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ADS7871IDB Datasheet(PDF) 3 Page - Texas Instruments |
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ADS7871IDB Datasheet(HTML) 3 Page - Texas Instruments |
3 / 46 page ADS7871 SLAS370C − APRIL 2002 − REVISED OCTOBER 2004 www.ti.com 3 ELECTRICAL CHARACTERISTICS For the Total System (1), −40 °C ≤ TA ≤ 85°C, VDD = 5 V, BUFIN = 2.5 V (using external reference), 2.5-MHz CCLK and 2.5-MHz SCLK (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Analog Input Input voltage (LNx inputs) Linear operation −0.2 VDD + 0.2 V Input capacitance (2) 4 9.7 pF Input impedance (2) Common mode 6 M Ω Input impedance (2) Differential 7 M Ω Channel-to-channel crosstalk VI = 2 VPP, 60 Hz (3) 100 dB Maximum leakage current 100 pA Static Accuracy Resolution 14 Bits No missing codes G = 1 to 20 V/V 13 Bits Integral linearity G = 1 to 20 V/V −4 ±2 4 LSB Differential linearity G = 1 to 20 V/V −2 ±0.5 4 LSB Offset error G = 1 to 20 V/V −24 ±1 24 LSB Ratiometric configuration or (4) G = 1 to 10 V/V −0.2 0.2 %FSR Full-scale gain error Ratiometric configuration or external reference (4) G = 16 and 20 V/V −0.25 0.25 %FSR Full-scale gain error Internal reference G = 1 to 10 V/V −0.35 0.35 %FSR Internal reference G = 16 and 20 V/V −0.4 0.4 %FSR DC common-mode rejection ratio, RTI VI = −0.2 V to 5.2 V, G = 20 V/V 80 dB Power supply rejection ratio, RTI VDD = 5 V ±10%, G = 20 V/V 88 dB Dynamic Characteristics Throughput rate Continuous mode One channel 48 ksample/s Throughput rate Address mode Different channels 48 ksample/s External clock, CCLK (5) 0.1 20 MHz Internal oscillator frequency 2.5 MHz Serial interface clock, SCLK 20 MHz Data setup time 10 ns Data hold time 10 ns Digital Inputs Low-level input voltage, VIL 0.8 V High-level input voltage, VIH VDD ≤ 3.6 V 2 V Logic levels High-level input voltage, VIH VDD > 3.6 V 3 V Logic levels Low-level input current, IIL 1 A High-level input current, IIH 1 µA (1) The specifications for the total system are overall analog input to digital output specifications. The specifications for internal functions indicate the performance of the individual functions in the ADS7871. (2) The ADS7871 uses switched capacitor techniques for the programmable gain amplifier and A/D converter. A characteristic of such circuits is that the input capacitance at any selected LNx pin changes during the conversion cycle. (3) One channel on with its inputs grounded. All other channels off with sinewave voltage applied to their inputs. (4) Ratiometric configuration exists when the input source is configured such that changes in the reference cause corresponding changes in the input voltage. The same accuracy applies when a perfect external reference is used. (5) The CCLK is divided by the DF value specified by the contents of register 3, A/D Control register, bits D0 and D1 to produce DCLK. The maximum value of DCLK is 2.5 MHz. |
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