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INA132PA Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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INA132PA Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 9 page 7 ® INA132 APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA132. 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. An 8 Ω mismatch in source impedance will degrade the com- mon-mode rejection of a typical device to approximately 80dB. Gain accuracy will also be slightly affected. If the source has a known impedance mismatch, an additional resistor in series with one input can be used to preserve 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. As shown in Figure 1, measure- ments should be sensed at the load. supply ground). Although input voltages on pins 2 and 3 that are below the negative supply voltage will not damage the device, operation in this region is not recommended. Transient conditions at the inverting input terminal below the negative supply can cause a positive feedback condition that could lock the INA132’s output to the negative rail. The INA132 can accurately measure differential signals that are above the positive power supply. Linear common-mode range extends to nearly twice the positive power supply voltage—see typical performance curve, Common-Mode Range vs Output Voltage. OFFSET VOLTAGE TRIM The INA132 is laser trimmed for low offset voltage and drift. Most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the output offset voltage. 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. The source impedance of a signal applied to the Ref terminal should be less than 8 Ω to maintain good common-mode rejection. To assure low impedance at the Ref terminal, the trim voltage can be buffered with an op amp, such as the OPA177. CAPACITIVE LOAD DRIVE CAPABILITY The INA132 can drive large capacitive loads, even at low supplies. It is stable with a 10,000pF load. Refer to the “Small-Signal Step Response” and “Settling Time vs Load Capacitance” typical performance curves. FIGURE 1. Basic Power Supply and Signal Connections. OPERATING VOLTAGE The INA132 operates from single (+2.7V to +36V) or dual ( ±1.35V to ±18V) supplies with excellent performance. Specifications are production tested with +5V and ±15V supplies. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary signifi- cantly with operating voltage are shown in the typical performance curves. The internal op amp in the INA132 is a single-supply design. This allows linear operation with the op amp’s common- mode voltage equal to, or slightly below V– (or single FIGURE 2. Offset Adjustment. V 3 5 6 3 V O INA132 V O = V3 – V2 Offset Adjustment Range = ±500µV 2 R 3 Ref R 1 R 2 R 4 V 2 8 Ω R = 237k Ω 8 Ω 100k Ω +15V –15V 1 NOTE: For ±750µV range, R = 158k Ω. V 3 5 6 3 INA132 V OUT = V3 – V2 2 R 3 Ref R 1 R 2 R 4 V 2 40k Ω 40k Ω 40k Ω 40k Ω R L 1µF V– 4 1µF V+ 7 1 |
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