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PDF C1068 Data sheet ( Hoja de datos )

Número de pieza C1068
Descripción LTC1068
Fabricantes Linear Technology 
Logotipo Linear Technology Logotipo



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No Preview Available ! C1068 Hoja de datos, Descripción, Manual

LTC1068 Series
Clock-Tunable, Quad
Second Order, Filter Building Blocks
FEATURES
s Four Identical 2nd Order Filter Sections in an
SSOP Package
s 2nd Order Section Center Frequency Error:
±0.3% Typical and ±0.8% Maximum
s Low Noise per 2nd Order Section, Q 5:
www.DataSheetL4UT.Cco1m068-200 50µVRMS, LTC1068 50µVRMS
LTC1068-50 75µVRMS, LTC1068-25 90µVRMS
s Low Power Supply Current: 4.5mA, Single 5V,
LTC1068-50
s Operation with ±5V Power Supply, Single 5V
Supply or Single 3.3V Supply
APPLICATI S
s Lowpass or Highpass Filters:
LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to
50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25,
4Hz to 200kHz
s 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
DESCRIPTIO
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
FilterCADTM 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FilterCAD is a trademark of Linear Technology Corporation.
Windows is a registered trademark of Microsoft Corporation.
TYPICAL APPLICATI
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
5V
R13 20k
VIN2
R21 14k
R31 20k
0.1µF
R33 20k
R23 14k
1
INV B
INV C
2
HPB/NB HPC/NC
3
BPB
BPC
4
LPB
LPC
5
SB
SC
6
LTC1068-25
NC V
7
AGND
NC
8 V+
CLK
9
NC
NC
10
SA
SD
11
LPA
LPD
12
BPA
BPD
13
HPA/NA HPD/ND
14
INVA
INVD
28
27
26
25
24
23
22
21
20
19
18
17
16
15
R22 20k
R32 10k
1µF
R34 10k
R24 20k
R14 14k
1068 TA20a
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 TA20b
1

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C1068 pdf
ELECTRICAL CHARACTERISTICS
LTC1068-50 (Complete Filter) VS = ±5V, TA = 25°V, unless otherwise noted.
PARAMETER
fO Temperature Coefficient
Q Temperature Coefficient
DC Offset Voltage (Note 5)
(See Table 1)
www.DataSheet4U.com
Clock Feedthrough
Max Clock Frequency (Note 6)
Power Supply Current
CONDITIONS
VS = ±5V, fCLK = 500kHz, VOS1
(DC Offset of Input Inverter)
VS = ±5V, fCLK = 500kHz, VOS2
(DC Offset of First Integrator)
VS = ±5V, fCLK = 500kHz, VOS3
(DC Offset of Second Integrator)
VS = ±5V, fCLK = 500kHz
VS = ±5V, Q 1.6, Mode 1
VS = 3.14V, fCLK = 250kHz (Note 2)
VS = 4.75V, fCLK = 250kHz (Note 3)
VS = ±5V, fCLK = 500kHz
LTC1068 Series
MIN
q
q
q
q
q
q
TYP MAX UNITS
±1 ppm/°C
±5 ppm/°C
0 ±15 mV
– 2 ±25 mV
– 5 ±40 mV
0.16 mVRMS
3.4 MHz
3.0 5 mA
4.3 8 mA
6.0 11 mA
LTC1068-25 (Internal Op Amps) VS = ±5V, TA = 25°V, unless otherwise noted.
PARAMETER
Operating Supply Voltage Range
Voltage Swings
Output Short-Circuit Current (Source/Sink)
DC Open-Loop Gain
GBW Product
Slew Rate
Analog Ground Voltage (Note 4)
CONDITIONS
VS = 3.14V, RL = 5k (Note 2)
VS = 4.75V, RL = 5k (Note 3)
VS = ±5V, RL = 5k
VS = ±4.75V
VS = ±5V
RL = 5k
VS = ±5V
VS = ±5V
VS = 5V, Voltage at AGND
MIN TYP MAX UNITS
3.14 ±5.5 V
q 1.2
q 2.6
q ±3.4
1.6
3.4
±4.1
VP-P
VP-P
V
17/6
20/15
mA
mA
85 dB
6 MHz
10 V/µs
2.5V ±2%
V
LTC1068-25 (Complete Filter) VS = ±5V, TA = 25°V, unless otherwise noted.
PARAMETER
Clock-to-Center Frequency Ratio (Note 5)
Clock-to-Center Frequency Ratio,
Side-to-Side Matching (Note 5)
Q Accuracy (Note 5)
fO Temperature Coefficient
Q Temperature Coefficient
CONDITIONS
VS = 4.75V, fCLK = 500kHz, Mode 1 (Note 3),
fO = 20kHz, Q = 5, VIN = 0.5VRMS,
R1 = R3 = 49.9k, R2 = 10k
VS = ±5V, fCLK = 1MHz, Mode 1,
fO = 40kHz, Q = 5, VIN = 1VRMS,
R1 = R3 = 49.9k, R2 = 10K
VS = 4.75V, fCLK = 500kHz, Q = 5 (Note 3)
VS = ±5V, fCLK = 1MHz, Q = 5
VS = 4.75V, fCLK = 500kHz, Q = 5 (Note 3)
VS = ±5V, fCLK = 1MHz, Q = 5
MIN
q
q
q
q
q
q
TYP
25 ±0.3
25 ±0.3
±0.25
±0.25
±1
±1
±1
±5
MAX
25 ±0.8
25 ±0.9
UNITS
%
%
25 ±0.8
25 ±0.9
%
%
±0.9 %
±0.9 %
±3 %
±3 %
ppm/°C
ppm/°C
5

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C1068 arduino
WU
MODES OF OPERATION
Linear Technology’s universal switched-capacitor filters
are designed for a fixed internal, nominal fCLK/fO ratio. The
fCLK/fO ratio is 100 for the LTC1068, 200 for the LTC1068-
200, 50 for the LTC1068-50 and 25 for the LTC1068-25.
Filter designs often require the fCLK/fO ratio of each section
to be different from the nominal ratio and in most cases
different from each other. Ratios other than the nominal
value are possible with external resistors. Operating modes
use external resistors, connected in different arrange-
www.DataSheet4U.com
ments to realize different fCLK/fO ratios. By choosing the
proper mode, the fCLK/fO ratio can be increased or de-
creased from the part’s nominal ratio.
The choice of operating mode also effects the transfer
function at the HP/N pins. The LP and BP pins always give
the lowpass and bandpass transfer functions respectively,
regardless of the mode utilized. The HP/N pins have a
different transfer function depending on the mode used.
Mode 1 yields a notch transfer function. Mode 3 yields a
highpass transfer function. Mode 2 yields a highpass
notch transfer function (i.e., a highpass with a stopband
notch). More complex transfer functions, such as lowpass
notch, allpass or complex zeros, are achieved by summing
two or more of the LP, BP or HP/N outputs. This is
illustrated in sections Mode 2n and Mode 3a.
Choosing the proper mode(s) for a particular application
is not trivial and involves much more than just adjusting
the fCLK/fO ratio. Listed here are four of the nearly twenty
modes available. To make the design process simpler and
quicker, Linear Technology has developed the FilterCAD
for Widows design software. FilterCAD is an easy-to-use,
powerful and interactive filter design program. The de-
signer can enter a few filter specifications and the program
produces a full schematic. FilterCAD allows the designer to
concentrate on the filter’s transfer function and not get
bogged down in the details of the design. Alternatively,
those who have experience with the Linear Technology
family of parts can control all of the details themselves. For
a complete listing of all the operating modes, consult the
appendices of the FilterCAD manual or the Help files in
FilterCAD. FilterCAD can be obtained free of charge on the
Linear Technology web site (www.linear-tech.com) or you
can order the FilterCAD CD-ROM by contacting Linear
Technology Marketing.
LTC1068 Series
Mode 1
In Mode 1, the ratio of the external clock frequency to the
center frequency of each 2nd order section is internally
fixed at the part’s nominal ratio. Figure 4 illustrates Mode
1 providing 2nd order notch, lowpass and bandpass
outputs. Mode 1 can be used to make high order Butter-
worth lowpass filters; it can also be used to make low Q
notches and for cascading 2nd order bandpass functions
tuned at the same center frequency. Mode 1 is faster than
Mode 3.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
CC
R1
VIN
R3
R2
+
NS
BP LP
+
Σ
AGND
fO = RfACTLKIO; fn = fO
Q
=
R3 ;
R2
HON
=
RR21 ;
HOBP
=
R3
R1
HOLP = HON
DEVICE
RATIO
LTC1068
LTC1068-200
LTC1068-50
LTC1068-25
100
200
50
25
1068 F04
Figure 4. Mode 1, 2nd Order Filter Providing Notch,
Bandpass and Lowpass Outputs
Mode 1b
Mode 1b is derived from Mode 1. In Mode 1b (Figure 5)
two additional resistors R5 and R6 are added to lower the
amount of voltage fed back from the lowpass output into
the input of the SA (or SB) switched-capacitor summer.
This allows the filter’s clock-to-center frequency ratio to
be adjusted beyond the part’s nominal ratio. Mode 1b
maintains the speed advantages of Mode 1 and should be
considered an optimum mode for high Q designs with fCLK
to fCUTOFF (or fCENTER) ratios greater than the part’s
nominal ratio.
The parallel combination of R5 and R6 should be kept
below 5k.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
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