ltc1164-6 Linear Technology Corporation, ltc1164-6 Datasheet - Page 9

• Manufacturer Part Number: ltc1164-6
• Description: Low Power 8th Order Pin Selectable Elliptic Or Linear Phase Lowpass Filter
• Manufacturer: Linear Technology Corporation

A
and 1kHz cutoff frequency receives a 98.5kHz, 10mV
input signal, a 1.5kHz, 10µV
its output. When the LTC1164-6 operates with a clock-to-
cutoff frequency of 50:1, aliasing occurs at twice the clock
frequency. Table 5 shows details.
Table 4. Maximum V
POWER SUPPLY
Table 5. Aliasing (f
INPUT FREQUENCY
f
f
TYPICAL
CLK
CLK
PPLICATI
(V
±7.5V
±5V
Single 5V
96
97
98
98.5 (or 101.5)
99
99.5 (or 100.5)
192 (or 208)
194 (or 206)
196 (or 204)
198 (or 202)
199 (or 201)
199.5(or 200.5)
/f
/f
IN
C
C
= 100:1, f
= 50:1, f
(kHz)
= 1V
(or 104)
(or 103)
(or 102)
(or 101)
RMS
CUTOFF
)
CUTOFF
A
O
CLK
PPLICATI
= 2kHz
IN
MAXIMUM f
= 1kHz
V
0.1µF
V
U
(Relative to Input)
= 100kHz)
vs V
IN
+
1.5MHz
OUTPUT LEVEL
≥1MHz
1MHz
1MHz
1MHz
1MHz
1MHz
S
S
– 68.0
– 65.0
– 60.0
– 68.0
– 63.0
– 76.0
and f
(dB)
–75.0
I FOR ATIO
– 3.2
– 0.5
– 3.4
– 1.3
– 0.9
U
RMS
CLK
CLK
O
alias signal will appear at
1
2
3
4
5
6
7
U
W
1V
3V
0.7V
2.5V
0.5V
0.7V
0.5V
S
LTC1164-6
MAXIMUM V
OUTPUT FREQUENCY
RMS
RMS
(Aliased Frequency)
RMS
RMS
RMS
RMS
RMS
(f
(f
IN
IN
(f
(f
(f
(f
(f
(kHz)
IN
IN
IN
IN
IN
4.0
3.0
2.0
1.5
1.0
0.5
8.0
6.0
4.0
2.0
1.0
0.5
> 35kHz)
> 25kHz)
8th Order Elliptic Lowpass Filter
> 250kHz)
> 25kHz)
> 100kHz)
> 25kHz)
> 100kHz)
14
13
12
11
10
9
8
IN
U
f
V
CLK
+
RMS
(f
V
CLK
OUT
/ f
C
0.1µF
R
) = 50:1
Table 6. Transient Response of LTC Lowpass Filters
LTC1064-3 Bessel
LTC1164-5 Linear Phase
LTC1164-6 Linear Phase
LTC1264-7 Linear Phase
LTC1164-7 Linear Phase
LTC1064-7 Linear Phase
LTC1164-5 Butterworth
LTC1164-6 Elliptic
LTC1064-4 Elliptic
LTC1064-1 Elliptic
* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
V
LOWPASS FILTER
–
INPUT
C
–
+
LT
RISE TIME (t
SETTLING TIME (t
(TO 1% of OUTPUT)
TIME DELAY (t
(TO 50% OF OUTPUT)
®
V
V
1006
10%
90%
50%
+
–
r
) =
d
) = GROUP DELAY ≈
t d
f
CUTOFF
0.54
s
) =
t s
0.50/f
0.43/f
0.43/f
0.80/f
0.85/f
0.90/f
0.85/f
DELAY
1.15/f
1.20/f
1.20/f
TIME*
f
(SEC)
CUTOFF
NOTES:
1. OPTIONAL OUTPUT BUFFER
2. PINS 1, 8, 13 CAN BE GROUNDED
Figure 4
±5%
4.3
t r
1/2πRC = (2)(f
OR LEFT FLOATING
C
C
C
C
C
C
C
C
C
C
±5%
0.34/f
0.34/f
0.34/f
0.36/f
0.39/f
0.39/f
0.48/f
0.54/f
0.54/f
0.54/f
TIME**
(SEC)
f
RISE
CUTOFF
0.85
CUTOFF
C
C
C
C
C
C
C
C
C
C
LTC1164-6
)
SETTLING OVER-
TIME*** SHOOT
0.80/f
0.85/f
1.15/f
2.05/f
2.20/f
2.20/f
2.40/f
4.30/f
4.50/f
6.50/f
1164-6 TA06
(SEC)
1164-6 F04
OUTPUT
C
C
C
C
C
C
C
C
C
C
(%)
0.5
11
18
20
20
11646fa
0
1
5
5
5
9