AK4534 Datasheet, PDF (59/64 Pages) Asahi Kasei Microsystems – 16Bit CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4534]
n Headphone-amp Output
FS2-0 bits
(Addr:05H, D7-5)
BST1-0 bits
(Addr:06H, D3-2)
ATTL7-0 bits
(Addr:0CH 0DH, D7-0)
PMDAC bit
(Addr:01H, D0)
PMHPL/R bits
(Addr:01H, D2-1)
HPL/R pins
External Mute
000
(1)
00
(2)
0000000
(3)
XXX
XX
XXXXXXX
00
(8)
E xam p le :
X ’tal a n d P L L a r e u s e d .
Sampling Frequency : 44.1kH z
D A T T C b it = “1 ”(default)
D igital A ttenuato r Level : -8dB
B a s s B o o s t Level : M iddle
D e-emphases response : OFF
S o ft M ute Tim e : 1024/fs
(1) Addr:05H, Data:00H
(2) Addr:06H, Data 19H
(3 ) A d d r:0C H , Data 10H
(4) Addr:01H, Data 67H
(4)
(7)
(5) R e lease external M u te
P la y b a c k
Normal Output
(5)
(6)
(6) E n a b le external M u te
(7) Addr:01H, Data 60H
(8) Addr:06H, Data 11H
Figure 39. Headphone-Amp Output Sequence
<Example>
At first, clocks should be supplied according to “Clock Set Up” sequence.
(1) Set up a sampling frequency (FS2-0 bits) if PLL mode is used.
(2) Set up the low frequency boost level(BST1-0 bits)
(3) Set up the digital volume(Addr : 0CH and 0DH)
At DATTC bit = “1”(default), ATTL7-0 bits of Address 0CH control both Lch and Rch attenuation level.
(4) Power up DAC and headphone-amp : PMDAC bit = PMHPL bit = PMHPR bit = “0” → “1”
The rising time after power up Headphone-amp depends on the capacitor value connected with the MUTET
pin. When this capacitor value is 1.0µF, the time constant is τr = 100ms.
(5) Release the external mute.
(6) Enable the external mute.
(7) Power down DAC and headphone-amp : PMDAC bit = PMHPL bit = PMHPR bit = “1” → “0”
The falling time of Headphone-amp depends on the capacitor for the AC couple of Headphone-amp output.
When this capacitor value is 47µF, the time constant is τf = 188ms. If the power supply is powered off or
Headphone-Amp is powered-up again before the common voltage goes to GND, some POP noise occurs. It
takes 5times of τf that the common voltage goes to GND.
(8) Off the low frequency boost level (BST1-0 bits = “00”)
MS0133-E-03
- 59 -
2003/5