AK4632VN AKM [Asahi Kasei Microsystems], AK4632VN Datasheet - Page 41

• Manufacturer Part Number: AK4632VN
• Description: 16-Bit ?? Mono CODEC with ALC & MIC/SPK/Video-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
Video-Amp has a drivability for a load resistance of 150Ω. The AK4632 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 41 and Figure 42. The capacitance for Sag Compensation circuit is 100µ F+2.2µ F or 47µ F+1.0µ F.
When DC output is used, VOUT pin and VSAG pin must be shorted. The output clamp voltage is 150mV(typ) at DC
output. SAGC1-0 bits and VVDD voltage should be set as shown in Table 23. Table 25 shows the gain and step of the
gain control. The gain is set by VGCA4-0 bits. PMV bit controls the power up and down of the video block. VOUT pin
outputs AVSS level at PMV bit = “1”.
MS0396-E-00
Video Block
Note : When the sag compensation circuit is used at less than 3.135V of VVDD, the GCA should be set to -1dB in
SAGC1 bit
DC output
Sag compensation
Sag compensation
order to avoid clipping of output video signal. Note that the video will become dark at that time.
0
1
1
0
YIN
YIN
Output Circuit
SAGC0 bit
0
0
1
1
CLAMP
CLAMP
Figure 41. Video block (using Sag Compensation circuit)
(C1=100µ F, C2=2.2µ F) or (C1=47µ F, C2=1.0µ F)
100µ F+2.2µ F
47µ F+1.0µ F
Table 23. Setting of VVDD and video output circuit.
Figure 42. Video block (at DC Output))
2.85V ≤ VVDD < 4.75V
4.5 V ≤ VVDD < 5.25V
2.8 V ≤ VVDD ≤ 3.6V
Table 24. Gain compensation
LPF
LPF
VVDD voltage
-1dB ~ +10.5dB
Step 0.5dB
-1dB ~ +10.5dB
Step 0.5dB
2.85V ≤ VVDD < 3.135 V
2.85V ≤ VVDD < 3.135 V
3.135 V ≤ VVDD ≤ 5.25V
3.135 V ≤ VVDD ≤ 5.25V
2.8 V ≤ VVDD ≤ 3.6V
- 41 -
GCA
GCA
VVDD voltage
Not Available
+6dB
+6dB
Sag compensation
Sag compensation
Output Circuit
VOUT
VOUT
VSAG
VSAG
DC output
C1
C2
GCA setting
-1dB (Note)
-1dB (Note)
75Ω
75Ω
0dB
0dB
0dB
Default
[AK4632]
2005/06