STA308A STMicroelectronics, STA308A Datasheet - Page 56

• Manufacturer Part Number: STA308A
• Description: IC AUDIO PROCESSOR DGTL 64-TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA308A

• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Lead Free Status / Rohs Status: Compliant

Equalization and mixing
8
8.1
56/63
Equalization and mixing
Figure 8.
Post-scale
The STA308A provides one additional multiplication after the last interpolation stage and
before the distortion compensation on each channel. This is a 24-bit signed fractional
multiply.
The scale factor for this multiply is loaded into RAM using the same I
biquad coefficients and the bass-management.
This post-scale factor can be used in conjunction with an ADC equipped micro-controller to
perform power-supply error correction. All channels can use the channel 1 by setting the
post-scale link bit.
Table 9.
0
1
2
3
(decimal)
Index
Channel mixer
RAM block for biquads, mixing, and bass management
0x00
0x01
0x02
0x03
Index
(hex)
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Channel 1 - Biquad 1
CxMIX1
CxMIX2
CxMIX3
CxMIX4
CxMIX5
CxMIX6
CxMIX7
CxMIX8
C1H10 (b1/2)
C1H11 (b2)
C1H12 (a1/2)
C1H13 (a2)
Coefficient
Channel x
2
C registers as the
0x000000
0x000000
0x000000
0x000000
Default
STA308A