sta370bws STMicroelectronics, sta370bws Datasheet - Page 2

• Manufacturer Part Number: sta370bws
• Description: 2.1-channel 40-w High-efficiency Digital Audio System Sound Terminal??
• Manufacturer: STMicroelectronics

Description
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Description
The STA370BWS is an integrated solution of digital audio processing, digital amplifier
controls and power output stage 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 STA370BWS 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 power section consists of four independent half-bridges. These can be configured via
digital control to operate in different modes.
The STA370BWS flexibility is shown by the load driving capability of 11 W into 6 Ω and 20 W
into 4 Ω with ternary modulation with a supply of 14 V.
Also provided in the STA370BWS are a full assortment of digital processing features. This
includes up to 8 programmable biquads (EQ) per channel. Special digital signal processing
techniques are available to manage low-frequency quantization noise in filters with very low
cut-off frequencies. The coefficient range -4 to +4 allows easy high-shelf filter usage and
better sound shaping. 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. Dual-band DRC dynamically equalizes
the system to provide linear frequency speaker response regardless of output power level.
This feature separates the audio frequency band into two sub-bands independently
processed to provide better sound clarity and to avoid speaker saturation.
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.
Full short-circuit protection is also embedded protecting output to GND, output to V
output to output connections. The short-circuit (fault) condition is checked at device turn-on,
so if a short circuit is detected the IC does not power up. This avoids dangerous conditions,
component break down and minimizes the return from the field.
The new F3X™ modulation, already offered within STA369BWS, is capable of digitally
filtering the PWM carrier to simplify external filtering requirements, AM interference and
EMI. F3X™ is implemented in the auxiliary output of STA370BWS and it is specifically
designed for application where a simple op-amp can be used to drive an auxiliary
headphone line.
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.
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.
Doc ID 16884 Rev 1
STA370BWS
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