AK7770EQ Datasheet, PDF (11/22 Pages) Asahi Kasei Microsystems – Audio DSP with Multi-Channel Audio CODEC

[AK7770]
■ DAC3 + HP Amp
(Ta=25°C; AVDD=HVDD=DVDD=3.3V; DVDD18=1.8V; VSS1=VSS2=VSS3=0V;
Signal frequency = 1kHz; Measurement bandwidth =20Hz~20kHz , fs=48kHz fs; SRC reset; fs=48kHzs)
Parameter
min
typ
max
Units
Analog Volume Control Characteristics OPGA):
Gain
Maximum (OPGA[4:0] bits= “1FH”)
-
+0
-
dB
Minimum (OPGA[4:0] bits= “01H”)
-
-50
-
dB
Step size
+0dB ∼ -16dB
0.1
1
-16dB ∼ -38dB
0.1
2
-38dB ∼ -50dB
-
4
Headphone-Amp Characteristics: DAC → HPL/HPR pins, RL=16Ω
-
dB
-
dB
-
dB
Output Voltage
1.53
1.7
1.87
Vpp
S/(N+D)
(−3dBFS)
63
73
-
dB
S/N
(A-weighted)
80
86
-
dB
Inter channel Isolation
60
80
-
dB
Inter channel Gain Mismatch
-
0.1
0.5
dB
Load Resistance
(RL, Figure 3)
16
-
-
Ω
Load Capacitance
(C1, Figure 3)
-
-
30
pF
Load Capacitance
(C2, Figure 3)
-
-
300
pF
HP-Amp
−
HPL pin
HPR pin
Measurement
Point
47μF
+
+
C1
0.22μF C2
RL
10Ω
Figure 3. Headphone amplifier output circuit
MS0699-E-01-PB
- 11 -
2008/06