Voltage Reference Options - Analog Devices ADuCM355 Hardware Reference Manual

UG-1262

VOLTAGE REFERENCE OPTIONS

The ADC features internal 1.82 V and 2.5 V voltage reference sources, as shown in Figure 14.
AFECON[5]
VOLTAGE
REFERENCES
AVDD
HIGH POWER DAC
BUFFER
1.82V ANALOG
LDO
AFECON[20]
HIGH POWER ADC
BUFFER
1.1V INTERNAL
HIGH POWER
PRECISION
BANDGAP
BUFSENCON[0]
LOW POWER ADC
BUFFER
BUFSENCON[2]
LOW POWER
BUFFER
0.92V
LOW POWER
BANDGAP
LPREFBUFCON[1]
LPREFBUFCON[0]
Figure 14. ADC Voltage Reference Options
ADuCM355
1.82V FOR
VREF_OUT
1.82V
REFERENCE
BUFSENCON[8]
FOR ADC
HIGH POWER 1.11V
BUFFER
BUFSENCON[4]
1.82V REFERENCE
FOR ADC
LOW POWER 1.11V
BUFFER
BUFSENCON[5]
2.5V REFERENCE
FOR LOW POWER BLOCK
Rev. B | Page 66 of 312
Hardware Reference Manual
AIN3/
BUF_VREF1V8
1.11V FOR ADC
INPUT BIAS
ADCVBIAS_CAP
0.47µF
VREF_1.82V
0.47µF
VREF_2.5V
0.47µF