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SM5301AS 数据表(PDF) 10 Page - Nippon Precision Circuits Inc

部件名 SM5301AS
功能描述  3-channel Video Buffer with Built-in Wideband Filters
Download  12 Pages
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制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc

SM5301AS 数据表(HTML) 10 Page - Nippon Precision Circuits Inc

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SM5301AS
NIPPON PRECISION CIRCUITS INC.—10
TYPICAL APPLICATION CIRCUITS
ATSC Digital TV Application
(*1) Pins without an input signal, set by NUXSEL, should be left open or tied to GND.
(*2) Connect 4
× 0.1µF capacitor between the supply pins close to the IC.
(*3) Connect a 47
µF capacitor between the supply pins close to the IC.
(*4) GS
×1 are 3-level pins. Connect a capacitor if an error occurs due to external noise. Also, if open-circuit,
the internal impedance and external capacitance (C) form an RC network. When power is applied, the
open-circuit potential rises with time constant
τ = C × 10k (sec).
(*5) Printed circuit board supply wiring
I
If the supply is used for other digital circuits, there is a possibility that noise will be introduced. Accord-
ingly, these circuits should be connected to the application’s analog supply.
I
Ground-plane wiring should be performed, as much as possible, to provide low GND line impedance.
I
If ground-plane wiring up to the GND pins is difficult, the ground plane should be as close to the IC as
possible with a separate wire to each GND pin.
Input Capacitor and Cutoff Frequency
The capacitor connected to pins RINA/YINA, RINB/YINB, GINA/UINB, GINB/UINB, BINA/VINA, and BINB/VINB
forms a highpass filter (HPF) with the internal impedance.
The HPF cutoff frequency is given by the following equation.
(C: input capacitance, R: signal input impedance = 9.3k
Ω)
Cut-off
control voltage
+5V
(*2)
(*3)
BIN/VIN
1.0
µF
GIN/UIN
1.0
µF
(*1)
(*4)
GSB1
DISABLE
(*1)
(*2)
220
µF
B/V
+
75
220
µF
R/Y
+
75
(*4)
GSG1
(*4)
GSR1
RIN/YIN
1.0
µF
SYNC
(*1)
(*2)
(*2)
220
µF
G/U
+
75
fc =
1
2
πCR


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