Hi,
I'm designing an ultrasonic anemometer using 40khz transducers. There are 4 transducers driven single-ended. I'm currently using two L293D's hooked up to a uC to drive each transducer @ 12V/0V. It's working decently, but I'd like to drive the transducers +/- 12V instead of 12V/0V. Or maybe up to +/- 20V.
Can anyone recommend a 3.3v-controlled, dual-supply (+/- 18V) push-pull driver IC? It also needs to have tri-state/shutdown/hi-z mode so that each transducer can become a receiver. I've considered running the L293D from Vcc2=12V, Gnd=-12V and Vcc1=-7V, but then I'd have to bias each of the 8 control inputs, which would be a real pain. I'm currently able to drive the L293D's directly from the uC, which is nice.
Oh, and it would be really nice if they came in DIP
I've looked at a few op-amps, but most of them don't have a shutdown mode (and are a bit on the pricey side). A comparator -might- do the trick, but I haven't been able to find one that can run up to 35Vpp and also disable it's output. And all of the H-bridge drivers I've seen are designed for single-supply control.
Any recommendations or advice would be really appreciated!
I'm designing an ultrasonic anemometer using 40khz transducers. There are 4 transducers driven single-ended. I'm currently using two L293D's hooked up to a uC to drive each transducer @ 12V/0V. It's working decently, but I'd like to drive the transducers +/- 12V instead of 12V/0V. Or maybe up to +/- 20V.
Can anyone recommend a 3.3v-controlled, dual-supply (+/- 18V) push-pull driver IC? It also needs to have tri-state/shutdown/hi-z mode so that each transducer can become a receiver. I've considered running the L293D from Vcc2=12V, Gnd=-12V and Vcc1=-7V, but then I'd have to bias each of the 8 control inputs, which would be a real pain. I'm currently able to drive the L293D's directly from the uC, which is nice.
Oh, and it would be really nice if they came in DIP
I've looked at a few op-amps, but most of them don't have a shutdown mode (and are a bit on the pricey side). A comparator -might- do the trick, but I haven't been able to find one that can run up to 35Vpp and also disable it's output. And all of the H-bridge drivers I've seen are designed for single-supply control.
Any recommendations or advice would be really appreciated!