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REF3312 Datasheet(PDF) 16 Page - Texas Instruments |
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REF3312 Datasheet(HTML) 16 Page - Texas Instruments |
16 / 32 page ±10 0 10 20 30 40 ±6 ±5 ±4 ±3 ±2 ±1 0 1 2 3 4 5 6 Input Voltage (V) C01 0.00 0.25 0.50 0.75 1.00 1.25 ±6 ±5 ±4 ±3 ±2 ±1 0 1 2 3 4 5 6 Input Voltage (V) C01 ±150 ±125 ±100 ±75 ±50 ±25 0 25 50 ±6 ±5 ±4 ±3 ±2 ±1 0 1 2 3 4 5 6 Input Voltage (V) C01 _ 3dB A1 6 2 1 f 0.144 Hz R 2 C 2 S § · ¨ ¸ © ¹ REF3312, REF3318, REF3320, REF3325, REF3330, REF3333 SBOS392E – AUGUST 2007 – REVISED OCTOBER 2014 www.ti.com (18) In applications that cannot tolerate such a low-frequency cutoff, and therefore a long start-up time, buffer the A1– input with another OPA317 to properly drive the ADC input with a lower-input capacitor. 10.2.1.2.7 Passive Component Tolerances and Materials Resistors R1, R2, R3, R4, R5, R6, and R7 directly affect the accuracy of the circuit. To meet the unadjusted accuracy goals of 0.2%, the resistors used are 0.1%. Select 0.1% resistors for the construction of the difference amplifier circuit to provide a common-mode rejection ratio (CMRR) of at least 60 dB. 10.2.1.3 Application Curves 10.2.1.3.1 DC Performance The measured dc performance and calculated error of the circuit is shown in Figure 20 and Figure 21, respectively. By applying a two-point gain and offset calibration over the specified ±5-V input range, the calibrated error is shown in Figure 22. The uncalibrated results show errors of 138 μV, or 0.0138%FSR. The calibrated results with a simple two-point calibration show errors under 5 μV, or 0.0005%FSR, in the specified input range of ±5 V. Figure 20. Measured DC Transfer Function with ±6-V Input Figure 21. Measured Output Error with ±6-V Input Figure 22. Calibrated Output Error with ±6-V Input 16 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated Product Folder Links: REF3312 REF3318 REF3320 REF3325 REF3330 REF3333 |
Similar Part No. - REF3312_15 |
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Similar Description - REF3312_15 |
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