sm5302a Nippon Precision Circuits Inc, (NPC), sm5302a Datasheet - Page 14

• Manufacturer Part Number: sm5302a
• Description: 3-channel Video Buffer With Built-in Wideband Lpf
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Flag settings
(1) Cutoff frequency
(2) Input type switching (sync-tip clamp, bias, direct)
Register name: FCSET
Flag names: FCM, FC [6:0]
The FCSET register setting sets the cutoff frequency using one of two tuning adjustment functions, thus a
total of 256 values are possible. The cutoff frequency is determined by the following equations. The values
are shown in “Lowpass Filter”.
The coefficients when R
Register name: CONDITION1
Flag names: CB [5:4], CB [3:2], CB [1:0]
These flags set the input type of CH-1, CH-2, and CH-3 to one of three types: sync-tip clamp input, bias
input, or direct input.
*1. An input coupling capacitor should not be connected when direct input is selected.
• FCDATA = 0 to 127 : fc = k11 × FCDATA
• FCDATA = 128 to 255: fc = k21 × FCDATA
• k11 = − 1.95e − 4, k12 = 2.07e − 1, k13 = 4.74
• k21 = − 3.92e − 4, k22 = 4.33e − 1, k23 = − 41.2
FCDATA
125
126
127
128
129
130
253
254
255
0
1
2
Channel
CH-1
CH-2
CH-3
FCSET
7Dh
7Eh
FDh
FEh
FFh
00h
01h
02h
7Fh
80h
81h
82h
ISET
FCM
0
0
0
0
0
0
1
1
1
1
1
1
= 1.8kΩ are:
CB5
CB3
CB1
FC6
H
0
0
0
1
1
1
0
0
0
1
1
1
L
L
:
:
FC5
Flag name
0
0
0
1
1
1
0
0
0
1
1
1
SM5302A
FC4
Flag name
0
0
0
1
1
1
0
0
0
1
1
1
2
2
+ k12 × FCDATA + k13 [MHz]
+ k22 × FCDATA + k23 [MHz]
Don't care
CB4
CB2
CB0
FC3
H
0
0
0
1
1
1
0
0
0
1
1
1
L
FC2
0
0
0
1
1
1
0
0
0
1
1
1
FC1
0
0
1
0
1
1
0
0
1
0
1
1
Sync-tip clamp input
Direct input
SEIKO NPC CORPORATION —14
Input type
FC0
Bias input
0
1
0
1
0
1
0
1
0
1
0
1
frequency
*1
Cutoff
[MHz]
27.57
27.73
27.88
43.26
43.49
43.73
4.74
4.95
5.15
7.80
8.13
8.47
Default
Default