cs42l73 · cs42l73 is a highly integrated, low-power, mobile audio distribution network that...
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OVERVIEWCS42L73 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.
CS42L73 HIgHLy IntEgRatEd LOW POWER MObILE StEREO COdEC
LEaRn MORE at
www.cirrus.com
LOW POWER C O n V E R t E R S
CS42L73 65-baLL Fbga PaCkagE(actual size: 5 mm x 5 mm)
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
Application Processor
MIC (Jack Input )
MIC (Captive)
Main (Ear) Speaker
Hands-Free Speaker
2nd Hands-Free Speaker
Touch Screen
Controller
LCD Controller
Class D Amp
(CS35L01)
Power Management Unit
Baseband Processor
I2S
I2S I2S
Digital Camera
Interface
Line Out
WLAN
A-GPS
Keypad
LCD
Interface
Mobile RF
Low PowerAudio CODEC
(CS42L73)
kEy VaLuESThe 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 C O n V E R t E R S | C S 4 2 L 7 3
© 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. Product Bulletin 823110-0610-PB
FEatuRESAnAlog I/o
Stereo high performance ADC•91 dB Dynamic Range (A-wtd) G-85 dB THD+N G
Dual digital microphone interface•Independent MIC bias outputs•Stereo DAC to headphone amplifier•
94 dB Dynamic Range (A-wtd) G-81 dB THD+N into 32 G ΩIntegrated Step-down/Inverting Charge Pump G
Class H amplifier - automatic supply adj.•High HP Power Output at -70/-81 dB THD+N G2 x 17/8.5 mW into 16/32 G Ω @ 1.8 V
Stereo DAC to Line Outputs•
Stereo HIgH PerformAnce lIne level DAc97 dB Dynamic Range (A-wtd)•-86 dB THD+N•1 V• RMS from a single 1.8 V power supply
mono DAc to eAr SPeAker AmPlIfIerHigh Power Output at -70 dB (0.032%) THD+N•-45 mW into 16 • Ω @ 1.8 V
mono DAc to SPeAkerPHone AmPlIfIerHigh output power at • ≤ 1% THD+N-1.18/0.84/0.66 W into 8 • Ω @ 5.0/4.2/3.7 VDirect battery-powered operation•
dEMOnStRatIOn bOaRd Cdb42L73
Part
reso
luti
on
(bit
s)
Dyn
amic
ra
nge
(dB
)
tHD
+n (d
B)
Sam
ple
rate
(k
Hz)
Ana
log
out
puts
Pow
er
Supp
ly (v
)
com
men
ts
Pack
age
cS42l73 2491 ADC 97 DAC
–85 48Pseudo
Differential
VA/VCP/VL = 1.66 to 1.94VP = 3.0 to 5.25
VD = 0.85 to 1.40
2 ADCs, 4 DACs, Class-H HP,Class A/B speaker driver,
3x asynchronous serial ports
64 WLCSP65 FBGA
Digital Processing
Volume, Mute, Limiter
Level Shif ters
Control Port
LDO
Auxiliary Serial Port
Audio Serial Port
Voice Serial Port
MCLK1
VL VD_FILT VA
MCLK2
Control Port
Auxiliary Serial Port
Audio Serial Port
Voice Serial Port
Digital MIC Interface
Stereo Multi-bit ΔΣ ADC
Volume, Mute, Limiter
ASRC
ASRC
ASRC
ASRC
ASRC
ASRC
SDIN
MCLK
VD_FILT
VA
MCLK
MCLK
MCLK
+10 or +20 dB
+10 or +20 dB
B
A
VP
B
VP
VA
–VCP_FILT
–VCP_FILT
+VCP_FILT
+VCP_FILT
Headphone Outputs
Pseudo Diff. Input
Pseudo Diff. Input
Line Input (Left )
Line Input (Right )
Pseudo Diff. Input
Pseudo Diff. Input
Psuedo Diff. Input
MIC 1
MIC 2
VP
Ear Speaker Output
Speakerphone Output (Left )
Speakerphone Line Output (Right )
+ –
+ –
+ –
Line Outputs
–6 to +12 dB, 0.5 dB steps
SDIN
SDIN
SDOUT
SDOUT
SDOUT
Digital Mixer
+
MIC/Line Input Path
Auxiliary Serial Port
Audio Serial Port
Voice Serial Port
VCP +VCP_FILT –VCP_FILT
+ VCP_FILT
– VCP_FILTInverting
Step-Down
Decimator, DC Highpass Filter, Noise Gate, ALC, Volume, Mute,
Swap/Mono
Digital MIC Interface
VP
MIC2_SDETMIC 2 BiasMIC 1 Bias
MIC Bias MIC Bias Short Detect
Stereo Multi-bit ΔΣ DAC
Stereo Multi-bit ΔΣ DAC
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