STA333BW_11 STMICROELECTRONICS [STMicroelectronics], STA333BW_11 Datasheet - Page 8

• Manufacturer Part Number: STA333BW_11
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Description
1
8/67
Description
The STA333BW is an integrated solution of digital audio processing, digital amplifier
controls and power output stages to create a high-power single-chip FFX digital amplifier
with high-quality and high-efficiency. Three channels of FFX processing are provided. The
FFX processor implements the ternary, binary and binary differential processing capabilities
of the full FFX processor.
The STA333BW is part of the Sound Terminal
streaming to the speakers and offers cost effectiveness, low power dissipation and sound
enrichment.
The power section consists of four independent half-bridges. These can be configured via
digital control to operate in different modes.
For example, 2.1 channels can be provided by two half-bridges and a single full-bridge,
supplying up to 2 x 9 W + 1 x 20 W of output power or two channels can be provided by two
full-bridges, supplying up to 2 x 20 W of output power.
The IC can also be configured as 2.1 channels with 2 x 20 W supplied by the device plus a
drive for an external FFX power amplifier, such as STA533WF or STA515W.
The serial audio data input interface accepts all possible formats, including the popular I
format. The high-quality conversion from PCM audio to FFX PWM switching provides over
100 dB of SNR and of dynamic range.
Also provided in the STA333BW are a full assortment of digital processing features. This
includes up to 5 programmable biquads (EQ) per channel. Available presets enable a
time-to-market advantage by substantially reducing the amount of software development
needed for functions such as audio preset volume loudness, preset volume curves and
preset EQ settings. There are also new advanced AM radio interference reduction modes.
The DRC dynamically equalizes the system to provide a linear frequency speaker response
regardless of output power level.
Figure 1.
interface
Volume
control
I
2
PLL
S
Block diagram
Digital DSP
FFX
Power
control
I
2
C
Doc ID 13773 Rev 3
current / thermal
®
Protection
Regulators
family that provides full digital audio
Logic
Bias
Power
Channel
Channel
Channel
Channel
2A
1A
1B
2B
STA333BW
2
S