STA333BW STMicroelectronics, STA333BW Datasheet - Page 16

• Manufacturer Part Number: STA333BW
• Manufacturer: STMicroelectronics

Specifications of STA333BW

• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 1-Channel Mono/2-Channel Stereo
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.2@8Ohm@1W%
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): 3.3/5/9/12/15/18V
• Power Supply Requirement: Quad
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 80dB
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): 2.7/4.5V
• Dual Supply Voltage (max): 3.6/21.5V
• Operating Temp Range: -20C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 36
• Package Type: PowerSSO EP
• Lead Free Status / Rohs Status: Compliant

Processing data paths
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Processing data paths
Figure 6
processing chain is composed of two consecutive sections. In the first one, dual-channel
processing is implemented and in the second section each channel is fed into the post
mixing block either to generate a third channel (typically used in 2.1 output configuration and
with crossover filters enabled) or to have the channels processed by the DRC block (2.0
output configuration with crossover filters used to define the cut-off frequency of the two
bands).
The first section,
processing. Then a selectable high-pass filter removes the DC level (enabled if HPB = 0).
The left and right channel processing paths can include up to 8 filters, depending on the
selected configuration (bits BQL, BQ5, BQ6, BQ7 and XO[3:0]). By default, four user
programmable, independent filters per channel are enabled, plus the preconfigured
de-emphasis, bass and treble controls (BQL = 0, BQ5 = 0, BQ6 = 0, BQ7 = 0).
If the coefficient sets for the two channels are linked (BQL = 1) it is possible to use the
de-emphasis, bass and treble filters in a user defined configuration (provided the relevant
BQx bits are set). In this case both channels use the same processing coefficients and can
have up to seven filters each. If BQL = 0 the BQx bits are ignored and the fifth, sixth and
seventh filters are configured as de-emphasis, bass and treble controls, respectively.
Figure 6.
Moreover, the common 8th filter can be available on both channels provided the predefined
crossover frequencies are not used, XO[3:0] = 0, and the DRC is not used.
In the second section,
enabled they are fully user-programmable and allow the generation of a third channel
(2.1 outputs). Alternatively, in mode DRC, these blocks are used to split the sub-band and
define the cut-off frequencies of the two bands. A prescaler and a final postscaler allow full
control over the signal dynamics before and after the filtering stages. A mixer function is also
available.
Sampling
Sampling
Sampling
Sampling
frequency=Fs
frequency=Fs
frequency=Fs
frequency=Fs
From
From
From
From
I2S input
I2S input
I2S input
I2S input
interface
interface
interface
interface
and
Left and right processing, section 1
sampling
sampling
sampling
sampling
Figure 7
over
over
over
over
over
over
over
over
FIR
FIR
FIR
FIR
FIR
FIR
FIR
FIR
x2
x2
x2
x2
x2
x2
x2
x2
Figure
Sampling
Sampling
Sampling
Sampling
frequency=2xFs
frequency=2xFs
frequency=2xFs
frequency=2xFs
PreScale
PreScale
PreScale
PreScale
PreScale
PreScale
PreScale
PreScale
below show the data processing paths inside STA333BW. The whole
Figure
6, begins with a 2x oversampling FIR filter providing 2 * f
If HPB=0
If HPB=0
If HPB=0
If HPB=0
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Filter
Filter
Filter
Filter
Filter
Filter
Filter
Filter
Filter
Filter
7, mixing and crossover filters are available. If DRC is not
Doc ID 13773 Rev 3
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If DSPB=0 and C1EQBP=0
If DSPB=0 and C1EQBP=0
If DSPB=0 and C2EQBP=0
If DSPB=0 and C2EQBP=0
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User Defined Filters
User Defined Filters
User Defined Filters
User Defined Filters
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and BQL=1
and BQL=1
and BQL=1
and BQL=1
If DEMP=0
If DEMP=0
If DEMP=0
If DEMP=0
If BQ5=1
If BQ5=1
If BQ5=1
If BQ5=1
De-Emph.
De-Emph.
De-Emph.
De-Emph.
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and BQL=1
and BQL=1
and BQL=1
and BQL=1
If C1TCB=0
If C1TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
If C2TCB=0
If C2TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
If BQ6=1
If BQ6=1
If BQ6=1
If BQ6=1
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Bass
Bass
Bass
Bass
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and BQL=1
and BQL=1
and BQL=1
and BQL=1
IF BQ7=1
IF BQ7=1
IF BQ7=1
IF BQ7=1
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Treble
Treble
Treble
Treble
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STA333BW
S
audio
L
L
L
L
L
R
L
R