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ADS9813 Datasheet(PDF) 23 Page - Texas Instruments

Part # ADS9813
Description  ADS9813 18-Bit, 2MSPS, 8-Channel, Simultaneous-Sampling ADC With Integrated Analog Front-End
PDF  66 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS9813 Datasheet(HTML) 23 Page - Texas Instruments

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The CM voltage rejection circuit is configured depending on the analog input range of the PGA when using
single-ended inputs. Table 6-4 lists the recommended configuration for single-ended inputs for various analog
input voltage ranges.
Table 6-4. Wide Common-Mode Configuration for Single-Ended Inputs
PGA ANALOG
INPUT RANGE
CM_CTRL_EN
ANALOG INPUT CHANNELS 1–4
ANALOG INPUT CHANNELS 5–8
CM_EN_CH[4:1]
CM_RNG_CH[4:1]
CM_EN_CH[8:5]
CM_RNG_CH[8:5]
±2.5V, ±3.5V, and
±5V
1
0
Don't care
0
Don't care
±7V, ±10V, and ±12V
1
0
1
0
Typical SNR for analog input ranges vs input common-mode ranges are shown in Table 6-5 for low-bandwidth
mode and Table 6-6 for wide-bandwidth mode.
Table 6-5. Typical SNR (dBFS) for Analog Input Range vs Common-Mode Range in Low-Bandwidth Mode
RANGE
CM ≤ ±1V
CM ≤ ±RANGE / 2
CM ≤ ±6V
CM ≤ ±12V
±2.5V
88.3
87.4
85.2
83.4
±3.5V
88.3
88.4
87.0
85.4
±5V
90.1
89.1
88.4
87.2
±7V
–
89.8
89.4
88.5
±10V
–
90.2
90.2
89.5
±12V
–
90.3
90.3
89.9
Table 6-6. Typical SNR (dBFS) for Analog Input Range vs Common-Mode Range in Wide-Bandwidth
Mode
RANGE
CM ≤ ±1V
CM ≤ ±RANGE / 2
CM ≤ ±6V
CM ≤ ±12V
±2.5V
80.5
79.1
76.7
74.7
±3.5V
81.1
79.4
77.6
75.8
±5V
81.6
79.7
78.4
76.7
±7V
–
80.0
79.2
77.5
±10V
–
81.6
81.2
79.7
±12V
–
82.4
82.4
80.9
6.3.2 ADC Transfer Function
The ADS9813 outputs 18 bits of conversion data in either straight-binary or binary two's-complement formats.
The format for the output codes is the same across all analog channels. Select the format for the output
codes with the DATA_FORMAT register bits. Figure 6-3 and Table 6-7 show the transfer characteristics for the
ADS9813. The LSB size depends on the analog input range selected.
www.ti.com
ADS9813, ADS9811, ADS9810
SBASAQ6A – JULY 2024 – REVISED NOVEMBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: ADS9813 ADS9811 ADS9810



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