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PDF LTC1264-7CS Data sheet ( Hoja de datos )
| Número de pieza | LTC1264-7CS | |
| Descripción | Linear Phase/ Group Delay Equalized/ 8th Order Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1264-7
Linear Phase, Group Delay
Equalized, 8th Order
Lowpass Filter
FEATURES
s Steeper Roll-Off Than Bessel Filters
s High Speed: fC ≤ 200kHz
s Phase Equalized Filter in a 14-Pin Package
s Phase and Group Delay Response Fully Tested
s Transient Response Exhibits 5% Overshoot and
No Ringing
s 65dB THD or Better Throughout a 100kHz Passband
s No External Components Needed
APPLICATI S
s Data Communication Filters
s Time Delay Networks
s Phase Matched Filters
DESCRIPTIO
The LTC1264-7 is a clock-tunable monolithic 8th order
lowpass filter with linear passband phase and flat group
delay. The amplitude response approximates a maximally
flat passband and exhibits steeper roll-off than an equiva-
lent 8th order Bessel filter. For instance, at twice the cutoff
frequency the filter attains 28dB attenuation (vs 12dB for
Bessel), while at three times the cutoff frequency the filter
attains 55dB attenuation (vs 30dB for Bessel). The cutoff
frequency of the LTC1264-7 is tuned via an external TTL or
CMOS clock.
The clock-to-cutoff frequency ratio of the LTC1264-7 can
be set to 25:1 (pin 10 to V+) or 50:1 (pin 10 to V –).
When the filter operates at clock-to-cutoff frequency ratio
of 25:1, the input is double-sampled to lower the risk of
aliasing.
The LTC1264-7 is optimized for speed. Depending on the
operating conditions, cutoff frequencies between 200kHz
and 250kHz can be obtained. (Please refer to the Passband
vs Clock Frequency graphs.)
The LTC1264-7 is pin-compatible with the LTC1064-X
series.
TYPICAL APPLICATI
200kHz Linear Phase Lowpass Filter
1 14
VIN 2
3
13
12 –8V
8V
4 LTC1264-7 11
fCLK = 5MHz
5 10 8V
6 9 VOUT
78
1264-7 TA01
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A
0.1µF CAPACITOR CLOSE TO THE PACKAGE AND ANY PRINTED
CIRCUIT BOARD ASSEMBLY SHOULD MAINTAIN A DISTANCE
OF AT LEAST 0.2 INCHES BETWEEN ANY OUTPUT OR INPUT
PIN AND THE fCLK LINE.
4-Level PAM Eye Diagram
fCLK = 5MHz
fC = 200kHz
500ns/DIV
1264-7 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1264-7
Passband Gain vs fCLK
5
4
VS = ±7.5V
(fCLK/fC) = 25:1
3 TA = 25°C
2
A. fCLK = 1MHz
B. fCLK = 2MHz
C. fCLK = 3MHz
D. fCLK = 4MHz
E. fCLK = 5MHz
1
0
–1
–2
–3 A B C D E
–4
–5
10
100
FREQUENCY (kHz)
1000
1264-7 G08
Passband Gain vs fCLK
5
4
VS = ±7.5V
(fCLK/fC) = 50:1
3 TA = 25°C
2
A. fCLK = 1MHz
B. fCLK = 2MHz
C. fCLK = 3MHz
D. fCLK = 4MHz
E. fCLK = 5MHz
1
0
–1
–2
–3 A B C D E
–4
–5
10
100
FREQUENCY (kHz)
1000
1264-7 G09
Passband Gain vs fCLK at 85°C
5
4
VS = ±7.5V
(fCLK/fC) = 25:1
A. fCLK = 4MHz
B. fCLK = 5MHz
3
2
1
0
–1 A B
–2
–3
–4
–5
10
100
FREQUENCY (kHz)
1000
1264-7 G10
Passband Gain vs fCLK at 85°C
5
4
VS = ±5V
(fCLK/fC) = 25:1
3
A. fCLK = 1MHz
B. fCLK = 2MHz
C. fCLK = 3MHz
2
1
0
–1
–2
A BC
–3
–4
–5
10
100
FREQUENCY (kHz)
1000
1264-7 G11
Gain vs fCLK
10
0
–10
– 20
AB
C
– 30
–40 A. fCLK = 0.5MHz
– 50
B. fCLK = 1MHz
C. fCLK = 2MHz
– 60
VS = SINGLE 5V
–70 (fCLK/fC) = 25:1
– 80
AGND = 2V
TA = 25°C
– 90
10
100
FREQUENCY (kHz)
200
1264-7 G14
Gain vs Frequency
10
0
–10
– 20
– 30
– 40
– 50
– 60
VS = ±7.5V
–70 fCLK = 5MHz
– 80
(fCLK/fC) = 25:1
TA = 25°C
– 90
10
100
FREQUENCY (kHz)
1000
1264-7 G12
Passband Gain vs fCLK
5
4
VS = SINGLE 5V
(fCLK/fC) = 25:1
3 AGND = 2V
TA = 25°C
2
A. fCLK = 0.5MHz
B. fCLK = 1.0MHz
C. fCLK = 1.5MHz
D. fCLK = 2.0MHz
1
0
–1
–2
–3 A B C D
–4
–5
10
100
FREQUENCY (kHz)
200
1264-7 G15
Gain vs Frequency
10
0
–10
– 20
– 30
– 40
– 50
– 60
VS = ±5V
–70 fCLK = 3MHz
– 80
(fCLK/fC) = 25:1
TA = 25°C
– 90
10
100
FREQUENCY (kHz)
Maximum Passband vs
Temperature
2
1
0
–1
A. TA = 70°C
–2 B. TA = –40°C
A
B
–3
VS = SINGLE 5V
–4
fCLK = 2MHz
(fCLK/fC) = 25:1
AGND = 2V
–5
1
10
FREQUENCY (kHz)
1000
1264-7 G13
100
1264-7 G16
5
5 Page 
LTC1264-7
APPLICATI S I FOR ATIO
Table 9. Maximum VIN vs VS and Clock
POWER SUPPLY
±7.5V
±5V
Single 5V
MAXIMUM fCLK
5.0MHz
4.5MHz
4.0MHz
≥ 3.5MHz
3.0MHz
≥ 3.0MHz
2.0MHz
MAXIMUM VIN
1.6VRMS (fIN ≥ 160kHz)
2.0VRMS (fIN ≥ 160kHz)
2.5VRMS (fIN ≥ 160kHz)
1.6VRMS (fIN ≥ 500kHz)
1.6VRMS (fIN ≥ 100kHz)
0.7VRMS (fIN ≥ 500kHz)
0.5VRMS (fIN ≥ 400kHz)
Transient Response
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
fCLK ±10%, will be aliased back into the filter’s passband.
If, for instance, an LTC1264-7 operating with a 100kHz
clock and 2kHz cutoff frequency receives a 95kHz 10mV
input signal, a 5kHz 56µVRMS alias signal will appear at its
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.
INPUT = 10kHz ± 3V
fCLK = 2.5MHz
RATIO = 25:1
10µs/DIV
Figure 5.
INPUT
90%
ts
OUTPUT
50% td
10% tr
RISE
TIME
(tr)
=
0.36
fCUTOFF
±5%
SETTLING
(TO 1% of
TIME (ts)
OUTPUT)
=
2
fCUTOFF
±5%
TIME DELAY (td) = GROUP
(TO 50% OF OUTPUT)
DELAY
≈
1.15
fCUTOFF
Figure 6.
1164-7 F06
Table 10. Aliasing (fCLK = 100kHz )
INPUT FREQUENCY
(VIN = 1VRMS,
fIN = fCLK ± fOUT)
(kHz)
25:1, fCUTOFF = 4kHz
175 (or 225)
180 (or 220)
185 (or 215)
190 (or 210)
195 (or 205)
50:1, fCUTOFF = 2kHz
75 (or 125)
80 (or 120)
85 (or 115)
90 (or 110)
95 (or 105)
99 (or 101)
OUTPUT LEVEL
(Relative to Input,
0dB = 1VRMS)
(dB)
– 76
– 69
– 62
– 43
–7
– 96
– 90
– 82
– 72
– 45
0
OUTPUT FREQUENCY
(Aliased Frequency
fOUT = ABS [fCLK ± fIN])
(kHz)
25
20
15
10
5
25
20
15
10
5
1
Table 11. Transient Response of LTC Lowpass Filters
LOWPASS FILTER
DELAY
TIME*
(SEC)
RISE SETTLING OVER-
TIME** TIME*** SHOOT
(SEC) (SEC) (%)
LTC1064-3 Bessel
LTC1164-5 Bessel
LTC1164-6 Bessel
0.50/fC
0.43/fC
0.43/fC
0.34 / fC
0.34 / fC
0.34 / fC
0.80/ fC
0.85/ fC
1.15/ fC
0.5
0
1
LTC1264-7 Linear Phase
LTC1164-7 Linear Phase
LTC1064-7 Linear Phase
1.15/fC
1.20/fC
1.20/fC
0.36/fC
0.39/fC
0.39/fC
2.05/ fC
2.20/ fC
2.20/ fC
5
5
5
LTC1164-5 Butterworth
0.80/fC 0.48/fC 2.40/fC 11
LTC1164-6 Elliptic
LTC1064-4 Elliptic
LTC1064-1 Elliptic
0.85/fC
0.90/fC
0.85/fC
0.54/fC
0.54/fC
0.54/fC
4.30/ fC
4.50/ fC
6.50/ fC
18
20
20
* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1264-7CS.PDF ] | |
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