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PDF LTC1064-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC1064-4 | |
| Descripción | Low Noise/8th Order/ Clock Sweepable Cauer Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1064-4
Low Noise, 8th Order, Clock
Sweepable Cauer Lowpass Filter
FEATURES
■ 8th Order Filter in a 14-Pin Package
■ 80dB or More Stopband Attenuation at 2 × fCUTOFF
■ 50:1, fCLK to fCUTOFF Ratio (Cauer)
100:1, fCLK to f–3dB Ratio (Transitional)
■ 135µVRMS Total Wideband Noise
■ 0.03% THD or Better
■ 100kHz Maximum fCUTOFF Frequency
■ Operates up to ±8V Power Supplies
■ Input Frequency Range up to 50 Times the Filter
Cutoff Frequency
U
APPLICATIO S
■ Antialiasing Filters
■ Telecom Filters
■ Sinewave Generators
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
DESCRIPTIO
The LTC®1064-4 is an 8th order, clock sweepable Cauer
lowpass switched capacitor filter. An external TTL or
CMOS clock programs the value of the filter’s cutoff
frequency. With Pin 10 at V+, the fCLK to fCUTOFF ratio is
50:1; the filter has a Cauer response and with compensa-
tion the passband ripple is ±0.1dB. The stopband attenu-
ation is 80dB at 2 × fCUTOFF. Cutoff frequencies up to
100kHz can be achieved. With Pin 10 at V–, the fCLK to
f–3dB ratio is 100:1, the filter has a transitional Butterworth-
Cauer response with lower noise and lower delay
nonlinearity than the Cauer response. The stopband
attenuation at 2.5 × f–3dB is 92dB. Cutoff frequencies up to
50kHz can be achieved.
The LTC1064-4 features low noise and low harmonic
distortion even when input voltages up to 3VRMS are
applied. The LTC1064-4 overall performance competes
with equivalent multiple op amp active realizations. The
LTC1064-4 is pin compatible with the LTC1064-1,
LTC1064-2 and LTC1064-3.
The LTC1064-4 is manufactured using Linear Technology’s
enhanced LTCMOSTM silicon gate process.
TYPICAL APPLICATIO
8th Order Clock Sweepable Lowpass Elliptic Filter
VIN
8V
0.1µF
1 14
INV C R(h, I)
2
VIN
COMP2* 13
3
AGND
V– 12
4
LTC1064-4
V+ fCLK
11 CLOCK
(TTL, ≤5MHz)
5
AGND
50/100 10 V+/V–
6
COMP1*
7
INV A
9
VOUT
8
NC
VOUT
–8V
0.1µF
1064 TA01
* FOR FREQUENCIES ABOVE 20kHz AND MINIMUM PASSBAND RIPPLE REFER
TO THE PIN DESCRIPTION SECTION FOR COMPENSATION GUIDELINES.
NOTE:THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR
CLOSE TO THE PACKAGE. BYPASSING PIN 10 WITH 0.1µF CAPACITOR
REDUCES CLOCK FEEDTHROUGH. THE CONNECTION BETWEEN PINS 7
AND 14 SHOULD BE PHYSICALLY DONE UNDER THE PACKAGE.
Frequency Response
20
TA = 25°C
0
fCLK = 5MHz, 50:1
CCOMP1 = 30pF, CCOMP2 = 18pF
–20
–40
–60
fCLK = 2MHz, 50:1
–80
fCLK = 1MHz, 100:1
–100
1k 10k
100k
FREQUENCY (Hz)
1M
1064-4 TA01b
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1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Table 2. Gain/Phase, Pin 10 at V+, Typical Response
fCUTOFF = 1kHz, VS = ±5V, TA = 25°C, fCLK = 50kHz, Ratio = 50:1
FREQUENCY(kHz)
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
2.000
GAIN (dB)
– 0.075
– 0.050
0.020
0.060
0.090
– 15.640
– 34.700
– 51.700
– 68.600
– 84.110
PHASE (deg)
– 59.990
– 122.400
169.300
88.500
– 26.100
– 175.100
126.500
87.600
38.400
– 47.860
LTC1064-4
Table 3. Gain/Delay, Pin 10 at V+, Typical Response
fCUTOFF = 1kHz, VS = ±5V, TA = 25°C, fCLK = 50kHz, Ratio = 50:1
FREQUENCY(kHz)
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000
1.100
1.200
GAIN (dB)
– 0.074
– 0.070
– 0.050
– 0.020
0.020
0.050
0.060
0.120
0.090
– 5.020
– 15.650
DELAY (ms)
0.844
0.867
0.899
0.949
1.021
1.122
1.275
1.592
2.160
2.070
1.288
Table 4. Gain/Phase, Pin 10 at V–, Typical Response
f –3dB = 1kHz, VS = ±5V, TA = 25°C, fCLK = 100kHz, Ratio = 100:1
FREQUENCY(kHz)
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
2.000
GAIN (dB)
– 0.179
– 0.440
– 0.810
– 1.480
– 3.500
– 17.720
– 35.700
– 52.700
– 71.900
– 96.160
PHASE (deg)
– 60.090
– 122.000
170.800
91.900
– 16.300
– 140.500
164.800
135.000
114.000
– 49.670
Table 5. Gain/Delay, Pin 10 at V–, Typical Response
f –3dB = 1kHz, VS = ±5V, TA = 25°C, fCLK = 100kHz, Ratio = 100:1
FREQUENCY(kHz)
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000
1.100
1.200
GAIN (dB)
– 0.174
– 0.300
– 0.440
– 0.610
– 0.810
– 1.090
– 1.480
– 2.080
– 3.500
– 8.720
– 17.720
DELAY (ms)
0.842
0.861
0.888
0.933
0.999
1.095
1.242
1.503
1.832
1.724
1.183
Table 6. Gain/Phase, Pin 10 at GND
VS = ±5V, TA = 25°C
FREQUENCY(kHz)
0.200
0.400
0.600
0.800
1.000
1.200
1.400k
1.600
1.800
2.000
GAIN (dB)
– 0.383
– 1.000
– 1.300
– 0.280
2.670
– 3.500
– 12.510
– 20.000
– 27.300
– 35.000
PHASE (deg)
– 47.140
– 92.000
– 134.300
– 178.800
109.200
6.000
– 47.400
– 88.800
– 127.800
– 164.200
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LTC1064-4
PACKAGE DESCRIPTIO
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.030 ±.005
TYP
N
.050 BSC .045 ±.005
.398 – .413
(10.109 – 10.490)
NOTE 4
16 15 14 13 12 11 10
9
N
.420 .325 ±.005
MIN
NOTE 3
.394 – .419
(10.007 – 10.643)
123
N/2
RECOMMENDED SOLDER PAD LAYOUT
.005
(0.127)
RAD MIN
.291 – .299
(7.391 – 7.595)
NOTE 4
.010
(0.254
–
–
.029
0.737)
×
45°
0° – 8° TYP
N/2
123 45678
.093 – .104
(2.362 – 2.642)
.037 – .045
(0.940 – 1.143)
.050
.009 – .013
(0.229 – 0.330)
NOTE 3
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS
IN
INCHES
(MILLIMETERS)
(1.270)
BSC .014 – .019
(0.356 – 0.482)
TYP
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.004 – .012
(0.102 – 0.305)
S16 (WIDE) 0502
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.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1064-4.PDF ] | |
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