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PDF AK4252 Data sheet ( Hoja de datos )
| Número de pieza | AK4252 | |
| Descripción | Output Coupling Capacitor-less Video Amp | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK4252 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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ASAHI KASEI
[AK4250/52]
= Preliminary =
AK4250/52
Output Coupling Capacitor-less Video Amp with LPF
GENERAL DESCRIPTION
The AK4250/52 are a Video Amp with LPF. The output coupling capacitor can be removed because the
AK4250/52 include the negative power supply circuit. The AK4250/52 are housed in a space-saving 8-pin
USON package.
FEATURE
1. Video Function
• A Composite Video Input
• A Video-Amp for Composite Video Signal
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AK4250: +6dB
Ak4252: +12dB
• Low Pass Filter
• Charge pump circuit for negative power supply
2. Ta = -40 ∼ 85 °C
3. Power Supply: 2.7 ∼ 3.6V (typ. 3.0V)
4. Power Supply Current: 10 mA
5. Package: 8 pin USON
Block Diagram
PDN
VIN
VDD
Clamp
Charge
Pump
LPF
Clock
Generator
CP CN VSS
VEE
Rev.0.4
Figure 1. AK4250/52 Block Diagram
-1-
VOUT
2006/11
1 page  
ASAHI KASEI
[AK4250/52]
Video Block
The Video Amp has a drivability for a load resistance of 150Ω. The AK4250/52 have a composite input and output and
includes a low pass filter (LPF). Internal negative power supply circuit supplies the negative voltage to the video amp and the
video amp 0V output is used for a pedestal level. Therefore, the output coupling capacitor can be removed.
AK4250/52
VDD
Charge
Pump
Negative Power
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CP CN VSS
VEE
C2
(+) 1uF
1uF C1
(+)
Note 6. C1 and C2 capacitors should have the low ESR (Equivalent Series Resistance) over all temperature range.
When these capacitors have the polarity, the positive polarity pin should be connected to the CP pin and the
VSS pin. Non polarity capacitors can also be used.
Figure 3. Negative Power Supply circuit
AK4250/52
VOUT
75Ω
0V
75Ω
Power Down Control
Figure 4. Video signal output
When the PDN pin is “L”, the AK4250/52 are forced to the Power Down Mode (Power consumption: typ 1μA). VOUT pin
becomes Hi-Z at PDN pin = “L”. The AK4250/52 include a power-on-reset function. Therefore any reset isn’t required
externally.
Rev.0.4
2006/11
-5-
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AK4252.PDF ] | |
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