A/D converter

SteveD

I need an ADC capable of a 10 Volt span (-5VDC to +5VDC).· Does anyone have a recommendation?
Thanks,
Steve

Leon

You could use an ordinary unipolar ADC with a simple resistor network to convert the signal to a unipolar one.

Leon

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

Phil Pilgrim (PhiPi)

One problem with resistor networks is that they load the analog source, which will skew the results if the source has too high an output impedance. An ADC that handles non-logic-level inputs will have its own power and ground pins, usually labeled AVdd and AGnd. If you Google ADC AVdd AGnd, you will find some candidate devices.

-Phil

Tracy Allen

The MAX1270 is an 8-channel ADC that works on a single 5 volt supply, but has an input range of +/-5 volt. Also selectable, +/- 10 volt, and 0-5 and 0-10. However, it is like Phil says, one that uses a built-in resistor network at the input to achieve the extended ranges. The input impedance is low, around 10 or 20 kOhms, so the inputs have to be driven from a low impedance source like an op-amp buffer.

If you opt for a standard high impedance ADC, and if the required signal bandwidth is not too high, then you could do it with high value resistors in the 100k to 1M range.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Tracy Allen
www.emesystems.com