THS4521-HT_15 Datasheet, PDF (21/27 Pages) Texas Instruments – VERY LOW POWER, NEGATIVE RAIL INPUT,RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

THS4521-HT
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LAYOUT RECOMMENDATIONS
SBOS548D – APRIL 2011 – REVISED MAY 2012
It is recommended to follow the layout of the external components near to the amplifier, ground plane
construction, and power routing as closely as possible. Follow these general guidelines:
1. Signal routing should be direct and as short as possible into and out of the op amp circuit.
2. The feedback path should be short and direct.
3. Ground or power planes should be removed from directly under the amplifier input and output pins.
4. An output resistor is recommended in each output lead, placed as near to the output pins as possible.
5. Two 0.1-μF power-supply decoupling capacitors should be placed as near to the power-supply pins as
possible.
6. Two 10-μF power-supply decoupling capacitors should be placed within 1 inch of the device and can be
shared among multple analog devices.
7. A 0.22-μF capacitor should be placed between the V_OCM input pin and ground near to the pin. This capacitor
limits noise coupled into the pin.
8. The PD pin uses TTL logic levels; a bypass capacitor is not necessary if actively driven, but can be used for
robustness in noisy environments whether driven or not.
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