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

must have a low ESR of less than 0.1 Ω.

10 Layout

10.1 Layout Guidelines

Take care 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 should 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 should be placed as close to the device as possible to minimize stray parasitics.

10.2 Layout Example

+3.3V

+3

.3V

GND

+3.3V

1

+3.3V

2

+3.3V

1

V+

2

V+

3

V+

2

GND

1

VOUT

2

GND

5

+3.3V

+3.3V

+3.3V

VOUT

4

V–

1

GND

GND

1

GND

2

VOUT

2

VOUT

1

V–

1

V–

2

V–

GND

G

N

D

V+

Figure 10-1. LMP7704-SP Example Layout for a Single Channel

LMP7704-SP

SNOSDB6A – DECEMBER 2020 – REVISED JANUARY 2021

www.ti.com

26

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