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INA326EA/2K5 Datasheet(PDF) 16 Page - Texas Instruments |
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INA326EA/2K5 Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 21 page  INA326, INA327 16 SBOS222D www.ti.com FIGURE 16. Programmable ±5mA Current Source. FIGURE 17. ±27V Output at 200mA Amplifier with 100µV Offset. INA326 4 5 7 2 1 8 3 6 I O = ±5mA with 0.1 µA stability. +2.5V −2.5V I O 0.1 µF V REF = +2.5V R I = 200kΩ 10k Ω 49.9 Ω DAC R L I OUT = 2 V REF − VDAC 200k Ω 1 + 10k Ω 49.9 Ω INA326 4 4 5 7 7 2 1 8 3 2 3 6 6 +5V −30V +30V I B 10nF 2k Ω 1M Ω R I = 1kΩ 20k Ω V I 20k Ω R F = 100kΩ OPA551 Internal charge pump in the INA326 allows this node to swing 20mV below ground without a negative supply. Offset of the high- voltage op amp is controlled by the INA326. V O = –27V V OS = –100µV at 200mA G = − = −100V/V R F R I NOTES: (1) The OPA551 is a 60V op amp. (2) The INA326 does not require a negative supply to correct for negative VOS values from the high-voltage op amp. (3) Voltage offset contribution of IB (OPA551) is 100pA • 2kΩ = 0.2µV. |
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