STA339BWS13TR STMicroelectronics, STA339BWS13TR Datasheet - Page 60

• Manufacturer Part Number: STA339BWS13TR
• Description: DIG AUDIO SYSTEM, 2-CH, 36POWERSSOP
• Manufacturer: STMicroelectronics

Specifications of STA339BWS13TR

• Svhc: No SVHC (15-Dec-2010)
• No. Of Pins: 36
• Operating Temperature Range: -20°C To +70°C
• Supply Voltage Max: 21.5V
• Supply Voltage Min: 4.5V
• Termination: RoHS Compliant
• Package / Case: PowerSSO
• Interface: I2C
• Interface Type: I2C
• Rohs Compliant: Yes

Register description
60/76
Table 71.
User-defined EQ
The STA339BWS can be programmed for four EQ filters (biquads) per each of the two input
channels. The biquads use the following equation:
Y[n] = 2 * (b
where Y[n] represents the output and X[n] represents the input. Multipliers are 24-bit signed
fractional multipliers, with coefficient values in the range of 0x800000 (-1) to 0x7FFFFF
(0.9999998808).
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
(Decimal)
Index
= b
0
* X[n] + b
0
RAM block for biquads, mixing, scaling, bass management (continued)
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0x38
0x39
0x3A
0x3B
0x3C
0x3D
0x3E
0x3F
Index (Hex)
/ 2) * X[n] + 2 * (b
1
* X[n-1] + b
Channel 1/2 - Biquad 8
for XO = 000
High-pass 2
for XO ≠ 000
Channel 3 - Biquad
for XO = 000
Low-pass 2
for XO ≠ 000
Channel 1 - Prescale
Channel 2 - Prescale
Channel 1 - Postscale
Channel 2 - Postscale
Channel 3 - Postscale
TWARN/OC - Limit
Channel 1 - Mix 1
Channel 1 - Mix 2
Channel 2 - Mix 1
Channel 2 - Mix 2
Channel 3 - Mix 1
Channel 3 - Mix 2
Unused
Unused
Doc ID 15276 Rev 3
1
2
/ 2) * X[n-1] + b
* X[n-2] - a
Description
nd
nd
order filter
order filter
1
* Y[n-1] - a
2
* X[n-2] - 2 * (a
2
C12H0(b1/2)
C12H1(b2)
C12H2(a1/2)
C12H3(a2)
C12H4(b0/2)
C3H0(b1/2)
C3H1(b2)
C3H2(a1/2)
C3H3(a2)
C3H4(b0/2)
C1PreS
C2PreS
C1PstS
C2PstS
C3PstS
TWOCL
C1MX1
C1MX2
C2MX1
C2MX2
C3MX1
C3MX2
* Y[n-2]
Coefficient
1
/ 2) * Y[n-1] - a
0x000000
0x000000
0x000000
0x000000
0x400000
0x000000
0x000000
0x000000
0x000000
0x400000
0x7FFFFF
0x7FFFFF
0x7FFFFF
0x7FFFFF
0x7FFFFF
0x5A9DF7
0x7FFFFF
0x000000
0x000000
0x7FFFFF
0x400000
0x400000
STA339BWS
Default
2
* Y[n-2]