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BH76816FVM-TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
Technical Note
7/16
BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM
www.rohm.com
2009.03 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
75Ω+75Ω=150Ω
a) Sag-free video signal (TG-7/1 output, H-bar)
b) BH768xxFVM output (input = 1.0 µF, TG-7/1 output, H-bar)
c) 1000 uF + 150 sag waveform (TG-7/1 output, H-bar)
Fig. 7
1μF
150k
Sag
Sag is determined
by input capacitor
and input
resistance only.
Cut-off frequency for input capacitor and input impedance is
the same as when the output capacitor is set at 1000 µF with
an ordinary 75 driver.
1 F X 150 K = 1000 F X 150
(Input terminal time constant) (Output terminal time constant)
H-bar signal's TV screen
output image
75Ω
75Ω
Monitor
75Ω
1μF
TG-7/1
BH768xxFVM
TG-7/1
75Ω
75Ω
Monitor
1000μF
Nearly identical sag characteristics
Fig. 8
Fig. 9
Fig. 10
150k
Technical Note
8/16
BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM
www.rohm.com
2009.03 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Application circuit
Fig. 11
※Although ROHM is confident that the example application circuit reflects the best possible
recommendations, be sure to verify circuit characteristics for your particular application.
High Active
Open Standby
Low Standby
VIDEO OUT
5
6
1
2
3
4
7
8
IN
VIDEO IN
10Ω(R2)
※
150k
3.3μF
(C2)
LPF
1.0μF(C3)
CHARGE PUNP
1.0μF(C18)
OUT
NVCC
GND
L:Standby
1.0μF(C7)
75Ω(R5)
6dB/9dB/
12dB/16.5dB
Technical Note
9/16
BH76806FVM, BH76809FVM, BH76812FVM, BH76816FVM
www.rohm.com
2009.03 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
1) Decoupling capacitor only
2) Decoupling capacitor + Resistance 10Ω
A
A
B
Vc c
Vc
c
A
A
A
C
Vc c
Vc
c
A
10
Ω
B
A
Current waveform (A) between single
power supply and capacitor
10mA/div
Current waveform (B)
between capacitor and IC
10mA/div
Current waveform (A) between single
power supply and capacitor
10mA/div
Current waveform (B)between single
power supply and capacitor
10mA/div
Current waveform (C)between single
power supply and capacitor
10mA/div
Fig. 12 Effect of Charge Pump Circuit's Current Ripple on External Circuit
Fig.13
1μF
DAC etc.
1.Effects of charge pump
circuit’s current ripple
Vcc
Vcc pin
3.3μF
-Vcc
1μF
75Ω
75Ω
V
OUT
2.Current ripple affects DAC, etc.
1μF
V
IN
VIDEO
AMP
Charge Pump
150kΩ
10Ω
Fig.14
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

BH76816FVM-TR

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Description:
Video ICs VIDEO DRVR 8-PIN
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New from this manufacturer.
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