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Linear Technology Electronic Components Datasheet

C1068 Datasheet

Filter Building Blocks

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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


Linear Technology Electronic Components Datasheet

C1068 Datasheet

Filter Building Blocks

No Preview Available !

LTC1068 Series
ABSOLUTE AXI U RATI GS (Note 1)
Total Supply Voltage (V+ to V ) .............................. 12V
Power Dissipation............................................. 500mW
Input Voltage at Any Pin .... V – 0.3V VIN V + + 0.3V
Storage Temperature Range ................. – 65°C to 150°C
Operating Temperature Range
LTC1068C................................................ 0°C to 70°C
LTC1068I ........................................... – 40°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
www.DataSheet4U.com
INV B 1
HPB/NB 2
BPB 3
LPB 4
SB 5
NC 6
AGND 7
V+ 8
NC 9
SA 10
LPA 11
BPA 12
HPA/NA 13
INV A 14
TOP VIEW
28 INV C
27 HPC/NC
26 BPC
25 LPC
24 SC
23 V
22 NC
21 CLK
20 NC
19 SD
18 LPD
17 BPD
16 HPD/ND
15 INV D
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 110°C, θJA = 95°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1068CG
LTC1068CG-200
LTC1068CG-50
LTC1068CG-25
LTC1068IG
LTC1068IG-200
LTC1068IG-50
LTC1068IG-25
TOP VIEW
INV B 1
HPB/NB 2
BPB 3
LPB 4
SB 5
AGND 6
V+ 7
SA 8
LPA 9
BPA 10
HPA/NA 11
INV A 12
24 INV C
23 HPC/NC
22 BPC
21 LPC
20 SC
19 V
18 CLK
17 SD
16 LPD
15 BPD
14 HPD/ND
13 INV D
N PACKAGE
24-LEAD PDIP
TJMAX = 110°C, θJA = 65°C/W
ORDER PART
NUMBER
LTC1068CN
LTC1068IN
ELECTRICAL CHARACTERISTICS LTC1068 (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
3.2
±4.1
VP-P
VP-P
V
17/6
20/15
mA
mA
85 dB
6 MHz
10 V/µs
2.5V ±2%
V
2


Part Number C1068
Description Filter Building Blocks
Maker Linear Technology
Total Page 28 Pages
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