AK7754 Datasheet, PDF (12/26 Pages) Asahi Kasei Microsystems – Audio DSP with Stereo CODEC + MIC/HP-AMP

[AK7754]
ANALOG CHARACTERISTICS (HP-Amp)
(Ta=25ºC; AVDD=HVDD=DVDD=3.3V; DVDD18=1.8V; VSS1=VSS2=VSS3=VSS4=0V; Signal frequency 1kHz;
Measurement frequency=20Hz~20kHz@48kHz; PMSRC bit=“0”), R_L =16Ω; Circuit External Capacitance:
C1=C2=OPEN. CKM mode6, Unless otherwise specified.)
Parameter
min
typ
max
Unit
Analog Volume Characteristics
Gain
Max (HPGL,HPGR[4:0] bits= “1FH”)
-
+0
-
dB
Min (HPGL,HPGR[4:0] bits= “01H”)
-
-50
-
dB
Step width
+0dB ∼ -16dB
0.1
1
-
dB
-16dB ∼ -38dB
0.1
2
-
dB
-38dB ∼ -50dB
-
4
-
dB
Headphone-Amp Characteristics: DAC → HPL/HPR pins, RL=16Ω (Note 16)
Output Voltage
1.68
1.87
2.06
Vpp
S/(N+D)
(-3dBFS)
60
70
-
dB
S/N
(A-weighted)
83
89
-
dB
Inter channel Isolation
60
75
-
dB
Inter channel Gain Mismatch
-
0.0
1.0
dB
Load Resistance
(RL, Figure 2)
16
-
-
Ω
Load Capacitance
(C1, Figure 2)
-
-
30
pF
Load Capacitance
(C2, Figure 2)
-
-
300
pF
Note 16. Because of an asynchronous circuit operation, the characteristic may deteriorate when SRC is in operation.
HP-Amp
–
HPL pin
HPR pin
Measurement
Point
47μF
+
+
C1
0.22μF C2
RL
10Ω
Figure 2. Headphone Amp Output Circuit
MS1138-E-01-PB
12
2012/03