AK7746 Datasheet, PDF (10/62 Pages) Asahi Kasei Microsystems – Audio DSP with 5-channel 24-bit ADC and Input Mux

[ASAHI KASEI]
[AK7746]
7. Electric Characteristics
(1) Analog characteristics
(Unless otherwise specified, Ta = 25°C; AVDD, DVDD = 3.3V; VREFH = AVDD, VREFL = AVSS;
BITCLK = 64 fs; Signal frequency 1 kHz;
Measurement bandwidth = 20 Hz to 20 kHz @48 kHz, 20 Hz to 40 kHz @96kHz;
ADC with all differential inputs, CLKO output = 18.432MHz; XTI = 18.432MHz, SMODE = “H”)
Parameter
min
typ
max
Resolution
24
Dynamic characteristics
S/(N+D)
fs = 48kHz (-1dBFS)
(Note1)
81
91
fs = 96kHz (-1dBFS)
88
Stereo ^{Dynamic range fs = 48kHz (A filter)}
(Note 1,2)
88
98
ADC
fs = 96kHz
94
Section S/N
fs = 48kHz ( A filter )
88
98
fs = 98kHz
94
ADC1
ADC2
Inter-channel isolation (f=1kHz)
DC accuracy
(Note 3)
90
115
Inter-channel gain mismatching
0.1
0.3
Analog input
Input voltage ( differential inputs)
(Note 4)
±1.85
±2.00
±2.15
Input voltage ( single ended)
(Note 5)
1.85
2.00
2.15
Input impedance
(fs=48kHz) (Note 6)
22
33
Monaural Resolution
24
ADC Dynamic characteristics
Section _S/(N+D)
fs = 48kHz (-1dBFS)
76
91
fs = 96kHz (-1dBFS)
88
ADCM _{Dynamic range fs = 48kHz (A filter)}
(Note2)
80
97
fs = 96kHz
93
S/N
fs = 48kHz ( A filter )
fs = 98kHz
80
97
93
Analog input
Input voltage
(Note 7)
1.85
2.00
2.15
Input impedance
(Note 8)
22
33
Note 1) This value is not guaranteed with single-ended input operation
Note 2) Indicates S/(N+D) when -60 dBFS signal is applied
Note 3) Specified for L-ch and R-ch of each input selector with a -1dBFS signal
Note 4) This applies to AINL+, AINL-, AINR+ and AINR-.
Full-scale range (∆AIN = (AIN+) - (AIN-)) is represented by (±FS = ± (VREFH-VREFL) × (2.0/3.3)).
Note 5) This applies to AINL2~L8 and AINR2~R8.
The full-scale of single-snded input is (FS=(VREFH-VREFL) × (2.0/3.3)).
Note 6) This applies to AINL+, AINL-, AINR+, AINR-, AINL2~L8 and AINR2~R8.
Note 7) This applies to AINM.
Full-scale range is represented by (FS = ±(VREFH-VREFL) × (2.0/3.3)).
Note 8)) This applies to AINM.
Unit
Bits
dB
dB
dBFS
dBFS
dBFS
dBFS
dB
dB
Vp-p
Vp-p
kΩ
Bits
dB
dB
dBFS
dBFS
dBFS
dBFS
Vp-p
kΩ
[MS0369-E00]
- 10 -
2004/12