Figure 9-6. DC Measurement With ADS1285 (VIN = 2.0796V )

9.3 Power Supply Recommendation

The REF54 family of references features a low-dropout voltage. These references can be operated with a supply

of only 250mV above the output voltage for 5mA output current conditions. TI recommends a supply bypass

capacitor ranging between 0.1µF to 10µF. REF54 family have excellent PSRR (100dB at 1Khz) which relaxes

the requirement of clean power supply for the designer.

During start-up the REF54 can experience moments of high input current due to the output capacitors. The input

current can momentarily rise to short circuit current ISC.

9.4 Layout

9.4.1 Layout Guidelines

• Place the power-supply bypass capacitor as close as possible to the supply and ground pins. The

recommended value of this bypass capacitor is from 0.1μF to 10μF. If necessary, additional decoupling

capacitance can be added to compensate for noisy or high-impedance power supplies. The smallest

capacitor must be placed closest to the device.

• The output must be decoupled with a 1μF to 100μF low ESR (maximum 1Ω) capacitor.

• Place a 1μF to 100μF low leakage noise filtering capacitor between the NR pin and ground.

9.4.2 Layout Example

Figure 9-7. Layout Example for SOIC package

REF54

SNVSCN7D – NOVEMBER 2023 – REVISED JUNE 2026

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