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PDF LTC1063 Data sheet ( Hoja de datos )
| Número de pieza | LTC1063 | |
| Descripción | DC Accurate/ Clock-Tunable 5th Order Butterworth Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1063
DC Accurate, Clock-Tunable
5th Order Butterworth
Lowpass Filter
FEATURES
■ Clock-Tunable Cutoff Frequency
■ 1mV DC Offset (Typical)
■ 80dB CMRR (Typical)
■ Internal or External Clock
■ 50µVRMS Clock Feedthrough
■ 100:1 Clock-to-Cutoff Frequency Ratio
■ 95µVRMS Total Wideband Noise
■ 0.01% THD at 2VRMS Output Level
■ 50kHz Maximum Cutoff Frequency
■ Cascadable for Faster Roll-Off
■ Operates from ±2.375 to ±8V Power Supplies
■ Self-Clocking with 1 RC
■ Available in 8-Pin DIP and 16-Pin SO Wide Packages
U
APPLICATIO S
■ Audio
■ Strain Gauge Amplifiers
■ Anti-Aliasing Filters
■ Low Level Filtering
■ Digital Voltmeters
■ 60Hz Lowpass Filters
■ Smoothing Filters
■ Reconstruction Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
The LTC®1063 is the first monolithic filter providing both
clock-tunability, low DC output offset and over 12-bit DC
accuracy. The frequency response of the LTC1063 closely
approximates a 5th order Butterworth polynomial. With
appropriate PCB layout techniques the output DC offset is
typically 1mV and is constant over a wide range of clock
frequencies. With ±5V supplies and ±4V input voltage
range, the CMR of the device is 80dB.
The filter cutoff frequency is controlled either by an inter-
nal or external clock. The clock-to-cutoff frequency ratio is
100:1. The on-board clock is power supply independent,
and it is programmed via an external RC. The 50µVRMS
clock feedthrough is considerably reduced over existing
monolithic filters.
The LTC1063 wideband noise is 95µVRMS, and it can
process large AC input signals with low distortion. With
±7.5V supplies, for instance, the filter handles up to
4VRMS (92dB S/N ratio) while the standard 1kHz THD is
below 0.02%; 80dB dynamic ranges (S/N +THD) is ob-
tained with input levels between 1VRMS and 2.3VRMS.
The LTC1063 is available in 8-pin miniDIP and 16-pin SO
wide packages. For a linear phase response, see LTC1065
data sheet.
TYPICAL APPLICATIO
2.5kHz 5th Order Lowpass Filter
VIN** 1
8
27
VOUT
LTC1063
36
5V
–5V 4
5 0.1µF
0.1µF *19.1k
200pF*
* SELF-CLOCKING SCHEME
** IF THE INPUT VOLTAGE CAN EXCEED V+,
CONNECT A SIGNAL DIODE BETWEEN PIN 1 AND V+.
1063 TA01
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
1
Frequency Response
10
FREQUENCY (kHz)
100
1063 TA02
1063fa
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1063
Gain vs Frequency; VS = ±2.5V
10
0
–10
– 20
– 30
A BC
– 40
–50 A. fCLK = 0.5MHz
– 60
B. fCLK = 1MHz
C. fCLK = 2MHz
– 70
– 80
VIN = 750mVRMS
TA = 25°C
– 90
1 10
INPUT FREQUENCY (kHz)
100 200
1063 G04
THD + Noise vs Input Voltage;
VS = Single 5V
1
fIN = 1kHz, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
B
A
0.01
A. fC = 5kHz, fCLK = 0.5MHz
B. fC = 10kHz, fCLK = 1MHz
0.001
0.1
1
INPUT (VRMS)
5
1063 G07
THD vs Frequency; VS = ±5V
1
VIN = 1.5VRMS
fC = 10kHz, fCLK = 1MHz
S/N = 83.5dB, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
Gain vs Frequency; VS = ±5V
10
0
–10
– 20
– 30
– 40
– 50
A. fCLK = 1MHz
B. fCLK = 2MHz
–60 C. fCLK = 3MHz
D. fCLK = 4MHz
– 70
A BC
– 80
VIN = 1.5VRMS
TA = 25°C
– 90
1
10
INPUT FREQUENCY (kHz)
D
100 200
1063 G05
THD vs Frequency;
VS = Single 5V
1
VIN = 0.75VRMS
fC = 5kHz, fCLK = 500kHz
S/N = 78dB, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
0.01
0.001
1
23
FREQUENCY (kHz)
45
1063 G08
THD + Noise vs Input Voltage;
VS = ±7.5V
1
fIN = 1kHz, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
Gain vs Frequency; VS = ±7.5V
10
0
D
–10
A BC
E
– 20
– 30
– 40
A. fCLK = 1MHz
B. fCLK = 2MHz
–50 C. fCLK = 3MHz
D. fCLK = 4MHz
–60 E. fCLK = 5MHz
– 70
– 80
VIN = 2.5VRMS
TA = 25°C
– 90
1
10
INPUT FREQUENCY (kHz)
100 200
1063 G06
THD + Noise vs Input Voltage;
VS = ±5V
1
fIN = 1kHz, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
B
A
0.01
A. fC = 10kHz, fCLK = 1MHz
B. fC = 20kHz, fCLK = 2MHz
0.001
0.1
1
INPUT (VRMS)
THD vs Frequency;
VS = ±7.5V
1
VIN = 2.5VRMS
fC = 10kHz, fCLK = 1MHz
S/N = 88dB, TA = 25°C
5 REPRESENTATIVE UNITS
0.1
5
1063 G09
0.01
0.001
1
5
FREQUENCY (kHz)
10
1063 G10
B
0.01 A
A. fC = 10kHz, fCLK = 1MHz
B. fC = 20kHz, fCLK = 2MHz
0.001
0.1
1
INPUT (VRMS)
5
1063 G11
0.01
0.001
1
5
FREQUENCY (kHz)
10
1063 G12
1063fa
5
5 Page 
LTC1063
APPLICATIO S I FOR ATIO
noise ratio at a given distortion level. The wideband noise
(µVRMS) is nearly independent of the value of the clock
frequency and excludes the clock feedthrough. The
LTC1063’s typical wideband noise is 95µVRMS. Figure 9
shows the same scope photo as Figure 8 but with a more
sensitive vertical scale: The clock feedthrough is imbed-
ded in the filter’s wideband noise. The peak-to-peak
wideband noise of the filter can be clearly seen; it is
approximately 500µVP-P. Note that 500µVP-P equals the
95µVRMS wideband noise of the part, multiplied by a crest
factor or 5.25.
Aliasing
Aliasing is an inherent phenomenon of sampled data filters
and it primarily occurs when the frequency of an input
signal approaches the sampling frequency. For the
LTC1063, an input signal whose frequency is in the range
of fCLK ±6% will generate an alias signal into the filter’s
passband and stopband. Table 4 shows details.
Example: LTC1063, fCLK = 20kHz, fC = 200kHz,
fIN = (19.6kHz, 100mVRMS)
fALIAS = (400Hz, 3.16mVRMS)
An input RC can be used to attenuate incoming signals
close to the filter clock frequency (Figure 10). A Butterworth
passband response will be maintained if the value of the
input resistor follows Table 1.
2µs/DIV
fCLK = 100kHz, fC = 1kHz, VS = ±5V, 1MHz SCOPE BW
1063 F08
Figure 8. LTC1063 Output Clock Feedthrough + Noise
2µs/DIV
fCLK = 100kHz, fC = 1kHz, VS = ±5V, 1MHz SCOPE BW
1063 F09
Figure 9. LTC1063 Output Clock Feedthrough + Noise
Table 4. Aliasing Data
INPUT FREQUENCY
0.9995fCLK
0.995 fCLK
0.99 fCLK
0.9875fCLK
0.985 fCLK
0.9825fCLK
0.98 fCLK
0.975 fCLK
0.97 fCLK
0.965 fCLK
0.96 fCLK
0.955 fCLK
0.95 fCLK
0.94 fCLK
0.93 fCLK
0.9 fCLK
OUTPUT FREQUENCY
0.0005 fCLK
0.005 fCLK
0.01 fCLK
0.0125 fCLK
0.015 fCLK
0.0175 fCLK
0.02 fCLK
0.025 fCLK
0.03 fCLK
0.035 fCLK
0.04 fCLK
0.045 fCLK
0.05 fCLK
0.06 fCLK
0.07 fCLK
0.1 fCLK
OUTPUT AMPLITUDE
REFERENCED TO
INPUT SIGNAL
0 dB
0 dB
– 3 dB
– 10.2 dB
– 17.7 dB
– 24.3 dB
– 30 dB
– 40 dB
– 48 dB
– 54.5 dB
– 60.4 dB
– 65.5 dB
– 70.16 dB
– 78.25 dB
– 85.3 dB
– 100.3 dB
R
VIN
C
V–
0.1µF
18
2
7
VOUT
LTC1063
36
4 5 fCLK
V+
0.1µF
fCLK
20
≤
1
2πRC
≤
fCLK
10
1063 F10
Figure 10. Adding an Input Anti-Aliasing RC
1063fa
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1063.PDF ] | |
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