RHF1401_12 Datasheet, PDF (32/42 Pages) STMicroelectronics – Rad-hard 14-bit 30 Msps A/D converter

User manual
RHF1401
Figure 59. External voltage reference setting Figure 60. Example with zeners
As close as possible
to the ADC pins
VCCA
VIN
VREFP
100 nF* 470 nF*
VINB
INCM
REFMODE VREFM
100 nF* 470 nF*
DC
source
DC
source
AM04575
As close as possible
to the ADC pins
R1 R2
VCCA
VIN
VREFP
100 nF*
VINB
INCM
REFMODE VREFM
100 nF*
470 nF*
470 nF*
AM04576
Note:
*The use of ceramic technology is preferable to ensure large bandwidth stability of the
capacitor.
In multi-channel applications, the high impedance input (when REFMODE = 1) of the
references allows one to drive several ADCs with only two voltage reference devices.
In Differential mode the voltage of the analog input common mode (INCM) should be around
V_REFP/2. Higher levels introduce more distortion.
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Doc ID 13317 Rev 8