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AD7851 Datasheet(PDF) 3 Page - Analog Devices |
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AD7851 Datasheet(HTML) 3 Page - Analog Devices |
3 / 36 page –3– REV. B AD7851 A Grade: fCLKIN = 7 MHz (–40 C to +85 C), fSAMPLE = 333 kHz; K Grade: fCLKIN = 6 MHz (0 C to 85 C), fSAMPLE = 285 kHz; A and K Grade: fCLKIN = 5 MHz (to 125 C), fSAMPLE = 238 kHz; (AVDD = DVDD = 5.0 V 5%, REFIN/REFOUT = 4.096 V External Reference; SLEEP = Logic High; TA = TMIN to TMAX, unless otherwise noted.) Parameter Version A 1 Version K 1 Unit Test Conditions/Comments DYNAMIC PERFORMANCE Signal-to-Noise + Distortion Ratio 3 (SNR) 77 78 dB min Typically SNR Is 79.5 dB. VIN = 10 kHz, Sine Wave, fSAMPLE = 333 kHz. Total Harmonic Distortion (THD) –86 –86 dB max VIN = 10 kHz, Sine Wave, fSAMPLE = 333 kHz, typically –96 dB. Peak Harmonic or Spurious Noise –87 –87 dB max VIN = 10 kHz, fSAMPLE = 333 kHz. Intermodulation Distortion (IMD) Second-Order Terms –86 –90 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 333 kHz. Third-Order Terms –86 –90 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 333 kHz. Full Power Bandwidth 20 20 MHz typ @ 3 dB. DC ACCURACY Resolution 14 14 Bits Integral Nonlinearity ±2 ±1 LSB max Differential Nonlinearity ±2 ±1 LSB max Guaranteed No Missed Codes to 14 Bits Unipolar Offset Error ±10 ±10 LSB max Review: Adjusting the Offset Calibration Positive Full-Scale Error ±10 ±10 LSB max Register in the Calibration Registers section. Negative Full-Scale Error ±10 ±10 LSB typ Bipolar Zero Error ±1 ±1 LSB typ ANALOG INPUT Input Voltage Ranges 0 V to VREF 0 V to VREF V AIN(+) – AIN(–) = 0 V to VREF, AIN(–) can be biased up but AIN(+) cannot go below AIN(–). ±V REF/2 ±V REF/2 V AIN(+) – AIN(–) = –VREF/2 to +VREF/2, AIN(–) should be biased up and AIN(+) can go below AIN(–) but cannot go below 0 V. Leakage Current ±1 ±1 µA max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REFIN Input Voltage Range 4/VDD 4/VDD V min/max Functional from 1.2 V. Input Impedance 150 150 k Ω typ Resistor Connected to Internal Reference Node. REFOUT Output Voltage 3.696/4.496 3.696/4.496 V min/max REFOUT Temperature Coefficient 50 50 ppm/ °C typ LOGIC INPUTS Input High Voltage, VINH VDD – 1.0 VDD – 1.0 V min Input Low Voltage, VINL 0.4 0.4 V max Input Current, IIN ±10 ±10 µA max VIN = 0 V or VDD. Input Capacitance, CIN 4 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH VDD – 0.4 VDD – 0.4 V min ISOURCE = 200 µA. Output Low Voltage, VOL 0.4 0.4 V max ISINK = 0.8 mA. Floating State Leakage Current ±10 ±10 µA max Floating State Output Capacitance 4 10 10 pF max Output Coding Straight (Natural) Binary Unipolar Input Range. Twos Complement Bipolar Input Range. CONVERSION RATE Conversion Time 2.78 3.25 µs max 19.5 CLKIN Cycles. Conversion + Track-and-Hold Acquisition Time 3.0 3.5 µs max 21 CLKIN Cycles Throughput Rate. SPECIFICATIONS1, 2 |
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