AK4648 Datasheet, PDF (13/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

[AK4648]
Parameter
min
typ
max
Units
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
-33
-
+3
dB
Gain Step: +3dB to –33dB
1.5
3
4.5
dB
Output Voltage (Note 19)
HPG = 0dB, 0dBFS, HVDD=3.6V, R_L=22.8Ω
1.58
1.98
2.38
Vpp
HPG = +3dB, 0dBFS, HVDD=4.5V, R_L=100Ω
2.24
2.8
3.36
Vpp
HPG = +3dB, -2dBFS, HVDD=3.6V, R_L=16Ω (Po=40mW)
-
0.8
-
Vrms
HPG = +3dB, 0dBFS, HVDD=4.5V, R_L=16Ω (Po=62.5mW)
-
1.0
-
Vrms
S/(N+D)
HPG = 0dB, −3dBFS, HVDD=3.6V, R_L=22.8Ω
60
70
HPG = +3dB, −3dBFS, HVDD=4.5V, R_L=100Ω
-
75
HPG = +3dB, -2dBFS, HVDD=3.6V, R_L=16Ω (Po=40mW)
-
60
HPG = +3dB, 0dBFS, HVDD=4.5V, R_L=16Ω (Po=62.5mW)
-
60
S/N (A-weighted)
(Note 20)
(Note 21)
80
90
-
90
-
dBFS
-
dBFS
-
dBFS
-
dBFS
-
dB
-
dB
Interchannel Isolation
(Note 20)
(Note 21)
65
75
-
80
-
dB
-
dB
Interchannel Gain Mismatch
(Note 20)
(Note 21)
-
0.1
0.8
dB
-
0.1
0.8
dB
Load Resistance
16
-
-
Ω
Load Capacitance
C1 in Figure 2
-
C2 in Figure 2
-
-
30
pF
-
300
pF
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, R_L=22.8Ω.
Note 21. HPG = +3dB, HVDD=4.5V, R_L=100Ω.
HP-Amp
HPL/HPR pin
Measurement Point
47μF
6.8Ω
C1 0.22μF
10Ω
C2 ^16Ω
Figure 2. Example external output circuit of HP-Amp in Single-ended mode
MS0625-E-01
- 13 -
2007/06