MAX9879

The MAX9879 combines a high-efficiency stereo Class D audio power amplifier with a stereo capacitor-less DirectDriveheadphone amplifier. The Class D power amplifier delivers up to 715mW from a 3.7V supply into an 8 load with 88% efficiency to extend battery life. Maxim's filterless class D amplifiers with active emissions limiting technology provide Class AB performance with Class D efficiency. The filterless modulation scheme of MAX9879 combined with active emission limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices. The headphone amplifier delivers up to 58mW from a 3.7V supply into a 16 load. Maxim's DirectDrive architecture produces a ground-referenced output from a single supply, eliminating the need for large DCblocking capacitors, saving cost, space and component height. A bypass mode feature disables the integrated Class D amplifier and utilizes an internal DPST switch to allow an external amplifier to drive the speaker that is connected at the outputs of the MAX9879. The device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I2C control. The MAX9879 is available in a thermally efficient, space-saving 30-bump UCSPpackage.

The features of MAX9879 can be summarized as (1)better than 9dB margin under EN 55022 class B limits with no filter components; (2)low rf susceptibility design rejects TDMA noise from GSM radios; (3)input mixer with user defined input mode; (4)stereo 715mW speaker output (RL = 8, VDD = 3.7V); (5)stereo 58mW headphone output (16, VDD = 3.7V); (6)low 0.04% THD+N at 1kHz (class d power amplifier); (7)low 0.018% THD+N at 1kHz (headphone amplifier); (8)88% efficiency (RL = 8, POUT = 750mW); (9)1.6 analog switch for speaker amplifier bypass; (10)high speaker amplifier PSRR (72dB at 217Hz); (11)high headphone amplifier PSRR (84dB at 217Hz); (12)I2C control; (13)hardware and software shutdown mode; (14)ultra-low click and pop; (15)robust design with current and thermal protection; (16)available in space-saving package 5x6 UCSP (2.5mm x 3mm).

The absolute maximum ratings of MAX9879 are (1)VDD, PVDDL, PVDDR to GND: -0.3V to +6V; (2)VDD, PVDDL to PVDDR: -0.3V to +0.3V; (3)VDD to PVDDL: -0.3V to +0.3V; (4)VCCIO to GND: -0.3V to +4V; (5)PGNDL, PGNDR, to GND:-0.3V to +0.3V; (6)PGNDL to PGNDR: -0.3V to +0.3V; (7)VSS to GND: -6V to +0.3V; (8)C1N to GND: (VSS 0.3V)to +0.3V; (9)C1P to GND: -0.3V to (PVDD_ + 0.3V); (10)HPL, HPR to VSS (Note 1): -0.3V to the lower of (VDD VSS + 0.3V)or +9V; (11)HPL, HPR to VDD (Note 2): +0.3V to the higher of (VSS PVDD_ 0.3V)or -9V; (12)INA1, INA2, INB1, INB2, BIAS:-0.3V to +4V; (13)SDA, SCL, SHDN:-0.3V to +4V; (14)all other pins to GND: -0.3V to (PVDD_ + 0.3V); (15)continuous current in/out of PVDD_, PGND_, OUT_: ±800mA; (16)continuous current in/out of HPR and HPL: 140mA; (17)continuous current in/out of RXIN+ and RXIN-: 150mA; (18)continuous input current: VSS: 100mA; (19)continuous input current: (All Other Pins): ±20mA; (20)duration of OUT_ short circuit to PGND_ or PVDD_: continuous; (21)duration of short circuit between OUT_+ and OUT_-: continuous; (22)duration of HP_ short circuit to GND or PVDDL: continuous; (23)continuous power dissipation (TA = +70°C)5x6 UCSP multilayer board (derate 16.5mW/°C above +70°C): 1250mW; (24)junction temperature:+150°C; (25)operating temperature range: -40°C to +85°C; (26)storage temperature range: -65°C to +150°C; (27)lead temperature (soldering, 10s): +300°C.