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ADS7891IPFBT Datasheet(PDF) 3 Page - Texas Instruments |
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ADS7891IPFBT Datasheet(HTML) 3 Page - Texas Instruments |
3 / 31 page ADS7891 SLAS410 − DECEMBER 2003 www.ti.com 3 SPECIFICATIONS TA = −40°C to 85°C, +VA = 5 V, +VBD = 5 V or 3.3 V, Vref = 2.5 V, fsample = 3 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-scale input span(1) +IN – (−IN) 0 Vref V Absolute input range +IN −0.2 Vref + 0.2 V Absolute input range −IN −0.2 +0.2 V Input capacitance 27 pF Input leakage current 500 pA SYSTEM PERFORMANCE Resolution 14 Bits No missing codes 14 Bits Integral linearity(2) −1.5 ±0.75 1.5 LSB(3) Differential linearity −1 ±0.75 1.5 LSB(3) Offset error(4) External reference −1.5 ±0.2 1.5 mV Gain error(4) External reference −1 ±0.2 1 mV Common-mode rejection ratio With common mode input signal = 200 mVp−p at 1 MHz 60 dB Power supply rejection At 3FF0H output code, +VA = 4.75 V to 5.25 V , Vref = 2.50 V 80 dB SAMPLING DYNAMICS Conversion time +VDB = 5 V 255 273 nsec Conversion time +VDB = 3 V 273 nsec Acquisition time +VDB = 5 V 60 78 nsec Acquisition time +VDB = 3 V 60 nsec Maximum throughput rate 3 MHz Aperture delay 2 nsec Aperture jitter 20 psec Step response 50 nsec Over voltage recovery 50 nsec DYNAMIC CHARACTERISTICS (5) VIN = 2.496 Vp−p at 100 kHz/2.5 Vref −93 Total harmonic distortion(5) VIN = 2.496 Vp−p at 1 MHz/2.5 Vref −88.5 −87 dB Total harmonic distortion(5) VIN = 2.496 Vp−p at 1.4 MHz/2.5 Vref −79.5 dB VIN = 2.496 Vp−p at 100 kHz/2.5 Vref 78.5 SNR VIN = 2.496 Vp−p at 1 MHz/2.5 Vref 78 dB SNR VIN = 2.496 Vp−p at 1.4 MHz/2.5 Vref 75 dB VIN = 2.496 Vp−p at 100 kHz/2.5 Vref 78 SINAD VIN = 2.496 Vp−p at 1 MHz/2.5 Vref 77 dB SINAD VIN = 2.496 Vp−p at 1.4 MHz/2.5 Vref 73.8 dB SFDR VIN = 2.496 Vp−p at 1 MHz/2.5 Vref 88 90 dB −3 dB Small signal bandwidth 50 MHz EXTERNAL REFERENCE INPUT Input VREF range 2.4 2.5 2.6 V Resistance(6) 500 k Ω (1) Ideal input span; does not include gain or offset error. (2) This is endpoint INL, not best fit. (3) LSB means least significant bit. (4) Measured relative to actual measured reference. (5) Calculated on the first nine harmonics of the input frequency. (6) Can vary ±20%. |
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