XX-XXXX; Rev 0; 10/05 Quad Audio Line Driver with 3VRMS Output The MAX9727 quad audio line driver with 3VRMS output is ideal for portable audio devices where board space and cost is at a premium. The device uses Maxim’s DirectDriveTM architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, 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 3VRMS to a 1kΩ load with less than 0.003% THD+N while operating from a single +5V supply. Each MAX9727 amplifier can provide 2VRMS 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-andpop 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 Features ♦ 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 3VRMS into 1kΩ Load at 5V 2VRMS into 1kΩ Load at 3.3V ♦ 3mA Supply Current Per Channel ♦ Unity-Gain Stable ♦ 100nA Low-Power Shutdown Mode ♦ CLOAD Drive > 220pF ♦ ±8kV HBM ESD-Protected Outputs Ordering Information PART TEMP RANGE PINPACKAGE GAIN MAX9727EEP+ -40°C to +85°C 20 QSOP Adjustable +Denotes lead-free package. Simplified Block Diagram Set-Top Boxes CD and DVD Players Consumer and Professional Audio Equipment Soundcards Portable Audio Devices A/V Receivers OUTA OUTD INA- IND- INA+ IND+ INB+ INC+ INB- INC- OUTB OUTC SHDN PVSS Pin Configuration TOP VIEW OUTA 1 20 OUTD INA- 2 19 IND- INA+ 3 18 IND+ VDD 4 MAX9727 INB+ 5 17 VSS 16 INC+ INB- 6 15 INC- OUTB 7 14 OUTC SHDN 8 13 PVSS PVDD 9 12 C1N C1P 10 11 PGND ON OFF PVDD C1P MAX9727 PGND C1N QSOP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX9727 General Description