10 Layout

10.1 Layout Guidelines

Comparators are very sensitive to input noise. For best results, adhere to the following layout guidelines.

1. Use a printed-circuit-board (PCB) with a good, unbroken, low-inductance ground plane. Proper grounding

(use of a ground plane) helps maintain specified device performance.

2. To minimize supply noise, place a decoupling capacitor (0.1-μF ceramic, surface-mount capacitor) as close

3. On the inputs and the output, keep lead lengths as short as possible to avoid unwanted parasitic feedback

around the comparator. Keep inputs away from the output.

4. Solder the device directly to the PCB rather than using a socket.

5. For slow-moving input signals, take care to prevent parasitic feedback. A small capacitor (1000 pF or less)

placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes some

degradation to propagation delay when impedance is low. The topside ground plane runs between the output

and inputs.

6. Use a 100 Ω termination resistor across the device's LVDS output.

7. Use higher performance substrate materials such as Rogers.

8. Below is the pcb signal layers from the TLV3604EVM as reference:

10.2 Layout Example

Figure 10-1 shows the 4 layer pcb signal routing for the TLV3604EVM as an example for how layout on this

device can be done.

TLV3604EVM Layout Example

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TLV3604

SNOSDA2A – AUGUST 2020 – REVISED AUGUST 2020

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