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INA338 Datasheet(PDF) 9 Page - Texas Instruments |
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INA338 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 14 page INA337, INA338 9 SBOS222A www.ti.com INA337 V O Filtered V O 6 G = 2(R 2/R1) f O = 1kHz R O 100 Ω C O (1) 1 µF R 2 C 2 (1) 7 V+ 4 0.1 µF V– 5 Single-Supply Operation IA COMMON (2) IA COMMON (2) INA337 R 1 R 1 V IN– V IN+ V O Filtered V O 6 2 1 8 3 G = 2(R 2/R1) f O = 1kHz R O 100 Ω C O (1) 1 µF R 2 C 2 (1) 7 +2.5V 4 0.1 µF –2.5V 5 Dual-Supply Operation NOTES: (1) C 2 and CO combine to form a 2-pole response that is –3dB at 1kHz. Each individual pole is at 1.5kHz. (2) Output voltage is referenced to IA COMMON (see text). NOTES: (1) C 2 and CO combine to form a 2-pole response that is –3dB at 1kHz. Each individual pole is at 1.5kHz. (2) Output voltage is referenced to IA COMMON (see text). (3) Output pedestal required for measurement near zero (see Figure 6). 1 8 V IN– V IN+ 2 3 (3) DESIRED R1 R2 || C2 GAIN ( Ω)(Ω || nF) 0.1 400k 20k || 5 0.2 400k 40k || 2.5 0.5 400k 100k || 1 1 400k 200k || 0.5 2 200k 200k || 0.5 5 80k 200k || 0.5 10 40k 200k || 0.5 20 20k 200k || 0.5 50 8k 200k || 0.5 100 4k 200k || 0.5 200 2k 200k || 0.5 500 2k 500k || 0.2 1000 2k 1M || 0.1 2000 2k 2M || 0.05 5000 2k 5M || 0.02 10000 2k 10M || 0.01 APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA337. A 0.1 µF capacitor, placed close to and across the power-supply pins is strongly recommended for highest accu- racy. RoCo is an output filter that minimizes auto-correction circuitry noise. This output filter may also serve as an anti- aliasing filter ahead of an Analog-to-Digital (A/D) converter. It is also optional based on desired precision. The output reference terminal is taken at the low side of R2 (IACOMMON). The INA337 uses a unique internal topology to achieve excel- lent common-mode rejection (CMR). Unlike conventional in- strumentation amplifiers, CMR is not affected by resistance in the reference connections. See “Inside the INA337” for further detail. To achieve best high-frequency CMR, minimize capaci- tance on pins 1 and 8. FIGURE 1. Basic Connections. NOTE: Connections for INA338 differ—see Pin Configuration for detail. SETTING THE GAIN The INA337 is a 2-stage amplifier with each stage gain set by R1 and R2, respectively (see Figure 4, “Inside the INA337", for details.) Overall gain is described by the equation: G R R = 2 2 1 (1) The stability and temperature drift of the external gain-setting resistors will affect gain by an amount that can be directly inferred from the gain equation (1). Resistor values for commonly used gains are shown in Figure 1. Gain-set resistor values for best performance are different for +5V single-supply and for ±2.5V dual-supply operation. Optimum value for R1 can be calculated by: R1 = VIN, MAX/12.5µA(2) where R1 must be no less than 2kΩ. DESIRED R1 R2 || C2 GAIN ( Ω)(Ω || nF) 0.1 400k 20k || 5 0.2 400k 40k || 2.5 0.5 400k 100k || 1 1 200k 100k || 1 2 100k 100k || 1 5 40k 100k || 1 10 20k 100k || 1 20 10k 100k || 1 50 4k 100k || 1 100 2k 100k || 1 200 2k 200k || 0.5 500 2k 500k || 0.2 1000 2k 1M || 0.1 2000 2k 2M || 0.05 5000 2k 5M || 0.02 10000 2k 10M || 0.01 |
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