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ISL28207 Arkusz danych(PDF) 10 Page - Intersil Corporation |
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ISL28207 Arkusz danych(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN6631.0 June 5, 2009 Applications Information Functional Description The ISL28107 and ISL28207 are single and dual, very low 1/f noise (14nV/ √Hz @ 10Hz) precision op-amps. These amplifiers feature very high open loop gain (50kV/mV) for excellent CMRR (145dB), and gain accuracy. Both devices are fabricated in a new precision 40V complementary bipolar DI process. The super-beta NPN input stage with bias current cancellation provides bipolar-like levels of AC performance with the low input bias currents approaching JFET levels. The temperature stabilization provided by bias current cancellation removes the high input bias current temperature coefficient commonly found in JFET amplifiers. Figures 7 and 8 show the input bias current variation over temperature. The input offset voltage (VOS) has an very low, worst case value of 75µV max at +25°C and a maximum TC of 0.65µV/°C. Figure 6 shows VOS as a function of supply voltage and temperature with the common mode voltage at 0V for split supply operation. The complimentary bipolar output stage maintains stability driving large capacitive loads (to 10nF) without external compensation. The small signal overshoot vs. load capacitance is shown in Figure 28. Operating Voltage Range The devices are designed to operate over the 4.5V (±2.25V) to 40V (±20V) range and are fully characterized at 10V (±5V) and 30V (±15V). Both DC and AC performance remain virtually unchanged over the complete 4.5V to 40V operating voltage range. Parameter variation with operating voltage is shown in the “Typical Performance Curves” beginning on page 4. The input common mode voltage range sensitivity to temperature is shown in Figure 9 (±15V). Input ESD Diode Protection The input terminals (IN+ and IN-) each have internal ESD protection diodes to the positive and negative supply rails, a series connected 500 Ω current limiting resistor followed by an anti-parallel diode pair across the input NPN transistors (Circuit 1 in “Pin Descriptions” on page 9). The resistor-ESD diode configuration enables a wide differential input voltage range equal to the lesser of the Maximum Supply Voltage in the “Absolute Maximum Ratings” on page 2 (42V) or, a maximum of 0.5V beyond the V+ and V- supply voltage. The internal protection resistors eliminate the need for external input current limiting resistors in unity gain connections and other circuit applications where large voltages or high slew rate signals are present. Although the amplifier is fully protected, high input slew rates that exceed the amplifier slew rate (±0.32V/µs) may cause output distortion. Output Current Limiting The output current is internally limited to approximately ±40mA at +25°C and can withstand a short circuit to either rail as long as the power dissipation limits are not exceeded. This applies to only 1 amplifier at a time for the dual op-amp. Continuous operation under these conditions may degrade long term reliability. Output Phase Reversal Output phase reversal is a change of polarity in the amplifier transfer function when the input voltage exceeds the supply voltage. The ISL28107 and ISL28207 are immune to output phase reversal, even when the input voltage is 1V beyond the supplies. Using Only One Channel The ISL28207 is a dual op-amp. If the application only requires one channel, the user must configure the unused channel to prevent it from oscillating. The unused channel will oscillate if the input and output pins are floating. This will result in higher than expected supply currents and possible noise injection into the channel being used. The proper way to prevent this oscillation is to short the output to the inverting input and ground the positive input (as shown in Figure 29). Power Dissipation It is possible to exceed the +150°C maximum junction temperatures under certain load and power supply conditions. It is therefore important to calculate the maximum junction temperature (TJMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified to remain in the safe operating area. These parameters are related using Equation 1: where: •PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX) •PDMAX for each amplifier can be calculated using Equation 2: FIGURE 29. PREVENTING OSCILLATIONS IN UNUSED CHANNELS - + T JMAX T MAX θ JAxPDMAXTOTAL + = (EQ. 1) PD MAX V S I qMAX V S ( - V OUTMAX ) V OUTMAX R L ---------------------------- × + × = (EQ. 2) ISL28107, ISL28207 |
Podobny numer części - ISL28207 |
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Podobny opis - ISL28207 |
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