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AK4958ECB Datasheet, PDF (17/35 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/VIDEO-AMP & LDO | |||
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[AK4958]
Parameter
min
typ
max
Unit
Video Signal Input
External Resistor (Note 20) R1 (Figure 3)
External Capacitor
C1 (Figure 3)
Maximum Input Voltage VG1-0 bits = â10â(+12dB)
Pull Down Current
0.075
0.02
-
-
-
0.047
0.6
0.125
1.6
kï
0.2
ïF
-
Vpp
-
ïA
Video Analog Output (Figure 4)
Output Gain
fin =100kHz
Sine wave Input (Note 19)
VG0 bit = â0â, 0.5Vpp Input
VG0 bit = â1â, 0.3Vpp Input
11.5
12.0
12.5
dB
16.0
16.5
17.0
Clamp Level (Note 19)
-
50
100
mV
S/N (Note 21)
VG1-0 bits = â10â(+12dB)
BW = 100kH ï¾ 6MHz,
S = 0.35Vpp Input
60
67
-
dB
Maximum Output Voltage
(Note 19)
fin =100kHz (Sine wave)
2.54
-
-
Vpp
Secondary Harmonic Distortion 430mVpp: ï20 ~ 100IRE,
VG1-0 bits = â10â(+12dB)
fin = 3.58MHz
Sine Wave Input
(Flat Field = 100 IRE
-
ï45
ï35
dB
Burst = ï20IRE)
Load Resistance
140
150
-
ï
Load Capacitance
C2 (Figure 4)
-
-
15
pF
C3 (Figure 4)
-
-
400
pF
PSRR (Note 22)
fin = 10kHz
-
45
-
dB
VG1-0 bits = â10â(+12dB)
fin = 100kHz
-
30
-
dB
LPF for VIN signal : (Note 19)
Frequency Response (fin = 100kHz,0.5Vpp, Sine wave Input) , C2 = 15pF, C3 = 400pF
Response at 6.75MHz
Response at 27MHz
ï3.0
-
ï0.5
ï47
+2.0
dB
ï20
Group Delay
|GD3MHzïGD6MHz|
-
15
100
ns
Note 19. Figure 4. ã®Mesurement point 1 ã®æ¸¬å®ç¹ã§ã®ã¹ããã¯ã§ãã0.5Vppå
¥åã¯VG1-0 bits = â10â(+12dB)æ
ã® å¤ ã§ ã ã å
¥ å æ¯ å¹
㯠㲠㤠㳠㫠å æ¯ ä¾ ã ã¾ ã ã S/N, Secondary Harmonic Distortion 㮠測 å® ç¹ã¯
Measurement point 2ã«ãªãã¾ãã
Note 20. VIN pin ã¸ã®å
¥ååè·¯ããã¯ã¼ãã¦ã³ããå
¥åä¿¡å·ãåæ¢ããæãªã©ã«ã0.075 ~ 1.6kïã®ç¯å²å¤ã«ãª
ãå ´åãPMV bit ãâ0âã«ãã¦ä¸ããã
Note 21. S/N = 20 log (Output Voltage [Vpp]/Noise Level [Vrms]). Output Voltage = 0.7 [Vpp].
Note 22.測å®æ¡ä»¶ã¯ãAVDD ã« 500mVpp ã®Sinæ³¢ãå°å ããVOUT ã«ã¦ï20IRE, 0IRE, 100IRE ã«ãªãDC ã VIN
ã«å°å ããå ´åã§ãã
From Video DAC
VIN pin
R1
C1
AK4958
Figure 3. External Resistor of Video Signal Input pin
Measurement point1 Measurement point 2
Video Signal Output
C2
75 Ω
R2
C3
R3
75 Ω
Figure 4. Load Capacitance C2 and C3
MS1558-J-01-PB
- 17 -
2013/10
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