SI270X-A-EVB Silicon Laboratories Inc, SI270X-A-EVB Datasheet - Page 16

• 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. Functional Description
The Si2704/05/06/07 EMI mitigating 2.1 x 5 W Class D audio amplifier integrates a stereo power stage, PWM DAC,
and digital signal processor (DSP) to enable simplified, low cost, power efficient system designs in consumer audio
electronics. The digital input amplifier features delta-sigma PWM for high quality audio while innovative EMI
mitigation technology manages PWM switching noise to suppress peak emissions more than 20 dB while providing
co-existence with AM/FM radio tuners.
The power stage is capable of driving two 3 Ω bridge-tied speakers with 5 W per channel at 10% THD+N from
6.6 V power supplies. It can also drive 8 Ω bridge-tied speakers at 3 W per channel with 88% efficiency. The power
stage feedback systems improve power supply rejection and harmonic distortion performance.
The Si270x connects up to three synchronous I
configured as input or output. The I
using an asynchronous sample rate converter (ASRC) and a digital crossbar mixer linearly combines any of the six
inputs into the three audio processing channels
Integrated digital audio processing enables the amplifier to compensate for speaker and enclosure acoustic
characteristics. A programmable 7-biquad parametric equalizer for each main channel allows notching out of
mechanical resonances and pre-compensation of the speaker frequency response, while programmable dynamic
range compression protects from overdriving speakers and increases the average output power without increasing
apparent distortion. Tone control enables ±18 dB of treble and bass boost/cut, while output volume is digitally
controlled in 0.5 dB steps from –100 to +28 dB via the I
connected to the integrated ADC. Two independent tone generators enable mixing of multi-tone alarms and alerts
into the audio channels.
The auxiliary audio processing channel (Aux Channel) with optional sub-mixing and low pass filtering generates
mono line level analog audio output for driving an external active subwoofer or center speaker. The main channel
L/R outputs may also be connected to the PWM DAC for driving a headphone amplifier.
A low jitter PLL generates internal system clocks referenced in master mode to an external crystal, or alternatively,
in slave mode to either the I
be output by the device to synchronously drive companion audio devices, additional amplifiers, and switching
regulators.
16
1.62 – 3.6 V
2.7 – 3.6 V
Supply
Supply
2-Wire Control
CLKO
MFP
I
2
S
VDD
VIO
2
S data clock (DCLK) or the audio master clock (MCLK). A buffered clock (CLKO) can
Figure 10. Functional Block Diagram
System Control
Cross-over Filter
Volume Control
2
MFP Control
Generation
Tone Control
S input is converted to a common sample rate for digital audio processing
7-Band EQ
Si270x Digital Class-D Amplifier
Tone Gen.
I
Clock
2
ASRC
DSP
Mixer
LDO
S/AAD
DRC
2
S digital sources as either master or slave, two of which can be
Rev. 0.6
PWM
PWM
Over Current
Over Temp
2
C-Compliant 2-Wire interface or an analog potentiometer
CH 1
CH 2
PWM DAC
Feedback
Power
Power
Stage
Stage
VPP
AUXOL/R
4.0 – 6.6 V
Supply
RF
LF