參數(shù)資料
型號(hào)： TSA1204IFT-E
廠商： STMICROELECTRONICS
元件分類： ADC
英文描述： 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48
封裝： 7 X 7 MM, PLASTIC, TQFP-48
文件頁(yè)數(shù)： 8/31頁(yè)
文件大小： 435K
代理商： TSA1204IFT-E
Application information
TSA1204
16/31
8.2
References and common mode connection
VREFM must always be connected externally.
8.2.1
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).
Figure 23.
Internal reference and common mode setting
8.2.2
External reference and common mode
Each of the voltages VREFM, VREFP and INCM can be fixed externally to better fit to the
application needs (refer to Table 5: Operating conditions on page 7 for min/max values). It is
possible to use an external reference voltage device for specific applications requiring even
better linearity, accuracy or enhanced temperature behavior.
The VREFP and VREFM voltages set the analog dynamic range at the input of the converter
that has a full scale amplitude of 2*(VREFP-VREFM).
The INCM voltage is half the value of VREFP-VREFM.
The best linearity and distortion performance is achieved with a dynamic range above 2 Vpp
and by increasing the VREFM voltage instead of lowering the VREFP one.
To obtain the highest performance from the TSA1204 device, we recommend implementing
the configuration shown in Figure 24 with the STMicroelectronics TS821or TS4041-1.2 Vref.
Figure 24.
External reference setting
TSA1204
VIN
VINB VREFM
1.03V
VREFP
330pF
4.7
μF
10nF
INCM
330pF
4.7
μF
10nF
0.57V
1k
Ω
TSA1204
VIN
VINB
VREFM
VREFP
external
reference
VCCA
330pF
4.7
μF
10nF
TS821
TS4041
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