AK4950 Datasheet, PDF (10/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
Parameter
min
typ
max
Unit
Video Signal Input
External Resistor (Note 16) R1 (Figure 2)
External Capacitor
C1 (Figure 2)
Maximum Input Voltage: VG1-0 bits = “00” (+6dB)
Pull Down Current
-
-
600
Ω
0.05
0.1
0.2
μF
-
1.0
1.24
Vpp
-
0.4
-
μA
Video Analog Output (Figure 3)
Output Gain
VG1-0 bits = “00”, 1.0Vpp Input
fin=100kHz
Sine wave Input
(Note 15)
VG1-0 bits = “01”, 0.7Vpp Input
VG1-0 bits = “10”, 0.5Vpp Input
VG1-0 bits = “11”,0.3Vpp Input
DC Output Offset Level
(Note 15)
Signal Input
(Pedestal Level)
No Signal Input
S/N(Note 17)
VG1-0 bits = “00”(+6dB)
BW = 100kH ∼ 6MHz,
S = 0.7Vpp Input
5.5
8.5
11.5
16
−100
-
58
6.0
9.0
12.0
16.5
0
−572
70
6.5
9.5
dB
12.5
17
100
mV
-
mV
-
dB
Maximum Output Voltage
(Note 15)
fin = 100kHz (Sine wave)
Secondary Harmonic Distortion
VG1-0 bits = “00”(+6dB), f = 3.58MHz,
1.0Vpp: −40 ~ 100IRE, Sine Wave Input
Load Resistance
Load Capacitance
C2 (Figure 3)
C3 (Figure 3)
PSRR
fin = 10kHz
VG1-0 bits = “00”(+6dB)
fin = 100kHz
2.62
-
-
Vpp
-
−40
−30
dB
140
150
-
Ω
-
-
15
pF
-
-
400
pF
-
60
-
dB
-
45
-
dB
LPF for VIN signal : (Note 15)
Frequency Response (f = 100kHz, 1.0Vpp, Sine wave Input)
Response at 6.75MHz
Response at 27MHz
Group Delay
|GD3MHz−GD6MHz|
−3.0
-
0
+1.5
−40
−30
dB
-
10
100
ns
Note 15. This is a value at measurement point in Figure 3. 1.0Vpp input is the value when VG1-0 bits =“00”. Input
amplitude is in inverse proportion to the gain. S/N is measured at measurement point 2.
Note 16. PMV bit must be set to “0” if the input impedance of the VIN pin exceeds 600Ω when the input signal is stopped
or when the VIN pin input circuit is powered down.
Note 17. S/N = 20xlog (Output Voltage[Vpp]/Noise Level[Vrms]). Output Voltage = 0.7 [Vpp].
From Video DAC
VIN pin
R1
C1
AK4950
MS1320-E-00
Figure 2. External Resistor of Video Signal Input pin
Measurement point1 Measurement point2
Video Signal Output
C2
75 ohm
R2
C3
R3
75 ohm
Figure 3. Load Capacitance C2 and C3
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2011/10