AM26LV32E: Example Application Circuit for Line Receiver

Nicholas Wood

Part Number: AM26LV32E

Hi,

I currently have 3 differential pairs that need to be made single-ended (0-3.3V) before entering my microcontroller. Each differential pair is +/- 3.3V, respectively. Is there a sample circuit or application note for the AM26LV32E that illustrates this conversion from differential pair to single-ended?

8 months ago

0 Clemens Ladisch 8 months ago

Guru 256980 points

Differential receivers work like comparators; they compare the voltages at the two inputs. Just connect the two signals to the two inputs.

In general, you use a termination resistor (once, at the end of the bus) that matches the cable's characteristic impedance to avoid reflections at high-speed signal edges. For very low speeds and when you do not care about EMI, you can omit the resistor.

0 Nicholas Wood 8 months ago

Prodigy 100 points

Thanks, Clemens. I'm mostly concerned with G and G_BAR. Can these be pulled High and Low, respectively? Additionally, can unused pins float? See schematic below:

+1 Parker Dodson 8 months ago in reply to Nicholas Wood

TI__Mastermind 45397 points

Hi Nicholas,

G can be pulled to VCC and /G can be pulled to GND as shown without issue - it will keep the device always active. You can technically leave either G or /G floating - as both are connected to an internal OR gate - so only 1 input needs to be defined - but using both as shown is no issue.

For unused inputs you can leave them floating on this device. The A/B pins are open fail-safe because they are weakly biased (A to VCC and B to GND) so leaving them floating would create a "high" output on the corresponding Y pin. So yes you can leave them floating.

Please let me know if you have any other questions!

Best,

Parker Dodson

0 Nicholas Wood 8 months ago in reply to Parker Dodson

Prodigy 100 points

Thanks, Parker.

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AM26LV32E: Example Application Circuit for Line Receiver