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ADS7945SRTER Datasheet(PDF) 3 Page - Texas Instruments |
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ADS7945SRTER Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 50 page  ADS7945 ADS7946 www.ti.com SBAS539B – JUNE 2011 – REVISED SEPTEMBER 2011 ELECTRICAL CHARACTERISTICS: ADS7945 (Differential) Minimum/maximum specifications at TA = –40°C to +125°C, AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to AVDD, input common-mode = VREF/2 ± 0.2, and fSAMPLE = 2 MSPS, unless otherwise noted. Typical specifications at TA = +25°C, AVDD = 5 V, DVDD = 1.8 V, input common-mode = VREF/2 ± 0.2, and fSAMPLE = 2 MSPS. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ANALOG INPUT Full-scale input span(1) AINxP – AINxN –VREF VREF V AIN0P, AIN1P –0.2 AVDD + 0.2 V Absolute input range AIN0N, AIN1N –0.2 AVDD + 0.2 V Input common-mode range(2) (AINxP + AINxN)/2 VREF/2 ± 0.2 V Input capacitance(3) 32 pF Input leakage current At +125 °C 1.5 nA SYSTEM PERFORMANCE Resolution 14 Bits No missing codes 14 Bits Integral linearity –1.5 ±0.8 1.5 LSB(4) Differential linearity –1 ±0.8 1.5 LSB Offset error(5) –4 ±1.5 4 LSB Gain error –4 ±1.5 4 LSB Transition noise 25 µVRMS Power-supply rejection With 500 Hz sine wave on AVDD 60 dB SAMPLING DYNAMICS Conversion time 16 SCLK Acquisition time 80 ns Maximum sample rate (throughput rate) 40 MHz SCLK with a 16-clock frame 2 MSPS Aperture delay(6) 10 ns Aperture jitter(6) 10 ps Step response(6)(3) 80 ns DYNAMIC CHARACTERISTICS Total harmonic distortion (THD)(7) 20 kHz, VREF = 4.0 V –92 dB 20 kHz, VREF = 4.0 V 82 84 dB Signal-to-noise ratio (SNR) 100 kHz, VREF = 4.0 V 83 dB Signal-to-noise and distorion ratio (SINAD) 20 kHz, VREF = 4.0 V 83.5 dB Spurious-free dynamic range (SFDR) 20 kHz, VREF = 4.0 V 94 dB Full-power bandwidth(8) At –3 dB 15 MHz (1) Ideal input span; does not include gain or offset error. (2) Refer to the Input Common-Mode Range section in Application Information. (3) Refer to Figure 76 for sampling circuit details. (4) LSB means least significant bit. (5) Measured relative to an ideal full-scale input. (6) Ensured by simulation. (7) Calculated on the first nine harmonics of the input frequency. (8) Indicates signal bandwidth for undersampling applications. Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): ADS7945 ADS7946 |
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