sm5308av Nippon Precision Circuits Inc, (NPC), sm5308av Datasheet - Page 20

• Manufacturer Part Number: sm5308av
• Description: 3-channel Video Buffer With Built-in Wideband Lpf
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

USAGE PRECAUTIONS
Slave Address (94h) Setting
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 4 to reduce the risk of malfunction in the I
large external spikes or other noise invaded from outside. The recommended value is 10kΩ.
Direct Input Mode
In direct input mode, the signal is connected to the input without a capacitor. However, the input DC voltage
range varies with the mode setting, hence the signal must be appropriately biased for the corresponding mode.
The recommended LOW-level voltage (V
(see figure 5, V
occur in the output signal. (For preventing the device breakdown, input bottom voltage and top voltage should
be set within the absolute maximum ratings.)
Power Supply Invest Timing
The SM5308AV uses 2-type power supply, analog one (VCC1, VCC2, VCC3) and digital one (VDD). There-
fore all power supply pins should be forced voltage at the same time power supply invested. In the case analog
power supply and digital one are set up simultaneously, composing system the time-lag to makes short time as
standard under 1ms is need. And if voltage of digital power supply comes higher than one of analog power sup-
ply, it is necessary to set voltage of digital power supply to make potential difference bellow 100mV as com-
pared with voltage of analog one.
Table 3. Direct mode recommended input DC voltage range (V
Mode setting
Figure 4. Slave address 94h setting
h0
h6
i0
j0
i6
j6
CC
10k
10k
= 5V). If the input voltage exceeds these limits, be careful because harmonic distortion may
Slave address = 94h
Gain
0dB
6dB
VDD
ADS
VSS
Standard
Standard
fc mode
Half
Half
−
−
L
) and HIGH-level voltage (V
SM5308AV
Filter/Bypass
Bypass
Bypass
mode
Filter
Filter
CH-2, CH-3
CH-2, CH-3
CH-2, CH-3
CH-2, CH-3
CH-2, CH-3
CH-2, CH-3
Channel
CC
CH-1
CH-1
CH-1
CH-1
CH-1
CH-1
Figure 5. Direct input mode
= 5V)
H
) for each mode is shown in table 3
SEIKO NPC CORPORATION —20
V
L
1.3
1.3
1.4
1.1
1.7
1.7
1.7
1.6
Video Signal In
[V]
VCC
V
V
GND
H
L
2
C-BUS interface due to
V
H
2.9
2.9
2.9
3.3
3.0
3.0
3.0
3.0
INnA
INnB
[V]