AK4955 Datasheet, PDF (8/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
ANALOG CHARACTERISTICS
(Ta=25°C; AVDD=LVDD=SVDD=3.3V, DVDD=TVDD= 1.8V; VSS1=VSS2=VSS3= 0V; fs=48kHz, BICK=64fs;
Signal Frequency=1kHz; 24bit Data; Measurement Bandwidth=20Hz ∼ 20kHz; unless otherwise specified)
Parameter
min
typ
max
Unit
MIC Amplifier: LIN1, RIN1, LIN2, RIN2 pins
Input Resistance
23
33
43
kΩ
MGAIN3-0 bits = “0000”
Gain
MGAIN3-0 bits = “0001”
-1
0
+1
dB
+4
+5
+6
dB
MGAIN3-0 bits = “0010”
+7
+8
+9
dB
MGAIN3-0 bits = “0011”
+10
+11
+12
dB
MGAIN3-0 bits = “0100”
+13
+14
+15
dB
MGAIN3-0 bits = “0101”
+15
+16
+17
dB
MGAIN3-0 bits = “0110”
+17
+18
+19
dB
MGAIN3-0 bits = “0111”
+20
+21
+22
dB
MGAIN3-0 bits = “1000”
+23
+24
+25
dB
MIC Power Supply: MPWR pin
Output Voltage
MICL bit = “0”
2.3
2.5
2.7
V
MICL bit = “1”
2.0
2.2
2.4
V
Output Noise Level (A-weighted)
-
−108
-
dBV
Load Resistance
0.5
-
-
kΩ
Load Capacitance
-
-
30
pF
PSRR (fin = 1kHz)
-
100
-
dB
ADC Analog Input Characteristics
: LIN1/RIN1/LIN2/RIN2 pins → ADC (Programmable Filter = DSP=OFF)
Resolution
-
-
24
Bits
Input Voltage (Note 11)
(Note 12)
-
(Note 13)
1.86
0.261
2.07
-
Vpp
2.28
Vpp
S/(N+D) (−1dBFS)
(Note 12)
71
81
(Note 13)
-
82
-
dBFS
-
dBFS
D-Range (−60dBFS, A-weighted)
(Note 12)
(Note 13)
78
-
88
96
-
dB
-
dB
S/N
(A-weighted)
(Note 12)
78
(Note 13)
-
88
96
-
dB
-
dB
Interchannel Isolation
(Note 12)
75
90
(Note 13)
-
100
-
dB
-
dB
Interchannel Gain Mismatch
(Note 12)
-
(Note 13)
-
0
0.5
dB
0
0.5
dB
Note 10. MICL bit must be set to “1” when AVDD=2.7 ~ 3.6V, and it must be set to “0” when AVDD=2.9 ~ 3.6V.
Note 11. Vin = 0.9 x 2.3Vpp (typ) @MGAIN3-0 bits = “0000” (0dB)
Note 12. MGAIN3-0 bits = “0110” (+18dB)
Note 13. MGAIN3-0 bits = “0000” (0dB)
MS1343-E-00
-8-
2011/12