AD1981B

a FEATURES AC ’97 2.3 COMPATIBLE FEATURES S/PDIF Output, 20 Bits Data Format, Supporting 48 kHz and 44.1 kHz Sample Rates Integrated Stereo Headphone Amplifier Variable Sample Rate Audio External Audio Power-Down Control Greater than 90 dB Dynamic Range Stereo Full-Duplex Codec 20-Bit PCM DAC 3 Analog Line-Level Stereo Inputs for Line-In, AUX, and CD Mono Line-Level Phone Input Dual MIC Input with Built-In Programmable Preamp High Quality CD Input with Ground Sense AC ’97 SoundMAX Codec AD1981B Mono Output for Speakerphone or Internal Speaker Power Management Support 48-Lead LQFP Package, Lead-Free Available ENHANCED FEATURES Stereo MIC Preamps Support Built-In Digital Equalizer Function for Optimized Speaker Sound Full-Duplex Variable Sample Rates from 7040 Hz to 48 kHz with 1 Hz Resolution Jack Sense Pins Provide Automatic Output Switching Software Programmed VREFOUT Output for Biasing Microphone and External Power Amp Split Power Supplies: 3.3 V Digital and 5 V Analog Multiple Codec Configuration Options ® FUNCTIONAL BLOCK DIAGRAM VREFOUT VREF XTL_OUT XTL_IN SPDIF AD1981B G MIC PREAMP MIC1 MS VOLTAGE REFERENCE CODEC CORE G G 2CMIC SPDIF TX MIC2 PHONE_IN CD_L CD_GND CD_R AUX_L AUX_R LINE_IN_L LINE_IN_R CD DIFF AMP PCM L/R ADC RATE RECORD SELECTOR PLL ID0 G M 16-BIT ⌺-⌬ ADC 16-BIT ⌺-⌬ ADC ID1 G M G G MONO_OUT M A MIX M M 16-BIT ⌺-⌬ ADC 16-BIT ⌺-⌬ ADC AC '97 INTERFACE ADC AND DAC SLOT LOGIC RESET SYNC BIT_CLK EQ CORE STORAGE M GA 20-BIT ⌺-⌬ DAC B...