ak4640 ETC-unknow, ak4640 Datasheet - Page 69

• Manufacturer Part Number: ak4640
• Description: 16bit Codec With /hp/spk-ampl
• Manufacturer: ETC-unknow

ASAHI KASEI
MS0273-E-00
Headphone-amp Output
<Example>
(Addr:0CH 0DH, D7-0)
PMHPL/R bits
(Addr:05H, D7-5)
ATTL7-0 bits
(Addr:03H, D1-0)
(Addr:01H, D2-1)
(Addr:06H, D3-2)
BST1-0 bits
(Addr:01H, D0)
HPL/R pins
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)
(4) Power up DAC : PMDAC bit = “0” → “1”
(5) Power up headphone-amp : HPL bit = HPR bit = “1” → “0”
(6) Rise up the common voltage of headphone-amp : PMHPL bit = PMHPR bit = “0” → “1”
(7) Fall down the common voltage of headphone-amp : PMHPL bit = PMHPR bit = “1” → “0”
(8) Power down headphone-amp : HPL bit = HPR bit = “0” → “1”
(9) Power down DAC : PMDAC bit = “1” → “0”
(10) Off the low frequency boost level (BST1-0 bits = “00”)
PMDAC bit
FS2-0 bits
HPL/R bit
Output voltage of headphone-amp is still HVSS.
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
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
If the power supply is powered off or Headphone-Amp is powered-down before the common voltage goes to
GND, some click noise occurs. It takes 2times of
At DATTC bit = “1”(default), ATTL7-0 bits of Address 0CH control both Lch and Rch attenuation level.
000
0000000
00
(1)
(2)
(3)
Figure 51. Headphone-Amp Output Sequence
(4)
(5)
(6)
Normal Output
XX
XXX
XXXXXXX
- 69 -
(7)
τ
f
(8)
that the common voltage goes to GND.
(9)
(10)
00
τ
τ
r
f
= 100ms(typ).
= 100ms(typ).
E x a m p le :
X ’t a l a n d P L L a r e u s e d .
S a m p lin g F r e q u e n c y : 4 4 . 1 k H z
D A T T C b it = “ 1 ” ( d e f a u lt )
D ig ita l A tt e n u a t o r L e v e l : - 8 d B
B a s s B o o s t L e v e l : M id d le
D e - e m p h a s e s r e s p o n s e : O F F
S o f t M u t e T im e : 1 0 2 4 / fs
( 1 ) A d d r : 0 5 H , D a ta : 0 0 H
( 2 ) A d d r : 0 6 H , D a ta 1 9 H
( 3 ) A d d r : 0 C H , D a ta 1 0 H
( 4 ) A d d r : 0 1 H , D a ta 6 1 H
( 5 ) A d d r : 0 2 H , D a ta 8 0 H
( 6 ) A d d r : 0 1 H , D a ta 6 7 H
( 7 ) A d d r : 0 1 H , D a ta 6 1 H
( 8 ) A d d r : 0 2 H , D a ta 8 3 H
( 9 ) A d d r : 0 1 H , D a ta 6 0 H
( 1 0 ) A d d r :0 6 H , D a t a 1 1 H
P la y b a c k
[AK4640]
2004/03