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STA529
2 x 100 mW class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX
Data Brief
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 1.95 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 m output CMOS Rdson > 90% efficiency Stereo headphone plus mono speaker application: - 50 mW stereo into 32 headphone - 100 mW stereo into 16 headphone TFBGA48

VFQFPN52
Order codes
Part number STA529B STA529Q Package TFBGA48 VFQFPN52 Packaging Tube Tube
December 2006
Rev 1
1/4
www.st.com 1
For further information contact your local STMicroelectronics sales office.
Introduction
STA529
Introduction
The STA529 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 STA529 also provides output capabilities for FFXTM. In conjunction with a power device, the STA529 provides high-quality digital amplification. The STA529 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 STA529 to work without external LC filters and without a heatsink. The STA529 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 STA529 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
LRCLKO/PWM1B SDATAO/PWM2A BICLKO/PWM1A POWERFAULT/ EADP
LRCLKI
SDATAI
RST_N STBY
GNDIO
GND33
MUTE
VDDIO
VCC33
BICLKI
GND2
GND1
Serial digital audio interface Power driver Digital volume
MUX OUT1A OUT1B MUX
TM
VBIAS INL VHI VCM VLO INR
FFX modulator Power driver PWM out I/F Control interface
OUT2A OUT2B
ADC
PGA ADC OSC PLL
Divider
SELCLK33
CLKOUT/ PWM2B
XTI
MCLK33
GNDPLL
FILT VDDPLL
2/4
I2CDIS
AVCC
AGND
XTO
SDA
SCL
VCC2
VCC1
GND
VDD
MUX
STA529
Revision history
Revision history
Table 1.
Date 18-Dec-2006
Document revision history
Revision 1 Initial release Changes
3/4
STA529
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