AS3658F-BCTP datasheet(100/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption- Audio Functi ons

9.7

Five Band Equalizer

The 5 Band equalizer is build of one low pass, one high pass and 3 band pass filter, and is optimized for 44.1kHz

sample frequency:

Low pass filter: 200Hz ( when programming negaitve gain values, this filter changes to a HP filter)

Band pass filter1: 340Hz / Q=1.0 (when programming negative gain values, this filter changes to a notch filter)

Band pass filter2: 1100Hz / Q=0.7 (when programming negative gain values, this filter changes to a notch filter)

Band pass filter3: 3375Hz / Q=1.0 (when programming negative gain values, this filter changes to a notch filter)

High pass filter: 5940Hz (when pragramming negative gain values, this filter changes to a LP filter)

The Q factors and the cut off frequency of the High and low pass filter are measured at 50% gain and are valid for

+6dB amplification of each band.

The attenuation or amplification of each band can be dynamically adjusted by the serial interface. Additional a pre-gain

stage can adjust the input level. This gain stage is after the 16 to 24 bit extension and therefore additional gain, which

is compensated with the equalizer filter itself (eq_lp_gain, eq_band1,2,3_gain, eq_hp_gain) will not cause clipping:

Figure 45. Equalizer Block Diagram

Table 103. LINE_IN_L Register

Addr:86

LINE_IN_L

These bits control the LINE_IN volume and functions

Bit

Bit Name

Default

Access

Description

4:0

lil_vol

00000

R/W

volume settings for right line input, adjustable in 32 steps @

1.5dB; gain from line input pin (LIN1L) to mixer input

00000

-34.5 dB gain

00001

-33 dB gain

.....

11110

10.5 dB gain

11111

12 dB gain

mute_off_inl

R/W

Control of MUTE switch

left line input is set to mute

normal operation

7:6

n/a

do not change

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