INA826 Precision, 200-µA Supply Current, 3-V to 36-V Supply Instrumentation Amplifier with Rail-to-Rail Output (Rev. F)
SBOS562F – August2011 – revisedJuly 2016
11.1 Layout Guidelines
Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible. Place 0.1-μF bypass capacitors close to the supply pins. Apply these guidelines throughout the analog circuit to improve performance and provide benefits such as reducing the electromagnetic-interference (EMI) susceptibility.
11.1.1 CMRR vs Frequency
The INA826 pinout is optimized for achieving maximum CMRR performance over a wide range of frequencies. However, care must be taken to ensure that both input paths are well-matched for source impedance and capacitance to avoid converting common-mode signals into differential signals. In addition, parasitic capacitance at the gain-setting pins can also affect CMRR over frequency. For example, in applications that implement gain switching using switches or PhotoMOS® relays to change the value of RG, choose the component so that the switch capacitance is as small as possible.
11.2 Layout Example
The INA826EVM provides the following features:
- Intuitive evaluation with silkscreen schematic
- Easy access to nodes with surface-mount test points
- Advanced evaluation with two prototype areas
- Reference voltage source flexibility
- Convenient input and output filtering
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