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CXA3785R [Audio Driver for TV]

>>Description

The CXA3785R is an integrated audio sub-system designed for TV audio application. It has a stereo headphone amplifier, and 4 stereo amplifiers. It also integrated gain control, mute control, input selector, and voltage detectors. Each settable value is controlled through I²C compatible interface.

>>Features

4 stereo audio amplifiers (HP, AMP1, AMP2, AMP3) with programmable gain control
Cap less headphone amplifier
2 amplifiers (HP and AMP1) with 3rd order LPF for PWM input
AMP3 with 2 stereo input multiplexer and LL/RR output
AMP4 for Digital Media Port (DMP) with differential input
4 voltage detection circuits for VUNREG (un-regulated power supply voltage), REGAUD (audio amp power supply voltage), REG33 (DSP power supply voltage) and speaker output
3 muting circuits with external mute control and buffer transistor
REGAUD output for supply voltage of 4 stereo audio amplifiers and DMP
REG33 output for supply voltage of DSP and PWM output stage
I²C control
Package size: 64pin LQFP (Body size: 10mm × 10mm)

>>Absolute Maximum Ratings

Item	Symbol	Rating	Unit
Supply voltage	Vcc	24.0	V
	VUNREG	24.0	V
	DVDD	4.5	V
Operating temperature	TA	−25 to +85	ºC
Storage temperature	Tstg	−55 to +125	ºC
Junction temperature	TJ(max)	−25 to +85	ºC
Power dissipation	PD	(TJ(max) – TA) / θJA^*1	−
Thermal impedance	θJA	80	ºC/W
Thermal impedance	θJC	20	ºC/W

*1 Glass fabric base epoxy two-layer board, 76mm × 114mm, t = 1.6mm

>>Recommended Operating Conditions

Item	Symbol	Min.	Typ.	Max.	Condition	Unit
Supply voltage	Vcc	8.0	12.0	13.0	Vcc = REGAUD	V
	VUNREG	11.5	15.0	18.0	VUNREG – REGAUD ≥ 2.5V	V
	DVDD	3.0	3.3	3.6		V
Operating ambient temperature	Topt	–25	–	+85		ºC

Sony reserves the right to change products and specifications without prior notice.

This IC is ESD sensitive device. Special handling precautions are required.

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