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INA333 Fiches technique(PDF) 14 Page - Texas Instruments |
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INA333 Fiches technique(HTML) 14 Page - Texas Instruments |
14 / 27 page GENERAL LAYOUT GUIDELINES 300W +3V 150W R (1) 1 2V V - D 2V+ V D 3V R G INA333 V O Ref 1.5V INPUT PROTECTION APPLICATION IDEAS INA333 R /2 G V O LA RL RA 10kW Ref G=10 2.8kW 2.8kW 1/2 OPA2333 390kW 390kW 1/2 OPA2333 INA333 SBOS445B – JULY 2008 – REVISED OCTOBER 2008 ..................................................................................................................................................... www.ti.com Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1 µF bypass capacitor closely across the supply pins. These guidelines should be applied throughout the analog circuit to improve performance and provide benefits such as reducing the electromagnetic-interference (EMI) susceptibility. (1) R1 creates proper common-mode voltage, only for low-voltage Instrumentation amplifiers vary in the susceptibility to operation—see the Single-Supply Operation section. radio-frequency interference (RFI). RFI can generally be identified as a variation in offset voltage or dc Figure 35. Single-Supply Bridge Amplifier signal levels with changes in the interfering RF signal. The INA333 has been specifically designed to minimize susceptibility to RFI by incorporating passive RC filters with an 8MHz corner frequency at The input terminals of the INA333 are protected with the VIN+ and VIN– inputs. As a result, the INA333 internal diodes connected to the power-supply rails. demonstrates remarkably low sensitivity compared to These diodes clamp the applied signal to prevent it previous generation devices. Strong RF fields may from damaging the input circuitry. If the input signal continue to cause varying offset levels, however, and voltage can exceed the power supplies by more than may require additional shielding. 0.3V, the input signal current should be limited to less than 10mA to protect the internal clamp diodes. This current limiting can generally be done with a series input resistor. Some signal sources are inherently Additional application ideas are shown in Figure 36 to current-limited and do not require limiting resistors. Figure 39. Figure 36. ECG Amplifier With Right-Leg Drive 14 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): INA333 |
Numéro de pièce similaire - INA333_15 |
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Description similaire - INA333_15 |
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