ADC3541 datasheet(25/68 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 1.6 V

reference. A 10 uF ceramic bypass capacitor (CVREF) connected between the VREF and REFGND pins and

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

mA.

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.

AINP

AINM

VREF

(1.6V)

REFBUF

(1.2V)

REFGND

VREF1.2

VCM

0.95V

x1.33

CVREF

Reference

1.6V

Figure 7-15. External 1.6 V reference

7.3.3.3 External voltage reference with internal buffer (REFBUF)

The ADC354x is equipped with an on-chip reference buffer that also includes gain to generate the 1.6V

reference voltage from an external 1.2 V reference. A 10 uF ceramic bypass capacitor (CVREF) between the

VREF and REFGND pins and a TBD ceramic bypass capacitor between the REFBUF and REFGND pins are

recommended. Both capacitors should be placed as close to the pins as possible. The load current from the

external reference is less than 100 uA.

AINP

AINM

VREF

(1.6V)

REFBUF

(1.2V)

REFGND

VREF1.2

VCM

0.95V

x1.33

CVREF

CREFBUF

Reference

1.2V

Figure 7-16. External 1.2 V reference using internal reference buffer

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ADC3541

SBAS840 – JULY 2020

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