LMC7101_15 Datasheet, PDF (25/33 Pages) Texas Instruments – LMC7101, LMC7101Q-Q1 Tiny Low-Power Operational Amplifier With Rail-to-Rail Input and Output

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LMC7101, LMC7101Q-Q1
SNOS719G – SEPTEMBER 1999 – REVISED SEPTEMBER 2015
9 Power Supply Recommendations
For proper operation, the power supplies must be decoupled. For supply decoupling, TI recommends placing
10-nF to 1-µF capacitors as close as possible to the operational-amplifier power supply pins. For single supply
configurations, place a capacitor between the V⁺ and V^– supply pins. For dual supply configurations, place one
capacitor between V⁺ and ground, and place a second capacitor between V^– and ground. Bypass capacitors
must have a low ESR of less than 0.1 Ω.
10 Layout
10.1 Layout Guidelines
Care must be taken to minimize the loop area formed by the bypass capacitor connection between supply pins
and ground. A ground plane underneath the device is recommended; any bypass components to ground must
have a nearby via to the ground plane. The optimum bypass capacitor placement is closest to the corresponding
supply pin. Use of thicker traces from the bypass capacitors to the corresponding supply pins will lower the
power-supply inductance and provide a more stable power supply.
The feedback components must be placed as close as possible to the device to minimize stray parasitics.
10.2 Layout Example
Figure 68. LMC7101 Example Layout
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