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MAX4474EKA-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4474EKA-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page Single/Dual/Quad, +1.8V/750nA, SC70, Rail-to-Rail Op Amps 10 ______________________________________________________________________________________ R1 2pF TO 10pF R2 VIN VCC VSS MAX44_ _ Figure 2. Compensation for Feedback Node Capacitance Applications Information Ground Sensing The common-mode input range of the MAX4470 family extends down to ground, and offers excellent common- mode rejection. These devices are guaranteed not to undergo phase reversal when the input is overdriven. Power Supplies and Layout The MAX4470 family operates from a single +1.8V to +5.5V power supply. Bypass power supplies with a 0.1µF ceramic capacitor placed close to the VDD pin. Ground layout improves performance by decreasing the amount of stray capacitance and noise at the op amp’s inputs and outputs. To decrease stray capacitance, mini- mize PC board lengths and resistor leads, and place external components close to the op amps’ pins. Bandwidth The MAX4470/MAX4471/MAX4472 are internally compensated for unity-gain stability and have a typical gain-bandwidth of 9kHz. The MAX4464/MAX4474 have a 40kHz typical gain-bandwidth and are stable for a gain of +5V/V or greater. Stability The MAX4464/MAX4470/MAX4471/MAX4472/MAX4474 maintain stability in their minimum gain configuration while driving capacitive loads. Although this product family is primarily designed for low-frequency applica- tions, good layout is extremely important because low- power requirements demand high-impedance circuits. The layout should also minimize stray capacitance at the amplifier inputs. However some stray capacitance may be unavoidable, and it may be necessary to add a 2pF to 10pF capacitor across the feedback resistor as shown in Figure 2. Select the smallest capacitor value that ensures stability. Pin Description (continued) PIN MAX4470/ MAX4464 MAX4471/ MAX4474 MAX4472 NAME FUNCTION — 1 1 OUTA Amplifier Output (Channel A) — 6 6 INB- Inverting Amplifier Input (Channel B) — 5 5 INB+ Noninverting Amplifier Input (Channel B) — 7 7 OUTB Amplifier Output (Channel B) —— 9 INC- Inverting Amplifier Input (Channel C) —— 10 INC+ Noninverting Amplifier Input (Channel C) —— 8 OUTC Amplifier Output (Channel C) —— 13 IND- Inverting Amplifier Input (Channel D) —— 12 IND+ Noninverting Amplifier Input (Channel D) —— 14 OUTD Amplifier Output (Channel D) 58 4 VDD Positive Power-Supply Voltage |
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