CXA2125Q データシートの表示（PDF） - Sony Semiconductor

部品番号

コンポーネント説明

メーカー

CXA2125Q

Audio/Video Switch with Electronic Volume for 3 Scart

Sony Semiconductor 

CXA2125Q

Description of Operation

1. Explanation of Video Section

The video section comprises of 16 high impedance inputs switched through to 7 video outputs. A +6dB internal

amplifier is connected to each output. The amplifier is required to compensate for the 6dB attenuation which

occurs at the external emitter follower stage used for driving video loads. All video outputs have an integrated

100Ω series protection resistor. The typical external configuration is shown in Fig. 1-1.

Scart In

75Ω

0.47µF

75Ω

VID_VCC = 9V

Switch

120kΩ

Vbias

Amp

100Ω

+12V

Scart Out

BC547B

75Ω

Load

1kΩ

75Ω

Video Element

Vbias

Fig. 1-1. Video Circuit Element: 6dB gain amplifier with external emitter follower

Switching the Video Outputs Off

Each video output can be individually turned off using the I2C. When turned off, the output dc voltage is

approximately 0V and hence the current consumption of the external emitter followers is reduced.

– 21 –

Share Link: