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ADS8661 Datasheet(PDF) 6 Page - Texas Instruments |
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ADS8661 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 71 page 6 ADS8661, ADS8665 SBAS780 – DECEMBER 2016 www.ti.com Product Folder Links: ADS8661 ADS8665 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Electrical Characteristics (continued) all minimum and maximum specifications are at TA = –40°C to +125°C; typical specifications are at TA = 25°C; AVDD = 5 V, DVDD = 3.3 V, VREF = 4.096 V (internal), and maximum throughput (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT (2) This specification indicates the endpoint INL, not best-fit INL. (3) Measured relative to actual measured reference. (4) Bipolar ranges are ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V. (5) Unipolar ranges are 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 V. (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. SYSTEM PERFORMANCE Resolution 12 Bits NMC No missing codes 12 Bits DNL Differential nonlinearity(2) All input ranges –0.35 ±0.1 0.35 LSB INL Integral nonlinearity(2) All input ranges –0.35 ±0.15 0.35 LSB EO Offset error(3) At TA = 25°C All bipolar ranges(4) –1 ±0.2 1 mV All unipolar ranges(5) –2 ±0.2 2 Offset error drift with temperature All input ranges –3 ±0.75 3 ppm/°C EG Gain error(6) At TA = 25°C, all input ranges –0.025 ±0.01 0.025 %FSR Gain error drift with temperature(7) All input ranges –5 ±1 5 ppm/°C DYNAMIC CHARACTERISTICS SNR Signal-to-noise ratio(8) All input ranges 73 73.5 dB THD Total harmonic distortion(9)(8) All input ranges –102 dB SINAD Signal-to-noise + distortion(8) All input ranges 72.9 73.4 dB SFDR Spurious-free dynamic range(8) All input ranges 103 dB SAMPLING DYNAMICS tCONV Conversion time ADS8661 550 ns ADS8665 1000 tACQ Acquisition time ADS8661 250 ns ADS8665 1000 fcycle Maximum throughput rate without latency ADS8661 1250 kSPS ADS8665 500 INTERNAL REFERENCE OUTPUT VREFIO On the REFIO pin (configured as an output) At TA = 25°C TSSOP (PW) 4.095 4.096 4.097 V WQFN (RUM) 4.094 4.096 4.098 dVREFIO/dTA Internal reference temperature drift TSSOP (PW) 4 ppm/°C WQFN (RUM) 5 COUT_REFIO Decoupling capacitor on REFIO pin 4.7 µF VREFCAP Reference voltage to the ADC (on the REFCAP pin) At TA = 25°C 4.095 4.096 4.097 V REFCAP temperature drift 0.5 2 ppm/°C COUT_REFCAP Decoupling capacitor on REFCAP pin 10 μF Turn-on time COUT_REFCAP = 10 µF, COUT_REFIO = 10 µF 20 ms EXTERNAL REFERENCE INPUT VREFIO_EXT External reference voltage on REFIO REFIO pin configured as an input 4.046 4.096 4.146 V AVDD COMPARATOR VTH_HIGH High threshold voltage 5.3 V VTH_LOW Low threshold voltage 4.7 V |
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