AK4635 Datasheet, PDF (58/81 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4635]
■ Video Block
Video-Amp has a drivability for a load resistance of 150Ω. The AK4635 has a composite input and output. A Low Pass
Filter (LPF) and Gain Control Amp (GCA) are integrated and both DC output and Sag Compensation circuit are
supported as shown in Figure 51 and Figure 52. The capacitance for Sag Compensation circuit is 100µF+4.7µF or
47µF+4.7µF. When DC output is used, the VOUT pin and the VSAG pin must be shorted. The output clamp voltage is 50
mV(typ) at DC output. SAGC bit should be set as shown in Table 45.VSAG2-0 bits should be set as shown in Table 46 at
SAGC bit = “1”. 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 VSS1 level at PMV bit = “0”.
VIN
CLAMP
LPF
GCA
C1 _75Ω
-1dB ~ +10.5dB
Step 0.5dB
+6dB ^VOUT
VSAG C2
(C1=100μ F, C2=4.7μ F) or (C1=47μ F, C2=4.7μ F)
Figure 51 Video block (using Sag Compensation circuit)
VIN
CLAMP
LPF
GCA
75Ω
-1dB ~ +10.5dB
Step 0.5dB
+6dB ^VOUT
VSAG
Figure 52. Video block (at DC Output)
Rev. 0.6
- 58 -
2007/10