AD1986ABSTZ datasheet(37/56 Pages) AD

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AD1986A

Rev. 0 | Page 37 of 56

EQ CONTROL REGISTER (REGISTER 0x60)

Register 0x60 is a read/write register that controls equalizer function and data setup. The register also contains the biquad and coefficient

address pointer, which is used in conjunction with the EQ data register (0x78) to set up the equalizer coefficients. The reset default

disables the equalizer function until the coefficients can be properly set up by the software and sets the symmetry bit to allow equal

coefficients for left and right channels.

Reg

Name

D15

D14

D13

D12

D11

D10

Default

0x60

Control

EQM

SYM

CHS

BCA5

BCA4

BCA3

BCA2

BCA1

BCA0

0x8080

Table 99. Biquad and Coefficient Address Pointer

BCA [5,0]

Biquad 0

Coef a0

BCA [5,0] = 011011

Biquad 0

Coef a1

BCA [5,0] = 011010

Biquad 0

Coef a2

BCA [5,0] = 011001

Biquad 0

Coef b1

BCA [5,0] = 011101

Biquad 0

Coef b2

BCA [5,0] = 011100

Biquad 1

Coef a0

BCA [5,0] = 100000

Biquad 1

Coef a1

BCA [5,0] = 011111

Biquad 1

Coef a2

BCA [5,0] = 011110

Biquad 1

Coef b1

BCA [5,0] = 100010

Biquad 1

Coef b2

BCA [5,0] = 100001

Biquad 2

Coef a0

BCA [5,0] = 100101

Biquad 2

Coef a1

BCA [5,0] = 100100

Biquad 2

Coef a2

BCA [5,0] = 100011

Biquad 2

Coef b1

BCA [5,0] = 100111

Biquad 2

Coef b2

BCA [5,0] = 100110

Biquad 3

Coef a0

BCA [5,0] = 101010

Biquad 3

Coef a1

BCA [5,0] = 101001

Biquad 3

Coef a2

BCA [5,0] = 101000

Biquad 3

Coef b1

BCA [5,0] = 101100

Biquad 3

Coef b2

BCA [5,0] = 101011

Biquad 4

Coef a0

BCA [5,0] = 101111

Biquad 4

Coef a1

BCA [5,0] = 101110

Biquad 4

Coef a2

BCA [5,0] = 101101

Biquad 4

Coef b1

BCA [5,0] = 110001

Biquad 4

Coef b2

BCA [5,0] = 110000

Biquad 5

Coef a0

BCA [5,0] = 110100

Biquad 5

Coef a1

BCA [5,0] = 110011

Biquad 5

Coef a2

BCA [5,0] = 110010

Biquad 5

Coef b1

BCA [5,0] = 110110

Biquad 5

Coef b2

BCA [5,0] = 110101

Biquad 6

Coef a0

BCA [5,0] = 111001

Biquad 6

Coef a1

BCA [5,0] = 111000

Biquad 6

Coef a2

BCA [5,0] = 110111

Biquad 6

Coef b1

BCA [5,0] = 111011

Biquad 6

Coef b2

BCA [5,0] = 111010

Table 100.

Function

Swaps the blocks that are used for symmetry coefficients. Only valid when the SYM bit is set.

CHS

Function

Default

Selects left channel coefficients’ data block

Default

CHS

(Channel

Select)

Selects right channel coefficients’ data block

When set to 1 this bit indicates that the left and right channel coefficients are equal.

This shortens the coefficients setup sequence since only the left channel coefficients need to be addressed and set up. The

right channel coefficients are simultaneously copied into memory.

SYM

Function

Left and right channels can use different coefficients

SYM

(Symmetry)

Indicates that the left and right channel coefficients are equal

Default

When set to 1, this bit disables the equalizer function (allows all data to pass through). The reset default sets this bit to 1,

disabling the equalizer function until the biquad coefficients can be properly set.

EQM

Function

EQ is enabled.

EQM

(Equalizer

Mute)

EQ is disabled. Data will pass-through without change.

Default

Reserved.

Default: 0

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