Hello everyone,
I have a TLV2242IP OpAmp. I took the pinout from https://www.digikey.in/en/htmldatasheets/production/27107/0/0/1/tlv2241idbvr
For the test, I connected the ground to pin 4, VCC +5V to pin 8, 2.5V supply to pin 2, square 5V signal to pin 3, and expected to see a square output signal on pin 1 but it didn’t work. I see 0 on the output. Same results on the other pins 5, 6, and 7
Can you help? I am missing something obvious here!
Thank you
Hi @NickS ,
Please specify your “square 5V signal to pin 3”
Please note: TLV2242 is an opamp, not a comparator.
Cheers, heke
Hello @NickS,
Oh no, I’ve made this mistake many times as I cross my metal model of logic circuits with op amps.
Positive supply to pin 7 not 8.
Sincerely,
Aaron
The pinout for TLV2242 (double OpAmp) says VCC is pin 8. Pin 7 is for TLV2241 (single)
The frequency is well below of what it should handle, a few KHz. Offset is 0
True, another mistake I’ve made with op amps.
Ref: TLV2241, TLV2242, TLV2244 by Texas Instruments Datasheet | DigiKey
Hi @NickS ,
Thanks. If your signal is 5vpp and offset 0, then it will never cross the reference 2.5V. Also the signal may swing outside the input range as you seem to have single supply configuration. That may cause permanent damage to your opamp, depending on your signal source.
Cheers, heke
Apologies, I misspoke, the offset is 2.5V (swing between ground and VCC)
Hello @NickS,
Is this your circuit?
Note that the simulated source swings between 1 and 4 VDC while the inverted output swings from 5 to 0 VDC.
Sincerely,
Aaron
Yes, that’s what it is supposed to do, but it doesn’t. I am inclined to think that the chips I got are simply defective. It never happened to me before, but I guess there is a first time for everything
