AK7755EN_16 Datasheet, PDF (12/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
8. Electrical Characteristics
■ Analog Characteristics
1. MIC Amplifier Gain
(Ta= 25C; AVDD=TVDD=3.3V; DVDD=1.2V; AVSS=DVSS=0V)
Parameter
min
typ
MIC Input Impedance
14
20
AMP
MGNL[3:0]bits=0h, MGNR[3:0]bits=0h
0
MGNL[3:0]bits=1h, MGNR[3:0]bits=1h
2
MGNL[3:0]bits=2h, MGNR[3:0]bits=2h
4
MGNL[3:0]bits=3h, MGNR[3:0]bits=3h
6
MGNL[3:0]bits=4h, MGNR[3:0]bits=4h
8
MGNL[3:0]bits=5h, MGNR[3:0]bits=5h
10
MGNL[3:0]bits=6h, MGNR[3:0]bits=6h
12
Gain
MGNL[3:0]bits=7h, MGNR[3:0]bits=7h
MGNL[3:0]bits=8h, MGNR[3:0]bits=8h
14
16
MGNL[3:0]bits=9h, MGNR[3:0]bits=9h
18
MGNL[3:0]bits=Ah, MGNR[3:0]bits=Ah
21
MGNL[3:0]bits=Bh, MGNR[3:0]bits=Bh
24
MGNL[3:0]bits=Ch, MGNR[3:0]bits=Ch
27
MGNL[3:0]bits=Dh, MGNR[3:0]bits=Dh
30
MGNL[3:0]bits=Eh, MGNR[3:0]bits=Eh
33
MGNL[3:0]bits=Fh, MGNR[3:0]bits=Fh
36
max
Unit
kΩ
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
2. Line-in Amplifier Gain
(Ta= 25C; AVDD=TVDD=3.3V; DVDD=1.2V; AVSS=DVSS=0V)
Parameter
min
typ
max
Unit
Line-in Input Impedance
14
20
kΩ
AMP
LIGN[3:0]bits=0h
0
dB
LIGN[3:0]bits=1h
-3
dB
LIGN[3:0]bits=2h
-6
dB
LIGN[3:0]bits=3h
-9
dB
LIGN[3:0]bits=4h
-12
dB
LIGN[3:0]bits=5h
-15
dB
LIGN[3:0]bits=6h
-18
dB
Gain
LIGN[3:0]bits=7h
-21
dB
(Note 7) LIGN[3:0]bits=8h
N/A
dB
LIGN[3:0]bits=9h
+3
dB
LIGN[3:0]bits=Ah
+6
dB
LIGN[3:0]bits=Bh
+9
dB
LIGN[3:0]bits=Ch
+12
dB
LIGN[3:0]bits=Dh
+15
dB
LIGN[3:0]bits=Eh
+18
dB
LIGN[3:0]bits=Fh
+21
dB
Note 7. If the output signal of line-in amplifier is input to the analog mixer, +18dB gain is added to the
signal at the mixer.
014006643-E-00
- 12 -
2014/10