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AK4958ECB Datasheet, PDF (19/35 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/VIDEO-AMP & LDO | |||
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[AK4958]
ãã£ã«ã¿ç¹æ§
(Ta =25ï°C; fs=48kHz ; AK4958EG: AVDD=2.8 ï¾ 3.6V, DVDD = 1.6 ~ 2.0V, TVDD = 1.6 or (DVDD-0.2)ï¾ 3.6V,
AK4958ECB: AVDD=2.8 ï¾ 3.6V, DTVDD = 1.6 ~ 2.0V)
Parameter
Symbol
min
typ
max
Unit
ADC Digital Filter (Decimation LPF):
Passband (Note 29)
ï±0.16dB
PB
0
-
18.8
kHz
ï0.66dB
-
21.1
-
kHz
ï1.1dB
-
21.7
-
kHz
ï6.9dB
-
24.1
-
kHz
Stopband (Note 29)
SB
28.4
-
-
kHz
Passband Ripple
PR
-
-
ï±0.16
dB
Stopband Attenuation
SA
73
-
-
dB
Group Delay (Note 30)
GD
-
17
-
1/fs
Group Delay Distortion
ïGD
-
0
-
ïs
ADC Digital Filter (HPF): HPFC1-0 bits = â00â
Frequency Response (Note 29) ï3.0dB
FR
ï0.5dB
ï0.1dB
-
3.7
-
Hz
-
10.9
-
Hz
-
23.9
-
Hz
DAC Digital Filter (LPF):
Passband (Note 29)
ï±0.05dB
PB
0
ï6.0dB
-
Stopband (Note 29)
SB
26.2
Passband Ripple
PR
-
Stopband Attenuation
SA
54
Group Delay (Note 30)
GD
-
-
21.8
kHz
24
-
kHz
-
-
kHz
-
ï±0.05
dB
-
-
dB
22
-
1/fs
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0 ï¾ 20.0kHz
FR
-
ï±1.0
-
dB
Note 29. åæ¯å¹
ç¹æ§ã®å¨æ³¢æ°ã¯ fs (ãµã³ããªã³ã°å¨æ³¢æ°)ã«æ¯ä¾ãã¾ãã
ä¾ãã°ãPB=21.7kHz (@ï1.1dB)ã¯0.454 x fsã§ã(ADC)ãåå¿çã¯1kHzãåºæºã«ãã¾ãã
Note 30. ãã£ã¸ã¿ã«ãã£ã«ã¿ã«ããé
延æ¼ç®ã§ãADCé¨ã¯ã¢ããã°ä¿¡å·ãå
¥åããã¦ãã両ãã£ãã«ã®24ã
ãããã¼ã¿ãåºåã¬ã¸ã¹ã¿ã«ã»ãããããã¾ã§ã®æéã§ããDACé¨ã¯24ããããã¼ã¿ãå
¥åã¬ã¸ã¹
ã¿ã«ã»ããããã¦ããã¢ããã°ä¿¡å·ãåºåãããã¾ã§ã®æéã§ããããã°ã©ããã«ãã£ã«ã¿ (1次
HPF + 1次LPF + 4-Band Equalizer + ALC + 1-Band Equalizer) ãééãããã¹ãé¸æããå ´åã® Group
Delay ã¯IIR ãã£ã«ã¿ã«ããä½ç¸å¤åãç¡ãå ´åã§ä¸è¨è¨è¼ã®å¤ã«å¯¾ãã¦ãé²é³ã¢ã¼ãã®ã¨ã4fs, å
çã¢ã¼ãã®ã¨ã4fså¢å ãã¾ãã
MS1558-J-01-PB
- 19 -
2013/10
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