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ADS7822PC Datasheet(PDF) 3 Page - Texas Instruments |
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ADS7822PC Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 31 page  www.ti.com ELECTRICAL CHARACTERISTICS: +VCC = +2.7V ADS7822 SBAS062C – JANUARY 1996 – REVISED AUGUST 2007 At –40 °C to +85°C, +V CC = +2.7V, VREF = +2.5V, fSAMPLE = 75kHz, and fCLK = 16 × fSAMPLE, unless otherwise noted. ADS7822 ADS7822B ADS7822C PARAMETER TEST CONDITIONS UNIT MIN TYP MAX MIN TYP MAX MIN TYP MAX ANALOG INPUT Full-scale input span +In – (–In) 0 VREF 0 VREF 0 VREF V +In – GND –0.2 VCC + 0.2 –0.2 VCC + 0.2 –0.2 VCC + 0.2 V Absolute input range –In – GND –0.2 +1.0 –0.2 +1.0 –0.2 +1.0 V Capacitance 25 25 25 pF Leakage current ±1 ±1 ±1 μA SYSTEM PERFORMANCE Resolution 12 12 12 Bits No missing codes 11 12 11 Bits Integral linearity error –2 ±0.5 +2 –1 ±0.5 +1 –0.75 ±0.25 +0.75 LSB (1) Differential linearity error –2 ±0.5 +2 –1 ±0.5 +1 –0.75 ±0.25 +0.75 LSB Offset error –3 +3 –3 +3 –1 +1 LSB Gain error –3 +3 –3 +3 –1 +1 LSB Noise 33 33 33 μVrms Power-supply rejection 82 82 82 dB SAMPLING DYNAMICS Conversion time 12 12 12 Clk Cycles Acquisition time 1.5 1.5 1.5 Clk Cycles Throughput rate 75 75 75 kHz DYNAMIC CHARACTERISTICS Total harmonic distortion VIN = 2.5VPP at 1kHz –82 –82 –82 dB SINAD VIN = 2.5VPP at 1kHz 71 71 71 dB Spurious-free dynamic range VIN = 2.5VPP at 1kHz 86 86 86 dB REFERENCE OUTPUT Voltage range 0.05 VCC 0.05 VCC 0.05 VCC V CS = GND, fSAMPLE = 0Hz 5 5 5 G Ω Resistance CS = VCC 5 5 5 G Ω At code 710h 8 40 8 40 8 40 μA Current drain fSAMPLE = 7.5kHz 0.8 0.8 0.8 μA CS = VCC 0.001 3 0.001 3 0.001 3 μA DIGITAL INPUT/OUTPUT Logic family CMOS CMOS CMOS VIH IIH = +5μA 2.0 5.5 2.0 5.5 2.0 5.5 V VIL IIL = +5μA –0.3 0.8 –0.3 0.8 –0.3 0.8 V Logic levels VOH IOH = –250μA 2.1 2.1 2.1 V VOL IOL = 250μA 0.4 0.4 0.4 V Data format Straight Binary Straight Binary Straight Binary POWER-SUPPLY REQUIREMENTS Specified performance 2.7 3.6 2.7 3.6 2.7 3.6 V VCC See Notes (2) and (3) 2.0 2.7 2.0 2.7 2.0 2.7 V See Note (3) 2.7 3.6 2.7 3.6 2.7 3.6 V fSAMPLE = 7.5kHz (4) (5) 20 20 20 μA Quienscent current fSAMPLE = 75kHz (5) 200 325 200 325 200 325 μA Power down CS = VCC 3 3 3 μA TEMPERATURE RANGE Specified performance –40 +85 –40 +85 –40 +85 °C (1) LSB means least significant bit. With VREF equal to +2.5V, one LSB is 0.61mV. (2) The maximum clock rate of the ADS7822 is less than 1.2MHz in this power-supply range. (3) See the Typical Characteristics for more information. (4) fCLK = 1.2MHz, CS = VCC for 145 clock cycles out of every 160. (5) See the Power Dissipation section for more information regarding lower sample rates. Copyright © 1996–2007, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): ADS7822 |
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