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INA106KP Datasheet(PDF) 5 Page - Texas Instruments |
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INA106KP Datasheet(HTML) 5 Page - Texas Instruments |
5 / 13 page INA106 5 SBOS152A www.ti.com TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. POWER SUPPLY REJECTION vs FREQUENCY Frequency (Hz) 140 120 100 80 60 40 1 10 100 1k 10k 100k V– V+ CMR vs FREQUENCY Frequency (Hz) 110 100 90 80 70 60 10 100 1k 10k 100k APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA106. Power supply bypass capacitors should be connected close to the device pins as shown. FIGURE 1. Basic Power Supply and Signal Connections. The differential input signal is connected to pins 2 and 3 as shown. The source impedance connected to the inputs must be equal to assure good common-mode rejection. A 5 Ω mismatch in source impedance will degrade the common- mode rejection of a typical device to approximately 86dB. If the source has a known source impedance mismatch, an additional resistor in series with one input can be used to preserve good common-mode rejection. The output is referred to the output reference terminal (pin 1) which is normally grounded. A voltage applied to the Ref terminal will be summed with the output signal. The source impedance of a signal applied to the Ref terminal should be less than 10 Ω to maintain good common-mode rejection. Figure 2 shows a voltage applied to pin 1 to trim the offset voltage of the INA106. The known 100 Ω source impedance of the trim circuit is compensated by the 10 Ω resistor in series with pin 3 to maintain good CMR. V 2 25 6 INA106 V OUT = 10(V3 –V2) 1 R 4 100k Ω V 3 R 1 10k Ω R 3 10k Ω 3 R 2 100k Ω 1µF V– 1µF V+ 47 + – FIGURE 2. Offset Adjustment. V 2 25 6 INA106 V O 1 R 4 R 1 R 3 3 R 2 499k Ω 100 Ω 100k Ω +15V –15V V 3 10 Ω V O = V2 – V3 Offset Adjustment Range = ±3mV Compensates for some impedance at pin 1. See text. Referring to Figure 1, the CMR depends upon the match of the internal R4/R3 ratio to the R1/R2 ratio. A CMR of 106dB requires resistor matching of 0.005%. To maintain high CMR over temperature, the resistor TCR tracking must be better than 2ppm/ °C. These accuracies are difficult and expensive to reliably achieve with discrete components. |
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