SM5302A

NIPPON PRECISION CIRCUITS INC.—14

Flag settings

(1) Cutoff frequency

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”.

• FCDATA

• FCDATA

• k11

= − 1.95e − 4, k12 = 2.07e − 1, k13 = 4.74

• k21

= − 3.92e − 4, k22 = 4.33e − 1, k23 = − 41.2

(2) Input type switching (sync-tip clamp, bias, direct)

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.

FCDATA

FCSET

Flag name

Cutoff

frequency

[MHz]

Default

FCM

FC6

FC5

FC4

FC3

FC2

FC1

FC0

0

00h

00000000

4.74

1

01h

00000001

4.95

2

02h

00000010

5.15

:

125

7Dh

01111101

27.57

126

7Eh

01111110

27.73

127

7Fh

01111111

27.88

128

80h

10000000

7.80

129

81h

10000001

8.13

130

82h

10000010

8.47

:

253

FDh

11111101

43.26

254

FEh

11111110

43.49

255

FFh

11111111

43.73

Channel

Flag name

Input type

Default

CH-1

CH-2

CH-3

CB5

CB3

CB1

CB4

CB2

CB0

L

L

Sync-tip clamp input

L

H

Bias input

H

Don't care

*1. An input coupling capacitor should not be connected when direct input is selected.