RHF1401_12 STMICROELECTRONICS [STMicroelectronics], RHF1401_12 Datasheet - Page 32

• Manufacturer Part Number: RHF1401_12
• Description: Rad-hard 14-bit 30 Msps A/D converter
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

User manual
Note:
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Figure 59. External voltage reference setting
VIN
VINB
REFMODE
VCCA
*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
VREFP
VREFM
INCM
/2. Higher levels introduce more distortion.
As close as possible
to the ADC pins
100 nF*
100 nF*
470 nF*
470 nF*
Doc ID 13317 Rev 8
source
source
DC
DC
AM04575
Figure 60. Example with zeners
VINB
VIN
REFMODE
VCCA
As close as possible
As close as possible
to the ADC pins
to the ADC pins
VREFP
VREFM
INCM
100 nF*
100 nF*
100 nF*
100 nF*
R
R1
R2
RHF1401
470 nF*
470 nF*
470 nF*
470 nF*
AM04576