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PDF LTC1164-7 Data sheet ( Hoja de datos )
| Número de pieza | LTC1164-7 | |
| Descripción | Low Power/ Linear Phase 8th Order Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1164-7
Low Power, Linear Phase
8th Order Lowpass Filter
FEATURES
s Better Than Bessel Roll-Off
s fCUTOFF up to 20kHz, Single 5V Supply
s ISUPPLY = 2.5mA (Typ), Single 5V Supply
s 75dB THD + Noise with Single 5V Supply
s Phase and Group Delay Response Fully Tested
s Transient Response with No Ringing
s Wide Dynamic Range
s No External Components Needed
APPLICATI S
s Data Communication Filters
s Time Delay Networks
s Phase Matched Filters
TYPICAL APPLICATI
10kHz Linear Phase Lowpass Filter
1 14
VIN 2
3
13
12 –5V
5V
4 LTC1164-7 11
CLK = 500kHz
5 10 5V
6 9 VOUT
78
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.
1164-7 TA01
DESCRIPTIO
The LTC1164-7 is a low power, 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 equivalent 8th order Bessel filter. For instance, at twice
the cutoff frequency the filter attains 34dB attenuation
(vs12dB for Bessel), while at three times the cutoff fre-
quency the filter attains 68dB attenuation (vs 30dB for
Bessel). The cutoff frequency of the LTC1164-7 is tuned
via an external TTL or CMOS clock.
Low power is achieved without sacrificing dynamic range.
With single 5V supply, the S/N + THD is up to 75dB.
Optimum 91dB S/N is obtained with ±7.5V supplies.
The clock-to-cutoff frequency ratio of the LTC1164-7 can
be set to 50:1 (pin 10 to V+) or 100:1 (pin 10 to V –).
When the filter operates at the clock-to-cutoff frequency
ratio of 50:1, the input is double-sampled to lower the risk
of aliasing.
The LTC1164-7 is pin-compatible with the LTC1064-X
series and LTC1264-7.
Frequency Response
0
– 10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
1
GAIN
DELAY
10
FREQUENCY (kHz)
150
140
130
120
110
100
90
80
70
100
1164-7 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Passband Gain vs Frequency
and fCLK
5
4
VS = ±5V
fC = 5kHz
3 (fCLK/fC) = 50:1
TA = 25°C
2
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
1
0
–1
–2
–3 A B C D
–4
–5
1 10 100
FREQUENCY (kHz)
1164-7 G09
Passband Gain vs Frequency
and fCLK
5
4
VS = SINGLE 5V
(fCLK/fC) = 50:1
3 TA = 85°C
2
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
1
0
–1
–2
–3 A B C D
–4
–5
1
10
FREQUENCY (kHz)
100
1164-7 G12
Passband Gain vs Frequency
and fCLK
5
4
VS = ±5V
(fCLK/fC) = 50:1
3 TA = 85°C
2
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
1
0
–1
–2
–3 A B C D
–4
–5
1 10 100
FREQUENCY (kHz)
1164-7 G10
Delay vs Frequency and fCLK
250
A
200
VS = ±5V
(fCLK/fC) = 50:1
TA = 25°C
150
B
100
C
D
50
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
0
24 6
8 10 12 14 16 18 20 22
FREQUENCY (kHz)
1264-7 G13
THD + Noise vs Frequency
– 40
–45 VS = ±7.5V
VIN = 2VRMS
– 50 fCLK = 500kHz
– 55
(fCLK/fC) = 50:1
(5 REPRESENTA-
– 60 TIVE UNITS)
– 65
– 70
– 75
– 80
– 85
– 90
1
5
FREQUENCY (kHz)
10
1164-7 G15
THD + Noise vs Frequency
– 40
–45 VS = ±5V
VIN = 1VRMS
– 50 fCLK = 500kHz
– 55
(fCLK/fC) = 50:1
(5 REPRESENTA-
– 60 TIVE UNITS)
– 65
– 70
– 75
– 80
– 85
– 90
1
5
FREQUENCY (kHz)
10
1164-7 G16
LTC1164-7
Passband Gain vs Frequency
and fCLK
5
4
VS = ±5V
(fCLK/fC) = 100:1
3 TA = 25°C
2
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
1
0
–1
–2
–3 A B C D
–4
–5
1
10
FREQUENCY (kHz)
100
1164-7 G11
Delay vs Frequency and fCLK
500
450 A
400
VS = ±5V
(fCLK/fC) = 100:1
TA = 25°C
350
300
250 B
200
C
150
A. fCLK = 250kHz
B. fCLK = 500kHz
C. fCLK = 750kHz
D. fCLK = 1000kHz
100 D
50
0
12 3
4 5 6 7 8 9 10 11
FREQUENCY (kHz)
1264-7 G14
THD + Noise vs Frequency
– 40
–45 VS = ±7.5V
VIN = 2VRMS
– 50 fCLK = 500kHz
– 55
(fCLK/fC) = 100:1
(5 REPRESENTA-
– 60 TIVE UNITS)
– 65
– 70
– 75
– 80
– 85
– 90
1
23
FREQUENCY (kHz)
45
1164-7 G17
5
5 Page 
APPLICATI S I FOR ATIO
Transient Response
INPUT = 1kHz ± 3V
fCLK = 500kHz
fC = 10kHz
VS = ±7.5V
100µs/DIV
Figure 5.
INPUT
90%
ts
50% td
1164-7 F05
OUTPUT
LTC1164-7
If, for instance, an LTC1164-7 operating with a 100kHz
clock and 1kHz cutoff frequency receives a 98kHz 10mV
input signal, a 2kHz, 143µVRMS alias signal will appear at
its output. When the LTC1164-7 operates with a clock-to-
cutoff frequency of 50:1, aliasing occurs at twice the clock
frequency. Table 11 shows details.
Table 11. Aliasing (fCLK = 100kHz )
INPUT FREQUENCY
(VIN = 1VRMS,
fIN = fCLK ± fOUT)
(kHz)
50:1, fCUTOFF = 2kHz
190 (or 210)
195 (or 205)
196 (or 204)
197(or 203)
198 (or 202)
199.5 (or 200.5)
100:1, fCUTOFF = 1kHz
97 (or 103)
97.5 (or 102.5)
98 (or 102)
98.5 (or 101.5)
99 (or 101)
99.5 (or 100.5)
OUTPUT LEVEL
(Relative to Input,
0dB = 1VRMS)
(dB)
– 76.1
– 51.9
– 36.3
– 18.4
– 3.0
– 0.2
– 74.2
– 53.2
– 36.9
– 19.6
– 5.2
– 0.7
OUTPUT FREQUENCY
(Aliased Frequency
fOUT = ABS [fCLK ± fIN])
(kHz)
10.0
5.0
4.0
3.0
2.0
0.5
3.0
2.5
2.0
1.5
1.0
0.5
10% tr
RISE
TIME
(tr)
=
0.39
fCUTOFF
±
5%
SETTLING
(TO 1% of
TIME (ts)
OUTPUT)
=
2.2
fCUTOFF
±5%
TIME DELAY (td) = GROUP
(TO 50% OF OUTPUT)
DELAY
≈
1.2
fCUTOFF
Figure 6.
1164-7 F06
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 LTC1164-7 case
at 100:1, an input signal whose frequency is in the range
of fCLK ±3%, will be aliased back into the filter’s passband.
VS = ±7.5V
fCLK = 1MHz
fC = 20kHz
(fCLK/fC) = 50:1
5µs/DIV
1164-7 F07
Figure 7. Eye Diagram
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 LTC1164-7.PDF ] | |
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