STA308A STMicroelectronics, STA308A Datasheet - Page 28

• 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

Registers
28/63
In dynamic range compression mode the limiter threshold values vary with the volume
settings allowing a nighttime listening mode that provides a reduction in the dynamic range
regardless of the volume level.
By setting this bit to one de-emphasis will implemented on all channels. When this is used it
takes the place of biquad #7 in each channel and any coefficients using biquad #1 will be
ignored. DSPB (DSP bypass) bit must be set to 0 for de-emphasis to function.
Post-Scale functionality can be used for power-supply error correction. For multi-channel
applications running off the same power-supply, the post-scale values can be linked to the
value of channel 1 for ease of use and update the values faster.
For ease of use, all channels can use the biquad coefficients loaded into the channel 1
Coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to
be performed once.
2
3
4
7:5
000
001
010
011
100
Bit
Bit
Bit
Bit
PWMS[1:0]
RW
RW
RW
RW
RW
RW
RW
RW
0
0
0
00
RST
RST
RST
RST
Normal speed (384 kHz) (all channels
Half-speed (192 kHz) (all channels
Double-speed (768 kHz) (all channels
Normal speed (channels 1-6), double-speed (channels 7-8)
Odd speed (341.3 kHz) (all channels)
DEMP
PSL
BQL
PWMS[2:0]
Name
Name
Name
Name
De-emphasis:
0: no de-emphasis
1: de-emphasis
Post-scale link:
0: each channel uses individual post-scale value
1: each channel uses channel 1 post-scale value
Biquad link:
0: each channel uses coefficient values
1: each channel uses channel 1 coefficient values
PWM speed selection:
PWM output speed
Description
Description
Description
Description
STA308A