ADS8681_16 Datasheet, PDF (7/74 Pages) Texas Instruments – 16-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges

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ADS8681, ADS8685, ADS8689
SBAS633B – FEBRUARY 2016 – REVISED DECEMBER 2016
Electrical Characteristics (continued)
all minimum and maximum specifications are at T_A = –40°C to +125°C; typical specifications are at T_A = 25°C; AVDD = 5 V,
DVDD = 3.3 V, V_REF = 4.096 V (internal), and maximum throughput (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
SYSTEM PERFORMANCE
Resolution
16
Bits
NMC
No missing codes
16
Bits
DNL
Differential nonlinearity⁽²⁾
All input ranges
–0.7
±0.4
0.7 LSB
All bipolar ranges⁽³⁾
–1.2
±0.5
1.2
INL
Integral nonlinearity⁽²⁾
E_O
Offset error⁽⁵⁾
All unipolar
ranges ⁽⁴⁾
At T_A = 25°C
ADS8681
ADS8685, ADS8689
All bipolar ranges⁽³⁾
All unipolar ranges⁽⁴⁾
–1.5
±0.5
–1.2
±0.5
–1
±0.2
–2
±0.2
1.5 LSB
1.2
1
mV
2
Offset error drift with temperature
All input ranges
–3 ±0.75
3 ppm/°C
E_G
Gain error⁽⁶⁾
At T_A = 25°C, all input ranges
Gain error drift with temperature⁽⁷⁾
All input ranges
–0.025
–5
±0.01
±1
0.025 %FSR
5 ppm/°C
DYNAMIC CHARACTERISTICS
Input range = ^ADS8681
±3 × V_REF
ADS8685, ADS8689
90.25
92
90.5
92
Input range = ^ADS8681
±2.5 × V_{REF ADS8685, ADS8689}
90.25
92
90.5
92
SNR
THD
Signal-to-noise ratio⁽⁸⁾
Total harmonic distortion⁽⁹⁾⁽⁸⁾
Input range = ±1.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 3 × V_REF
Input range = 2.5 × V_REF
Input range = 1.5 × V_REF
Input range = 1.25 × V_REF
All input
ranges
ADS8681
ADS8685, ADS8689
89.5
91.5
89.5
91.5
dB
87.75
90
89.25
91
89
91
88
90
87.5
90
–107
dB
–112
Input range = ^ADS8681
±3 × V_REF
ADS8685, ADS8689
90.15
92
90.4
92
Input range = ^ADS8681
±2.5 × V_{REF ADS8685, ADS8689}
90.15
92
90.4
92
SINAD
SFDR
Signal-to-noise + distortion⁽⁸⁾
Spurious-free dynamic range⁽⁸⁾
Input range = ±1.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 3 × V_REF
Input range = 2.5 × V_REF
Input range = 1.5 × V_REF
Input range = 1.25 × V_REF
All input
ranges
ADS8681
ADS8685, ADS8689
89.4
91.5
89.4
91.5
dB
87.65
90
89
91
88.75
91
87.75
90
87.25
90
109
dB
114
(2) This specification indicates the endpoint INL, not best-fit INL.
(3) Bipolar ranges are ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V.
(4) Unipolar ranges are 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 V.
(5) Measured relative to actual measured reference.
(6) Excludes internal reference accuracy error.
(7) Excludes internal reference temperature drift.
(8) All specifications expressed in decibels (dB) refer to the full-scale input (FSR) and are tested with a 1-kHz input signal 0.25 dB below
full-scale, unless otherwise specified.
(9) Calculated on the first nine harmonics of the input frequency.
Copyright © 2016, Texas Instruments Incorporated
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