MAX4232AKA+T

The MAX4230–MAX4234 single/dual/quad, high-output drive CMOS op amps feature 200mA of peak output current, rail-to-rail input, and output capability from a single 2.7V to 5.5V supply. These amplifiers exhibit a high slew rate of 10V/μs and a gain-bandwidth product (GBWP) of 10MHz. The MAX4230–MAX4234 can drive typical headset levels (32Ω), as well as bias an RF power amplifier (PA) in wireless handset applications. The MAX4230 comes in a tiny 5-pin SC70 package and the MAX4231, single with shutdown, is offered in a 6-pin SC70 package and in 1.5mm x 1.0mm UCSP and thin ADFN packages. The dual op-amp MAX4233 is offered in the space-saving 10-bump chip-scale package (UCSP), providing the smallest footprint area for a dual op amp with shutdown. These op amps are designed to be part of the PA control circuitry, biasing RF PAs in wireless headsets. The MAX4231/ MAX4233 offer a SHDN feature that drives the output low. This ensures that the RF PA is fully disabled when needed, preventing unconverted signals to the RF antenna.

Applications

• RF PA Biasing Controls in Handset Applications
• Portable/Battery-Powered Audio Applications
• Portable Headphone Speaker Drivers (32Ω)
• Audio Hands-Free Car Phones (Kits)
• Tablet/Notebook Computers
• Digital-to-Analog Converter Buffers
• Transformer/Line Drivers

Key features

• Optimized for Headsets and High-Current Outputs
• 200mA Output Drive Capability
• 100dB Voltage Gain (RL = 100kΩ)
• 85dB Power-Supply Rejection Ratio
• No Phase Reversal for Overdriven Inputs
• Unity-Gain Stable for Capacitive Loads to 780pF
• Suitable for High-Bandwidth Applications
• 10MHz Gain-Bandwidth Product
• High Slew Rate: 10V/μs
• Extends the Battery Life of Portable Applications
• 1.1mA Supply Current per Amplifier
• Low-Power Shutdown Mode Reduces Supply Current to <1μA
• Small Package Options
• Tiny, 2.1mm x 2.0mm Space-Saving SC70 Package