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INA169-Q1 Datasheet(PDF) 5 Page - Texas Instruments |
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INA169-Q1 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 12 page  INA139Q1,INA169Q1 SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004 www.ti.com 5 TYPICAL CHARACTERISTICS (CONTINUED) Typical characteristics are at TA = +25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted. STEP RESPONSE 20 µs/div 1.5V G =100 0.5V 1V G =100 0V STEP RESPONSE 10 µs/div 1V G =50 0V 2V G =10 0V APPLICATION INFORMATION Figure 1 illustrates the basic circuit diagram for both the INA139 and INA169. Load current IS is drawn from supply VS through shunt resistor RS . The voltage drop in shunt resistor VS is forced across RG1 by the internal op amp, causing current to flow into the collector of Q1. External resistor RL converts the output current to a voltage, VOUT, at the OUT pin. The transfer function for the INA139 is: IO = gm (VIN+ − VIN−) where gm = 1000 µA/V. In the circuit of Figure 1, the input voltage (VIN+ − VIN−) is equal to IS x RS and the output voltage (VOUT) is equal to IO x RL. The transconductance (gm) of the INA139 is 1000 µA/V. The complete transfer function for the current measurement amplifier in this application is: VOUT = (IS) (RS) (1000 µA/V) (RL) The maximum differential input voltage for accurate measurements is 0.5 V, which produces a 500- µA output current. A differential input voltage of up to 2 V will not cause damage. Differential measurements (pins 3 and 4) must be unipolar with a more-positive voltage applied to pin 3. If a more-negative voltage is applied to pin 3, the output current, IO, will be zero, but it will not cause damage. |
Similar Part No. - INA169-Q1 |
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Similar Description - INA169-Q1 |
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