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PDF LTC1065CS Data sheet ( Hoja de datos )
| Número de pieza | LTC1065CS | |
| Descripción | DC Accurate/ Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Clock-Tunable Cutoff Frequency
s 1mV DC Offset (Typical)
s 80dB CMR (Typical)
s Internal or External Clock
s 50µVRMS Clock Feedthrough
s 100:1 Clock-to-Cutoff Frequency Ratio
s 80µVRMS Total Wideband Noise
s 0.004% Noise + 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 Smoothing Filters
s Reconstruction Filters
TYPICAL APPLICATI
3.4kHz Single 5V Supply Bessel Lowpass Filter
5V
4.99k
+ 1µF 4.53k
TANT
VIN 1
2
0.1µF 3
4
LTC1065
8
7
VOUT
6 5V
5 0.1µF
* SELF-CLOCKING SCHEME
13k*
200pF*
1065 TA01
LTC1065
DC Accurate, Clock-Tunable
Linear Phase 5th Order Bessel
Lowpass Filter
DESCRIPTIO
The LTC1065 is the first monolithic filter providing both
clock-tunability with low DC output offset and over 12-bit
DC accuracy. The frequency response of the LTC1065
closely approximates a 5th order Bessel 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 typically 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 nearly power supply inde-
pendent and it is programmed via an external RC. The
50µVRMS clock feedthrough of the device is considerably
lower than other existing monolithic filters.
The LTC1065 wideband noise is 80µVRMS and it can
process large AC input signals with low distortion. With
± 7.5V supplies, for instance, the filter handles up to
4VRMS (94dB S/N ratio) while the standard 1kHz THD is
below 0.005%; 87dB dynamic range (S/N + THD) is ob-
tained with input levels between 2VRMS and 2.5VRMS.
The LTC1065 is available in 8-pin miniDIP and 16-pin SOL.
For a Butterworth response, see LTC1063 data sheet. The
LTC1065 is pin compatible with the LTC1063.
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
1
Frequency Response
10
FREQUENCY (kHz)
100
1065 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
THD + Noise vs Input Voltage;
VS = Single 5V, AGND = 2V
1
fIN = 1kHz, TA = 25°C
0.1
THD vs Frequency;
VS = Single 5V, AGND = 2V
1
VIN = 0.75VRMS, S/N = 80dB
fC = 5kHz, fCLK = 500kHz
TA = 25°C
0.1
B
0.01 A
A. fC = 5kHz, fCLK = 0.5MHz
B. fC = 10kHz, fCLK = 1MHz
0.001
0.1
1
INPUT (VRMS)
5
1065 G07
THD vs Frequency; VS = ±5V
1
VIN = 1.5VRMS
fC = 10kHz, fCLK = 1MHz
TA = 25°C
0.1
0.01
0.001
1
23
FREQUENCY (kHz)
45
1065 G08
THD + Noise vs Input Voltage;
VS = ±7.5V
1
fIN = 1kHz
TA = 25°C
0.1
LTC1065
THD + Noise vs Input Voltage;
VS = ±5V
1
fIN = 1kHz, TA = 25°C
0.1
B
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, S/N = 90dB
fC = 10kHz, fCLK = 1MHz
TA = 25°C
0.1
A
5
1065 G09
B
0.01 0.01
0.01
A
0.001
1
5
FREQUENCY (kHz)
10
1065 G10
A. fC = 10kHz, fCLK = 1MHz
B. fC = 20kHz, fCLK = 2MHz
0.001
0.1
1
INPUT (VRMS)
5
1065 G11
0.001
1
5
FREQUENCY (kHz)
10
1065 G12
Passband Gain and Phase
vs Input Frequency
1
±2.5V ≤ VS ≤ ±7.5V, TA = 25°C
0
40
0
–1
–2
AA
BB
PHASE
PHASE
–3
–40
–80
– 120
–4 fC=1kHz
fCLK = 100kHz
–5
fC=10kHz –160
fCLK = 1MHz
– 200
Typical Phase Matching
Device to Device
0.6
VS = ± 7.5V
0.5
VIN = 1VRMS
fC = 20kHz
fCLK = 2MHz
0.4
0.3
0.2
0.1
Power Supply Current vs
Power Supply Voltage
15
12
9
6
– 40°C
25°C
85°C
3
–6
100
1k 10k
INPUT FREQUENCY (Hz)
– 240
100k
1065 G13
0
0 2 4 6 8 10 12 14 16 18 20 22 24
INPUT FREQUENCY (kHz)
1065 G14
0
0 2 4 6 8 10 12 14 16 18 20
TOTAL POWER SUPPLY VOLTAGE (V)
1065 G15
5
5 Page 
APPLICATI S I FOR ATIO
Table 4. Aliasing Data
INPUT FREQUENCY
0.9995 fCLK
0.995 fCLK
0.99 fCLK
0.9875 fCLK
0.985 fCLK
0.9825 fCLK
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
– 0.01 dB
– 0.98 dB
– 3.13 dB
– 4.79 dB
– 7.21 dB
– 10.43 dB
– 14.14 dB
– 21.84 dB
– 28.98 dB
– 35.31 dB
– 40.94 dB
– 45.96 dB
– 50.46 dB
– 58.29 dB
– 64.90 dB
– 80.20 dB
LTC1065
An input RC can be used to attenuate incoming signals
close to the filter clock frequency (Figure 10). A Bessel
passband response will be maintained if the value of the
input resistor follows Table 1.
R
VIN
V–
1
C2
3
0.1µF 4
LTC1065
8
7
VOUT
6
5 fCLK
fCLK
20
≤
1
2πRC
≤
fCLK
10
V+
0.1µF
1065 F10
Figure 10. Adding an Input Anti-Aliasing RC
TYPICAL APPLICATI S
Cascading Two LTC1065s for Steeper Roll-Off
VIN 1
8
27
LTC1065
–5V 3 6
0.1µF
4
5
5V
0.1µF
RC
18
27
VOUT
LTC1065
–5V 3 6
0.1µF
4
5
fC ≅ (1/RC)(1/100)
WIDEBAND NOISE = 110µVRMS
ATTENUATION AT f = 2fC = 60dB
5V
0.1µF
1065 TA04
Sharing Clock for Multichannel Applications
VIN 1
8
2 7 VOUT
3 LTC1065 6
– 5V
0.1µF 4
5
5V
0.1µF
RC
1
VIN
8
2 7 VOUT
–5V 3 LTC1065 6 5V
0.1µF 4 5 0.1µF
1065 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 LTC1065CS.PDF ] | |
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