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INA199A2 Datasheet(PDF) 11 Page - Texas Instruments |
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INA199A2 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 22 page  Output INA199Ax Load Supply ADC V+ OUT GND IN- IN+ C BYPASS 0.01mF to 0.1mF +2.7Vto+26V REF R 1 R 3 R 2 R 4 RSHUNT INA199Ax V+ OUT GND IN- IN+ C BYPASS Shutdown Control REF Reference Voltage Supply Load R SHUNT Output 1MW R PROTECT 10W R PROTECT 10W R 3 1MW R 4 INA199A1 INA199A2 INA199A3 www.ti.com SBOS469B – MAY 2009 – REVISED FEBRUARY 2010 REF INPUT IMPEDANCE EFFECTS USING THE INA199Ax WITH COMMON-MODE TRANSIENTS ABOVE 26V As with any difference amplifier, the INA199Ax series common-mode rejection ratio is affected by any With a small amount of additional circuitry, the impedance present at the REF input. This concern is INA199Ax series can be used in circuits subject to not a problem when the REF pin is connected directly transients higher than 26V, such as automotive to most references or power supplies. When using applications. Use only zener diode or zener-type resistive dividers from the power supply or a transient absorbers (sometimes referred to as reference voltage, the REF pin should be buffered by Transzorbs); any other type of transient absorber has an op amp. an unacceptable time delay. Start by adding a pair of resistors as shown in Figure 24 as a working In systems where the INA199Ax output can be impedance for the zener. It is desirable to keep these sensed differentially, such as by a differential input resistors as small as possible, most often around analog-to-digital converter (ADC) or by using two 10 Ω. Larger values can be used with an effect on separate ADC inputs, the effects of external gain that is discussed in the section on input filtering. impedance on the REF input can be cancelled. Because this circuit limits only short-term transients, Figure 23 depicts a method of taking the output from many applications are satisfied with a 10 Ω resistor the INA199Ax by using the REF pin as a reference. along with conventional zener diodes of the lowest power rating that can be found. This combination uses the least amount of board space. These diodes can be found in packages as small as SOT-523 or SOD-523. Figure 23. Sensing INA199Ax to Cancel Effects of Impedance on the REF Input Figure 24. INA199Ax Transient Protection Using Dual Zener Diodes Copyright © 2009–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): INA199A1 INA199A2 INA199A3 |
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