max9729etit Maxim Integrated Products, Inc., max9729etit Datasheet
max9729etit
Related parts for max9729etit
max9729etit Summary of contents
Page 1
Rev 0; 7/07 Stereo Headphone Amplifier with BassMax, General Description The MAX9729 stereo DirectDrive™ headphone amplifi- er features bass boost, volume control, an input mux, 2 and an I C/SMBus™-compatible serial interface. This makes the MAX9729 ideal for portable ...
Page 2
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux ABSOLUTE MAXIMUM RATINGS PGND or SGND .................................-0. ................................................Internally Connected .......................................................................±0. SGND to ...
Page 3
Stereo Headphone Amplifier with BassMax, ELECTRICAL CHARACTERISTICS (3V Supply) (continued) = SHDN = 3V, PGND = SGND = 0V 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation ( ...
Page 4
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux ELECTRICAL CHARACTERISTICS (3V Supply) (continued) = SHDN = 3V, PGND = SGND = 0V 1µF, BM_ = 0V, maximum gain setting = 6dB, volume ...
Page 5
Stereo Headphone Amplifier with BassMax, ELECTRICAL CHARACTERISTICS (2.4V Supply) (continued) = SHDN = 2.4V, PGND = SGND = 0V 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation ( ...
Page 6
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux = SHDN = 3V, PGND = SGND = 0V 1µ BM_ = 0V, maximum gain setting = 3.5dB, ...
Page 7
Stereo Headphone Amplifier with BassMax, = SHDN = 3V, PGND = SGND = 0V 1µ BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB ...
Page 8
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux = SHDN = 3V, PGND = SGND = 0V 1µ BM_ = 0V, maximum gain setting = 3.5dB, ...
Page 9
Stereo Headphone Amplifier with BassMax, = SHDN = 3V, PGND = SGND = 0V 1µ BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB ...
Page 10
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux PIN NAME Right BassMax Input. Connect an external passive network between OUTR and BMR to apply bass 16 BMR boost to the right-channel output. See the BassMax Gain-Setting Components section. ...
Page 11
Stereo Headphone Amplifier with BassMax, phone, resulting in unnecessary power dissipation and possible damage to both headphone and headphone amplifier. In addition to the cost and size disadvan- tages, the DC-blocking capacitors required by conven- tional headphone amplifiers limit low-frequency ...
Page 12
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux contents of the command register are not affected when in shutdown. This allows the master device to write to the MAX9729 while in shutdown. When a shutdown is activated, either ...
Page 13
Stereo Headphone Amplifier with BassMax, The MAX9729 features a BEEP input with eight different attenuation settings (see Table 6). The BEEP input is useful for applications requiring the routing of a system alert signal to the stereo audio path. The ...
Page 14
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux S Sr SCL SDA Figure 4. START, STOP, and REPEATED START Conditions START and STOP Conditions SDA and SCL idle high when the bus is not in use. A master ...
Page 15
Stereo Headphone Amplifier with BassMax, FROM MASTER DEVICE S START CONDITION Figure 6a. Write Data Format for Writing to Register 0x00 Only FROM MAX9729 FROM MASTER DEVICE S SLAVE ADDRESS R/W START CONDITION Figure 6b. Write Data Format for Writing ...
Page 16
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux FROM MASTER DEVICE S START CONDITION Figure 7a. Read Data Format for Reading Register 0x00 Only FROM MAX9729 FROM MASTER DEVICE S SLAVE ADDRESS R/W START CONDITION Figure 7b. Read ...
Page 17
Stereo Headphone Amplifier with BassMax, Table 4. Multiplexer/Mixer Control (Register 0x00 (INL1 + INL2 + INL3 The MAX9729 features internal power-on reset (POR) circuitry that initializes the device ...
Page 18
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux Table 5a. Volume Control (Register 0x00) ATTEN FROM MAX GAIN SETTING (dB -1.7 0 ...
Page 19
Stereo Headphone Amplifier with BassMax, Table 5b. Volume Control (Register 0x00) ATTEN FROM MAX GAIN SETTING (dB -1 -3.4 0 ...
Page 20
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux Table 5c. Volume Control (Register 0x00) ATTEN FROM MAX GAIN SETTING ( -1.7 0 ...
Page 21
Stereo Headphone Amplifier with BassMax, MAX9729 VOLUME CONTROL TRANSFER FUNCTION 100 CODE (DECIMAL) Figure 8. MAX9729 Volume Control Transfer Function Table 6. Beep Level (Register ...
Page 22
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux Input-Coupling Capacitor The AC-coupling capacitor (C ) and input resistor (R IN form a highpass filter that removes any DC bias from an input signal. See the Functional Diagram/Typical Operating ...
Page 23
Stereo Headphone Amplifier with BassMax, Table 11. BassMax Pole and Zero Examples for a Gain Boost of 8.8dB (R1 = 47kΩ 22kΩ) C6 (nF) f (Hz) POLE 100 ...
Page 24
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux 24 ______________________________________________________________________________________ Functional Diagram/Typical Operating Circuit ...
Page 25
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux 10kΩ 10kΩ SDA SCL SHDN CONTROLLER BEEP_EN C IN 1μF BEEP ADD C IN 1μF INL1 C AUDIO CODEC IN 1μF INR1 C IN 1μF INL2 C BASEBAND IC IN ...
Page 26
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux TOP VIEW 26 ______________________________________________________________________________________ N. BEEP INL1 25 MAX9729 26 INL2 27 INL3 + INR1 ...
Page 27
Stereo Headphone Amplifier with BassMax, (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Volume Control, and Input Mux Package Information PACKAGE OUTLINE, 16, 20, ...
Page 28
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of ...