LTC1264-7CSW#PBF Linear Technology, LTC1264-7CSW#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC1264-7CSW#PBF
• Description: IC FILTER 8TH ORDR LOWPASS16SOIC
• Manufacturer: Linear Technology

Specifications of LTC1264-7CSW#PBF

• Filter Type: Linear Phase, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 200kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: ±2.375 V ~ 8 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A
Table 9. Maximum V
POWER SUPPLY
±7.5V
±5V
Single 5V
Transient Response
PPLICATI
INPUT
INPUT = 10kHz ± 3V
f
RATIO = 25:1
RISE TIME (t
SETTLING TIME (t
(TO 1% of OUTPUT)
TIME DELAY (t
(TO 50% OF OUTPUT)
CLK
10%
90%
50%
= 2.5MHz
O
r
IN
) =
d
U
) = GROUP DELAY ≈
vs V
t d
f
MAXIMUM f
CUTOFF
0.36
s
) =
S
≥ 3.5MHz
≥ 3.0MHz
4.5MHz
4.0MHz
5.0MHz
3.0MHz
2.0MHz
t s
S
f
CUTOFF
Figure 6
and Clock
±5%
t r
I FOR ATIO
2
Figure 5
U
10µs/DIV
±5%
CLK
f
CUTOFF
1.15
W
1.6V
2.0V
2.5V
1.6V
1.6V
0.7V
0.5V
MAXIMUM V
RMS
RMS
RMS
RMS
RMS
RMS
RMS
(f
(f
(f
(f
(f
(f
(f
1164-7 F06
OUTPUT
IN
IN
IN
IN
IN
IN
IN
U
≥ 160kHz)
≥ 160kHz)
≥ 160kHz)
≥ 500kHz)
≥ 100kHz)
≥ 500kHz)
≥ 400kHz)
IN
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and it occurs when input frequencies close to the
sampling frequency are applied. For the LTC1264-7 case
at 50:1, an input signal whose frequency is in the range of
f
If, for instance, an LTC1264-7 operating with a 100kHz
clock and 2kHz cutoff frequency receives a 95kHz 10mV
input signal, a 5kHz 56µV
output. When the LTC1264-7 operates with a clock-to-
cutoff frequency of 25:1, aliasing occurs at twice the clock
frequency. Table 10 shows details.
Table 10. Aliasing (f
INPUT FREQUENCY
25:1, f
175 (or 225)
180 (or 220)
185 (or 215)
190 (or 210)
195 (or 205)
50:1, f
75 (or 125)
80 (or 120)
85 (or 115)
90 (or 110)
95 (or 105)
99 (or 101)
Table 11. Transient Response of LTC Lowpass Filters
LOWPASS FILTER
LTC1064-3 Bessel
LTC1164-5 Bessel
LTC1164-6 Bessel
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%
CLK
f
IN
(V
= f
IN
±10%, will be aliased back into the filter’s passband.
CUTOFF
CUTOFF
(kHz)
CLK
= 1V
± f
RMS
OUT
= 4kHz
= 2kHz
,
)
CLK
(Relative to Input,
= 100kHz)
OUTPUT LEVEL
0dB = 1V
0.50/f
0.43/f
0.43/f
1.15/f
1.20/f
1.20/f
0.80/f
0.85/f
0.90/f
0.85/f
DELAY
TIME*
(SEC)
RMS
– 69
– 62
– 43
– 90
– 82
– 72
– 45
(dB)
–76
–96
– 7
0
C
C
C
C
C
C
C
C
C
C
RMS
alias signal will appear at its
)
0.34/f
0.34/f
0.34/f
TIME**
0.36/f
0.39/f
0.39/f
0.48/f
0.54/f
0.54/f
0.54/f
(SEC)
RISE
C
C
C
C
C
C
C
C
C
C
f
LTC1264-7
OUTPUT FREQUENCY
OUT
(Aliased Frequency
SETTLING OVER-
TIME*** SHOOT
= ABS [f
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
(SEC)
(kHz)
25
20
15
10
25
20
15
10
5
5
1
C
C
C
C
C
C
C
C
C
C
CLK
13
± f
(%)
0.5
11
18
20
20
12647fa
0
1
5
5
5
IN
])