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Part Number: DRV595
I am using DRV595 to drive TEC. In the datasheet, it says "To use the DRV595 with a single-ended source, use a voltage divider to bias IN- to 3.0V, and apply the single-ended signal to IN+." Is there a reason why it needs to be specifically biased at 3V? Will it be okay to bias IN- to 1.25V and apply the single-ended signal to IN+?
In reply to Shawn Zheng:
In reply to Fred Huettig:
Hi Shawn, excellent point about the reduced input range when biasing away from mid-scale, thank you. In our case even with the lowest gain (10x) we should have plenty of margin as we only need +/-4V output, so with IN- at 1.25V then IN+ only needs to swing between 0.85 and 1.65. Based on your update I think we're OK. It wouldn't be terrible to add some offset & gain to work with a 3V midpoint, but this circuit is replicated 4 times per board so if there's no need for extra parts we'd rather not add them. Thanks again. -Fred
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