Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsLinear ICsLinear IC - Custom audio Pre-amp I²S PowerSSO 36

This is information on a product in full production.

March 2012 Doc ID 13177 Rev 6 1/21

STA333ML

2-channel microless high-efficiency digital audio system

Sound Terminal

Datasheet − production data

Features

■ Wide supply voltage range (4.5 - 20 V)

■ 2 x 20 W into 8 Ω at V

= 18 V

■ PowerSSO-36 exposed pad 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 I

S 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

■ Embedded thermal overload and short-circuit

protection

■ Filterless configuration option

Applications

■ LCDs

■ DVDs

■ Cradles

■ Digital speakers

■ Wireless speaker cradles

Description

The STA333ML is a single die embedding digital

audio processing and high-efficiency power

amplification, capable of operating without the aid

of an external microcontroller.

The STA333ML 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 STA333ML combines a unique 24-bit DDX

digital class-D ternary modulator together with an

extremely low R

dsON

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 (cradles, digital speakers, audio

terminals) where no microcontroller is needed.

The serial audio data interface accepts the

universally used I

S format. Basic features, such

as the oversampling clock, gain, and I

S format,

can be set using a minimal number of selection

pins.

The STA333ML 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.

PowerSSO-36

with exposed

pad down (EPD)

Table 1. Device summary

Order code Package Packaging

STA333ML PowerSSO-36 EPD Tube

STA333ML13TR PowerSSO-36 EPD Tape and reel

www.st.com

Summary of content (21 pages)

PAGE 1
STA333ML 2-channel microless high-efficiency digital audio system Sound Terminal ® Datasheet − production data Features PowerSSO-36 ■ Wide supply voltage range (4.
PAGE 2
Contents STA333ML Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 5 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Thermal data . . . . . . . . . .
PAGE 3
STA333ML 1 Block diagram Block diagram Figure 1.
PAGE 4
Pin description 2 STA333ML Pin description Figure 2. Table 2. Pin connections (top view) GND_SUB 1 36 VDD_DIG FMT 2 35 GND_DIG TEST_MODE 3 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 28 BICKI OUT1B 10 27 XTI VCC1 11 26 GND_PLL GND1 12 25 FILTER_PLL OUT1A 13 24 VDD_PLL GND_REG 14 23 PWRDN 22 GND_DIG VDD_REG 15 CONFIG 16 21 VDD_DIG N.C. 17 20 N.C. N.C. 18 19 N.C.
PAGE 5
STA333ML 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. - Not connected 18 N.C. - Not connected 19 N.C. - Not connected 20 N.C.
PAGE 6
Electrical specifications STA333ML 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol 3.2 Parameter Min Unit Power supply voltage (pins VCC1, VCC2) - - 23 V VL Logic input interface -0.
PAGE 7
STA333ML 3.4 Electrical specifications Electrical specifications - digital section Table 6. Symbol Iil Iih 3.5 Electrical specifications for digital section Parameter Conditions Input current without bias device Min Typ Max Unit Vi = 0 V -10 - 10 µA Vi = VDD = 3.6 V -10 - 10 µA Vil Low-level input voltage - - - 0.2 * VDD V Vih High-level input voltage - 0.8 * VDD - - V Vol Low-level output voltage Iol = 2 mA - - 0.
PAGE 8
Electrical specifications Table 7. Symbol Electrical specifications for power section (continued) Parameter Conditions Min Typ Max Unit Supply current from VCC in power down PWRDN = 0 0.03 0.06 0.2 mA Supply current from VCC in operation PCM Input signal = -60 dBFs. Switching frequency = 384 kHz No LC filters - 30 50 mA Supply current DDX processing (reference only) Internal clock = 49.
PAGE 9
STA333ML 3.6 Electrical specifications Power-on sequence Figure 3. Power-on sequence VCC Don’t care VDD_Dig XTI Don’t care Reset TR PWDN TR = minimum time between XTI master clock stable and reset removal: 1 ms Note 1: clock stable means: fmax - fmin < 1 MHz Note 2: No specific VCC and VDD turn-on sequence is required. 3.7 Test circuits Figure 4.
PAGE 10
Functional description STA333ML 4 Functional description 4.1 Serial audio interface protocols The STA333ML serial audio input interfaces with standard digital audio components and accepts serial data formats. The STA333ML always acts as a slave when receiving audio input from standard digital audio components. Serial data for two channels is provided using 3 input pins: left/right clock LRCKI (pin 29), serial clock BICKI (pin 28), and serial data SDI (pin 30).
PAGE 11
STA333ML 4.2 Functional description Fault-detect recovery bypass The on-chip power output block provides feedback to the digital controller using inputs to the power control block. The fault input is used to indicate a fault condition (either overcurrent or thermal).
PAGE 12
Applications STA333ML 5 Applications 5.1 Applications schematic Figure 8 on page 13 shows the schematic of a typical application for the STA333ML. Concerning the power supplies, take care when designing the PCB layout. In particular, the 3.3-Ω resistors on the digital supplies (VDD_DIG) must be placed as close as possible to the device. This helps to prevent parasitic oscillation in the digital part of the device due to the inductive tracks of the PCB.
PAGE 13
Application schematic STA333ML Figure 8. +3.3V L1 J1-3 19 20 21 22 Doc ID 13177 Rev 6 23 PWDN +3.3V 24 25 5 26 R4 2.2K C9 680p C6 100n 5 C7 100n C8 4.7n 22uH STA333ML C4 100n 27 MCLK 28 BICLK 29 LRCLK 30 SDI RESET 31 INT_LINE 32 OVERSAMPLING_SEL 33 GAIN_SEL 34 35 +3.3V C3 100n 36 N.C. N.C. N.C. N.C.
PAGE 14
Applications 5.2 STA333ML Internal voltage reference An embedded voltage regulator produces the reference voltages for the DMOS bridge driver. It requires two 100 nF capacitors to keep the regulator stable. The capacitors should be place close to the pins. Figure 9. Reference voltage block diagram VCC VCC_REG 100 nF Regulator VSS_REG Driver P VDD_REG 100 nF GND_REG Input level shifter Driver N I2 S interface GND 5.
PAGE 15
STA333ML 5.4 Applications Typical output configuration Figure 11 and Figure 12 show the typical output circuits used for the BTL stereo mode. Figure 11.
PAGE 16
Applications STA333ML Figure 12. Filterless output configuration OUT1A 22R Left 330 pF OUT1B OUT2A 22R Right 330 pF OUT2B The filterless application is more critical in terms of EMI. It is quite important to follow the below suggestions: ● Tracks from amplifier to speaker should be as short as possible. ● Ferrite beads can be used (instead of coils) to improve EMI performance. – Ferrite beads must have a low impedance in the audio band and high impedance at high frequencies.
PAGE 17
STA333ML 6 Package thermal characteristics Package thermal characteristics Using a double layer PCB the thermal resistance junction to ambient with 2 copper ground areas of 3 x 3 cm2 and with 16 via holes (see Figure 13) is 24 °C/W in natural air convection. The dissipated power within the device depends primarily on the supply voltage, load impedance and output modulation level. The max estimated dissipated power for the is: 2 x 20 W into 8 Ω, at 18 V Pd max is approximately 4 W Figure 13.
PAGE 18
Package mechanical data 7 STA333ML Package mechanical data Figure 15 shows the package outline and Table 8 gives the dimensions. h x 45° Figure 15.
PAGE 19
STA333ML Package mechanical data Table 8. PowerSSO-36 EPD dimensions Dimensions in mm Dimensions in inches Symbol Min Typ Max Min Typ Max A 2.15 - 2.47 0.085 - 0.097 A2 2.15 - 2.40 0.085 - 0.094 a1 0.00 - 0.10 0.00 - 0.004 b 0.18 - 0.36 0.007 - 0.014 c 0.23 - 0.32 0.009 - 0.013 D 10.10 - 10.50 0.398 - 0.413 E 7.40 - 7.60 0.291 - 0.299 e - 0.5 - - 0.020 - e3 - 8.5 - - 0.335 - F - 2.3 - - 0.091 - G - - 0.10 - - 0.004 H 10.
PAGE 20
Revision history 8 STA333ML Revision history Table 9. Document revision history Date Revision 1-Feb-2007 1 Initial release 2-May-2008 2 Package information update 3 Added Table 6: Electrical specifications for digital section on page 7 Updated Table 7: Electrical specifications for power section on page 7 Added Section 3.
PAGE 21
STA333ML Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.