AK4250_10 参数 Datasheet PDF下载

[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

CP

(+)

CN

1uF

C1

VSS

C2

(+)

VEE

1uF

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

75Ω

VOUT

75Ω

0V

Figure 4. Video signal output

■

Power Down Control

When the PDN pin is “L”, the AK4250 is forced to the Power Down Mode (Power consumption: typ 1μA). The VOUT

pin becomes Hi-Z at the PDN pin = “L”. The AK4250 includes a power-on-reset function. Therefore any reset is not

required externally.

MS0540-E-04

-5-

2010/06