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ADS1113 Datasheet(PDF) 13 Page - Texas Instruments

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Part # ADS1113
Description  ADS111x-Q1 Automotive, Low-Power, I2C-Compatible, 860-SPS, 16-Bit ADCs With Internal Reference, Oscillator, and Programmable Comparator
PDF  50 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS1113 Datasheet(HTML) 13 Page - Texas Instruments

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7 Parameter Measurement Information
7.1 Noise Performance
Delta-sigma (ΔΣ) analog-to-digital converters (ADCs) are based on the principle of oversampling. The input
signal of a ΔΣ ADC is sampled at a high frequency (modulator frequency) and subsequently filtered and
decimated in the digital domain to yield a conversion result at the respective output data rate. The ratio between
modulator frequency and output data rate is called oversampling ratio (OSR). By increasing the OSR, and
thus reducing the output data rate, the noise performance of the ADC can be optimized. In other words, the
input-referred noise drops when reducing the output data rate because more samples of the internal modulator
are averaged to yield one conversion result. Increasing the gain also reduces the input-referred noise, which is
particularly useful when measuring low-level signals.
Table 7-1 and Table 7-2 summarize the ADS111x-Q1 noise performance. Data are representative of typical noise
performance at TA = 25°C with the inputs shorted together externally. Table 7-1 shows the input-referred noise
in units of μVRMS for the conditions shown. The µVPP values are shown in parenthesis. Table 7-2 shows the
effective resolution calculated from μVRMS values using Equation 1. The noise-free resolution calculated from
peak-to-peak noise values using Equation 2 are shown in parenthesis.
Effective Resolution = ln (FSR / VRMS-Noise) / ln(2)
(1)
Noise-Free Resolution = ln (FSR / VPP-Noise) / ln(2)
(2)
Table 7-1. Noise in μVRMS (μVPP) at VDD = 3.3 V
DATA RATE
(SPS)
FSR (Full-Scale Range)
±6.144 V
±4.096 V
±2.048 V
±1.024 V
±0.512 V
±0.256 V
8
187.5 (187.5)
125 (125)
62.5 (62.5)
31.25 (31.25)
15.62 (15.62)
7.81 (7.81)
16
187.5 (187.5)
125 (125)
62.5 (62.5)
31.25 (31.25)
15.62 (15.62)
7.81 (7.81)
32
187.5 (187.5)
125 (125)
62.5 (62.5)
31.25 (31.25)
15.62 (15.62)
7.81 (7.81)
64
187.5 (187.5)
125 (125)
62.5 (62.5)
31.25 (31.25)
15.62 (15.62)
7.81 (7.81)
128
187.5 (187.5)
125 (125)
62.5 (62.5)
31.25 (31.25)
15.62 (15.62)
7.81 (12.35)
250
187.5 (252.09)
125 (148.28)
62.5 (84.03)
31.25 (39.54)
15.62 (16.06)
7.81 (18.53)
475
187.5 (266.92)
125 (227.38)
62.5 (79.08)
31.25 (56.84)
15.62 (32.13)
7.81 (25.95)
860
187.5 (430.06)
125 (266.93)
62.5 (118.63)
31.25 (64.26)
15.62 (40.78)
7.81 (35.83)
Table 7-2. Effective Resolution from RMS Noise (Noise-Free Resolution from Peak-to-Peak Noise) at
VDD = 3.3 V
DATA RATE
(SPS)
FSR (Full-Scale Range)
±6.144 V
±4.096 V
±2.048 V
±1.024 V
±0.512 V
±0.256 V
8
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
32
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
64
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
128
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (15.33)
250
16 (15.57)
16 (15.75)
16 (15.57)
16 (15.66)
16 (15.96)
16 (14.75)
475
16 (15.49)
16 (15.13)
16 (15.66)
16 (15.13)
16 (14.95)
16 (14.26)
860
16 (14.8)
16 (14.9)
16 (15.07)
16 (14.95)
16 (14.61)
16 (13.8)
www.ti.com
ADS1113-Q1, ADS1114-Q1, ADS1115-Q1
SBAS563E – DECEMBER 2011 – REVISED DECEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: ADS1113-Q1 ADS1114-Q1 ADS1115-Q1



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