AK7756 Datasheet, PDF (10/27 Pages) Asahi Kasei Microsystems – DSP with Mono CODEC + Mic/Lineout Amp

[AK7756]
ANALOG CHARACTERISTICS (CODEC)
■ ADC Characteristics
(Ta=25ºC; AVDD=DVDD=3.3V, DVDD18=1.8V; VSS1=VSS2=0V; BICK=64fs; Signal Frequency 1kHz;
Measurement frequency =20Hz~8 kHz, fs=16 kHz, CKM mode 6, unless otherwise specified.)
Parameter
min
typ
max
MIC Input Programmable Gain Amplifier
Input Resistance (INP, INN pins)
(MGAIN = 0dB)
22.5
30
37.5
Gain
Min (MGAIN2-0 bit = “0H”)
-
0
-
Max (MGAIN2-0 bit = “7H”)
-
+33
-
Step size (MGAIN2-0bit = “1H” ~ “7H”)
3
Microphone Bias Supply: MICBIAS pin
Bias Output Voltage (Note 10)
2.32
Load Resistance
2.0
-
-
Load Capacitance
-
-
30
Mono
Resolution
24
ADC
Dynamic Characteristics
AIN pin→ Mono ADC→ SDOUT1
S/(N+D) (-1dBFS)
MGAIN=21dB
72
MGAIN= 0dB
69
77
Dynamic Range
MGAIN=21dB
77
MGAIN= 0dB
78
86
S/N
MGAIN=21dB
77
MGAIN= 0dB
78
86
Microphone Analog Inputs INP,INN (Note 11)
Units
kΩ
dB
dB
dB
V
kΩ
pF
Bits
dB
dB
dB
Full-scale Input ^{Differential MGAIN= 0dB}
±2.0
±2.2
Voltage
Single-ended MGAIN= 0dB
2.0
2.2
±2.4
Vpp
2.4
VPP
Note 10. The output voltage is proportional to AVDD. Vmic bias=0.70 * AVDD, Iout=1mA
Note 11. The input voltage is proportional to AVDD. Vin=0.67 x AVDD (typ.) @MGAIN = 0dB
MS1218-E-00-PB
10
2010/08