AK4636 Datasheet, PDF (66/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ Video Block
The AK4636 has a Video-Amp with drivability for a load resistance of 150Ω. It has a composite input and output. A Low
Pass Filter (LPF) and Gain Control Amp (GCA) are integrated and DC output is supported as shown in Figure 54. The
output clamp voltage is 50 mV(typ) at DC output. The gain control and the step are shown in Table 56. The gain can be set
by VGCA4-0 bits. PMV bit controls the power up and down of the video block. The VOUT pin outputs 0V at PMV bit =
“0”. When no data is input to the VIN pin, PMV bit must be “0”.
VIN
0.1uF (±50% )
CL AMP
LPF
GCA
-1dB ~ +10.5dB
Step 0.5dB
+6dB
75Ω
VOUT
Figure 54. Video Block
VGCA4-0 bits
GAIN(dB)
STEP
17H
+10.5dB
16H
+10.0dB
15H
+9.5dB
:
:
0.5dB
04H
+1.0dB
03H
+0.5dB
02H
0.0dB
(default)
01H
−0.5dB
00H
−1.0dB
Table 56. Recommended Value of Video Input Resistance
■ Video Input
The video input signals must be C coupled by a 0.1μF (±50%) capacitor. The output impedance of video input signal
source should be 30Ω~390Ω(±5%).
MS1012-E-01
- 66 -
2010/08