RHF1201 STMICROELECTRONICS [STMicroelectronics], RHF1201 Datasheet - Page 12

• Manufacturer Part Number: RHF1201
• Description: Rad-hard 12-bit 0.5 to 50 Msps A/D converter
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Application information
7.3
7.3.1
7.3.2
12/18
Reference connection
Internal reference
In the standard configuration, the ADC is biased with the internal reference voltage. The
V
1.0 V. It is recommended to de-couple the V
frequency noise. Refer to
Figure 6.
External reference
It is possible to use an external reference voltage instead of the internal one for specific
applications requiring even better linearity or enhanced temperature behavior. In this case,
the amplitude of the external voltage must be at least equal to the internal one (1.0 V). You
can use an external voltage reference with the configuration shown in
reference setting
Figure 7.
This can be very helpful in multichannel applications for example to maintain a good
matching along the sampling frequency range.
REFM
pin is connected to Analog Ground while V
Internal reference setting
External reference setting
to obtain optimum performance.
VIN
VINB
Figure 6: Internal reference setting
RHF1201
VCCA
VINB
1kΩ
VIN
RHF1201
VREFM
VREFP
~1V
VREFM
VREFP
external
reference
REFP
in order to minimize low and high
REFP
330pF
330pF
is internally set to a voltage close to
10nF
10nF
for the schematics.
470nF
470nF
Figure 7: External
RHF1201