AK4955 Datasheet, PDF (11/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
Parameter
Video Signal Input
External Resistor (Note 21) R1 (Figure 2)
External Capacitor
C1 (Figure 2)
Maximum Input Voltage: VG1-0 bits = “00” (+6dB)
Pull Down Current
Video Analog Output (Figure 3)
Output Gain
VG1-0 bits = “00”, 1.0Vpp Input
fin =100kHz
VG1-0 bits = “01”, 0.7Vpp Input
Sine wave Input
VG1-0 bits = “10”, 0.5Vpp Input
(Note 20)
VG1-0 bits = “11”, 0.3Vpp Input
DC Output Offset Level
(Note 20)
Signal Input
(Pedestal Level)
No Signal Input
S/N (Note 22)
BW = 100kH ∼ 6MHz,
VG1-0 bits = “00”(+6dB)
S = 0.7Vpp Input
Maximum Output Voltage
(Note 20)
fin =100kHz (Sine wave)
Secondary Harmonic Distortion
VG1-0 bits = “00”(+6dB), fin = 3.58MHz,
1.0Vpp: −40 ~ 100IRE, Sine Wave Input
min
-
0.05
-
-
5.5
8.5
11.5
16
−100
-
60
2.62
-
typ
-
0.1
1.0
0.5
6.0
9.0
12.0
16.5
0
−572
70
-
−40
max
Unit
600
Ω
0.2
μF
1.24
Vpp
-
μA
6.5
9.5
dB
12.5
17
100
mV
-
mV
-
dB
-
Vpp
−30
dB
Load Resistance
140
150
-
Ω
Load Capacitance
C2 (Figure 3)
-
-
15
pF
C3 (Figure 3)
-
-
400
pF
PSRR
fin = 10kHz
-
58
-
dB
VG1-0 bits = “00”(+6dB)
fin = 100kHz
-
53
-
dB
LPF for VIN signal : (Note 20)
Frequency Response (fin = 100kHz, 1.0Vpp, Sine wave Input)
Response at 6.75MHz
Response at 27MHz
−3.0
-
−0.5
−40
+2.0
−20
dB
Group Delay
|GD3MHz−GD6MHz|
-
15
100
ns
Note 20. 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 measuring point 2.
Note 21. PMV bit must be set to “0” if the input impedance of the VIN pin exceeds 600Ω in case of the input signal is
stopped or the input circuit of the VIN pin is powered down.
Note 22. S/N = 20xlog (Output Voltage[Vpp]/Noise Level[Vrms]). Output Voltage = 0.7 [Vpp].
VIN pin
From Video DAC
R1
C1
AK4955
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
MS1343-E-00
- 11 -
2011/12