ak4648 AKM Semiconductor, Inc., ak4648 Datasheet - Page 13

• Manufacturer Part Number: ak4648
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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