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i tested as per the circuit given in datasheet but i didn't get any modulated signal, even i used pull up resistor also
As it happens I am about to build a 'people counter' (another thread) using this TSOP.
https://www.farnell.com/datasheets/1809228.pdf
with a TSAL6100 pair of emitters.
I should start the physical build tonite or tomorrow. I'll be able to advise on how it goes for the OP.
I am running a 39.2Khz PWM, 50% DC as the common anode carrier (8Mhz PIC clk, I could OSCTUNE for exactly 38Khz) and I am using a 500 uSec interrupt to alternate (50% DC) IR emitter pulse bursts from 2 PIC pins by pulling to ground. I am going direct from the PIC pins to the IR emitters so I will have to current limit @ under 25mA. If the range isn't sufficient I'll have to add transistor drives for more TX current. I need about 3' range.
Nigel: I see your tut page mentions a IR driver transistor. What is the current pulse that you use?
Well I got the TSOp working etc. BUT the AGC makes it very hard to calibrate a reflective trigger for objects passing by the TX & RX. Gotta get a TSOP without the AGC I guess.