MAX9727

Quad Audio Line Driver with 3V_RMS Output

Quad Audio Line Driver that Outputs 2V_RMS Signals with a Single 5V Supply (1.6V_RMS with V_DD of 3.3V)

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Overview

2.7V to 5.5V Single-Supply Operation
High 100dB PSRR
109dB Signal-to-Noise Ratio (SNR)
Ground-Referenced Outputs
No Audible Clicks or Pops at Power-Up/Down
Differential Inputs
3V_RMS into 1kΩ Load at 5V
2V_RMS into 1kΩ Load at 3.3V
3mA Supply Current Per Channel
Unity-Gain Stable
100nA Low-Power Shutdown Mode
C_LOAD Drive > 220pF
±8kV HBM ESD-Protected Outputs

The MAX9727 quad audio line driver with 3V_RMS output is ideal for portable audio devices where board space and cost is at a premium. The device uses Maxim's DirectDrive® architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors and saving cost, board space, and component height. A high 100dB PSRR and low 0.0005% THD+N ensures clean, low-distortion amplification of the audio signal. Each MAX9727 amplifier can provide 3V_RMS to a 1kΩ load with less than 0.003% THD+N while operating from a single +5V supply. Each MAX9727 amplifier can provide 2V_RMS to a 1kΩ load with less than 0.003% THD+N while operating from a single +3.3V supply.

A shutdown input disables the amplifiers and reduces quiescent current consumption to less than 100nA. The MAX9727 features Maxim's comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during startup and shutdown.

The MAX9727 operates from a single 2.7V to 5.5V supply, consumes only 3mA of supply current per channel, and is specified over the -40°C to +85°C extended temperature range.

Applications

A/V Receivers
CD and DVD Players
Consumer and Professional Audio Equipment
Portable Audio Devices
Set-Top Boxes
Soundcards

Documentation

Data Sheet 1

MAX9727: Quad Audio Line Driver with 3V_RMS Output Data Sheet (Rev.0) 12/20/2005

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX9727

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Features and Benefits

2.7V to 5.5V Single-Supply Operation
Ground-Referenced Outputs
EV Kit with Four Easily Configured General-Purpose Op Amps
Drives 3V_RMS into 1kΩ Load at 5V Supply
109dB Signal-to-Noise Ratio (SNR)
No Audible Clicks or Pops at Power-Up/Down
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX9727 evaluation kit (EV kit) is a fully assembled and tested PCB that configures the MAX9727 as four general-purpose op amps. The EV kit provides the components to operate the MAX9727 as an inverting amplifier, a noninverting amplifier, a difference amplifier, or as an integrator.

The MAX9727 EV kit operates from a 2.7V to 5.5VDC power supply. The DirectDrive® feature of the MAX9727 provides outputs that swing above and below ground without DC-blocking capacitors on the output.