tsa1204 STMicroelectronics, tsa1204 Datasheet - Page 16

• Manufacturer Part Number: tsa1204
• Description: Dual-channel, 12-bit, 20msps, 120mw A/d Converter
• Manufacturer: STMicroelectronics

Application information
8.2
8.2.1
8.2.2
16/31
References and common mode connection
VREFM must always be connected externally.
Internal reference and common mode
In the default configuration, the ADC operates with its own reference and common mode
voltages generated by its internal bandgap. It is recommended to decouple the VREFP and
INCM pins in order to minimize low and high frequency noise (see
Figure 23. Internal reference and common mode setting
External reference and common mode
Each of the voltages V
application needs (refer to
possible to use an external reference voltage device for specific applications requiring even
better linearity, accuracy or enhanced temperature behavior.
The V
that has a full scale amplitude of 2*(V
The INCM voltage is half the value of V
The best linearity and distortion performance is achieved with a dynamic range above 2 V
and by increasing the V
To obtain the highest performance from the TSA1204 device, we recommend implementing
the configuration shown in
Figure 24. External reference setting
REFP
and V
TSA1204
REFM
VIN
VINB
VCCA
TSA1204
VIN
VINB VREFM
REFM
voltages set the analog dynamic range at the input of the converter
REFM
1kΩ
1.03V
VREFM
VREFP
Table 5: Operating conditions on page 7
Figure 24
VREFP
, V
voltage instead of lowering the V
INCM
REFP
330pF
TS4041
0.57V
and INCM can be fixed externally to better fit to the
TS821
330pF
with the STMicroelectronics TS821or TS4041-1.2 Vref.
REFP
REFP
external
reference
10nF
-V
10nF
330pF
-V
REFM
REFM
4.7μF
4.7μF
).
10nF
.
4.7μF
REFP
Figure
for min/max values). It is
one.
23).
TSA1204
pp