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BH76809FVM Datasheet(PDF) 5 Page - Rohm |
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BH76809FVM Datasheet(HTML) 5 Page - Rohm |
5 / 17 page Technical Note 5/16 BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM www.rohm.com 2009.03 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. ●Pin descriptions 7 NVCC -VCC (-2.75V) Flying capacitor “-”pin (8pin) 8 C2 0V ↑↓ -VCC (-2.75V) * 1 The DC voltage in the figure is VCC = 3.0 V. These values are for reference only and are not guaranteed. * 2 These values are for reference only and are not guaranteed. ●Description of operations 1) Principles of video driver with no output coupling capacitor When the amplifier operates using single voltage power supply, the operating potential point is approximately 1/2 Vcc. Therefore, a coupling capacitor is required to prevent DC output. For the video driver, the load resistance is 150 Ω (75 Ω + 75 Ω). Therefore, the coupling capacitor should be about 1000 µF when a low bandwidth for transmission is considered. (See Figure 3.) When the amplifier operates using a dual (±) power supply, the operating point can be set at GND level, and therefore, there is no need for a coupling capacitor to prevent DC output. Since a coupling capacitor is not needed, there is no sagging of low-frequency characteristics in output stage. (See Figure 4.) 2) Generation of negative voltage by charge pump circuit As is shown in Figure 5, the charge pump consists of a pair of switches (SW1 and SW2) and a pair of capacitors (flying capacitor and load capacitor), generating a negative voltage. When +3 V is applied to this IC, approximately -2.83 V of negative voltage is obtained. 0V VCC NVC C1 C2 VCC C2 NVCC GND VCC GND VCC VCC NVC Load voltage pins (7 pins) Amp (Dual power supply) VCC -VCC 75Ω 75Ω Amp (Single power supply) VCC 75Ω 75Ω 1/2VCC Bias 1000μF Fig.3 Fig.4 Output capacitor is required due to DC voltage at output pin Output capacitor is not required since DC voltage is not applied to output pin |
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