13

TP2311/TP2312 / TP2314

10MHz Bandwidth, Low Noise Precision Op-amps

www.3peakic.com.cn

Rev. A04

A variation in temperature across the PCB can cause a mismatch in the Seebeck voltages at solder joints and other

points where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple

effects, orient resistors so heat sources warm both ends equally. Input signal paths should contain matching numbers

and types of components, where possible to match the number and type of thermocouple junctions. For example,

dummy components such as zero value resistors can be used to match real resistors in the opposite input path.

Matching components should be located in close proximity and should be oriented in the same manner. Ensure leads

are of equal length so that thermal conduction is in equilibrium. Keep heat sources on the PCB as far away from

amplifier input circuitry as is practical.

The use of a ground plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a

constant temperature across the circuit board.