Rainbow-electronics MAX9729 User Manual

General DescriptionThe MAX9729 stereo DirectDrive™ headphone amplifi-er features bass boost, volume control, an input mux,and an I2C/SMBus™-compatible

MAX9729Detailed DescriptionThe MAX9729 stereo headphone amplifier featuresMaxim’s patented DirectDrive architecture, eliminatingthe large output-coupl

phone, resulting in unnecessary power dissipation andpossible damage to both headphone and headphoneamplifier. In addition to the cost and size disadv

MAX9729contents of the command register are not affectedwhen in shutdown. This allows the master device towrite to the MAX9729 while in shutdown.When

BEEP InputThe MAX9729 features a BEEP input with eight differentattenuation settings (see Table 6). The BEEP input isuseful for applications requiring

MAX9729START and STOP ConditionsSDA and SCL idle high when the bus is not in use. Amaster device initiates communication by issuing aSTART condition.

Read Data FormatA read from the MAX9729 includes transmission of aSTART condition, the slave address with the R/W bit set to 1, one or two bytes of re

gains for the MAX9729. Figure 8 shows the volumecontrol transfer function for the MAX9729.Use bits [B7:B5] in register 0x01 to set the BEEP inputatten

Power-On ResetThe MAX9729 features internal power-on reset (POR)circuitry that initializes the device upon power-up. Thecontents of the MAX9729’s comm

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux18 _______________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux2 ________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux20 _______________________________________________________________________

Charge-Pump Flying Capacitor (C1)The charge-pump flying capacitor connected betweenC1N and C1P affects the charge pump’s load regula-tion and output i

MAX9729Input-Coupling CapacitorThe AC-coupling capacitor (CIN) and input resistor (RIN)form a highpass filter that removes any DC bias from aninput si

capacitor as close to VDDas possible. Route PGNDand all traces that carry switching transients away fromSGND and the audio signal path. Route digital

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux24 _______________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux26 _______________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input MuxMaxim cannot assume responsibility for use of any circuitry other than cir

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux4 ________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux6 ________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux8 ________________________________________________________________________

MAX9729Stereo Headphone Amplifier with BassMax,Volume Control, and Input Mux__________________________________________________________________________