MAX98090BEWJ+T Maxim Integrated, MAX98090BEWJ+T Datasheet - Page 119

• Manufacturer Part Number: MAX98090BEWJ+T
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

MAX98090
The parametric equalizer coefficients are uninitialized at
power-up, and when used the coefficients should be pro-
grammed before the device and equalizer are enabled.
The transfer function for each band is defined as:
The biquad filter in each band has 5 user programmable
coefficients (B
Table 52. Parametric Equalizer Band N (1–7) Biquad Filter Coefficient Registers
www.maximintegrated.com
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
0x46
0x47
0x48
0x49
0x50
0x51
0x52
0x53
0x54
1
0x5C
0x5D
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
0x5E
0x5F
0x60
0x61
0x62
0x63
2
ADDRESS RANGE (BY BAND)
H(z)
0
, B
0x6B
0x6C
0x6D
0x6E
0x64
0x65
0x66
0x67
0x68
0x69
0x6A
0x6F
0x70
0x71
0x72
=
3
1
A
B
, B
0
0
2
0x7A
0x7B
0x7C
0x7D
0x7E
0x7F
+
+
0x73
0x74
0x75
0x76
0x77
0x78
0x79
0x80
0x81
, A
4
B
A
1
1
1
, and A
×
×
Z
Z
0x8C
0x8D
0x82
0x83
0x84
0x85
0x86
0x87
0x88
0x89
0x8A
0x8B
0x8E
0x8F
0x90
−
−
5
1
1
+
+
2
B
A
), and each individual
2
0x9B
0x9C
0x9D
0x9E
0x91
0x92
0x93
0x94
0x95
0x96
0x97
0x98
0x99
0x9A
0x9F
2
×
6
×
Z
Z
−
−
2
2
0xAB
0xAC
0xAD
0xAE
0xA0
0xA1
0xA2
0xA3
0xA4
0xA5
0xA6
0xA7
0xA8
0xA9
0xAA
7
Equalizer Band N
Equalizer Band N
Equalizer Band N
Equalizer Band N
Equalizer Band N
Coefficient B0
Coefficient B1
Coefficient B2
Coefficient A1
Coefficient A2
NAME
coefficient is 3 bytes (24 bits) long (A
occupy 15 consecutive registers per band for a total
of 105 consecutive registers for all 7 bands (Table 52).
Each set of three registers (per coefficient) must be pro-
grammed consecutively for the settings to take effect. The
coefficients are stored using a two’s complement format
where the first 4 bits are the integer portion and the last 20
bits are the decimal portion (which results in an approxi-
mate +8 to -8 range for each coefficient).
Ultra-Low Power Stereo Audio Codec
TYPE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
COEFFICIENT SEGMENT
B0_N[23:16]
B1_N[23:16]
B2_N[23:16]
A1_N[23:16]
A2_N[23:16]
Maxim Integrated │ 119
B0_N[15:8]
B1_N[15:8]
B2_N[15:8]
A1_N[15:8]
A2_N[15:8]
0
B0_N[7:0]
B1_N[7:0]
B2_N[7:0]
A1_N[7:0]
A2_N[7:0]
is fixed at 1). They