LTC1066-1CSW#TR Linear Technology, LTC1066-1CSW#TR Datasheet - Page 18

• Manufacturer Part Number: LTC1066-1CSW#TR
• Description: IC FILTER LP 8TH ORDER 18SOIC
• Manufacturer: Linear Technology

Specifications of LTC1066-1CSW#TR

• Filter Type: Bessel, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 50kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: 4.75 V ~ 16 V, ±2.375 V ~ 8 V
• Mounting Type: Surface Mount
• Package / Case: 18-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1066-1
TYPICAL APPLICATIO
18
R
P
C
50pF
1µF
0.1µF
0.1µF
0.1µF
0.1µF
P
500Ω
500Ω
12.1k
2k
1k
6
8
7
5V
2
3
4
5
9
CLOCK FREQUENCY DETECTOR
+
–
+
–
LTC1045
10
+
–
+
–
+
–
+
–
1
LTC1045
11
12
DC Accurate Clock-Tunable Lowpass Filter with Tunable Input Anti-Aliasing Filter
15
14
20
PULSE
OUTPUT
(Circuit provides at least – 20dB attenuation to input frequencies at 2f
13
0.1µF
R
19
18
17
16
AVERAGE
A
0.047µF
PULSE
C
U
A
LOWPASS ANTI-ALIASING FILTER
16
15
10
12
0.1µF
1
2
9
8
7
5
The clock-tunable range is 5 octaves.)
FIRST ORDER RC
–5V
LTC202
4
COMPONENT CALCULATIONS FOR A CLOCK-TUNABLE RANGE OF FIVE OCTAVES:
DEFINITIONS: 1. THE CUTOFF FREQUENCY OF LTC1066-1 IS ABBREVIATED AS f
COMPONENT CALCULATIONS:
EXAMPLE:
5V
13
0.1µF
3
14
11
6
2πR
C1 =
C2 = C1, C3 = 2•C1, C4 = 4•C1, C5 = 8•C1
C
C
LET’S CHOOSE A FIVE OCTAVE RANGE FROM 1kHz TO 32kHz. f
LET C
R1 = 1k, C1 = 0.001µF, C2 = 0.001µF, C3 = 0.0022µF, C4 = 0.0039µF,
C5 = 0.0082µF. C
2. f
3. A RANGE OF FIVE OCTAVES IS FROM f
P
A
1
= 50pF; R
= 0.047µF; R
C(LOW)
F
C2
C3
C4
C5
C
f
F
C(LOW)
F
= 1µF, THEN R
V
1
=
IN
R1
1k
IS THE LOWEST CUTOFF FREQUENCY OF INTEREST
f
C(LOW)
P
0.1µF
(TTL OR CMOS)
125
C
R
CLOCK INPUT
µF (f
=
IN
IN
A
*
*
50•f
P
=
C1
C(LOW)
= 50pF, R
; R
50•f
10
C(LOW)
5 × 10
F
IN
5
CALCULATES TO BE 20k. R
* = R
C(LOW)
IN Hz) ; R1 = 1k
0.1µF
200Ω
5
f
5V
C(LOW)
P
k
F
= 2k, C
(IF R
k
/125 ALLOWS FOR 0.2dB GAIN PEAK IN THE PASSBAND)
F
CAN BE CHOSEN TO BE 20k, R
A
= 0.047µF, R
C(LOW)
C
F
0.1µF
8TH ORDER LOWPASS FILTER
TO 32f
1
2
3
4
5
6
7
8
9
IN
A
CLOCK-TUNABLE,
CLK
OUT A
–IN A
+IN A
V
V
CON 1
F OUT
50/100
CLK
AND C
= 10k
–
+
C(LOW)
.
LTC1066-1
IN
20Ω
20Ω
R
OMITTED;
F
C(LOW)
COMP 2
COMP 1
OUT B
CON 2
C
+IN B
GND
IN
F
V
V
AND C
= 1kHz (1000Hz).
IN
+
–
18
17
16
15
14
13
12
11
10
IN
ARE OMITTED.
1066-1 TA07
0.1µF
0.1µF
–5V
V
OUT
10661fa