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PDF LTC1063CJ8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1063CJ8 | |
| Descripción | DC Accurate/ Clock-Tunable 5th Order Butterworth Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Clock-Tunable Cutoff Frequency
s 1mV DC Offset (Typical)
s 80dB CMRR (Typical)
s Internal or External Clock
s 50µVRMS Clock Feedthrough
s 100:1 Clock-to-Cutoff Frequency Ratio
s 95µVRMS Total Wideband Noise
s 0.01% THD at 2VRMS Output Level
s 50kHz Maximum Cutoff Frequency
s Cascadable for Faster Roll-Off
s Operates from ±2.375 to ±8V Power Supplies
s Self-Clocking with 1 RC
APPLICATI S
s Audio
s Strain Gauge Amplifiers
s Anti-Aliasing Filters
s Low Level Filtering
s Digital Voltmeters
s 60Hz Lowpass Filters
s Smoothing Filters
s Reconstruction Filters
TYPICAL APPLICATI
2.5kHz 5th Order Lowpass Filter
VIN** 1
8
2
3 LTC1063
7
VOUT
6
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
LTC1063
DC Accurate, Clock-Tunable
5th Order Butterworth
Lowpass Filter
DESCRIPTIO
The LTC1063 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 SOL.
For a linear phase response, see LTC1065 data sheet.
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
1
Frequency Response
10
FREQUENCY (kHz)
100
1063 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1063
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
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
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
B
0.01 0.01 A 0.01
0.001
1
5
FREQUENCY (kHz)
10
1063 G10
A. fC = 10kHz, fCLK = 1MHz
B. fC = 20kHz, fCLK = 2MHz
0.001
0.1
1
INPUT (VRMS)
5
1063 G11
0.001
1
5
FREQUENCY (kHz)
10
1063 G12
Passband Gain and Phase
vs Input Frequency
1
±2.5V ≤ VS ≤ ±7.5V, TA = 25°C
0
0
– 20
–1
–2
AA
BB
PHASE
PHASE
–3
– 60
– 100
– 140
–4
–5
fCLK = 100kHz
fC =1kHz
fCLK = 1MHz
fC = 10kHz
– 180
– 220
–6
100
1k 10k
INPUT FREQUENCY (Hz)
– 260
100k
1063 G13
Phase Matching
1.2
1.1 VS = ± 7.5V
1.0
VIN = 1VRMS
fCLK = 2MHz
0.9 fC = 20kHz
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 2 4 6 8 10 12 14 16 18 20 22 24
INPUT FREQUENCY (kHz)
1063 G14
Power Supply Current vs
Power Supply Voltage
10
9
– 40°C
8
7 25°C
6
85°C
5
4
3
2
1
0
0 2 4 6 8 10 12 14 16 18 20
TOTAL POWER SUPPLY VOLTAGE (V)
1063 G15
5
5 Page 
APPLICATI S I FOR ATIO
Group Delay
The group delay of the LTC1063 closely approximates the
delay of an ideal 5-pole Butterworth lowpass filter (Figure
11, Curve A). To linearize the group delay of the LTC1063
(Figure 11, Curve B), use an input resistor about six times
higher than the maximum value of RIN, shown in Table 1.
The passband response of the group delay corrected filter
approximates a 5-pole Bessel response while its transi-
tion band rolls off like a Butterworth.
LTC1063
100
90
(A) LTC1063
80 BUTTERWORTH
70
60 (B) GROUP
DELAY
50 CORRECTED
40
30
20
0 1 2 3 4 5 6 7 8 9 10
INPUT FREQUENCY (kHz)
1063 F10
Figure 11. Group Delay
TYPICAL APPLICATI S
Single 5V Supply Operation (fC = 3.4kHz)
1µF +
TANT
5V
4.99k
4.53k
VIN 1
2
0.1µF
3
4
LTC1063
8
7
VOUT
6
5V
5 0.1µF
13k 200pF
1063 TA03
Cascading Two LTC1063s for Steeper Roll-Off
VIN* 1
2
8
7
LTC1063
36
–5V 4
5
5V
0.1µF
RC
0.1µF
18
27
VOUT
LTC1063
36
– 5V
0.1µF
4
5
fC ≅ (1/RC)(1/100)
WIDEBAND NOISE = 140µVRMS
ATTENUATION AT f = 2fC = 60dB
* IF THE INPUT VOLTAGE CAN EXCEED V+,
CONNECT A SIGNAL DIODE BETWEEN PIN 1 AND V+.
5V
0.1µF
1063 TA04
V–
–7.5V
+
1µF
TANT
Adjusting VOS(OUT) for
±7.5 Supply Operation
7.5V
10k
1
VIN
2
8
7
3 LTC1063 6
45
0.1µF
* OPTIONAL, 1N4148
10k
LT1009
≅2.5mV
VOUT
V+
7.5V
fCLK
0.1µF
*
1063 TA07
Sharing Clock for Multichannel Applications
VIN* 1
2
3
LTC1063
8
7 VOUT
6
–5V 4
5
5V
0.1µF
RC
0.1µF
– 5V
0.1µF
1
VIN*
2
3
4
LTC1063
8
7
6
5
VOUT
5V
0.1µF
* IF THE INPUT VOLTAGE CAN EXCEED V+,
CONNECT A SIGNAL DIODE BETWEEN PIN 1 AND V+. 1063 TA05
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 LTC1063CJ8.PDF ] | |
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