SI270X-A-EVB Silicon Laboratories Inc, SI270X-A-EVB Datasheet - Page 26

• Manufacturer Part Number: SI270X-A-EVB
• Description: BOARD EVAL FOR SI270X-A
• Manufacturer: Silicon Laboratories Inc

Specifications of SI270X-A-EVB

• Board Type: Fully Populated
• Amplifier Type: Class D
• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 5W x 2 @ 3 Ohm
• Voltage - Supply: 9V
• Utilized Ic / Part: SI270X-A
• Description/function: Audio Amplifiers
• Output Power: 5 W
• Product: Audio Modules
• For Use With/related Products: Si270x
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1929

Si2704/05/06/07-A10
4.6. Digital Audio Processing (DAP)
The Si270x implements programmable digital audio processing which features volume control, dynamic range
compressor (DRC), and audio filtering such as tone control, parametric equalization, crossover, and de-emphasis.
The three channel digital audio processing chain for the Si2707 is shown in Figure 20.
As outlined in "4.5. Digital Audio I2S Interface " on page 24, the crossbar mixer combines the selected audio
sources and outputs the corresponding Left and Right main channels and an Aux Channel containing any linear
combination of the inputs. The Aux Channel can either be disabled completely, configured as a mono low pass
subwoofer channel, or as a mono full bandwidth center channel according to system requirement.
To make all downstream audio processing independent of the input I
sample rate converter (ASRC) normalizes the input rate to 48 kHz.
Refer to the “AN469: Si270x Programming Guide” for more information on the complete range of programming
parameters and settings requested for operation of the digital audio processing features.
26
48.0 kHz
44.1kHz
32.0
48.0
Treble/Bass Shelving Filters
Figure 20. Signal Processing Chain
7 Bi-Quad Parametric EQ
HP Cross Over Filter
Asynchronous Sample Rate Converter
channel
Volume Balance
Left
Dynamic Range Compression
Input 1
L
I
ß
ß
2
L1
L2
S
DC Notch Filter
channel
Crossbar Mixer
Volume Master
De-Emphasis
Right
Rev. 0.6
Limiter
Input 2
R
I
ß
ß
2
R1
R2
S
Tone1
Tone2
Input 3
I
2
S
2 Bi-Quad EQ
Volume Aux
ß
ß
LP X-over
M 1
M 2
channel
L+R
2
Aux
2
S clock frequencies, an asynchronous