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ISL28227FRTBZ Folha de dados(PDF) 11 Page - Intersil Corporation |
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ISL28227FRTBZ Folha de dados(HTML) 11 Page - Intersil Corporation |
11 / 23 page ISL28127, ISL28227 11 FN6633.3 March 18, 2010 Applications Information Functional Description The ISL28127 and ISL28227 are single and dual, low noise 10MHz BW precision op amps. Both devices are fabricated in a new precision 40V complementary bipolar DI process. A super-beta NPN input stage with input bias current cancellation provides low input bias current (1nA typical), low input offset voltage (10µV typ), low input noise voltage (3nV/√Hz), and low 1/f noise corner frequency (5Hz). These amplifiers also feature high open loop gain (1500V/mV) for excellent CMRR (120dB) and THD+N performance (0.0002% @ 3.5VRMS, 1kHz into 2kΩ). A complimentary bipolar output stage enables high capacitive load drive without external compensation. 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). Parameter variation with operating voltage is shown in the “Typical Performance Curves” beginning on page 7. Input ESD Diode Protection The input terminals (IN+ and IN-) have internal ESD protection diodes to the positive and negative supply rails, and an additional anti-parallel diode pair across the inputs (see Figures 26 and 27). For unity gain applications (see Figure 26) where the output is connected directly to the non-inverting input a current limiting resistor (RIN) will be needed under the following conditions to protect the anti-parallel differential input protection diodes. • The amplifier input is supplied from a low impedance source. • The input voltage rate-of-rise (dV/dt) exceeds the maximum slew rate of the amplifier (±3.6V/µs). If the output lags far enough behind the input, the anti-parallel input diodes can conduct. For example, if an input pulse ramps from 0V to +10V in 1µs, then the output of the ISL28x27 will reach only +3.6V (slew rate = 3.6V/µs) while the input is at 10V, The input differential voltage of 6.4V will force input ESD diodes to conduct, dumping the input current directly into the output stage and the load. The resulting current flow can cause permanent damage to the ESD diodes. The ESD diodes are rated to 20mA, and in the previous example, setting RIN to 1k resistor (see Figure 26) would limit the current to < 6.4mA, and provide additional protection up to ±20V at the input. In applications where one or both amplifier input terminals are at risk of exposure to high voltage, current limiting resistors may be needed at each input terminal (see Figure 27 RIN+, RIN-) to limit current through the power supply ESD diodes to 20mA. FIGURE 25. % OVERSHOOT vs LOAD CAPACITANCE, VS = ±15V Typical Performance Curves V S = ±15V, VCM = 0V, RL = Open, unless otherwise specified. (Continued) CAPACITANCE (pF) 0 10 20 30 40 50 60 70 80 90 10 100 1000 10000 OV ERS HO OT + VS = ±15V RL = 10k AV = 1 VOUT = 100mVP-P OV ERS HO OT - FIGURE 26. INPUT ESD DIODE CURRENT LIMITING- UNITY GAIN - + RIN RL VIN VOUT V+ V- FIGURE 27. INPUT ESD DIODE CURRENT LIMITING - DIFFERENTIAL INPUT - + RIN- RL VIN- VOUT V+ V- RIN VIN+ |
Nº de peça semelhante - ISL28227FRTBZ |
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Descrição semelhante - ISL28227FRTBZ |
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