AK7712A-VT Datasheet, PDF (14/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
[AK7712A-VT]
Digital Filter Characteristics
This data is not the guaranteed characteristic value but the designed value as a reference.
ADC unit :
(Ta=25°C; VA,VD,VB=5.0V±5%; fs=44.1kHz)
Parameter
Symbol
min
typ
max
Units
Passband (±0.06dB)
PB
0
20.00
kHz
( -6.0 dB) (note 1)
0
22.05
kHz
Stopband
(note 1)
SB
24.35
kHz
Passband ripple
(note 2)
PR
±0.005
dB
Stopband attenuation
(note 3,4)
SR
80
dB
Group delay distortion
∆GD
0
us
Group delay
(Ts=1/fs)
GD
29.3
Ts
note 1: The frequencies of passband/stopband are proportional to the sampling frequency (fs).
2: Passband is DC to 19.75kHz at fs=44.1kHz.
3: Stopband is 27.56kHz to 2.795MHz at fs=44.1kHz.
4: The analog modulator samples the input at 2.8224MHz for fs=44.1kHz. There is no rejection of
input signals at those band width which are multiples of the sampling frequency(n x 2.8224MHz
±20.21kHz; n=0,1,2,3^…).
DAC unit :
(Ta=25°C; VA,VD,VB=5.0V±5%; fs=44.1kHz;)
Parameter
Symbol
min
typ
max
Digital filter
Passband
( -0.2 dB) (note 1)
PB
0
20.0
( -6.0 dB)
-
22.05
-
Stopband
(note 1)
SB
24.3
Passband ripple
PR
±0.05
Stopband attenuation
SA
41
Group delay
(Ts = 1/fs) (note 2)
GD
-
14.7
-
Digital filter + analog filter
Amplitude characteristics
0∼20kHz
-
±0.5
-
note 1: The frequencies of passband/stopband are proportional to the sampling frequency (fs);
PB=0.4535fs(@-0.2dB), SB=0.546fs(@-41dB).
2: The calculating delay time is occurred by digital filtering. This is the time from the setting
20-bit data on input register to the output of analog signal. (at fs=44.1kHz)
Units
kHz
kHz
kHz
dB
dB
Ts
dB
0180-E-02
- 14 -
1997/12