ADC3683 datasheet(23/70 Pages) TI1

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7.3.3.2 External Voltage Reference (VREF)

For highest accuracy and lowest temperature drift, the VREF input can be directly connected to an external 1.6V

reference. A 10µF and a 0.1µF ceramic bypass capacitor (CVREF) connected between the VREF and REFGND

pins and placed as close to the pins as possible. The load current from the external reference is about 1mA.

Note

The internal reference is also used for other functions inside the device; therefore, the reference

amplifier should only be powered down in power down state but not during normal operation.

xINP

xINM

VREF

(1.6V)

REFBUF

(1.2V)

REFGND

VREF1.2

VCM

0.95V

x1.33

CVREF

Reference

1.6V

Figure 7-15. External 1.6V reference

7.3.3.3 External Voltage Reference with Internal Buffer (REFBUF)

The ADC3683-SP is equipped with an on-chip reference buffer that also includes gain to generate the 1.6V

reference voltage from an external 1.2V reference. A 10µF and a 0.1µF ceramic bypass capacitor (CVREF)

between the VREF and REFGND pins and a 10µF and a 0.1µF ceramic bypass capacitor between the REFBUF

and REFGND pins is recommended. Both capacitors should be placed as close to the pins as possible. The load

current from the external reference is less than 100µA.

xINP

xINM

VREF

(1.6V)

REFBUF

(1.2V)

REFGND

VREF1.2

VCM

0.95V

x1.33

CVREF

CREFBUF

Reference

1.2V

Figure 7-16. External 1.2V Reference Using Internal Reference Buffer

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ADC3683-SP

SBASAB5 – MARCH 2024

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