MAX9856

The MAX9856 supports all common sample rates from 8kHz to 48kHz in both master and slave mode. The serial digital audio interfaces support a variety of formats including I2S, left-justified, and PCM modes. Outputs include stereo DirectDrive line outputs and DirectDrive headphone amplifiers. The stereo ADC MAX9856 can convert audio signals from either internal or external microphones that can be configured for single-ended or differential signal inputs. Line inputs can be configured as stereo, differential, or mono and fed through one channel of the microphone path. The analog inputs selected can be gain ranged or mixed with other input sources prior to conversion to digital. The ADC path also features programmable digital highpass filters to remove DC offset voltages and wind noise. The MAX9856 is a high-performance, low-power stereo audio CODEC designed for MP3, personal media players (PMPs), or other portable multimedia devices. Using on-board stereo DirectDriveheadphone amplifiers, the CODEC can output 30mW into stereo 32 headphones while operating from a single 1.8V power supply. Very low 9mW playback power consumption makes it an ideal choice for battery-powered applications. The MAX9856 provides microphone input amplifiers, plus flexible input selection, signal mixing, and automatic gain control (AGC). Comprehensive loadimpedance sensing allows the MAX9856 to autodetect most common audio and audio/video headset and jack plug types. The MAX9856 uses a thermally efficient, space-saving 40-pin, 6mm x 6mm x 0.8mm TQFN package.

The features of MAX9856 can be summarized as (1)1.71V to 3.6V single-supply operation; (2)stereo 30mW directdrive headphone amplifier; (3)stereo 1VRMS directdrive line outputs (VDD = 1.8V)and stereo line inputs; (4)low-noise stereo and mono differential microphone inputs with automatic gain control and noise quieting; (5)9mW playback power consumption (VDD = 1.8V); (6)91dB 96kHz 18-bit stereo DAC; (7)85dB 48kHz 18-bit stereo ADC; (8)supports any master clock frequency from 10MHz to 60MHz; (9)ADCs and DACs can run at independent sample rates; (10)flexible audio mixing and volume control; (11)clickless/popless operation; (12)headset detection logic; (13)I2C control interface.

The absolute maximum ratings of MAX9856 are (1)AVDD, DVDD, DVDDS2, CPVDD: -0.3V to +4V; (2)PVSS, SVSS:Capacitor connection only; (3)AGND, DGND, CPGND: -0.3V to +0.3V; (4)HPL, HPR: (SVSS 0.3V)to (AVDD + 0.3V); (5)HGNDSNS, LGNDSNS, MICGND: -0.3V to +0.3V; (6)JACKSNS: (SVSS 0.3V)to (AVDD + 0.3V); (7)LOUTL, LOUTR: (SVSS 0.3V)to (AVDD + 0.3V); (8)LINEIN1, LINEIN2, AUXIN: -2V to +2V; (9)MICL, MICR, INLP, INLM, INRM: -2V to +2V; (10)C1N: (PVSS 0.3V)to (CPGND + 0.3V); (11)C1P: (CPGND 0.3V)to (CPVDD + 0.3V); (12)PREG, REF, MBIAS, MICBIAS: -0.3V to (AVDD + 0.3V); (13)NREG: (SVSS 0.3V)to +0.3V; (14)MCLK: -0.3V to +4V; (15)SDA, SCL, IRQ: -0.3V to +4V; (16)LRCLK_A, LRCLK_D, BCLK, SDIN, SDOUT: -0.3V to (DVDDS2 + 0.3V); (17)Continuous Current Into/Out of HPR/HPL/ LOUTL/LOUTR: 150mA; (18)CPVDD/CPGND/C1P/C1N/PVSS: 300mA; (19)any other pin: 20mA; (20)duration of HPR/HPL/LOUTL/LOUTR Short Circuit to AVDD/AGND/CPVDD/CPGND: continuous; (21)continuous power dissipation (TA = +70°C)40-Pin TQFN (derate 26.3mW/°C above +70°C, single-layer board): 2105mW / 40-Pin TQFN (derate 37mW/°C above +70°C, multilayer board): 2963mW; (22)operating temperature range: -40°C to +85°C; (23)storage temperature range: -65°C to +150°C; (24)lead temperature (soldering, 10s): +300°C.