AK7758VN Datasheet, PDF (21/32 Pages) Asahi Kasei Microsystems – DSP with Stereo CODEC + Mic/Lineout Amp

[AK7758]
8.4. Digital Filter Characteristics
8.4.1. ADC
(Ta= -40~85°C; AVDD＝LVDD=3.0~3.6V, TVDD1/2=1.7~3.6V, DVDD=1.14~1.3V, AVSS=DVSS=0V,
fs=48kHz (Note 37))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Passband +0.14dB ~ 0.12dB
(Note 38)
-0.87dB
PB
0
20.7
kHz
21.6
kHz
-3.0dB
22.8
kHz
Stopband
(Note 39)
SB
28.4
kHz
Passband Ripple (Note 38)
PR
±0.14
dB
Stopband Ripple (Note 39, Note 40)
SA
65
dB
Group Delay Distorsion
△GD
0
μs
Group Daley
(Ts=1/fs)
GD
12.5
Ts
Note 37. The passband and stopband frequencies scale with “fs” (system sampling rate). The
characteristic of the high pass filter is not included.
Note 38. The passband is from DC to 18.9kHz when fs=48kHz.
Note 39. The stopband is 28kHz to 3.044MHz when fs=48kHz.
Note 40. When fs = 48kHz, the analog modulator samples the input signal at 3.072MHz. There is no
attenuation of an input signal in band (n x 3.072MHz ±21.99kHz; n=0, 1, 2, 3…) of integer times
of the sampling frequency by the digital filter.
8.4.2. DAC
(Ta=-40~85°C; AVDD＝LVDD=3.0~3.6V, TVDD1/2=1.7~3.6V, DVDD=1.14~1.3V, AVSS=DVSS=0V,
fs=48kHz)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Passband (Note 41) (±0.05dB)
PB
0
21.7
kHz
(-6.0dB)
24
kHz
Stopband (Note 41)
SB
26.2
kHz
Passband Ripple
PR
±0.05
dB
Stopband Ripple
SA
64
dB
Group Daley (Ts=1/fs) (Note 42)
GD
24
Ts
Digital Filter + Analog Filter
Amplitude Characteristics 20Hz~20.0kHz
±0.5
dB
Note 41. The passband and stopband frequencies are proportional to “fs” (system sampling rate), and
represents PB=0.4535 × fs(@0.05dB) and SB=0.5465 × fs, respectively.
Note 42. The digital filter delay is calculated as the time from setting data into the input register until an
analog signal is output.
016003563-E-02-PB
- 21 -
2016/09