[AK4648]
Units
min
typ
max
Parameter
Headphone-Amp Characteristics in Single-ended mode:
DAC → HPL/HPR pins, ALC=OFF, IVOL=0dB, DVOL=0dB; VBAT bit = “0”; PMHPC bit = “0”; unless otherwise
specified.
Headphone Volume (HPG3-0 bits)
Volume Range
Gain Step: +3dB to –33dB
-33
1.5
-
3
+3
4.5
dB
dB
Output Voltage (Note 19)
1.58
2.24
-
-
1.98
2.8
0.8
2.38
3.36
-
-
Vpp
Vpp
Vrms
Vrms
HPG = 0dB, 0dBFS, HVDD=3.6V, RL=22.8Ω
HPG = +3dB, 0dBFS, HVDD=4.5V, RL=100Ω
HPG = +3dB, -2dBFS, HVDD=3.6V, RL=16Ω (Po=40mW)
HPG = +3dB, 0dBFS, HVDD=4.5V, RL=16Ω (Po=62.5mW)
S/(N+D)
1.0
60
-
-
-
80
-
65
-
-
-
16
-
70
75
60
60
90
90
75
80
0.1
0.1
-
-
-
-
-
-
-
-
-
dBFS
dBFS
dBFS
dBFS
dB
dB
dB
dB
dB
dB
Ω
pF
pF
HPG = 0dB, −3dBFS, HVDD=3.6V, RL=22.8Ω
HPG = +3dB, −3dBFS, HVDD=4.5V, RL=100Ω
HPG = +3dB, -2dBFS, HVDD=3.6V, RL=16Ω (Po=40mW)
HPG = +3dB, 0dBFS, HVDD=4.5V, RL=16Ω (Po=62.5mW)
(Note 20)
S/N (A-weighted)
(Note 21)
(Note 20)
(Note 21)
Interchannel Isolation
(Note 20)
Interchannel Gain Mismatch
(Note 21)
Load Resistance
0.8
0.8
-
30
300
C1 in Figure 2
C2 in Figure 2
-
-
Load Capacitance
-
Note 19. Output voltage is proportional to AVDD voltage.
Vout = 0.6 x AVDD(typ.) @ HPG = 0dB, 0.848 x AVDD(typ.) @ HPG = +3dB
Note 20. HPG = 0dB, HVDD=3.6V, RL=22.8Ω.
Note 21. HPG = +3dB, HVDD=4.5V, RL=100Ω.
HP-Amp
HPL/HPR pin
C1
Measurement Point
47μF
6.8Ω
16Ω
0.22μF
C2
10Ω
Figure 2. Example external output circuit of HP-Amp in Single-ended mode
MS0625-E-01
2007/06
- 13 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
