參數(shù)資料
型號: AK4648EC
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/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 14/119頁
文件大?。?/td> 1272K
代理商: AK4648EC
[AK4648]
MS0625-E-01
2007/06
- 14 -
Parameter
Headphone-Amp Characteristics in Pseudo Cap-less mode:
DAC
HPL/HPR pins, ALC=OFF, IVOL=0dB, DVOL=0dB; VBAT bit = “0”; PMHPC bit = “1”; unless otherwise
specified.
Headphone Volume (HPG3-0 bits)
Volume Range
Gain Step: +3dB to –33dB
Output Voltage (Note 22)
HPG = 0dB, 0dBFS, HVDD=3.6V, R
L
=22.8
Ω
HPG = +3dB, 0dBFS, HVDD=4.5V, R
L
=100
Ω
HPG = +3dB, -2dBFS, HVDD=3.6V, R
L
=16
Ω
(Po=40mW)
HPG = +3dB, 0dBFS, HVDD=4.5V, R
L
=16
Ω
(Po=62.5mW)
S/(N+D)
HPG = 0dB,
3dBFS, HVDD=3.6V, R
L
=22.8
Ω
HPG = +3dB,
3dBFS, HVDD=4.5V, R
L
=100
Ω
HPG = +3dB, -2dBFS, HVDD=3.6V, R
L
=16
Ω
(Po=40mW)
HPG = +3dB, 0dBFS, HVDD=4.5V, R
L
=16
Ω
(Po=62.5mW)
(Note 23)
S/N (A-weighted)
(Note 24)
(Note 23)
Interchannel Isolation
(Note 24)
(Note 23)
Interchannel Gain Mismatch
(Note 24)
Load Resistance (Note 25)
C1 in Figure 3
Load Capacitance
C2 in Figure 3
Note 22. Output voltage is proportional to AVDD voltage.
Vout = 0.6 x AVDD(typ.) @ HPG = 0dB, 0.848 x AVDD(typ.) @ HPG = +3dB
Note 23. HPG = 0dB, HVDD=3.6V, R
L
=22.8
Ω
Note 24. HPG = +3dB, HVDD=4.5V, R
L
=100
Ω
Note 25. Load resistance is inserted between HPL pin (HPR pin) and HVCM pin.
min
typ
max
Units
-33
1.5
1.58
2.24
-
-
30
-
-
-
80
-
40
-
-
-
16
-
-
-
3
+3
4.5
2.38
3.36
-
-
-
-
-
-
-
-
-
-
0.8
0.8
-
30
300
dB
dB
Vpp
Vpp
Vrms
Vrms
dBFS
dBFS
dBFS
dBFS
dB
dB
dB
dB
dB
dB
Ω
pF
pF
1.98
2.8
0.8
1.0
50
60
45
40
90
90
50
60
0.1
0.1
-
-
-
HPL/HPR pin
HP-Amp
C1
16
Ω
C2
6.8
Ω
0.22
μ
F
10
Ω
Measurement Point
HVCM pin
C2
VCOM Amp for
HP-Amp
Note: Impedance between headphone and HVCM pin should be as lower as possible. If the impedance is
larger, crosstalk and distortion might be degraded.
Figure 3. Example external output circuit of HP-Amp in Pseudo Cap-less Mode
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