LOW POWER C O N V E R T E R S CS42L73 Highly Integrated Low Power Mobile Stereo Codec MIC (Jack Input) Keypad Touch Screen Controller LCD Controller MIC (Captive) LCD Digital Camera Application Processor IS 2 Main (Ear) Speaker Low Power Audio CODEC Hands-Free Speaker (CS42L73) Interface Class D Amp Line Out CS42L73 65-Ball FBGA Package I2S (actual size: 5 mm x 5 mm) A-GPS WLAN Baseband Processor (CS35L01) 2nd Hands-Free Speaker I2S Interface Mobile RF Power Management Unit CS42L73 64-Ball WLCSP Package (actual size: 3.44 mm x 3.44 mm) Market Applications Smartphones Mobile Internet Devices Bluetooth® Headsets Cirrus Logic, Inc. 2901 Via Fortuna Austin, Texas 78746 United States T +1-512-851-4000 Toll-Free +1-800-888-5016 Sales Support North America +1 800-625-4084 Asia Pacific +852 2376-0801 Japan +81 (3) 5226-7757 Europe/UK +44 (90) 1628-891-300 learn more at www.cirrus.com OVERVIEW CS42L73 is a highly integrated, low-power, mobile audio distribution network that incorporates two stereo DACs and a stereo ADC with ground centered headphone, line and speaker amplifiers for smartphone and portable applications. Three asynchronous bidirectional serial ports with integrated asynchronous sample rate converters (ASRCs) that accept a wide range of incoming audio sample rates can be used to feed the integrated digital mixing engine, which is the heart of the CS42L73. The engine can simultaneously overlay and distribute digital audio from up to three external sources to any of its integrated audio nodes, giving complete routeability to the mobile system designer. The analog audio peripherals, fed by the digital mixing engine of the CS42L73, routing into two stereo high performance DACs is designed with the smartphone in mind. Additional considerations include an integrated MIC bias to support the high performance stereo ADCs, as well as the first digital MIC input to a Cirrus Logic general market codec. Features such as a 1 VRMS line level output from a single 1.8 V power supply, and an on-board tri-level inverting charge pump capable of driving a headphone load with the lowest DC offset on the market contribute to the unique value of the CS42L73. The CS42L73 offers the lowest power consumption of any audio codec with integrated bi-directional SRCs. From the serial port to the stereo headphone load via the digital mixing engine and the SRCs, the CS42L73 burns only 3.5 mW in real world conditions. Key Values The CS42L73 can reduce the burden of the system’s applications processor by taking all digital audio sources into a central location, synchronizing the sources and then mixing them for distribution to the audio human interface peripherals. By driving into smaller process nodes the smartphone codec uses lower levels of power consumption than current models which require direct connection to the baseband processor and affords power savings for the overall system when the applications processor is dormant. System Features • Three independent serial ports with integrated asynch SRCs • Native (no PLL required) support for 6/12/24 MHz, 13/26 MHz, and 19.2/38.4 MHz master • High-speed I²C™ control port (400 kHz) For the full datasheet, visit www.cirrus.com/support. LOW POWER co n ver t ers | C S 4 2 L7 3 VL VD_FILT VCP VA VA +VCP_FILT –VCP_FILT Step-Down + VCP_FILT Inverting – VCP_FILT +VCP_FILT LDO Headphone Outputs VD_FILT MCLK1 MCLK –VCP_FILT MCLK +VCP_FILT Digital Processing MCLK2 Stereo Multi-bit ΔΣ DAC Control Port SDIN Auxiliary Serial Port Control Port Auxiliary Serial Port Audio Serial Port SDOUT Audio Serial Port SDIN Voice Serial Port Voice Serial Port Line Outputs –VCP_FILT VA MCLK Volume, Mute, Limiter SDOUT SDIN Level Shifters Digital Mixer ASRC SDOUT ASRC MIC/Line Input Path ASRC Auxiliary Serial Port Stereo Multi-bit ΔΣ DAC + ASRC Audio Serial Port ASRC Voice Serial Port B VP + Speakerphone Output – (Left) VP MCLK Decimator, DC Highpass Filter, Noise Gate, ALC, Volume, Mute, Swap/Mono B + Speakerphone Line – Output (Right) Stereo Multi-bit ΔΣ ADC Line Input (Left) –6 to +12 dB, 0.5 dB steps Digital MIC Interface Pseudo Diff. Input + Ear Speaker Output – VP A Volume, Mute, Limiter ASRC Pseudo Diff. Input Digital MIC Interface Psuedo Diff. Input Line Input (Right) +10 or +20 dB MIC 1 Pseudo Diff. Input VP MIC 2 MIC Bias MIC Bias Short Detect MIC 1 Bias MIC 2 Bias MIC2_SDET Pseudo Diff. Input +10 or +20 dB Features Analog I/O Mono DAC to Ear Speaker Amplifier • Stereo high performance ADC GG GG • High Power Output at -70 dB (0.032%) THD+N • -45 mW into 16 Ω @ 1.8 V 91 dB Dynamic Range (A-wtd) -85 dB THD+N Mono DAC to Speakerphone Amplifier • Dual digital microphone interface • Independent MIC bias outputs • Stereo DAC to headphone amplifier GG GG GG 94 dB Dynamic Range (A-wtd) -81 dB THD+N into 32 Ω Integrated Step-down/Inverting Charge Pump GG GG High HP Power Output at -70/-81 dB THD+N 2 x 17/8.5 mW into 16/32 Ω @ 1.8 V • High output power at ≤ 1% THD+N • -1.18/0.84/0.66 W into 8 Ω @ 5.0/4.2/3.7 V • Direct battery-powered operation Demonstration Board CDB42L73 • Class H amplifier - automatic supply adj. • Stereo DAC to Line Outputs Stereo High Performance Line Level DAC CS42L73 24 91 ADC 97 DAC –85 48 Pseudo Differential VA/VCP/VL = 1.66 to 1.94 VP = 3.0 to 5.25 VD = 0.85 to 1.40 © 2010 Cirrus Logic, Inc. All rights reserved. Product information is subject to change without notice. Cirrus Logic, Cirrus and the Cirrus Logic logo design are trademarks of Cirrus Logic, Inc. Other brand and product names may be trademarks or service marks of their respective owners. Package Comments Power Supply (V) Analog Outputs Sample Rate (kHz) THD+N (dB) Dynamic Range (dB) Resolution (bits) Part • 97 dB Dynamic Range (A-wtd) • -86 dB THD+N • 1 VRMS from a single 1.8 V power supply 2 ADCs, 4 DACs, Class-H HP, Class A/B speaker driver, 3x asynchronous serial ports 64 WLCSP 65 FBGA Product Bulletin 823110-0610-PB