XX-XXXX; Rev 0; 10/05
Quad Audio Line Driver with 3VRMS Output
General Description
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.
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
MAX9727
♦ 3mA Supply Current Per Channel ♦ Unity-Gain Stable ♦ 100nA Low-Power Shutdown Mode ♦ CLOAD Drive > 220pF ♦ ±8kV HBM ESD-Protected Outputs
Ordering Information
PART MAX9727EEP+ TEMP RANGE -40°C to +85°C PINPACKAGE 20 QSOP GAIN Adjustable
Applications
Set-Top Boxes Consumer and Professional Audio Equipment A/V Receivers CD and DVD Players Soundcards Portable Audio Devices
+Denotes lead-free package.
Simplified Block Diagram
OUTA OUTD
INA-
IND-
Pin Configuration
INA+ IND+ INC+
TOP VIEW
OUTA 1 INA- 2 INA+ 3 VDD 4 INB+ 5 INB- 6 OUTB 7 SHDN 8 PVDD 9 C1P 10 20 OUTD 19 IND18 IND+
INB+
INB-
INC-
MAX9727
17 VSS 16 INC+ 15 INC14 OUTC 13 PVSS 12 C1N 11 PGND C1P C1N ON OFF SHDN PVDD PVSS OUTB OUTC
MAX9727
PGND
QSOP ________________________________________________________________ Maxim Integrated Products 1
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.
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