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SDM862R Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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SDM862R Datasheet(HTML) 9 Page - Burr-Brown (TI) |
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9 / 27 page  ® SDM862/863/872/873 9 Matching of R1 and R3 is required to maintain high common-mode rejection (CMR), R2 sets the gain and may be varied without effect on CMR. To ensure that the effects of temperature are minimized when altering the gain with external components, it is very important to use low tempco resistors. When connecting the output sense, ensure that series resistance is minimized because resistance present will degrade CMR. FIGURE 5. Increasing Output Amplifier Gain. 20k 20k Ω Ω 4.44k Ω 404 Ω FET Input 10k Ω 10k Ω 10k Ω 10k Ω FET Input A1 A3 A2 R1 R2 R3 FIGURE 4. Use External Gain Set Resistor. – + – + + – + – C f + – R f MUX CM –V +V C f C f R f C f R f C f 10V 10V R f R i R f R f FIGURE 3. Example Application Illustrating Flexible Signal Conditioning. Output 20k 20k Ω Ω X10 X100 4.44k Ω 404 Ω FET Input 10k Ω 10k Ω 10k Ω 10k Ω FET Input +In R G R EXT –In A1 A3 A2 Sense Ref Where it is necessary to keep the input amplifiers from saturating or increasing the overall gain, then the gain of the output amplifier can be increased from unity by using the circuit in Figure 5. The values of the resistors in Figure 5 are in the following table. O/P GAIN R1 and R3 Ω R2 Ω 2 1200 2740 5 1000 511 10 1500 340 FIGURE 6. Typical INA Settling Time and CMR. 10 100 1 1k 10k 100k 1M 120 100 80 60 40 20 0 Frequency (Hz) Gain (V/V) 1 10 100 10 5 0 CMR vs FREQUENCY SETTLING TIME vs GAIN (0.01%, 20V Step) Gain = 1 Gain = 10 Gain = 100 |
Similar Part No. - SDM862R |
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Similar Description - SDM862R |
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