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ADS7949 Arkusz danych(PDF) 7 Page - Texas Instruments |
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ADS7949 Arkusz danych(HTML) 7 Page - Texas Instruments |
7 / 39 page ADS7947 ADS7948 ADS7949 www.ti.com SLAS708 – SEPTEMBER 2010 ELECTRICAL CHARACTERISTICS: ADS7949 (8-Bit) Minimum/maximum specifications at AVDD = 2.7V to 5.5V, DVDD = 1.65V to AVDD, TA = –40°C to +125°C, and fSAMPLE = 2MSPS, unless otherwise noted. Typical specifications at AVDD = 3V, DVDD = 1.8V, TA = +25°C, and fSAMPLE = 2MSPS. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ANALOG INPUT Full-scale input span(1) AINxP – AINxN 0 VREF V AIN0P, AIN1P –0.2 AVDD + 0.2 V Absolute input range AIN0N, AIN1N –0.2 0.2 V Input capacitance(2) 32 pF Input leakage current At +125°C 1.5 nA SYSTEM PERFORMANCE Resolution 8 Bits No missing codes 8 Bits Integral linearity –0.3 ±0.06 0.3 LSB(3) Differential linearity –0.3 ±0.06 0.3 LSB Offset error(4) –0.3 ±0.06 0.3 LSB Gain error –0.3 ±0.06 0.3 LSB Transition noise 25 µVRMS Power-supply rejection 60 dB SAMPLING DYNAMICS Conversion time 8.5 SCLK Acquisition time 80 ns Maximum sample rate (throughput rate) 34MHz SCLK in 16-clock frame 2 MSPS 34MHz SCLK and CS low for 8.5 clocks 3 MSPS Aperture delay 5 ns Aperture jitter 10 ps Step response 80 ns Overvoltage recovery 80 ns DYNAMIC CHARACTERISTICS Total harmonic distortion (THD)(5) 100kHz –80 dB Signal-to-noise ratio (SNR) 100kHz 49 dB Signal-to-noise and distortion ratio (SINAD) 100kHz 49 dB Spurious-free dynamic range (SFDR) 100kHz 81 dB Full-power bandwidth At –3dB 15 MHz DIGITAL INPUT/OUTPUT Logic family CMOS VIH 0.7DVDD V VIL 0.3DVDD V Logic level VOH ISOURCE = 200µA DVDD – 0.2 V VOL ISINK = 200µA 0.4 V Input leakage current IIH, IIL 0 <VIN < DVDD ±20 nA External reference 2.5 AVDD V (1) Ideal input span; does not include gain or offset error. (2) Refer to Figure 39 for sampling circuit details. (3) LSB means Least Significant Bit. (4) Measured relative to an ideal full-scale input. (5) Calculated on the first nine harmonics of the input frequency. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): ADS7947 ADS7948 ADS7949 |
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