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ADS8668 Datasheet(PDF) 8 Page - Texas Instruments |
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ADS8668 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 79 page  ADS8664, ADS8668 SBAS492 – JULY 2015 www.ti.com Electrical Characteristics (continued) Minimum and maximum specifications are at TA = –40°C to 125°C. Typical specifications are at TA = 25°C. AVDD = 5 V, DVDD = 3 V, VREF = 4.096 V (internal), and fSAMPLE = 500 kSPS, unless otherwise noted. TEST PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LEVEL(1) DYNAMIC CHARACTERISTICS Input range = ±2.5 × VREF 73 73.85 A Input range = ±1.25 × VREF 73 73.85 A Input range = ±0.625 × VREF 73 73.85 A Input range = ±0.3125 × VREF 72.7 73.5 A Signal-to-noise ratio SNR Input range = ±0.15625 × VREF 71.4 72.5 dB A (VIN – 0.5 dBFS at 1 kHz) Input range = 2.5 × VREF 73 73.85 A Input range = 1.25 × VREF 73 73.85 A Input range = 0.625 × VREF 72.7 73.5 A Input range = 0.3125 × VREF 71.4 72.5 A Total harmonic distortion(6) THD All input ranges –95 dB B (VIN – 0.5 dBFS at 1 kHz) Input range = ±2.5 × VREF 73 73.8 A Input range = ±1.25 × VREF 73 73.8 A Input range = ±0.625 × VREF 73 73.8 A Input range = ±0.3125 × VREF 72.7 73.5 A Signal-to-noise ratio SINAD Input range = ±0.15625 × VREF 71.4 72.5 dB A (VIN – 0.5 dBFS at 1 kHz) Input range = 2.5 × VREF 73 73.8 A Input range = 1.25 × VREF 73 73.8 A Input range = 0.625 × VREF 72.7 73.5 A Input range = 0.3125 × VREF 71.4 72.5 A Spurious-free dynamic range SFDR All input ranges 97 dB B (VIN – 0.5 dBFS at 1 kHz) Aggressor channel input overdriven Crosstalk isolation(7) 110 dB B to 2 × maximum input voltage Aggressor channel input overdriven Crosstalk memory(8) 90 dB B to 2 × maximum input voltage BW(–3 dB) Small-signal bandwidth, –3 dB At TA = 25°C, all input ranges 15 kHz B BW(–0.1 dB) Small-signal bandwidth, –0.1 dB At TA = 25°C, all input ranges 2.5 kHz B AUXILIARY CHANNEL Resolution 12 Bits A V(AUX_IN) AUX_IN voltage range (AUX_IN – AUX_GND) 0 VREF V A AUX_IN 0 VREF V A Operating input range AUX_GND 0 V A During sampling 75 pF C Ci Input capacitance During conversion 5 pF C IIkg(in) Input leakage current 100 nA A DNL Differential nonlinearity –0.5 ±0.2 0.5 LSB A INL Integral nonlinearity –0.75 ±0.5 0.75 LSB A EG(AUX) Gain error At TA = 25°C ±0.02 ±0.2 %FSR A EO(AUX) Offset error At TA = 25°C –5 5 mV A SNR Signal-to-noise ratio V(AUX_IN) = –0.5 dBFS at 1 kHz 73.2 73.7 dB A THD Total harmonic distortion(6) V(AUX_IN) = –0.5 dBFS at 1 kHz –90 dB B SINAD Signal-to-noise + distortion V(AUX_IN) = –0.5 dBFS at 1 kHz 72.5 73.5 dB A SFDR Spurious-free dynamic range V(AUX_IN) = –0.5 dBFS at 1 kHz 93 dB B (6) Calculated on the first nine harmonics of the input frequency. (7) Isolation crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel, not selected in the multiplexing sequence, and measuring its effect on the output of any selected channel. (8) Memory crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel that is selected in the multiplexing sequence, and measuring its effect on the output of the next selected channel for all combinations of input channels. 8 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: ADS8664 ADS8668 |
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