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PDF LTC1064 Data sheet ( Hoja de datos )
| Número de pieza | LTC1064 | |
| Descripción | Low Noise/ Fast/ Quad Universal Filter Building Block | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1064
Low Noise, Fast, Quad
Universal Filter Building Block
FEATURES
DESCRIPTIO
■ Four Filters in a 0.3 Inch Wide Package
■ Maximum Center Frequency: 140kHz
■ Customized Version with Internal Resistors
Available
■ One Half the Noise of the LTC1059/LTC1060/
LTC1061 Devices
■ Maximum Clock Frequency: 7MHz
■ Clock-to-Center Frequency Ratio of 50:1 and 100:1
Simultaneously Available
■ Power Supplies: ±2.375V to ±8V
■ Low Offsets
■ Low Harmonic Distortion
■ Available in 24-Pin DIP and SO Wide Packages
U
APPLICATIO S
■ Anti-Aliasing Filters
■ Wide Frequency Range Tracking Filters
■ Spectral Analysis
■ Loop Filters
The LTC®1064 consists of four high speed, low noise
switched-capacitor filter building blocks. Each filter build-
ing block, together with an external clock and three to five
resistors can provide various 2nd order functions like
lowpass, highpass, bandpass and notch. The center fre-
quency of each 2nd order function can be tuned with an
external clock, or a clock and resistor ratio. For Q ≤ 5, the
center frequency range is from 0.1Hz to 100kHz. For Q ≤
3, the center frequency range can be extended to 140kHz.
Up to 8th order filters can be realized by cascading all four
2nd order sections. Any classical filter realization (such as
Butterworth, Cauer, Bessel and Chebyshev) can be formed.
A customized monolithic version of the LTC1064 includ-
ing internal thin film resistors can be obtained for high
volume applications. Consult LTC Marketing for details.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Clock-Tunable 8th Order Cauer Lowpass Filter with fCUTOFF up to 100kHz
13k
22.1k
VIN
10k
18.25k
10.7k
8V
(FROM
RH2, RL2)
0.1µF
10k
49.9K
11.5K
66.5k
1 INV B
INV C 24
2 HPB/NB HPC/NC 23
3 BPB
BPC 22
4 LPB
LPC 21
5 SB
SC 20
6 AGND
V– 19
7 V+ LTC1064 CLK 18
8 SA
50/100 17
9 LPA
LPD 16
10 BPA
BPD 15
11 HPA/NA
HPD 14
12 INV A
INV D 13
10k
12.1k
17.4k
5MHz
8V
41.2k
12.7k
14k
121k
RH2
102k
RL2
26.7k
0.1µF
PIN 12
– 8V
VOUT
10k
FOR fCLK = 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1
C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12
WIDEBAND NOISE ≅ 140µVRMS
1064 TA01
Gain vs Frequency
0
–15
–30
–45 fCLK = 5MHz
–60 RIPPLE = ±0.1dB
–75
–90
–105
fCLK = 1MHz
RIPPLE = ±0.05dB
–120
–135
1k
10k 100k
INPUT FREQUENCY (Hz)
1M
1064 TA02
1064fb
1
1 page  
LTC1064
TYPICAL PERFORMANCE CHARACTERISTICS
Mode 2, (fCLK/fO) = 25:1
Mode 2, (fCLK/fO) = 50:1
Mode 3, (fCLK/fO) = 50:1
TA = 25°C
20
VS = ±7.5V
PIN 17 AT V
+
15 (R2/R4) = 3
10
Q=5
5 CC = 22pF
0
–5
Q=2
CC = 39pF
1.5
1.0
Q=5
Q=2
0.5
0
0 20 40 60 80 100120140160180 200
CENTER FREQUENCY (kHz)
1064 G04
Mode 3, (fCLK/fO) = 50:1
TA = 25°C
20
CC = 15pF
R2 = R4
15 VS = ±7.5V
10
5
0
–5
Q=2
Q=1
1.5
1.0 VS = ±2.5V
0.5
VS = ±7.5V
VS = ±5V
0
0 10 20 30 40 50 60 70 80 90 100 110 120
CENTER FREQUENCY (kHz)
1064 G07
20
15
VS = ±2.5V
VS = ±5V
10
5 VS = ±7.5V
0
–5
TA = 25°C
PIN 17 AT
V–
(R2/R4) = 3
Q=5
Q = 10
1.5 VS = ±5V
1.0
0.5
VS = ±2.5V
VS = ±7.5V
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G05
Mode 3, (fCLK/fO) = 100:1
20
15 VS = ±2.5V VS = ±5V
TA = 25°C
CC = 5pF
R2 = R4
Q = 10
10
5 VS = ±7.5V
0
–5
VS = ±2.5V
1.5
1.0
VS = ±5V
VS = ±7.5V
0.5
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G08
20
15 VS = ±5V
10 VS = ±2.5V
TA = 25°C
CC = 5pF
R2 = R4
Q=5
Q = 10
5 VS = ±7.5V
0
–5
1.5
1.0 VS = ±2.5V
0.5
VS = ±5V VS = ±7.5V
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
Wideband Noise vs Q
1064 G06
240
220 ANY OUTPUT
200
R3 = R1
ONE SECOND ORDER
180 SECTION
160 MODE 1 OR 3
100:1 OR 50:1
140
120
±7.5V
±5V
±2.5V
100
80
60
40
20
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Q
1064 G09
Power Supply Current vs
Supply Voltage
48
44
40
36
32
28
24
– 55°C
20 25°C
16 125°C
12
8
4
0
0 2 4 6 8 10 12 14 16 18 20 22 24
POWER SUPPLY VOLTAGE (V+ – V–)
1064 G10
Harmonic Distortion, 8th Order
LP Butterworth, fC = 20kHz,
THD = 0.015% for 3VRMS Input
1064 G11
1064fb
5
5 Page 
TYPICAL APPLICATIO S
Wideband Bandpass: Ratio of High to Low Corner Frequency Equal to 2
R14
R23
R33
R43
5V TO 8V
R11
VIN
C1
0.1µF
R41
R31
R21
R13
1 INV B
INV C 24
2 HPB/NB HPC/NC 23
3 BPB
BPC 22
4 LPB
LPC 21
5 SB
SC 20
6 AGND
V– 19
7 V+ LTC1064 CLK 18
8 SA
50/100 17
9 LPA
LPD 16
10 BPA
BPD 15
11 HPA/NA
HPD 14
12 INV A
INV D 13
R24
R34
R44
fCLK ≤ 7MHz
R42
R32
R22
R12
VOUT
–5V TO –8V
0.1µF
C2
RESISTOR VALUES:
R11 = 16k R21 = 16k R31 = 7.32k
R12 = 10k R22 = 10k R32 = 22.6k
R13 = 23.2k R23 = 13.3k R33 = 21.5k
R14 = 6.8k R24 = 20k R34 = 15.4k
R41 = 10k
R42 = 13.3k
R43 = 10k
R44 = 32.4k
NOTE: FOR fCLK ≥ 3MHz, USE C1 = C2 = 22pF
1064 TA03
LTC1064
Amplitude Response
15
0
fCLK = 7MHz
–15
–30
–45
fCLK = 2MHz
–60
–75
–90
VS = ±8V
–105
10k
100k
INPUT FREQUENCY (Hz)
1M
1064 TA04
Quad Bandpass Filter with Center Frequency Equal to fO, 2fO, 3fO and 4fO
R12
VIN1
5V TO 8V
R11
VIN3
R22
R32
0.1µF
R31
R21
10.5k
1 INV B
2 HPB/NB
3 BPB
4 LPB
INV C 24
HPC/NC 23
BPC 22
LPC 21
R23
R33
R43
5 SB
SC 20
6 AGND
V– 19
7 V+ LTC1064 CLK 18 fCLK
8 SA
50/100 17
9 LPA
LPD 16
R44
10 BPA
BPD 15
R34
11 HPA/NA
HPD 14
R24
12 INV A
INV D 13
17.4k
20k
20k
R13
VIN2
–5V TO –8V
0.1µF
R14
VIN4
RESISTOR VALUES:
R11 = 249k R21 = 10k
R12 = 249k R22 = 10k
R13 = 499k R23 = 10k
R14 = 453k R24 = 10k
R31 = 249k
R32 = 249k
R33 = 174k
R34 = 249k
R43 = 17.8k
R44 = 40.2k
20k
–
LT1056
+
Amplitude Response
5
fCLK = 2MHz
0
–5
–10
–15
–20
–25
–30
–35
–40
0
10 20 30 40
INPUT FREQUENCY (kHz)
50
1064 TA06
VOUT
1064 TA05
1064fb
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC1064.PDF ] | |
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