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SM5309B Datasheet(PDF) 16 Page - Nippon Precision Circuits Inc

Part No. SM5309B
Description  3-channel Video Buffer with Built-in wideband LPF
Download  24 Pages
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Maker  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
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SM5309B Datasheet(HTML) 16 Page - Nippon Precision Circuits Inc

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SM5309B
SEIKO NPC CORPORATION —16
RISET
RISET controls the internal current source, and its connection is essential. The recommended value (RISET) is
1.8k
Ω. In power-down mode and filter bypass mode, no current flows into RISET.
Note. A value other than 1.8k
Ω will change the current consumption of SM5309B. In the determination of
resistance value, caution should be taken to ensure the power dissipation does not exceed the absolute
maximum rating for the package.
Half fc Mode
In half fc mode, the CH-2 and CH-3 cutoff frequency is 1/2 that of the CH-1 cutoff frequency setting. Half fc
mode is useful for systems where the sampling frequency varies due to luminance (Y) and color difference sig-
nal (Cr, Cb) requirements as in component signals.
Group Delay Characteristics
The group delay varies with the cutoff frequency setting. Note also that in half fc mode, the group delay
between CH-1 and CH-2/CH-3 varies.
Filter Bypass Mode
In filter bypass mode, the internal lowpass filter in SM5309B is bypassed and the signal is input to the output
buffer stage directly. In filter bypass mode, the input type and multiplexer function are set just as for filter
mode. But the cutoff frequency setting and fc mode setting have no effect on the outputs. In this mode, the
passband frequency is 80MHz (typ), which can support SXGA-class signals.
Input Multiplexer Switching (MUXSEL)
The input multiplexer setting can also be set using the MUXSEL input. When set using the I2C-BUS, a certain
amount of communication time is required, but the setting can be made using the MUXSEL input with arbi-
trary timing for high-speed switching. The input circuit of MUXSEL pin is placed in analog supply (VCC,
GND) area.
Figure 1. Cutoff frequency vs. FCDATA (RISET = 1.8kΩ)
MUXSEL pin
MUX flag
Multiplexer selection*1
*1. n = 1, 2, 3
L: GND
L
INnA
L: GND
H
INnB
H: VCC
L
INnB
H: VCC
H
INnB
0
5
10
15
20
25
30
35
40
45
50
128
96
64
32
0
160
192
224
256
FCDATA


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