STA326 STMicroelectronics, STA326 Datasheet - Page 41

• Manufacturer Part Number: STA326
• Description: DIG AUDIO SYSTEM, 2-CH, 36POWERSSOP
• Manufacturer: STMicroelectronics

Specifications of STA326

• Svhc: No SVHC (15-Dec-2010)
• No. Of Pins: 36
• Operating Temperature Range: -20°C To +85°C
• Supply Voltage Max: 36V
• Supply Voltage Min: 10V
• Termination T: RoHS Compliant
• Package / Case: PowerSO
• Interface: I2C
• Interface Type: I2C
• Rohs Compliant: Yes

STA326
and therefore the release will only occur if the limiter has already reduced the gain. The
release threshold value can be used to set what is effectively a minimum dynamic range.
This is helpful as over-limiting can reduce the dynamic range to virtually zero and cause
program material to sound “lifeless”.
In AC mode the attack and release thresholds are set relative to full-scale. In DRC mode the
attack threshold is set relative to the maximum volume setting of the channels mapped to
that limiter and the release threshold is set relative to the maximum volume setting plus the
attack threshold.
Figure 16. Basic limiter and volume flow diagram
Table 60.
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
LxA[3:0]
Limiter attack/release rate selection
3.1584
2.7072
2.2560
1.8048
1.3536
0.9024
0.4512
0.2256
0.1504
0.1123
0.0902
0.0752
0.0645
0.0564
0.0501
0.0451
Gain/Volume
Input
Attack rate
dB/ms
Gain
Doc ID 11531 Rev 3
Attenuation
Fast
Slow
Limiter
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
LxR[3:0]
Saturation
RMS
0.5116
0.1370
0.0744
0.0499
0.0360
0.0299
0.0264
0.0208
0.0198
0.0172
0.0147
0.0137
0.0134
0.0117
0.0110
0.0104
Output
Register description
Release rate
dB/ms
41/57