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INA156 Datasheet(PDF) 10 Page - Texas Instruments |
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INA156 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page 10 ® INA156 FIGURE 6. Input Offset Voltage Changes with Common- Mode Voltage. FIGURE 7. Single-Supply, High-Side Current Monitor. FIGURE 8. Input Current Protection for Voltages Exceed- ing the Supply Voltage. FIGURE 9. Driving Capacitive-Input A/D Converter. INPUT COMMON-MODE RANGE The input common-mode range of the INA156 for various operating conditions is shown in the Typical Performance Curves. The common-mode input range is limited by the output voltage swing of A1, an internal circuit node. For the G = 10 configuration, output voltage of A1 can be expressed as: VOUTA1 = – 1/9VREF + (1 + 1/9) VIN– (2) The input common-mode voltage range can be calculated using this equation, given that the output of A1 can swing to within 20mV of either rail. When the input common-mode range is exceeded (A1’s output is saturated), A2 can still be in linear operation and respond to changes in the non-inverting input voltage. However, the output voltage will be invalid. The common-mode range for the G = 50 configuration is included in the typical performance curve, “Input Common- Mode Range vs Output Voltage.” INPUT RANGE FOR BEST ACCURACY The internal amplifiers have rail-to-rail input stages, achieved by using complementary n-channel and p-channel input pairs. The common-mode input voltage determines whether the p-channel or the n-channel input stage is operating. The transition between the input stages is gradual and occurs between (V+) – 1.8V to (V+) – 1V. Due to these character- istics, operating the INA156 with input voltages within the transition region of (V+) – 1.8V to (V+) – 0.8V results in a shift in input offset voltage, and reduced common-mode and power supply rejection performance. Typical patterns of the offset voltage change throughout the input common-mode range are illustrated in Figure 6. The INA156 can be operated below or above the transition region with excellent results. Figure 7 demonstrates the use of the INA156 in a single-supply, high-side current monitor. In this application, the INA156 is operated above the transition region. RAIL-TO-RAIL OUTPUT A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For resistive loads greater than 10k Ω, the output voltage can swing to within a few millivolts of the supply rail while maintaining low gain error. For heavier loads and over temperature, see the typical performance curve “Output Voltage Swing vs Out- put Current.” The INA156’s low output impedance at high frequencies makes it suitable for directly driving Capaci- tive Digital-to-Analog (CDAC) input A/D converters, as shown in Figure 9. INPUT PROTECTION Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than 500mV. Momentary voltages greater than 500mV beyond the power supply can be tolerated if the current on the input pins is limited to 10mA. This is easily accomplished with input resistors RLIM, as shown in Figure 8. Many input signals are inherently current-limited to less than 10mA. Therefore, a limiting resistor is not required. INA156 7 6 4 5 Ref I L 2.5A G = 10 Pins 1 and 8 Open V+ NOTE: Output is referred to V+. 2 3 1 8 0.02 Ω Load 50mV +5V INA156 ADS7818 or ADS7834 12-Bits f SAMPLE = 500kHz 6 7 4 5 3 2 NOTE: G = 10 configuration 1 8 INA156 5 V OUT V REF R LIM R LIM I OVERLOAD 10mA max 3 6 2 1 8 Input Common-Mode Voltage (V) 0.0 0.5 1.0 2.5 3.0 1.5 2.0 5 4 3 2 1 0 –1 –2 –3 –4 –5 3.5 4.0 4.5 5.5 5.0 V S = 5.5V P-Channel Operation Transistion Region N-Channel Operation |
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