參數(shù)資料
型號(hào)： AK4368EG
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： DAC with built-in PLL & HP-AMP
中文描述： DAC，帶有內(nèi)置的鎖相環(huán)
文件頁(yè)數(shù)： 31/60頁(yè)
文件大小： 817K
代理商： AK4368EG
ASAHI KASEI
[AK4368EG]
MS0529-E-00
2006/07
- 31 -
The cut-off frequency of the headphone-amp output depends on the external resistor and capacitor used. Table 23 shows
the cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance R
L
is
16
. Output powers are shown at AVDD = 2.4, 3.0 and 3.3V. The output voltage of the headphone is 0.47 x AVDD
(Vpp) @
3dBFS.
AK4368
HP-AMP
16
Headphone
R
C
Figure 22. External Circuit Example of Headphone
Output Power [mW]
HPG=0, 0dB
HPG=1,
4.8dB
3.3V
R [
]
C [
μ
F]
fc [Hz]
BOOST=OFF
fc [Hz]
BOOST=MIN
2.4V
3.0V
3.3V
220
100
100
47
100
47
45
100
70
149
50
106
17
43
28
78
19
47
0
20
31
38
50
6.8
10
15
18
25
16
5
8
9
13
Table 23. Relationship of external circuit, output power and frequency response
DACHL, LINHL, MINHL, DACHR, RINHR and MINHR bits set the path, respectively. When the HPG bit is “0”(R
1
=
100k), the gain is +0.76dB(typ) for all paths. When HPG bit is “1”(R
1
= 50k), the DAC path gain is +6.76dB(typ).
100k(typ)
100k(typ)
+
HPL/HPR pin
LIN/RIN pin
MIN pin
HP-Amp
1.09R
2
100k(typ)
LINHL/RINHR bit
MINHL/MINHR bit
DACHL/DACHR bit
+
R
2
DACL/DACR
R
1
Figure 23. Summation circuit for headphone amp output (HPG bit = “0”)
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