ST STA335ML User Manual

STA335ML

2-channel microless high-efficiency digital audio system Sound Terminal®

Features

■Wide supply voltage range (5.0 V to 26 V)

■PowerSSO-36 exposed pad down package

■2 channels of 24-bit DDX®

■100-dB SNR and dynamic range

■Selectable 32 kHz to 48 kHz input sample rates

■Automatic zero-detect mute

■Automatic invalid input detect mute

■2-channel I2S input data interface

■Selectable clock input ratio (256 or 364 * fs)

■Max power correction for lower full power

■96-kHz internal processing sample rate, 24-bit precision

■Thermal overload and short-circuit protection embedded

■Filterless configuration capability

Applications

■LCDs

■DVDs

■Cradles

■Digital speakers

■Wireless speaker cradles

PowerSSO-36

with exposed pad down (EPD)

Description

The STA335ML is a single die embedding digital audio processing and high-efficiency power amplification, capable of operating without the aid of an external microcontroller.

The STA335ML is part of the Sound Terminal® family that provides full digital audio streaming to the speakers and offers cost effectiveness, low power dissipation and sound enrichment.

The STA335ML combines a unique 24-bit DDX® digital class-D ternary modulator together with an extremely low RdsON stereo power DMOS stage. The latter is capable of a total output power of

2 x 20 W with outstanding performance in terms of efficiency (>90 %), THD, SNR and EMI.

The microless feature allows its use in low-cost applications (cradle, digital speakers, audio terminals) where no microcontroller is needed.

The serial audio data interface accepts the universally used I2S format. Basic features, such as oversampling clock, gain, I2S format can be set using a minimal number of selection pins.

The STA335ML is self-protected against thermal overload, overcurrent, short-circuit and overvoltage conditions.

The fault condition is also signalled on an external pin (INT_LINE) for specific requirements.

Table 1.	Device summary
	Order code	Package	Packaging
STA335MLJ		PowerSSO-36 EPD	Tube
STA335MLJ13TR		PowerSSO-36 EPD	Tape and reel
July 2011		Doc ID 17638 Rev 4	1/20
			www.st.com

STA335ML

Contents

1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4
3	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6
	3.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	3.2	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	3.3	Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	3.4	Electrical specifications - digital section . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	3.5	Electrical specifications - power section . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	3.6	Power-on sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	3.7	Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
4	Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
	4.1	Serial audio interface protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	4.2	Fault-detect recovery bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.3	Zero-detect mute enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.4	Fade-in/out feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.5	Oversampling selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.6	Gain selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.7	Power-down function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
5	Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	5.1	Applications schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	5.2	Internal voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	5.3	PLL filter schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	5.4	Typical output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
6	Package thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		16
7	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17
8	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		19

2/20	Doc ID 17638 Rev 4

STA335ML	Block diagram

1 Block diagram

Figure 1. Block diagram

		Protection
I2S		current/thermal
			Channel
interface
			1A
			Channel
	Power	Logic	1B
Volume	control
control	DDX
			Channel
			2A
		Regulators
PLL			Channel
			2B
		Bias

Doc ID 17638 Rev 4

3/20

Pin description	STA335ML

2 Pin description

Figure 2. Pin connections (top view)

GND_SUB		1														36			VDD_DIG
FMT		2														35			GND_DIG
		3
TEST_MODE																34			GAIN
VSS_REG		4															33		ONSEL
VCC_REG		5															32		INT_LINE
OUT2B		6															31		RESET
GND2		7															30		SDI
VCC2		8															29		LRCKI
OUT2A		9																	BICKI
																	28
OUT1B		10																	XTI
																	27
VCC1		11																	GND_PLL
																	26
GND1		12															25		FILTER_PLL
OUT1A		13															24		VDD_PLL
GND_REG		14															23		PWRDN
VDD_REG		15	EP, exposed								pad					22			GND_DIG
			(device ground)
CONFIG		16														21			VDD_DIG
N.C.		17														20			N.C.
N.C.		18														19			N.C.

Table 2.	Pin description
Pin	Name	Type	Description
1	GND_SUB	Gnd	Substrate ground
			Serial format:
2	FMT	In	0: I2S format
			1: left justified
3	TEST_MODE	In	This pin must be connected to GROUND
4	VSS_REG	Analog	Internal reference at VCC - 3.3 V
5	VCC_REG	Analog	Internal VCC reference
6	OUT2B	Out	Output half-bridge 2B
7	GND2	Gnd	Power negative supply
8	VCC2	Power	Power positive supply
9	OUT2A	Out	Output half-bridge 2A
10	OUT1B	Out	Output half-bridge 1B

4/20	Doc ID 17638 Rev 4

STA335ML					Pin description
	Table 2.	Pin description	(continued)
	Pin	Name		Type	Description
	11	VCC1		Power	Power positive supply
	12	GND1		Gnd	Power negative supply
	13	OUT1A		Out	Output half-bridge 1A
	14	GND_REG		Analog	Internal ground reference
	15	VDD_REG		Analog	Internal 3.3-V reference voltage
	16	CONFIG		In	Configuration mode, must be connected to ground
	17	N.C.		-	No internal connection
	18	N.C.		-	No internal connection
	19	N.C.		-	No internal connection
	20	N.C.		-	No internal connection
	21	VDD_DIG		Power	Positive supply digital
	22	GND_DIG		Gnd	Digital ground
					Power down:
	23	PWRDN		In	0: low-power mode
					1: normal operation
	24	VDD_PLL		Power	Positive supply for PLL
	25	FILTER_PLL		In	Connection to PLL filter
	26	GND_PLL		Gnd	Negative supply for PLL
	27	XTI		In	PLL input clock, 256 * fs or 384 * fs
	28	BICKI		In	I2S serial clock
	29	LRCKI		In	I2S left/right clock
	30	SDI		In	I2S serial data channel
	31	RESET		In	Reset
	32	INT_LINE		Out	Fault interrupt
					Oversampling selector:
	33	ONSEL		In	0: 256 * fs
					1: 384 * fs
					Gain selector:
	34	GAIN		In	0: 0 dBFs
					1: 24 dBFs
	35	GND_DIG		Gnd	Digital ground
	36	VDD_DIG		Power	Digital supply
	-	EP		-	Exposed pad for PCB heatsink, to be connected to
					ground plane

Doc ID 17638 Rev 4

5/20

Electrical specifications	STA335ML

3 Electrical specifications

3.1Absolute maximum ratings

Table 3.	Absolute maximum ratings
Symbol	Parameter	Min		Typ	Max	Unit
VCC	Power supply voltage (pins VCC1, VCC2)	-	-		30	V
VL	Logic input interface	-0.3	-		4	V
VDD	Digital supply (pin VDD_DIG)	-	-		4	V
Top	Operating junction temperature	-20	-		150	°C
Tstg	Storage temperature	-40	-		150	°C

3.2Thermal data

Table 4.	Thermal data
Symbol	Parameter	Min	Typ	Max	Unit
RTh(j-case)	Thermal resistance junction to case (thermal pad)	-	1.5	2	°C/W
Tsd	Thermal shutdown junction temperature	140	-	150	°C
Thsd	Thermal shutdown hysteresis	18	20	22	°C
Tw	Thermal warning temperature	120	130	140	°C

3.3Recommended operating conditions

Table 5.	Recommended operating conditions
Symbol	Parameter	Min	Typ	Max	Unit
VCC	Power supply voltage (pins VCC1, VCC2)	5	-	26	V
VL	Logic input interface	2.7	3.3	3.6	V
VDD	Digital supply (pin VDD_DIG)	2.7	3.3	3.6	V
Tamb	Ambient temperature	-20	-	70	°C

6/20	Doc ID 17638 Rev 4