AD1980

a FEATURES AC ’97 2.3 COMPATIBLE FEATURES 6 DAC Channels for 5.1 Surround S/PDIF Output Integrated Stereo Headphone Amplifier Variable Rate Audio Double Rate Audio (fS = 96 kHz) Greater than 90 dB Dynamic Range 20-Bit PCM DACs Line-Level Mono ”Phone” Input High Quality CD Input Selectable MIC Input with Preamp AUX and Line_In Stereo Inputs External Amplifier Power-Down Control Power Management Modes 48-Lead LQFP Package AC ’97 SoundMAX Codec AD1980 ® ENHANCED FEATURES Integrated Parametric Equalizer Stereo MIC Preamp Support Integrated PLL for System Clocking Variable Sample Rate 7 kHz to 96 kHz Jack Sense (Auto Topology Switching) Software Controlled VREF_OUT for MIC Bias Software Enabled Outputs for Jack Sharing Auto Down-Mix and Channel Spreading Modes FUNCTIONAL BLOCK DIAGRAM VREFOUT VREF VOLTAGE REFERENCE XTL_OUT XTL_IN SPDIF AD1980 MC1 MIC PREAMP G G G MC2 PHONE_IN CD_L CD_GND CD_R AUX_L AUX_R LINE_IN_L LINE_IN_R CD DIFF AMP 2CMIC CODEC CORE PCM L/R ADC RATE SPDIF TX MS PLL RECORD SELECTOR ID0 G M 16-BIT ⌺-⌬ ADC 16-BIT ⌺-⌬ ADC ID1 G M PCM LFE DAC RATE RESET LFE_OUT MZ A SPRD M G AC '97 INTERFACE 20-BIT ⌺-⌬ DAC DAC SLOT LOGIC SYNC CENTER_OUT MZ A SPRD M G 20-BIT ⌺-⌬ DAC GA M M M GA M GA M GA M GA M GA M GA M GA M M M G = GAIN A = ATTENUATION M = MUTE Z = HIGH Z PCM FRONT DAC RATE BITCLK LINE_OUT_L MZ MZ MZ A BYPASS MONO_OUT LINE_OUT_R A LOSEL EQ COEF STORAGE LOSEL SDATA_OUT EQ SDATA_IN A M M M M HPSEL G G 20-BIT ⌺...