CS35L32 Datasheet, PDF (1/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
Boosted Class D Amplifier with Speaker-Protection Monitoring
and Flash LED Drivers
Mono Class D Speaker Amplifier
• Two-level Class G operation:
• Boosted: 5 V nominal
• Bypassed: battery voltage is supplied directly
• 2.5-mA quiescent current, monitors powered down
• 1.7 W into 8 (@ 10% THD+N)
• 102-dB signal-to-noise ratio (SNR, A-weighted)
• Idle channel noise 25 Vrms (A-weighted)
• 90% efficiency
Audio Input and Gain
• One differential analog input
• Speaker gain:
• 9, 12, 15, and 18 dB and mute
• Pop suppression, zero-crossing detect transitions
Flash LED Drivers
• Integrated dual LED drivers using the following:
• Boost supply output voltage
• Dual matched current regulators, 750 mA max each
• Programmable setting for Flash Mode current:
50–750 mA, in 50-mA steps
• Programmable setting for Flash-Inhibit Mode current:
50–350 mA, in 50-mA steps
• Programmable setting for Movie Mode current:
150, 120, 100, 80, 60, 40, 20 mA
• Programmable flash timer setting:
50–500 ms, in 25-ms steps
• Dedicated pin for flash trigger (FLEN)
• Dedicated pin for flash inhibit (FLINH)
• Thermally managed through boost-voltage regulation
(Features continue on page 2)
SPKR
VA
VP VBST SW
IREF+ _SUPPLY
FILT+
IN+
IN–

ADC
Current
Sense
Bandgap
Voltage
Generation
VCOM
Current Mode Synchronous
Boost Controller _{Soft Ramp}
Low Battery Management
VREF
Generation
VREF
+
–
9,12,15, or
18 dB + Mute
Class G
I²C Class G Override
Class D Front End
∆Σ Class D Modulator
Short Circuit Protection
Class D Power Stage
SPKR SUPPLY
MCLK
GNDA
Error
Watchdog
Serial Port
Clock Generation
Range
Scaling
LRCK _SerS_iaC_lL_AK _{udio/Data Port}

ADC

ADC
Level Shifters
FLEN FLINH FLOUT1 FLOUT2/AD0
Control,
Sensing,
and Fault
Protection
Flash LED Current Driver
GNDPLED
Temperature Overtemp
Sensor
Protection
Power
Budgeting
SPKOUT+
SPKOUT–/
VSENSE–
GNDP
VMON ADC _VSENSE+
Front End
LP _VSENSE–
IMON ADC
Front End
LP
ISENSE+
ISENSE–
I²C Control Port
ISENSE+
ISENSE–/
VSENSE+
SCLK
LRCK
SDOUT
SCL
SDA
RESET
INT
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Copyright  Cirrus Logic, Inc. 2012–2015
(All Rights Reserved)
DS963F5
AUG ‘15