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SM5309B Datasheet(PDF) 14 Page - Nippon Precision Circuits Inc

Part No. SM5309B
Description  3-channel Video Buffer with Built-in wideband LPF
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Maker  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
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SM5309B Datasheet(HTML) 14 Page - Nippon Precision Circuits Inc

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SM5309B
SEIKO NPC CORPORATION —14
(3) Power-down mode select
Register name: CONDITION2
Flag name: PD
This flag selects standard/power-down for the analog block.
(4) Input multiplexer selection
Register name: CONDITION2
Flag name: MUX
This flag selects the A or B input for all three channels (IN1
×, IN2×, IN3×). Note that this flag is significant
only when the MUXSEL input is LOW. See “Input Multiplexer Switching (MUXSEL)”.
(5) fc mode switching (1/2 cutoff frequency switching)
Register name: CONDITION2
Flag name: HALF
This flag switches the cutoff frequency of CH-2 and CH-3 to divide the value set by the FCSET register into
halves. Note that the CH-1 cutoff frequency cannot be switched to 1/2. This mode is suitable for systems
where the sampling frequency varies due to Y, Cr, and Cb requirements, such as component signals.
(6) Filter bypass mode
Register name: CONDITION2
Flag name: BYPASS
This flag allows the internal lowpass filter in SM5309B to be bypassed. Even in filter bypass mode, the
input type and multiplexer function can all be set just as in filter mode. However, the cutoff frequency and
fc mode settings have no effect on the outputs.
Flag name
Mode
Default
PD
L
Standard (normal operation)
H
Power-down (no operation)
Flag name
Input selection*1
*1. n = 1, 2, 3
Default
MUX
LINnA
HINnB
Flag name
fc mode
Default
HALF
L
Standard fc mode
(CH-1, CH-2, CH-3 cutoff frequency is identical)
H
Half fc mode
(CH-2, CH-3 cutoff frequency is 1/2 that of CH-1)
Flag name
Filter
Default
BYPASS
L
Filter mode (signals pass through lowpass filter)
H
Filter bypass mode (signals bypass lowpass filter)


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