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PDF AK4250 Data sheet ( Hoja de datos )
| Número de pieza | AK4250 | |
| 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 AK4250 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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ASAHI KASEI
[AK4250]
AK4250
Output Coupling Capacitor-less Video Amp with LPF
GENERAL DESCRIPTION
The AK4250 is a Video Amp with LPF. The output coupling capacitor can be removed because the
AK4250 includes the negative power supply circuit. The AK4250 is housed in a space-saving 8-pin
USON package.
FEATURE
1. Video Function
• A Composite Video Input
• A Video-Amp (+6dB) for Composite Video Signal
• Low Pass Filter
www.DataSheet4U.c•oCmharge 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
MS0540-E-00
Figure 1. AK4250 Block Diagram
-1-
VOUT
2007/03
1 page  
ASAHI KASEI
[AK4250]
■ Video Block
The Video Amp has a drivability for a load resistance of 150Ω. The AK4250 has a composite input and output and
includes a low pass filter (LPF). Internal negative power supply circuit supplies negative voltage to the video amp and
video amp 0V output is used for a pedestal level. Therefore, the output coupling capacitor can be removed.
AK4250
VDD
Charge
Pump
Negative Power
www.DataSheet4U.com
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
VOUT
75Ω
0V
75Ω
■ Power Down Control
Figure 4. Video signal output
When the PDN pin is “L”, the AK4250 is forced to the Power Down Mode (Power consumption: typ 1μA). VOUT pin
becomes Hi-Z at PDN pin = “L”. The AK4250 includes a power-on-reset function. Therefore any reset isn’t required
externally.
MS0540-E-00
-5-
2007/03
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AK4250.PDF ] | |
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