AK4516AVF View Datasheet(PDF) - Asahi Kasei Microdevices
Part Name
Description
MFG CO.
'AK4516AVF' PDF : 39 Pages View PDF
ASAHI KASEI
[AK4516A]
LMAT2-0: Auto Limitter ATT Step
During the auto limitter operation, when either Lch or Rch exceeds the auto limitter detection level set
by LMTH1-0, the number of steps attenuated from current IPGA value is set. For example, when the
current IPGA value is 68H in the state of LMAT2-0="111", it becomes IPGA=60H by the auto limitter
operation, the input signal level is attenuated by 4dB (=0.5dB x 8).
Auto limitter operation period is the constant period by setting LTM1-0 at ZELM="1", it is the different
period by the input signal at ZELM="0". (depend on zero crossing detection period)
When the attenuation value exceeds IPGA="00"(MUTE), it clips to "00".
LMAT2
LMAT1
LMAT0
ATT STEP
0
0
0
1
0
0
1
2
0
1
0
3
0
1
1
4
1
0
0
5
1
0
1
6
1
1
0
7
1
1
1
8
Table 10 . Auto Limitter ATT Step Setting
RESET
These bits are reset by PD pin="L", then inhibits writing to these bits.
Input Analog PGA Control
Addr Register Name
D7
D6
D5
D4
D3
D2
D1
D0
0AH Input PGA Control Lch
LCDET IPGL6 IPGL5 IPGL4 IPGL3 IPGL2 IPGL1 IPGL0
0BH Input PGA Control Rch
LCDET IPGR6 IPGR5 IPGR4 IPGR3 IPGR2 IPGR1 IPGR0
R/W
RD
R/W
RESET
1
30H
LCDET: Auto Limitter and Auto Recovery detection Flag(refer to Figure 7 and Figure 9 )
0: Updating IPGA value by uP writing at the semi-auto mode and the auto limitter or the auto
recovery operation.
1: Complete the auto recovery operation or the auto limitter operation. Complete updating
IPGA value by uP writing at semi-auto mode. (RESET)
This flag(LCDET) always become "1" at manual mode(LMTE=RCVE="1"). The LCDET in
0AH and 0BH shows the same value.
This flag is "0" during initialization after exiting power-down mode by PD pin.
During the semi-auto mode operation, if LMTE is set "0" during the auto limitter operation or
the update of the IPGA value by uP, LCDET becomes "1" after the max "1" ATT/GAIN
operation is completed by internal state.
During the full-auto-mode operation, if LMTE&RCVE are set "0" during the full-auto mode
operation, LCDET becomes "1" after the max "1" ATT/GAIN operation is completed by
internal state.
In case of changing the registers relative to the semi-auto mode and the full-auto mode,
these registers should be changed after writing LMTE="0"(at the semi-auto mode) or
LMTE=RCVE="0" (at the full-auto mode) and then confirming LCDET="1".
M0026-E-00
- 30 -
1998/08
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