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INA105BM Datasheet(PDF) 5 Page - Texas Instruments |
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INA105BM Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 17 page  ® INA105 5 COMMON-MODE INPUT RANGE vs SUPPLY (Difference Amplifier Connected, V OUT = 0) Supply Voltage (V) ±3 36 30 24 18 12 6 0 ±6 ±9 ±12 ±15 ±18 ±21 Negative CMV Positive CMV POWER SUPPLY REJECTION vs FREQUENCY Frequency (Hz) 1 140 120 100 80 60 40 10 100 1k 10k 100k V– V+ TYPICAL PERFORMANCE CURVES (CONT) At TA = 25°C, VS = ±15V, unless otherwise noted. APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA105. Power supply bypass capacitors should be connected close to the device pins. The differential input signal is connected to pins 2 and 3 as shown. The source impedances connected to the inputs must be nearly equal to assure good common-mode rejection. A 5 Ω mismatch in source impedance will degrade the com- mon-mode rejection of a typical device to approximately 80dB. If the source has a known mismatch in source imped- ance, 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. This can be used to null offset voltage as shown in Figure 2. The source impedance of a signal applied to the Ref terminal should be less than 10 Ω to maintain good common-mode rejection. Do not interchange pins 1 and 3 or pins 2 and 5, even though nominal resistor values are equal. These resistors are laser trimmed for precise resistor ratios to achieve accurate gain and highest CMR. Interchanging these pins would not pro- vide specified performance. FIGURE 1. Basic Power Supply and Signal Connections. V 3 5 6 3 INA105 V OUT = V3 – V2 2 R 3 R 1 R 2 R 4 V 2 25k Ω 25k Ω 25k Ω 25k Ω 1µF V– 4 1µF V+ 7 1 |
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