STA30613TR STMicroelectronics, STA30613TR Datasheet - Page 29

• Manufacturer Part Number: STA30613TR
• Description: IC PROCESSOR AUD DGTL DDX 64TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA30613TR

• 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
• Other names: 497-3945-2

Writing a single coefficient to RAM
Writing a set of coefficients to RAM
The mechanism for writing a set of coefficients to RAM provides a method of updating the five coefficients cor-
responding to a given biquad (filter) simultaneously to avoid possible unpleasant acoustic side effects. When
using this technique, the 8-bit address would specify the address of the biquad b2 coefficient (e.g. 0, 5, 10, 15,
…, 50, … 195 decimal), and the STA306 will generate the RAM addresses as offsets from this base value to
write the complete set of coefficient data.
Equalization:
Figure 3. Data Flow for single channel Biquad / Bass / Treble block.:
Five user-programmable 28-bit biquads are available per channel in the STA306. These biquads run at 192kHz
for 48kHz, 96kHz, or 192kHz input and at 176.4kHz for 44.1kHz, 88.2kHz, and 176.4kHz input. The PreScale
block is used for attenuation when filters are to be designed that boost frequencies above 0dBFS. This is a
– write 8-bit address to I2C register 1Ch
– write top 8-bits of coefficient in I2C address 1Dh
– write middle 8-bits of coefficient in I2C address 1Eh
– write bottom 8-bits of coefficient in I2C address 1Fh
– write 1 to W1 bit in I2C address 2Bh
– write 8-bit starting address to I2C register 1Ch
– write top 8-bits of coefficient b2 in I2C address 1Dh
– write middle 8-bits of coefficient b2 in I2C address 1Eh
– write bottom 8-bits of coefficient b2 in I2C address 1Fh
– write top 8-bits of coefficient b0 in I2C address 20h
– write middle 8-bits of coefficient b0 in I2C address 21h
– write bottom 8-bits of coefficient b0 in I2C address 22h
– write top 8-bits of coefficient a2 in I2C address 23h
– write middle 8-bits of coefficient a2 in I2C address 24h
– write bottom 8-bits of coefficient a2 in I2C address 25h
– write top 8-bits of coefficient a1 in I2C address 26h
– write middle 8-bits of coefficient a1 in I2C address 27h
– write bottom 8-bits of coefficient a1 in I2C address 28h
– write top 8-bits of coefficient b1 in I2C address 29h
– write middle 8-bits of coefficient b1 in I2C address 2Ah
– write bottom 8-bits of coefficient b1 in I2C address 2Bh
– write 1 to WA bit in I2C address 2Ch
From
1st Interpolation
Stage
PreScale
Biquad1
Biquad2
Biquad3
Biquad4
Biquad5
Treble
Bass/
To
Volume/
Limiter
STA306
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