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LTC1068 fiches techniques PDF

Linear - Filter Building Blocks

Numéro de référence LTC1068
Description Filter Building Blocks
Fabricant Linear 
Logo Linear 





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LTC1068 fiche technique
LTC1068 Series
Clock-Tunable, Quad
Second Order, Filter Building Blocks
FEATURES
DESCRIPTION
n Four Identical 2nd Order Filter Sections in an
SSOP Package
n 2nd Order Section Center Frequency Error:
± 0.3% Typical and ±0.8% Maximum
n Low Noise per 2nd Order Section, Q ≤ 5:
LTC1068-200 50µVRMS, LTC1068 50µVRMS
LTC1068-50 75µVRMS, LTC1068-25 90µVRMS
n Low Power Supply Current: 4.5mA, Single 5V,
LTC1068-50
n Operation with ± 5V Power Supply, Single 5V
Supply or Single 3.3V Supply
APPLICATIONS
n Lowpass or Highpass Filters:
LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to
50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25,
4Hz to 200kHz
n Bandpass or Bandreject (Notch) Filters:
LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to
30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25,
4Hz to 140kHz
The LTC®1068 product family consists of four monolithic
clock-tunable filter building blocks. Each product contains
four matched, low noise, high accuracy 2nd order switched-
capacitor filter sections. An external clock tunes the center
frequency of each 2nd order filter section. The LTC1068
products differ only in their clock-to-center frequency
ratio. The clock-to-center frequency ratio is set to 200:1
(LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or
25:1 (LTC1068-25). External resistors can modify the clock-
to-center frequency ratio. High performance, quad 2nd
order, dual 4th order or 8th order filters can be designed
with an LTC1068 family product. Designing filters with an
LTC1068 product is fully supported by FilterCAD™ filter
design software for Windows.
The LTC1068 products are available in a 28-pin SSOP
surface mount package. A customized version of an
LTC1068 family product can be obtained in a 16-lead SO
package with internal thin-film resistors. Please contact
LTC Marketing for details.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
FilterCAD is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up
to 200kHz f – 3dB = fCLK/25, 4th Order Filter Noise = 60µVRMS
R12 14k
R11 20k
VIN1
R21 14k
R31 20k
1 INV B
2 HPB/NB
3 BPB
INV C 28
HPC/NC 27 R22 20k
BPC 26 R32 10k
4 LPB
LPC 25
5 SB
SC
6
LTC1068-25
NC
V
7 AGND
NC
24
23
22
1µF
5V
8 V+
CLK 21
0.1µF
9 NC
NC 20
10 SA
SD 19
R13 20k
VIN2
R33 20k
R23 14k
11 LPA
12 BPA
13 HPA/NA
14 INVA
LPD 18
BPD 17 R34 10k
HPD/ND 16 R24 20k
INVD 15
R14 14k
1068 TA01
VOUT1
–5V
fCLK = (25)(f – 3dB)
VOUT2
Gain vs Frequency
10
0
–10
–20
–30
–40
–50
–60
–70
–80
0.1
1 10
RELATIVE FREQUENCY [fIN/(f – 3dB)]
1068 TA02
1068fc
1

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