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MAX492CSA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX492CSA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Single/Dual/Quad, Micropower, Single-Supply Rail-to-Rail Op Amps 10 ______________________________________________________________________________________ MAX495 10k 1 5 NULL VEE 4 NULL Figure 2. Offset Null Circuit __________Applications Information The dual MAX492, quad MAX494, and single MAX495 op amps combine excellent DC accuracy with rail-to- rail operation at both input and output. With their preci- sion performance, wide dynamic range at low supply voltages, and very low supply current, these op amps are ideal for battery-operated equipment and other low- voltage applications. Rail-to-Rail Inputs and Outputs The MAX492/MAX494/MAX495’s input common-mode range extends 0.25V beyond the positive and negative supply rails, with excellent common-mode rejection. Beyond the specified common-mode range, the out- puts are guaranteed not to undergo phase reversal or latchup. Therefore, the MAX492/MAX494/MAX495 can be used in applications with common-mode signals at or even beyond the supplies, without the problems associated with typical op amps. The MAX492/MAX494/MAX495’s output voltage swings to within 50mV of the supplies with a 100k Ω load. This rail-to-rail swing at the input and output substantially increases the dynamic range, especially in low supply- voltage applications. Figure 1 shows the input and out- put waveforms for the MAX492, configured as a unity-gain noninverting buffer operating from a single +3V supply. The input signal is 3.0Vp-p, 1kHz sinusoid centered at +1.5V. The output amplitude is approxi- mately 2.95Vp-p. Input Offset Voltage Rail-to-rail common-mode swing at the input is obtained by two complementary input stages in parallel, which feed a folded cascaded stage. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages close to the posi- tive rail. The offsets of the two pairs are trimmed; however, there is some small residual mismatch between them. This mismatch results in a two-level input offset characteris- tic, with a transition region between the levels occurring at a common-mode voltage of approximately 1.3V. Unlike other rail-to-rail op amps, the transition region has been widened to approximately 600mV in order to minimize the slight degradation in CMRR caused by this mismatch. To adjust the MAX495’s input offset voltage (500µV max at +25°C), connect a 10k Ω trim potentiometer between the two NULL pins (pins 1 and 5), with the wiper con- nected to VEE (pin 4) (Figure 2). The trim range of this circuit is ±6mV. External offset adjustment is not avail- able for the dual MAX492 or quad MAX494. The input bias currents of the MAX492/MAX494/MAX495 are typically less than 50nA. The bias current flows into the device when the NPN input stage is active, and it flows out when the PNP input stage is active. To reduce the offset error caused by input bias current flowing through external source resistances, match the effec- tive resistance seen at each input. Connect resistor R3 between the noninverting input and ground when using VIN VOUT Figure 1. Rail-to-Rail Input and Output (Voltage Follower Circuit, VCC = +3V, VEE = 0V) |
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