

V+

50 kHZ TO

DRIVER

TRANSISTOR

X1 = 400 kHz CERAMIC RESONATOR

PANASONIC EFD–A400K04B

OR EQUIVALENT

MC14024

CLK

X1

470 pF

MC14011UB

Dout

FROM MC145026

1M

Ω

470 pF

Q3

Figure 19. Using a Ceramic Resonator to Generate Carrier Frequency

RESET

V+

MC14011UB