Linear LTC6602, Быстрый старт, Страница: 3 / 8

DC1304 QUICK START GUIDE
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LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E
FCLK R ange, 24M H z to 90M H z FCLK R ange, 24M H z to 90M H z FCLK R ange, 24M H z to 90M H z FCLK R ange, 24M H z to 90M H z
RBIAS = (4.941 10^9) / FCLK; R BIAS in k
Example: If FCLK = 50 M H z Then
RBIAS = (4.941 10^9) / (50 10^6) = 98.82k
The Low pass FCUTOFF = FCLK / N LP
The H ighpass FCU TO FF = FCLK / NH P
NLP and NH P are the clock dividers set by the
(LPF1, LPF0) and (H PF1, H PF0) inputs respectively.
LPF1 LPF0 NLP HPF1 HPF0 NHP
0 0 600 0 0 6000
0 1 300 0 1 2000
1 0 100 1 0 1000
1 1 100 1 1 Bypass
HPF
Low pass Filter FCU TO FF Low pass Filter FCU TO FF Low pass Filter FCU TO FF Low pass Filter FCU TO FF R ange R ange R ange R ange
NLP Range
100 240kH z – 900kH z
300 80kH z – 300kH z
600 40kH z – 150kH z
H ighpass Filter FCU TO FF
H ighpass Filter FCU TO FF H ighpass Filter FCU TO FF
H ighpass Filter FCU TO FF R ange
R ange R ange
R ange
NHP Range
1000 24kH z – 90kH z
2000 12kH z – 45kH z
6000 4kH z – 15kH z
LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E LTC6602 FCLK AN D FCU TO FF R AN G E
FCLK R ange, 12M H z to 80M H z FCLK R ange, 12M H z to 80M H z FCLK R ange, 12M H z to 80M H z FCLK R ange, 12M H z to 80M H z
RBIAS = (2.472 10^9) / FCLK; R BIAS in k
Example: If FCLK = 50 M H z Then
RBIAS = (2.472 10^9) / (50 10^6) = 49.44k
The Low pass FCUTOFF = FCLK / N LP
NLP clock divider set by the (LPF1, LPF0) inputs.
Low pass Filter Low pass Filter Low pass Filter Low pass Filter FCU TO FF R ange FCU TO FF R ange FCU TO FF R ange FCU TO FF R ange
NLP Range
32 375kH z – 2.5M H z
128 93.75kH z – 625kH z
512 23.44kH z – 156.25kH z
LPF1 LPF0 NLP
0 0 512
0 1 128
1 0 32
1 1 32