
HA12167FB/HA12169FB
30
Equalizer Characteristics Control Using a Bias DAC
When only one of the bias DAC channels is used, any one of the six parameters (FM, fQ, f/Q, GH, GL, and
GP) that set the equalizer’s chara cteristics can controlled by the unused bias DAC.
The figure below gives one example.
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6 bit
DAC
6 bit
DAC
BIAS ADJ (C)
BIAS ADJ (M)
BIAS ADJ (N)
GND
BIAS CONT
DAC OUT
V
CC
FM
fQ
f/Q
GH
GL
GP
HM
HN
HC
EQ-
controller
R’
GP
R
ADJ
R = R’ //
n: DAC step
GP
GP
63 R
2 n
ADJ
Figure 11 Bias DAC Control of the GP Parameter
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