Features: ·1.2W Filterless Class D Amplifiers Pass FCC Class B Radiated EMI Standards with 100mm of Cable
·Patented Spread-Spectrum Mode Offers 5dB EMI Improvement over Conventional Methods
·80mW DirectDrive Headphone Amplifier Eliminates Bulky DC-Blocking Capacitors
·High 85dB PSRR at 217Hz
·85% Efficiency
·Low 0.015% THD+N
·Industry-Leading Click-and-Pop Suppression
·Integrated 2-Way Input Mixer/Multiplexer (MAX9772)
·Integrated 3-Way Input Mixer/Multiplexer (MAX9770)
·Logic-Adjustable Gain
·Short-Circuit and Thermal Protection
·Available in Space-Saving, Thermally Efficient PackagesApplicationCellular Phones
PDAs
Compact NotebooksSpecificationsGND to PGND to CPGND......................................-0.3V to +0.3V
VDD to PVDD to CPVDD........................................-0.3V to +0.3V
VDD to GND .........................................................................+6V
PVDD to PGND......................................................................+6V
CPVDD to CPGND..................................................................+6V
CPVSS to CPGND....................................................................-6V
SVSS to GND..........................................................................-6V
C1N..........................................(PVSS - 0.3V) to (CPGND + 0.3V)
HPOUT_ to GND ..................................................................±3V
All Other Pins to GND.................................-0.3V to (VDD + 0.3V)
Continuous Current Into/Out of:
PVDD, PGND, OUT_......................................................600mA
PVSS............................................................................260mA
Duration of HPOUT_ Short Circuit to VDD, PVDD,
GND, PGND ...........................................................Continuous
Duration of Short Circuit Between
HPOUTL and HPOUTR ...........................................Continuous
Duration of OUT_ Short Circuit to VDD, PVDD, GND, PGND .....10s
Duration of Short Circuit Between OUT+ and OUT-................10s
Continuous Power Dissipation (TA = +70°C)
5 x 5 UCSP (derate 15.85mW/°C above +70°C) .......1.268W
28-Pin TQFN (derate 20.8mW/°C above +70°C) .....1667mW
28-Pin TSSOP (derate 12.8mW°C above +70°C) ....1026mW
Junction Temperature......................................................+150°C
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX9770/MAX9772 combine a mono, filterless,Class D speaker amplifier and stereo DirectDriveTM headphone amplifiers in a single device. The MAX9770/MAX9772 operate from a single 2.5V to 5.5V supply and include features that reduce external component count, system cost, board space, and offer improved audio reproduction.
The speaker amplifiers MAX9772 make use of Maxim's patented Class D architecture, providing Class AB performance with Class D efficiency, conserving board space, and extending battery life. The speaker amplifiers deliver 1.2W into an 8 load while offering efficiencies above 85%. A spread-spectrum modulation scheme reduces radiated emissions caused by the modulation frequency.Furthermore, the MAX9770/MAX9772 oscillators can be synchronized to an external clock through the SYNC input, avoiding possible problem frequencies inside a system. The speaker amplifier MAX9772 features THD+N as low as 0.025%, high 70dB PSRR, and SNR in excess of 90dB.
The headphone amplifiers MAX9772 feature Maxim's patented DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors. The headphone amplifiers deliver up to 80mW into a 16 load, feature low 0.015% THD+N, high 85dB PSRR, and ±8kV ESD-protected outputs. A headphone sense input of MAX9772 detects the presence of a headphone, and automatically configures the amplifiers for either speaker or headphone mode.
The MAX9770/MAX9772 include internally set, logicselectable gain, and a comprehensive input multiplexer/mixer, allowing multiple audio sources to be selected and for true mono reproduction of a stereo source in speaker mode. Industry-leading click-and-pop suppression eliminates audible transients during power and shutdown cycles. A low-power shutdown mode of MAX9772 decreases supply current consumption to 0.1A, further extending battery life.
The MAX9770 is offered in space-saving, thermally efficient 28-pin TQFN (5mm x 5mm x 0.8mm) and 28-pin TSSOP packages, while the MAX9772 is offered in a tiny (2.54mm x 2.54mm x 0.62mm) 25-bump chip-scale package (UCSP™). The MAX9770/MAX9772 feature thermal-overload and output short-circuit protection,and are specified over the extended -40°C to +85°C temperature range.
MAX9772 Data Sheet
