參數(shù)資料
型號: AK4648
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 70/119頁
文件大?。?/td> 1272K
代理商: AK4648
[AK4648]
MS0625-E-01
2007/06
- 70 -
When an external resistor R is smaller than 12
Ω
, put an oscillation prevention circuit (0.22
μ
F
±
20% capacitor and
10
Ω±
20% resistor) because it has the possibility that Headphone-Amp oscillates.
The cut-off frequency (fc) of Headphone-Amp depends on the external resistor and capacitor. This fc can be shifted to
lower frequency by using 5-band equalizer function. Table 59 shows the cut off frequency and the output power for
various resistor/capacitor combinations. The headphone impedance R
L
is 16
Ω
. The output voltage of headphone is typ.
(0.6 x AVDD) Vpp @HPG = 0dB.
fc [Hz]
5-band EQ =
OFF
(
+6dB/100Hz @
fs=44.1kHz)
220
45
17
0
100
100
43
100
70
28
6.8
47
149
78
100
50
19
47
106
47
16
10
137
69
Note 59. Output power at 16
Ω
load.
Table 59. External Circuit Example
When the HPMTN bit is “0”, the common voltage of Headphone-Amp falls and the outputs (HPL and HPR pins) go to
“L” (VSS2). When the HPMTN bit is “1”, the common voltage rises to HVDD/2 at VBAT bit = “0”. A capacitor between
the MUTET pin and ground reduces pop noise at power-up. Rise/Fall time constant is in proportional to HVDD voltage
and the capacitor at MUTET pin.
HPMTN bit= “0”
“1”
HVDD
MUTET pin
typ.
3.6V
120ms
4.2V
-
5.0V
-
3.6V
260ms
4.2V
-
5.0V
-
Note 60. Rising time of HP-Amp (0.8 x HVDD/2)
Note 61. Time until the common voltage goes to VSS2.
Table 60. Relationship between capacitor value of MUTET pin and MUTE ON/OFF time (VBAT bit = “0”)
Output Power [mW]@0dBFS
R [
Ω
]
C [
μ
F]
fc [Hz]
5-band EQ = ON
HVDD=3.0V
AVDD=3.0V
HVDD=3.3V
AVDD=3.3V
HVDD=5V
AVDD=3.3V
25.3
30.6
30.6
12.5
15.1
15.1
6.3
7.7
7.7
(Note 60)
HPMTN bit = “1”
“0”
(Note 61)
typ.
140ms
-
-
310ms
-
-
Capacitor value of
max
210ms
230ms
260ms
460ms
500ms
550ms
max.
260ms
270ms
290ms
560ms
570ms
590ms
1
μ
F
±
30%
2.2
μ
F
±
30%
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