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APA2120/1 is a monolithic integrated circuit, which provides precise DC volume control, and a stereo bridged audio power amplifiers capable of producing 2.7W(2.0W) into 3 with less than 10% (1.0%) THD+N. The attenuator range of the volume control in APA2120/1 is from 20dB (DC_Vol=0V) to -80dB (DC_Vol=3.54V) with 32 steps. The advantage of internal gain setting can be less components and PCB area. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA2120/1, that reduce pops and clicks noise during power up or shutdown mode operation. It also improves the power off pop noise and protects the chip from being destroyed by over temperature and short current failure. To simplify the audio system design, APA2120/1 combines a stereo bridge-tied loads (BTL) mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a single chip, where both modes are easily switched by the SE/BTL input control pin signal. Besides, the multiple input selection is used for portable audio system.
APA2120 Maximum Ratings
Symbol
Parameter
Rating
Unit
VDD
Supply Voltage
-0.3 to 6
V
VIN
Input Voltage Range, SE/BTL, HP/LINE, SHUTDOWN, PCBEN
-0.3 to VDD+0.3
V
TA
Operating Ambient Temperature Range
-40 to 85
TJ
Maximum Junction Temperature
Internally Limited*1
TSTG
Storage Temperature Range
-65 to +150
TS
Soldering Temperature, 10 seconds
260
VESD
Electrostatic Discharge
-3000 to 3000*2 -200 to 200*3
V
PD
Power Dissipation
Internally Limited
Note: 1.APA2120/1 integrated internal thermal shutdown protection when junction temperature ramp up to 150°C 2.Human body model: C=100pF, R=1500, 3 positives pulse plus 3 negative pulses 3.Machine model: C=200pF, L=0.5F, 3 positive pulses plus 3 negative pulses
APA2120 Features
` Low operating current with 14mA ` Improved depop circuitry to eliminate turn-on and turn off transients in outputs ` High PSRR ` 32 steps volume adjustable by DC voltage with hysteresis ` 2W per channel output power into 4 load at 5V, BTL mode ` Two output modes allowable with BTL and SE modes selected by SE/BTL pin ` Low current consumption in shutdown mode (50A) ` Short Circuit Protection ` Power off depop circuit integration ` TSSOP-24 with or without thermal pad package