Best performance and stability is attained with low-ESR, low-inductance ceramic chip-type output capacitors

(X5R, X7R, or similar). If using an electrolytic capacitor on the output, place a 0.1-μF ceramic capacitor in

parallel to reduce overall ESR on the output.

10.3.2.3 Selection of ADC

ADS7038 12-bit 8 channel multiplexed ADC is chosen for this application. The ADC offers low current operation

with averaging mode to increase the resolution to 16-bit with internal averaging modes while operating with slow

sampling speed.

10.3.3 Application Curves

Table 10-3 shows the captured measurement results for various DC inputs. The ADC output is captured and

analyzed for output accuracy, code spread and sigma with REF35500 as power supply vs LDO as power supply.

Table 10-3. DC Input Performance Test Results

INPUT V

REF35500

LDO

MEASURED V

CODE SPREAD

SIGMA

MEASURED V

CODE SPREAD

SIGMA

1.0 V

TBD V

TBD

TBD

TBD V

TBD

TBD

2.5 V

TBD V

TBD

TBD

TBD V

TBD

TBD

4 V

TBD V

TBD

TBD

TBD V

TBD

TBD

11 Power Supply Recommendations

The REF35 family of references feature an extremely low-dropout voltage. These references can be operated

with a supply of only 50 mV above the output voltage at no load. TI recommends a supply bypass capacitor

ranging between 0.1 µF to 10 µF.

REF35

SNAS809 – DECEMBER 2021

www.ti.com

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