MAX4480AUK+T

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1. Description

The MAX4480AUK+T –MAX4483 low-cost, general-purpose op amps offer rail-to-rail outputs, draw only 50μA of quiescent current, and operate from a single +2.5V to +5.5V supply. For additional power conservation, the MAX4481 offers a low-power shutdown mode that reduces supply current to 0.5μA (max) and puts the amplifier’soutput in a high-impedance state. These devices are unity-gain stable with capacitive loads up to 400pF. The MAX4480– MAX4483 are specified to +125°C, making them suitable for use in a variety of harsh environments. The MAX4480 is a single amplifier offered in a tiny 5 pin SC70 package. The MAX4481 is a single amplifier with a low-power shutdown mode that reduces supply current to < 0.5μA and comes in a 6-pin SC70 package. The MAX4482 is a dual amplifier and comes in the space-saving 8-pin SOT23 or μMAX® package. The MAX4483 is a quad amplifier and comes in a 14-pin TSSOP package. All devices are specified for operation across the -40°C to+125°C automotive temperature range.

2. Features

    1. Single +2.5V to +5.5V Supply Voltage Range

    2. 50μA Quiescent Current per Amplifier

    3. 0.5μA (max) Shutdown Mode (MAX4481)

    4. Available in Space-Saving Packages

        - 5-Pin SC70 (MAX4480)

        - 6-Pin SC70 (MAX4481)

        - 8-Pin SOT23 (MAX4482)

    5. 105dB AVOL with 5kΩ Load

    6. 0.005% THD with 100kΩ Load

    7. Rail-to-Rail Output Voltage Swing

    8. 3.0mA of Sink and Source Load Current

    9. Unity-Gain Stable up to CLOAD = 400pF

3. Applications

    1. Single-Supply Zero-Crossing Detectors

    2. Instruments and Terminals

    3. Portable Communications

    4. Electronic Ignition Modules

    5. Infrared Receivers

    6. Sensor Signal Detection

4. Pin Configurations

5. Rail-to-rail output stage

MAX4480–MAX4483 can drive 5kΩ loads and still It usually swings within 80mV of the power rail. The MAX4480 output voltage swing is configured as AV = +10V/V.

6. Drive capacitive load

Driving capacitive loads can cause many operations to be unstable Amplifiers, especially those with low quiescent current. this MAX4480–MAX4483 have stable unity gain in a certain range The capacitive load exceeds 400pF. The MAX4480 responds to excessive capacitive loads. Add a series resistor between the output and the load Capacitors improve the response of the circuit in the following ways Isolate the load capacitance from the output of the op amp.

7. Shutdown Mode

The MAX4481 features a low-power shutdown mode. When SHDN goes low, the supply current drops to 0.05μA (typ) and the output enters a high-impedance state. Pull SHDN high to enable the amplifier. Do not leave SHDN floating. Figure 4 shows the shutdown waveform.

8. Power-Up

The MAX4480–MAX4483 outputs typically settle within 50μs after power-up. Figure 5 shows the output voltage on power-up and power-down.

9. Power Supplies and Layout

The MAX4480–MAX4483 operate from a single +2.5V to +5.5V power supply. Bypass the power supply with a 0.1μF capacitor to ground. Good layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp’s inputs and outputs. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp’s pins