PDF STA538 Data sheet ( Hoja de datos )

Número de pieza	STA538
Descripción	2 x 1.3 W class-D amplifier
Fabricantes	STMicroelectronics
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No Preview Available ! STA538 2 x 1.3 W class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX Features ■ Up to 96 dB dynamic range ■ Sample rates from 8 kHz to 192 kHz ■ FFXTM class-D driver ■ 1.5 V to 1.95 V digital power supply ■ 1.5 V to 3.6 V analog power supply ■ 18-bit audio processing and class-D FFXTM modulator ■ Digital volume control: – +36 dB to 105 dB in 0.5 dB steps – Software volume update ■ Individual channel and master gain/attenuation ■ Automatic invalid input detect mute ■ 2-channel I2S input/output data interface ■ Digitally controlled POP-free operation ■ Input and output channel mapping ■ 250 mΩ output CMOS Rdson ■ > 90% efficiency ■ 2 x 1.3 W (10% THD) on 4 Ω at 3.6 V ■ 2 x 0.7 W (10% THD) on 8 Ω at 3.3 V ■ Stereo headphone plus mono speaker application: – 50 mW stereo into 32 Ω headphone, 1.2 W mono into 4 Ω speaker at 3.3 V – 100 mW stereo into 16 Ω headphone, 1.2 W mono into 4 Ω speaker at 3.3 V TFBGA48 VFQFPN52 Order codes Part number STA538B STA538Q January 2007 Rev 1 Package TFBGA48 (tube) VFQFPN52 (tube) 1/59 www.st.com 1 http://www.Datasheet4U.com 1 page STA538 1 Intr oduction Introduction The STA538 is a digital stereo class-D audio amplifier. It includes an audio DSP, a ST proprietary high-efficiency class-D driver and CMOS power output stage. It is intended for high-efficiency digital-to-power-audio conversion for portable applications. The STA538 also provides output capabilities for FFXTM. In conjunction with a power device, the STA538 provides high-quality digital amplification. The STA538 contains an on-chip volume/gain control. The PWM amplifier achieves greater than 90% efficiency for longer battery life for portable systems. The innovative class-D modulation, allows the STA538 to work without external LC filters and without a heatsink. The STA538 I2CDIS pin disables the audio DSP functions to provide a direct conversion of the input signal into output power (the I2C interface is disabled). This conversion is done without the microcontroller. The STA538 is designed for low-power operation with extremely low-current consumption in standby mode. It is available in two packages: the TFBGA48 and the VFQFPN52. These are very thin packages (1.2 mm thick) intended for small portable applications. Figure 1. Block diagram Serial digital audio interface VBIAS INL VHI VCM VLO INR PGA ADC ADC Digital volume FFX modulator OSC PWM out I/F PLL Divider Power driver Power driver Control interface OUT1A OUT1B OUT2A OUT2B 5/59 5 Page STA538 Connection diagrams and pin descriptions Table 3. Package: VFQFPN52 (continued) Pin # Name Type Description 7 VLO Analog input ADC Low reference voltage 40 FILT Analog input/output PLL loop filter terminal 42 VDDPLL Supply PLL analog supply 41 GNDPLL Ground PLL analog ground 16 OUT1A Analog output Channel 1 half-bridge A output 19 OUT1B Analog output Channel 1 half-bridge B output 25 OUT2A Analog output Channel 2 half-bridge A output 22 OUT2B Analog output Channel 2 half-bridge B output 31 POWERFAULT/ EADP Digital output Power fault signal (active high)/external audio power down signal 15 VCC1A Supply Channel 1 half-bridge A power supply 20 VCC1B Supply Channel 1 half-bridge B power supply 26 VCC2A Supply 21 VCC2B Supply Channel 2 half-bridge A power supply Channel 2 half-bridge B power supply 17 GND1A Ground Channel 1 half-bridge A power ground 18 GND1B Ground Channel 1 half-bridge B power ground 24 GND2A Ground Channel 2 half-bridge A power ground 23 GND2B Ground 30 VCC33 Supply Channel 2 half-bridge B power ground Pre-driver supply 27 GND33 Ground Pre-driver ground 13 VDD1 Supply Digital supply 12 GND1 Ground 44 VDD2 Supply Digital ground Digital supply 43 GND2 Ground Digital ground 29 VDDIO1 Supply I/O ring supply 28 GNDIO1 Ground I/O ring ground 50 VDDIO2 Supply 49 GNDIO2 Ground I/O ring supply I/O ring ground 11/59 11 Page

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