Datasheet MAX9700 (Maxim)

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MAX9700 1.2W, Low-EMI, Filterless, Class D Audio Amplifier General Description Features
The MAX9700 mono class D audio power amplifier ● Filterless Amplifier Passes FCC Radiated provides class AB amplifier performance with class D Emissions Standards with 100mm of Cable efficiency, conserving board space and extending battery ● Unique Spread-Spectrum Mode Offers 5dB life. Using a class D architecture, the MAX9700 Emissions Improvement Over Conventional Methods delivers 1.2W into an 8Ω load while offering efficiencies ● Optional External SYNC Input above 90%. A low-EMI modulation scheme renders the ● Simple Master-Slave Setup for Stereo Operation traditional class D output filter unnecessary. ● 94% Efficiency The MAX9700 offers two modulation schemes: a fixed- ● 1.2W into 8Ω frequency (FFM) mode, and a spread-spectrum (SSM) ● Low 0.01% THD+N mode that reduces EMI-radiated emissions due to the ● High PSRR (72dB at 217Hz) modulation frequency. Furthermore, the MAX9700 oscillator ● Integrated Click-and-Pop Suppression can be synchronized to an external clock through the ● Low Quiescent Current (4mA) SYNC input, allowing the switching frequency to be user ● Low-Power Shutdown Mode (0.1μA) defined. The SYNC input also allows multiple MAX9700s ● Short-Circuit and Thermal-Overload Protection to be cascaded and frequency locked, minimizing ● Available in Thermally Efficient, Space-Saving interference due to clock intermodulation. The device Packages utilizes a fully differential architecture, a full-bridged • 10-Pin TDFN (3mm x 3mm x 0.8mm) output, and comprehensive click-and-pop suppression. • 10-Pin μMAX The gain of the MAX9700 is set internally (MAX9700A: • 12-Bump UCSP (1.5mm x 2mm x 0.6mm) 6dB, MAX9700B: 12dB, MAX9700C: 15.6dB, MAX9700D: 20dB), further reducing external component count.
Ordering Information
The MAX9700 features high 72dB PSRR, a low 0.01%
TOP
THD+N, and SNR in excess of 90dB. Short-circuit and
PART TEMP RANGE PIN- PACKAGE MARK
thermal-overload protection prevent the device from MAX9700AETB+ -40°C to +85°C 10 TDFN-EP* ACM damage during a fault condition. The MAX9700 is available MAX9700AEUB+ -40°C to +85°C 10 µMAX — in 10-pin TDFN (3mm x 3mm x 0.8mm), 10-pin μMAX®, and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm) packages. MAX9700AEBC+T -40°C to +85°C 12 UCSP — The MAX9700 is specified over the extended -40°C to MAX9700BETB+ -40°C to +85°C 10 TDFN-EP* ACI +85°C temperature range. MAX9700BEUB+ -40°C to +85°C 10 µMAX — MAX9700BEBC+T -40°C to +85°C 12 UCSP —
Applications
*EP = Exposed pad. ● Cellular Phones ● MP3 Players
Ordering Information continued and Selector Guide appears
● PDAs ● Portable Audio
at end of data sheet. Block Diagram Pin Configurations
VDD TOP VIEW VDD 1 10 PVDD IN+ 2 9 OUT- DIFFERENTIAL MODULATOR
MAX9700
AUDIO INPUT AND H-BRIDGE IN- 3 8 OUT+ GND 4 7 PGND SYNC OSCILLATOR SHDN 5 6 SYNC INPUT
MAX9700 TDFN/µMAX
Pin Configurations continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. μMAX is a registered trademark of Maxim Integrated Products, Inc. 19-3030; Rev 3; 3/18