LTC1066-1CS View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1066-1CS
Linear Technology
LTC1066-1CS Datasheet PDF : 16 Pages
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LTC1066-1
TYPICAL APPLICATIONS
5V
1µF
12.1k
2
0.1µF
2k
0.1µF
3
1k
4
0.1µF
500Ω
0.1µF
5
9
500Ω
DC Accurate Clock-Tunable Lowpass Filter with Tunable Input Anti-Aliasing Filter
(Circuit provides at least – 20dB attenuation to input frequencies at 2fCLK.
The clock-tunable range is 5 octaves.)
0.1µF
1
20
LTC1045
+
19
–
+
18
–
+
17
–
+
16
–
10 11 12 13
FIRST ORDER RC
LOWPASS ANTI-ALIASING FILTER
–5V 5V
0.1µF
0.1µF
4
13
1 LTC202
2
3
VIN
R1
1k
C2
C1
16
15
14 C3
9
10
11 C4
8
7
6
C5
RIN*
5
12
CIN*
0.1µF
5V
0.1µF
200Ω
CLOCK-TUNABLE,
8TH ORDER LOWPASS FILTER
20Ω
RF
CF
LTC1066-1
1 OUT A
V + 18
2 –IN A
OUT B 17
3 +IN A
+IN B 16
4 V–
GND 15
5 V+
6 CON 1
FIN 14
COMP 2 13
7 F OUT
CON 2 12
8 50/100 COMP 1 11
9 CLK
V – 10
VOUT
0.1µF
LTC1045
6+
8–
CP
50pF
+
7
RP
–
15
PULSE
AVERAGE
14 RA
CA
0.047µF
PULSE
OUTPUT
CLOCK FREQUENCY DETECTOR
CLOCK INPUT
(TTL OR CMOS)
20Ω
0.1µF
–5V
0.1µF
COMPONENT CALCULATIONS FOR A CLOCK-TUNABLE RANGE OF FIVE OCTAVES:
DEFINITIONS:1.THE CUTOFF FREQUENCY OF LTC1066-1 IS ABBREVIATED AS f C
2.f C(LOW) IS THE LOWEST CUTOFF FREQUENCY OF INTEREST
3.A RANGE OF FIVE OCTAVES IS FROM f
C(LOW) TO 32fC(LOW)
COMPONENT CALCULATIONS:
1
2πRFCF
=
f
fC(LOW)
125
;
RIN*
=
RF (IF RF CAN BE CHOSEN
C(LOW)/125 ALLOWS FOR
TO BE
0.2dB
20k, RIN AND CIN ARE OMITTED.
GAIN PEAK IN THE PASSBAND)
C1
=
1
fC(LOW)
µF (fC(LOW)
IN Hz) ;
R1
=
1k
C2 = C1, C3 = 2•C1, C4 = 4•C1, C5 = 8•C1
CP = 50pF; RP =
105
50•fC(LOW)
k
CA
=
0.047µF;
RA
=
5 × 105
50•fC(LOW)
k
EXAMPLE:
LET’S CHOOSE A FIVE OCTAVE RANGE FROM 1kHz TO 32kHz. fC(LOW) = 1kHz (1000Hz).
LET CF = 1µF, THEN RF CALCULATES TO BE 20k. RIN AND CIN OMITTED;
R1 = 1k, C1 = 0.001µF, C2 = 0.001µF, C3 = 0.0022µF, C4 = 0.0039µF,
C5 = 0.0082µF. CP = 50pF, RP = 2k, CA = 0.047µF, RA = 10k
1066-1 TA08
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
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