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MAX1365 Datasheet(PDF) 15 Page - Maxim Integrated Products |
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MAX1365 Datasheet(HTML) 15 Page - Maxim Integrated Products |
15 / 25 page Bipolar Mode Set EN_BPM high to engage bipolar operation. In bipo- lar mode, the current output at 4–20OUT (4–20mA or 0 to 16mA) maps the analog input voltage (±2V or ±200mV). In bipolar mode, a 0V analog input maps to midscale (12mA). See Table 5 for current output (see Figures 12 and 13). 5.2V Linear Regulator with Compensation The MAX1365/MAX1367 feature a 5.2V linear regulator. The 5.2V regulator consists of an op amp and connec- tions to an external depletion-mode FET. The 5.2V regu- lator regulates the loop voltage that powers the voltage-to-current converter and the rest of the trans- mitter circuitry. The regulator output voltage is available at REG_VDD and is given by the equation: VREG_VDD = 2.54 x VREF+ The FET breakdown and saturation voltages determine the usable range of loop voltages (VEXT). The external FET parameters such as VGS (off), IDSS, and transcon- ductance must be chosen so that the op amp output on the REG_FORCE pin can control the FET operating point while swinging in the range from VREG_AMP to REG_VDD. See the Selecting Depletion-Mode FET sec- tion in the Applications Information section. Connect a 0.1µF capacitor between CMP and REG_FORCE to ensure stable operation of the regulator. Applications Information Power-On Reset At power-on, the digital filter and modulator circuits reset. The MAX1365 allows 6s for the reference to sta- bilize before performing enhanced offset calibration. Stand-Alone, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ______________________________________________________________________________________ 15 CURRENT OUTPUT (mA) ANALOG INPUT UNIPOLAR MODE (EN_I = LOW) UNIPOLAR MODE (EN_I = HIGH) BIPOLAR MODE (EN_I = LOW) BIPOLAR MODE (EN_I = HIGH) Negative Full Scale 0 4 0 4 0V 0 4 8 12 Positive Full Scale 16 20 16 20 Table 5. Current Output Table MAX1365 MAX1367 AVDD DVDD 10 µF 10 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF ANALOG SUPPLY FERRITE BEAD RREF R R ACTIVE GAUGE DUMMY GAUGE REF+ REF- NEGV AIN+ AIN- 4-20OUT 4–20mA/0 TO 16mA CURRENT-LOOP OUTPUT GND 0.1 µF 0.1 µF Figure 6. Strain-Gauge Application with the MAX1365/MAX1367 |
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