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Part Number LTC1068

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1
LTC1068 Series
Clock-Tunable, Quad
Second Order, Filter Building Blocks
S
FEATURE
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:
LTC1068-200 50
µ
V
RMS
, LTC1068 50
µ
V
RMS
LTC1068-50 75
µ
V
RMS
, LTC1068-25 90
µ
V
RMS
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
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
TM
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.
D
U
ESCRIPTIO
FilterCAD is a trademark of Linear Technology Corporation.
Windows is a registered trademark of Microsoft Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
S
A
O
PPLICATI
U
A
O
PPLICATI
TYPICAL
Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable
Up to 200kHz f ­ 3dB = f
CLK
/25, 4th Order Filter Noise = 60
µ
V
RMS
INV B
HPB/NB
BPB
LPB
SB
NC
AGND
V
+
NC
SA
LPA
BPA
HPA/NA
INVA
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
INV C
HPC/NC
BPC
LPC
SC
V
­
NC
CLK
NC
SD
LPD
BPD
HPD/ND
INVD
LTC1068-25
R31 20k
R33 20k
R23 14k
R13 20k
0.1
µ
F
R21 14k
R22 20k
R12 14k
R32 10k
R34 10k
R24 20k
R14 14k
R11 20k
V
IN1
V
IN2
5V
1
µ
F
V
OUT1
V
OUT2
1068 TA20a
­ 5V
f
CLK
= (25)(f ­ 3dB)
RELATIVE FREQUENCY [f
IN
/(f ­ 3dB)]
0.1
GAIN (dB)
­10
­ 20
­ 30
­ 40
­ 50
­ 60
­ 70
­ 80
1
10
1068 TA20b
10
0
Gain vs Frequency
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
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2
LTC1068 Series
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Total Supply Voltage (V
+
to V
­
) .............................. 12V
Power Dissipation ............................................. 500mW
Input Voltage at Any Pin .... V
­
­ 0.3V
V
IN
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
INV B
HPB/NB
BPB
LPB
SB
NC
AGND
V
+
NC
SA
LPA
BPA
HPA/NA
INV A
INV C
HPC/NC
BPC
LPC
SC
V
­
NC
CLK
NC
SD
LPD
BPD
HPD/ND
INV D
Consult factory for Military grade parts.
T
JMAX
= 110
°
C,
JA
= 95
°
C/W
LTC1068CN
LTC1068IN
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
BPA
HPA/NA
INV A
INV C
HPC/NC
BPC
LPC
SC
V
­
CLK
SD
LPD
BPD
HPD/ND
INV D
N PACKAGE
24-LEAD PDIP
T
JMAX
= 110
°
C,
JA
= 65
°
C/W
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1068CG
LTC1068CG-200
LTC1068CG-50
LTC1068CG-25
LTC1068IG
LTC1068IG-200
LTC1068IG-50
LTC1068IG-25
W
U
U
PACKAGE/ORDER I FOR ATIO
ELECTRICAL CHARACTERISTICS
LTC1068 (Internal Op Amps) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage Range
3.14
±
5.5
V
Voltage Swings
V
S
= 3.14V, R
L
= 5k (Note 2)
q
1.2
1.6
V
P-P
V
S
= 4.75V, R
L
= 5k (Note 3)
q
2.6
3.2
V
P-P
V
S
=
±
5V, R
L
= 5k
q
±
3.4
±
4.1
V
Output Short-Circuit Current (Source/Sink)
V
S
=
±
4.75V
17/6
mA
V
S
=
±
5V
20/15
mA
DC Open-Loop Gain
R
L
= 5k
85
dB
GBW Product
V
S
=
±
5V
6
MHz
Slew Rate
V
S
=
±
5V
10
V/
µ
s
Analog Ground Voltage (Note 4)
V
S
= 5V, Voltage at AGND
2.5V
±
2%
V
(Note 1)
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3
LTC1068 Series
ELECTRICAL CHARACTERISTICS
LTC1068 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock-to-Center Frequency Ratio
(Note 5)
V
S
= 4.75V, f
CLK
= 1MHz, Mode 1 (Note 3),
100
±
0.3
100
±
0.8
%
f
O
= 10kHz, Q = 5, V
IN
= 0.5V
RMS
,
q
100
±
0.9
%
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±
5V, f
CLK
= 1MHz, Mode 1,
100
±
0.3
100
±
0.8
%
f
O
= 10kHz, Q = 5, V
IN
= 1V
RMS
,
q
100
±
0.9
%
R1 = R3 = 49.9k, R2 = 10K
Clock-to-Center Frequency Ratio,
V
S
= 4.75V, f
CLK
= 1MHz, Q = 5 (Note 3)
q
±
0.25
±
0.9
%
Side-to-Side Matching (Note 5)
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
0.25
±
0.9
%
Q Accuracy (Note 5)
V
S
= 4.75V, f
CLK
= 1MHz, Q = 5 (Note 3)
q
±
1
±
3
%
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
1
±
3
%
f
O
Temperature Coefficient
±
1
ppm/
°
C
Q Temperature Coefficient
±
5
ppm/
°
C
DC Offset Voltage (Note 5)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS1
q
0
±
15
mV
(See Table 1)
(DC Offset of Input Inverter)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS2
q
±
2
±
25
mV
(DC Offset of First Integrator)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS3
q
±
5
±
40
mV
(DC Offset of Second Integrator)
Clock Feedthrough
V
S
=
±
5V, f
CLK
= 1MHz
0.1
mV
RMS
Max Clock Frequency (Note 6)
V
S
=
±
5V, Q
2.0, Mode 1
5.6
MHz
Power Supply Current
V
S
= 3.14V, f
CLK
= 1MHz (Note 2)
q
3.5
8
mA
V
S
= 4.75V, f
CLK
= 1MHz (Note 3)
q
6.5
11
mA
V
S
=
±
5V, f
CLK
= 1MHz
q
9.5
15
mA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock-to-Center Frequency Ratio
(Note 5)
V
S
= 4.75V, f
CLK
= 1MHz, Mode 1 (Note 3),
200
±
0.3
200
±
0.8
%
f
O
= 5kHz, Q = 5, V
IN
= 0.5V
RMS
,
q
200
±
0.9
%
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±
5V, f
CLK
= 1MHz, Mode 1,
200
±
0.3
200
±
0.8
%
f
O
= 5Hz, Q = 5, V
IN
= 1V
RMS
,
q
200
±
0.9
%
R1 = R3 = 49.9k, R2 = 10K
LTC1068-200 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage Range
3.14
±
5.5
V
Voltage Swings
V
S
= 3.14V, R
L
= 5k (Note 2)
q
1.2
1.6
V
P-P
V
S
= 4.75V, R
L
= 5k (Note 3)
q
2.6
3.2
V
P-P
V
S
=
±
5V, R
L
= 5k
q
±
3.4
±
4.1
V
Output Short-Circuit Current (Source/Sink)
V
S
=
±
4.75V
17/6
mA
V
S
=
±
5V
20/15
mA
DC Open-Loop Gain
R
L
= 5k
85
dB
GBW Product
V
S
=
±
5V
6
MHz
Slew Rate
V
S
=
±
5V
10
V/
µ
s
Analog Ground Voltage (Note 4)
V
S
= 5V, Voltage at AGND
2.5V
±
2%
V
LTC1068-200 (Internal Op Amps) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
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4
LTC1068 Series
ELECTRICAL CHARACTERISTICS
LTC1068-200 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V
,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock-to-Center Frequency Ratio,
V
S
= 4.75V, f
CLK
= 1MHz, Q = 5 (Note 3)
q
±
0.25
±
0.9
%
Side-to-Side Matching (Note 5)
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
0.25
±
0.9
%
Q Accuracy (Note 5)
V
S
= 4.75V, f
CLK
= 1MHz, Q = 5 (Note 3)
q
±
1
±
3
%
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
1
±
3
%
f
O
Temperature Coefficient
±
1
ppm/
°
C
Q Temperature Coefficient
±
5
ppm/
°
C
DC Offset Voltage (Note 5)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS1
q
0
±
15
mV
(See Table 1)
(DC Offset of Input Inverter)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS2
q
±
2
±
25
mV
(DC Offset of First Integrator)
V
S
=
±
5V, f
CLK
= 1MHz, V
OS3
q
±
5
±
40
mV
(DC Offset of Second Integrator)
Clock Feedthrough
V
S
=
±
5V, f
CLK
= 1MHz
0.1
mV
RMS
Max Clock Frequency (Note 6)
V
S
=
±
5V, Q
2.0, Mode 1
5.6
MHz
Power Supply Current
V
S
= 3.14V, f
CLK
= 1MHz (Note 2)
q
3.5
8
mA
V
S
= 4.75V, f
CLK
= 1MHz (Note 3)
q
6.5
11
mA
V
S
=
±
5V, f
CLK
= 1MHz
q
9.5
15
mA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock-to-Center Frequency Ratio
(Note 5)
V
S
= 3.14V, f
CLK
= 250kHz, Mode 1 (Note 2),
50
±
0.3
50
±
0.8
%
f
O
= 5kHz, Q = 5, V
IN
= 0.34V
RMS
,
q
50
±
0.9
%
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±
5V, f
CLK
= 500kHz, Mode 1,
50
±
0.3
50
±
0.8
%
f
O
= 10kHz, Q = 5, V
IN
= 1V
RMS
,
q
50
±
0.9
%
R1 = R3 = 49.9k, R2 = 10K
Clock-to-Center Frequency Ratio,
V
S
= 3.14V, f
CLK
= 250kHz, Q = 5 (Note 2)
q
±
0.25
±
0.9
%
Side-to-Side Matching (Note 5)
V
S
=
±
5V, f
CLK
= 500kHz, Q = 5
q
±
0.25
±
0.9
%
Q Accuracy (Note 5)
V
S
= 3.14V, f
CLK
= 250kHz, Q = 5 (Note 2)
q
±
1
±
3
%
V
S
=
±
5V, f
CLK
= 500kHz, Q = 5
q
±
1
±
3
%
LTC1068-50 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage Range
3.14
±
5.5
V
Voltage Swings
V
S
= 3.14V, R
L
= 5k (Note 2)
q
1.2
1.8
V
P-P
V
S
= 4.75V, R
L
= 5k (Note 3)
q
2.6
3.6
V
P-P
V
S
=
±
5V, R
L
= 5k
q
±
3.4
±
4.1
V
Output Short-Circuit Current (Source/Sink)
V
S
=
±
3.14V
17/6
mA
V
S
=
±
5V
20/15
mA
DC Open-Loop Gain
R
L
= 5k
85
dB
GBW Product
V
S
=
±
5V
4
MHz
Slew Rate
V
S
=
±
5V
7
V/
µ
s
Analog Ground Voltage (Note 4)
V
S
= 5V, Voltage at AGND
2.175V
±
2%
V
LTC1068-50 (Internal Op Amps) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
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5
LTC1068 Series
ELECTRICAL CHARACTERISTICS
LTC1068-50 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V
,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
f
O
Temperature Coefficient
±
1
ppm/
°
C
Q Temperature Coefficient
±
5
ppm/
°
C
DC Offset Voltage (Note 5)
V
S
=
±
5V, f
CLK
= 500kHz, V
OS1
q
0
±
15
mV
(See Table 1)
(DC Offset of Input Inverter)
V
S
=
±
5V, f
CLK
= 500kHz, V
OS2
q
­ 2
±
25
mV
(DC Offset of First Integrator)
V
S
=
±
5V, f
CLK
= 500kHz, V
OS3
q
­ 5
±
40
mV
(DC Offset of Second Integrator)
Clock Feedthrough
V
S
=
±
5V, f
CLK
= 500kHz
0.16
mV
RMS
Max Clock Frequency (Note 6)
V
S
=
±
5V, Q
1.6, Mode 1
3.4
MHz
Power Supply Current
V
S
= 3.14V, f
CLK
= 250kHz (Note 2)
q
3.0
5
mA
V
S
= 4.75V, f
CLK
= 250kHz (Note 3)
q
4.3
8
mA
V
S
=
±
5V, f
CLK
= 500kHz
q
6.0
11
mA
LTC1068-25 (Internal Op Amps) V
S
=
±
5V, T
A
= 25
°
V
,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage Range
3.14
±
5.5
V
Voltage Swings
V
S
= 3.14V, R
L
= 5k (Note 2)
q
1.2
1.6
V
P-P
V
S
= 4.75V, R
L
= 5k (Note 3)
q
2.6
3.4
V
P-P
V
S
=
±
5V, R
L
= 5k
q
±
3.4
±
4.1
V
Output Short-Circuit Current (Source/Sink)
V
S
=
±
4.75V
17/6
mA
V
S
=
±
5V
20/15
mA
DC Open-Loop Gain
R
L
= 5k
85
dB
GBW Product
V
S
=
±
5V
6
MHz
Slew Rate
V
S
=
±
5V
10
V/
µ
s
Analog Ground Voltage (Note 4)
V
S
= 5V, Voltage at AGND
2.5V
±
2%
V
LTC1068-25 (Complete Filter) V
S
=
±
5V, T
A
= 25
°
V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock-to-Center Frequency Ratio
(Note 5)
V
S
= 4.75V, f
CLK
= 500kHz, Mode 1 (Note 3),
25
±
0.3
25
±
0.8
%
f
O
= 20kHz, Q = 5, V
IN
= 0.5V
RMS
,
q
25
±
0.9
%
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±
5V, f
CLK
= 1MHz, Mode 1,
25
±
0.3
25
±
0.8
%
f
O
= 40kHz, Q = 5, V
IN
= 1V
RMS
,
q
25
±
0.9
%
R1 = R3 = 49.9k, R2 = 10K
Clock-to-Center Frequency Ratio,
V
S
= 4.75V, f
CLK
= 500kHz, Q = 5 (Note 3)
q
±
0.25
±
0.9
%
Side-to-Side Matching (Note 5)
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
0.25
±
0.9
%
Q Accuracy (Note 5)
V
S
= 4.75V, f
CLK
= 500kHz, Q = 5 (Note 3)
q
±
1
±
3
%
V
S
=
±
5V, f
CLK
= 1MHz, Q = 5
q
±
1
±
3
%
f
O
Temperature Coefficient
±
1
ppm/
°
C
Q Temperature Coefficient
±
5
ppm/
°
C