sm5309a Nippon Precision Circuits Inc, (NPC), sm5309a Datasheet - Page 18

• Manufacturer Part Number: sm5309a
• Description: 3-channel Video Buffer With Built-in Wideband Lpf
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

USAGE PRECAUTIONS
Slave Address Setting
When slave address 92h is used, the ADS pin pull-up to VCC. When slave address 94h is used, the ADS input
must be left open circuit. In this case, an external resistor should be connected as shown in figure 2 to reduce
the risk of malfunction in the I
recommended value is 10kΩ.
Direct Input Mode
In direct input mode, the signal is connected to the input without an input capacitor. However, the input DC
voltage range varies with the use situation, hence the signal must be appropriately biased for the use situation.
If the input voltage exceeds “Direct mode input DC voltage range” (see “Analog input characteristics”), take
care of harmonic distortion may occur in the output signal. (For defending device breakdown occur, input bot-
tom voltage and top voltage should be set within the absolute maximum ratings.)
Power Supply Invest Timing
The SM5309A uses 2-type power supply, analog one (VCC) and I
supply pins should be forced voltage at the same time power supply invested. In the case analog power supply
and I
1ms is need. And if voltage of I
it is necessary to set voltage of I
compared with voltage of analog one.
2
C-BUS one are set up separately, composing system the time-lag to makes short time as standard under
Figure 2. Slave address 94h setting
10k
10k
Slave address = 94h
2
2
2
C-BUS interface due to large spikes or other noise invaded from outside. The
VCC
ADS
GND
C-BUS interface power supply comes higher than one of analog power supply,
C-BUS interface power supply to make potential difference bellow 250mV as
SM5309A
2
C-BUS one (VDD). Therefore all power
Figure 3. Direct input mode
SEIKO NPC CORPORATION —18
Video Signal In
VCC
V
V
GND
H
L
INnA
INnB