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ADS8699IPWR 数据表(PDF) 32 Page - Texas Instruments

部件名 ADS8699IPWR
功能描述  ADS869x 18-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System With Programmable, Bipolar Input Ranges
PDF  74 Pages
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制造商  TI2 [Texas Instruments]
网页  https://www.ti.com
标志 TI2 - Texas Instruments

ADS8699IPWR 数据表(HTML) 32 Page - Texas Instruments

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7.3.8 ADC Transfer Function
The device supports a pseudo-differential input supporting both bipolar and unipolar input ranges. The output of
the device is in straight-binary format for both bipolar and unipolar input ranges.
The ideal transfer characteristic for all input ranges is shown in Figure 7-15. The full-scale range (FSR) for each
input signal is equal to the difference between the positive full-scale (PFS) input voltage and the negative full-
scale (NFS) input voltage. The LSB size is equal to FSR / 218 . For a reference voltage of VREF = 4.096 V, the
LSB values corresponding to the different input ranges are listed in Table 7-4.
00001h
3FFFFh
20000h
FSR ± 1 LSB
FSR / 2
1 LSB
Analog Input
(AIN_P ± AIN_GND)
NFS
PFS
Figure 7-15. Device Transfer Function (Straight-Binary Format)
Table 7-4. ADC LSB Values for Different Input Ranges (VREF = 4.096 V)
INPUT RANGE
POSITIVE FULL-SCALE
(V)
NEGATIVE FULL-SCALE
(V)
FULL-SCALE RANGE
(V)
LSB
±3 × VREF
12.288
–12.288
24.576
93.75 µV
±2.5 × VREF
10.24
–10.24
20.48
78.125 µV
±1.5 × VREF
6.144
–6.144
12.288
46.875 µV
±1.25 × VREF
5.12
–5.12
10.24
39.06 µV
±0.625 × VREF
2.56
–2.56
5.12
19.53 µV
0 to 3 × VREF
12.288
0
12.288
46.875 µV
0 to 2.5 × VREF
10.24
0
10.24
39.06 µV
0 to 1.5 × VREF
6.144
0
6.144
23.43 µV
0 to 1.25 × VREF
5.12
0
5.12
19.53 µV
ADS8691, ADS8695, ADS8699
SBAS777B – DECEMBER 2016 – REVISED MARCH 2021
www.ti.com
32
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: ADS8691 ADS8695 ADS8699



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