Thursday, July 29, 2010

Dual Difference Amplifier with On-Chip Resistors Implements Precision ADC Driver

Discrete difference amplifiers exhibit mediocre accuracy, significant drift over temperature, poor CMR, and a small input voltage range. Monolithic diff amps have better CMR, but still suffer from gain drift due to the mismatch between on-chip devices and the external gain resistor.The AD8270 dual diff amp overcomes these limitations, providing a complete, inexpensive, high-performance solution.


At 9:59 AM, Anonymous Stephen Trier said...

I appreciate what you're trying to show here, but unfortunately Figure 2 and Figure 3 neither use the resistors provided on the AD8270 nor provide the functionality ascribed to them. Both figures are configured incorrectly for differential amplifiers and neither has the gain claimed. The fixes needed for Figure 2 can be seen by referring to Figure 48 of the AD8270 datasheet. I'm not sure what the intent is for Figure 3, but perhaps it's meant to be a differential amp, such as in the datasheet's Figure 42, followed by a single-ended amp with a configuration chosen from the datasheet's Table 8.

At 3:02 PM, Blogger Analog Dialogue said...

Thanks, Stephen. The correct version will be posted tomorrow.


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