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BH76812FVM-TR Datasheet(PDF) 5 Page - Rohm

Part # BH76812FVM-TR
Description  Output Capacitor-less Video Drivers
Download  17 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BH76812FVM-TR Datasheet(HTML) 5 Page - Rohm

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Technical Note
5/16
BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM
www.rohm.com
2014.08 - Rev.B
© 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
NVCC
C1
C2
NVCC
Load voltage pins (7 pins)
Amp (Dual power supply)
VCC
-VCC
75
75
Amp (Single power supply)
VCC
75
75
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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