SI2707-A10-GM Silicon Laboratories Inc, SI2707-A10-GM Datasheet - Page 29

• Manufacturer Part Number: SI2707-A10-GM
• Description: AMPLIFIER AUDIO CLASS D 24QFN
• Manufacturer: Silicon Laboratories Inc
• Type: Class Dr

Specifications of SI2707-A10-GM

• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Package / Case: 24-VFQFN Exposed Pad
• Max Output Power X Channels @ Load: 5W x 2 @ 3 Ohm
• Voltage - Supply: 4 V ~ 6.6 V
• Features: Depop, I²S, Short-Circuit and Thermal Protection, Tone and Volume Control
• Mounting Type: Surface Mount
• Product: Class-D
• Output Power: 5 W
• Thd Plus Noise: 0.1 %
• Supply Current: 100 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Input Offset Voltage: Minimum Operating Temperature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-1928

Si2704/05/06/07-A10
4.6.6. Dynamic Range Compression (Si2706/07 only)
The Si2706/07 features dynamic range compression (DRC) with programmable linear gain, compression
threshold, compression ratio, look ahead time, attack rate, and release rate.
DRC increases the net output power without clipping by decreasing the peak amplitudes of audio signals and
increasing the rms content of the lower amplitude audio signal. Audio signals below the threshold are increased by
the linear gain and audio signals above the threshold are compressed by a pre-defined compression ratio.
Figure 23 shows a plot of dynamic range compression audio processing with the DRC_THRESHOLD parameter
set at –40 dBFS, DRC_GAIN parameter at +20 dB relative to an uncompressed transfer function and
DRC_SLOPE set for a 2:1 compression ratio. For input signals below the compression threshold of –40 dBFS, the
output signal is increased by 20 dB relative to the input signal. For input signals above the compression threshold
the input signal is increased by 1 dB for every 2 dB increase in audio input level.
Figure 23. Dynamic Range Compression Example
In this example, the input dynamic range of 90 dB is reduced to an output dynamic range of 70 dB.
Figure 24 shows the time domain response of the dynamic range compression. The DRC_ATTACK_TIME
parameter sets how quickly the gain compression responds to changes in the input level, and the
DRC_RELEASE_TIME parameter sets how quickly the gain compression returns to linear gain once the audio
input level drops below the compression threshold.
DRC_LOOKAHEAD_TIME allows setting the look ahead time that permits the DRC circuit to adjust the
compression to sudden level changes thus preventing the clipping of the fast changing signal. Refer to “AN503:
Si270x Class-D Amplifier—Dynamic Range Compressor Use” for additional information.
Rev. 0.6
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