[AK4373]
Parameter
min
typ
max
Units
Headphone-Amp Characteristics:
DAC
→
HPL/HPR pins, Pseudo cap-less mode(Figure
7),
HPBTL bit = “0”,
PSEUDO bit = “1” , HPG bit = “0”, HVDD=3.3V, R
L
=22.8Ω, ALC=OFF,
AVOL=0dB, DVOL=0dB; unless otherwise specified.
Output Voltage (Note
0dBFS
-
1.98
-
Vpp
0dBFS (Note
-
0.98
-
Vrms
S/(N+D)
-
38
-
dB
−3dBFS
0dBFS (Note
-
20
-
dB
S/N (A-weighted)
-
86
-
dB
Interchannel Isolation
-
38
-
dB
Interchannel Gain Mismatch
-
0
-
dB
Load Resistance
R
L
= R1 + R2
16
-
-
Ω
Load Capacitance
C1
-
-
30
pF
C2
-
-
300
pF
Note 17. Output voltage is proportional to AVDD voltage.
Vout = 0.6 x AVDD(typ)@HPG bit = “0”, 0.91 x AVDD(typ)@HPG bit = “1”.
Note 18. HPG bit = “1”, HVDD=3.3V, R
L
=16Ω.
HP-Amp
HPL/HPR
pin
R1
C2
Measurement
Point
HVCM pin
R2
C1
VCOM Amp for
HP-Amp
C1
Note: Impedance between headphone and the HVCM pin must be as low as possible. If the impedance is
larger, crosstalk and distortion might be degraded.
Figure 7. HP-Amp Output Circuit in pseudo cap-less mode
MS0991-E-00
- 13 -
2008/09
AKM [ ASAHI KASEI MICROSYSTEMS ]
