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LMV7219

SNOS458I – APRIL 2000 – REVISED JUNE 2016

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9 Power Supply Recommendations

has the required headroom to the positive rail V+. The input range extends to slightly below V- voltage. Supplies

should be decoupled with low inductance, often ceramic, capacitors to ground less than 0.5 inches from the

device pins. The use of ground plane is recommended, and as in most high speed devices, it is advisable to

remove ground plane close to device sensitive pins such as the inputs.

10 Layout

10.1 Layout Guidelines

10.1.1 Circuit Layout and Bypassing

The LMV7219 requires high-speed layout. Follow these layout guidelines:

1. Power supply bypassing is critical, and will improve stability and eliminate possible output chatter. A

used with dual supplies) as shown in Figure 20. An additional 2.2-µF tantalum capacitor may be required for

extra noise reduction.

2. Keep all leads short to reduce stray capacitance and lead inductance. It will also minimize unwanted parasitic

feedback around the comparator.

3. The device should be soldered directly to the PC board instead of using a socket.

4. Use a PC board with a good, unbroken low inductance ground plane as shown in Figure 20. Make sure

ground paths are low-impedance, especially were heavier currents are flowing.

5. Input traces should be kept away from output traces. This can be achieved by running a topside ground

plane between the output and inputs.

6. Run the ground trace under the device up to the bypass capacitor to shield the inputs from the outputs.

7. To prevent parasitic feedback when input signals are slow-moving, a small capacitor of 1000 pF or less can

be placed between the inputs. It can also help eliminate oscillations in the transition region. However, this