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MAX4232AUA-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4232AUA-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 28 page Choose gain-setting resistors RIN and RF according to the amount of desired gain, keeping in mind the maxi- mum output amplitude. The output coupling capacitor, COUT, blocks the DC component of the amplifier out- put, preventing DC current flowing to the load. The out- put capacitor and the load impedance form a highpass filer with the -3dB point determined by: For a 32 Ω load, a 100µF aluminum electrolytic capaci- tor gives a low-frequency pole at 50Hz. Bridge Amplifier The circuit shown in Figure 3 uses a dual MAX4230 to implement a 3V, 200mW amplifier suitable for use in size-constrained applications. This configuration elimi- nates the need for the large coupling capacitor required by the single op-amp speaker driver when sin- gle-supply operation is necessary. Voltage gain is set to 10V/V; however, it can be changed by adjusting the 82k Ω resistor value. Rail-to-Rail Input Stage The MAX4230–MAX4234 CMOS op amps have parallel- connected n- and p-channel differential input stages that combine to accept a common-mode range extend- ing to both supply rails. The n-channel stage is active for common-mode input voltages typically greater than (VSS + 1.2V), and the p-channel stage is active for common-mode input voltages typically less than (VDD - 1.2V). Rail-to-Rail Output Stage The minimum output is within millivolts of ground for sin- gle-supply operation, where the load is referenced to ground (VSS). Figure 4 shows the input voltage range and the output voltage swing of a MAX4230 connected as a voltage follower. The maximum output voltage swing is load dependent; however, it is guaranteed to be within 500mV of the positive rail (VDD = 2.7V) even with maximum load (32 Ω to ground). Observe the Absolute Maximum Ratings for power dis- sipation and output short-circuit duration (10s, max) because the output current can exceed 200mA (see the Typical Operating Characteristics.) Input Capacitance One consequence of the parallel-connected differential input stages for rail-to-rail operation is a relatively large input capacitance CIN (5pF typ). This introduces a pole at frequency (2 πR′CIN)-1, where R′ is the parallel combi- nation of the gain-setting resistors for the inverting or noninverting amplifier configuration (Figure 5). If the pole frequency is less than or comparable to the unity-gain bandwidth (10MHz), the phase margin is reduced, and the amplifier exhibits degraded AC performance through either ringing in the step response or sustained oscilla- tions. The pole frequency is 10MHz when R ′ = 2kΩ. To maximize stability, R ′ << 2kΩ is recommended. f RC dB L OUT − = 3 1 2 π MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/µs, Rail-to-Rail I/O Op Amps with Shutdown in SC70 10 Maxim Integrated Figure 4. Rail-to-Rail Input/Output Range Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW at 3V 1 6 7 5 2 8 3V 3V 3 4 MAX4232 1/2 MAX4232 1/2 0.5VP-P R5 51k Ω R1 16k Ω R2 82k Ω R4 10k Ω 32 Ω fs = 100Hz R3 10k Ω R6 51k Ω C2 0.1 µF C1 0.1 µF IN 1V/div OUT 1V/div 5 µs/div VCC = 3.0V RL = 100k Ω |
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