sm5309a Nippon Precision Circuits Inc, (NPC), sm5309a Datasheet - Page 14

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

(3) Power-down mode select
(4) Input multiplexer selection
(5) fc mode switching (1/2 cutoff frequency switching)
(6) Filter bypass mode
Register name: CONDITION2
Flag name: PD
This flag selects standard/power-down for the analog block.
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)”.
*1. n = 1, 2, 3
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.
Register name: CONDITION2
Flag name: BYPASS
This flag allows the internal lowpass filter in SM5309A 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
Flag name
Flag name
Flag name
BYPASS
HALF
MUX
PD
H
H
H
H
L
L
L
L
Filter bypass mode (signals bypass lowpass filter)
(CH-2, CH-3 cutoff frequency is 1/2 that of CH-1)
(CH-1, CH-2, CH-3 cutoff frequency is identical)
Filter mode (signals pass through lowpass filter)
Standard (normal operation)
Power-down (no operation)
Input selection
Standard fc mode
Half fc mode
fc mode
Mode
Filter
INnA
INnB
SM5309A
*1
Default
Default
Default
Default
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