AK4213 Datasheet, PDF (12/38 Pages) Asahi Kasei Microsystems – Mono Class-D SPK-Amp with Stereo Cap-less HP-Amp

[AK4213]
OPERATION OVERVIEW
■ Input Selector & Volume
The AK4213 has two input modes that are singled-ended and differential. Single-end and differential modes are selected
by SD3-1 bits. In the differential mode, the input path and volume are controlled via the left channel registers, and the
right channel registers are ignored. The AK4213 has three mixing circuits that used for L/R channels of headphone
amplifier and speaker amplifer. The each mixing circuit can be controlled independently. When all input paths are OFF,
the mixing circuit outputs common voltage. The input volume can control each input path independently. The input
volume ranges from +10 dB to –20dB in 2dB step. When changing the input volume, pop noise may occur. Each input
volume has power management mode which is common to the left and right channels. The power-up/down of input
volume can be controlled by PMV3-1 bits. The power-up time is 16.4ms(typ.) and 26.3ms(max). AC coupling capacitor
of 0.22μF or less should be connected to LINx/RINx (x=1~3) pins to reduce the pop noise at the power-up of the input
volume block.
L1V3-0 bit
R1V3-0 bit
L2V3-0 bit
R2V3-0 bit
GAIN (dB)
Step
L3V3-0 bit
R3V3-0 bit
FH
+10
EH
+8
:
:
CH
+4
BH
+2
AH
9H
0
−2
2dB
8H
−4
:
:
2H
−16
1H
−18
0H
−20
Table 1. Input Volume Setting
(default)
SD3 bit
SD2 bit
Input Mode
SD1 bit
0
Single-ended Mode
1
Differential Mode
Table 2. Input Mode Setting
(default)
MS0949-E-01
- 12 -
2008/07