LTC1064
Low Noise, Fast, Quad
Universal Filter Building Block
FEATURES
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
Four Filters in a 0.3 Inch Wide Package
Maximum Center Frequency: 140kHz
Customized Version with Internal Resistors
Available
One Half the Noise of the LTC1059/LTC1060/
LTC1061 Devices
Maximum Clock Frequency: 7MHz
Clock-to-Center Frequency Ratio of 50:1 and 100:1
Simultaneously Available
Power Supplies:
±2.375V
to
±8V
Low Offsets
Low Harmonic Distortion
Available in 24-Pin DIP and SO Wide Packages
The LTC
®
1064 consists of four high speed, low noise
switched-capacitor filter building blocks. Each filter build-
ing block, together with an external clock and three to five
resistors can provide various 2nd order functions like
lowpass, highpass, bandpass and notch. The center fre-
quency of each 2nd order function can be tuned with an
external clock, or a clock and resistor ratio. For Q
≤
5, the
center frequency range is from 0.1Hz to 100kHz. For Q
≤
3, the center frequency range can be extended to 140kHz.
Up to 8th order filters can be realized by cascading all four
2nd order sections. Any classical filter realization (such as
Butterworth, Cauer, Bessel and Chebyshev) can be formed.
A customized monolithic version of the LTC1064 includ-
ing internal thin film resistors can be obtained for high
volume applications. Consult LTC Marketing for details.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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Anti-Aliasing Filters
Wide Frequency Range Tracking Filters
Spectral Analysis
Loop Filters
TYPICAL APPLICATIO
Clock-Tunable 8th Order Cauer Lowpass Filter with f
CUTOFF
up to 100kHz
13k
66.5k
22.1k
V
IN
10k
18.25k
10.7k
1
2
3
4
5
6
8V
0.1µF
10k
49.9K
11.5K
(FROM
R
H2
, R
L2
)
7
8
9
10
11
12
24
23
22
21
20
–8V
0.1µF
5MHz
8V
41.2k
12.7k
14k
121k
10k
FOR f
CLK
= 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1
C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12
WIDEBAND NOISE
≅
140µV
RMS
1064 TA01
R
H2
102k
PIN 12
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
BPA
HPA/NA
INV A
LTC1064
INV C
HPC/NC
BPC
LPC
SC
V
10k
12.1k
17.4k
R
L2
26.7k
–15
–30
GAIN (dB)
–45
–60
–75
–90
–
19
CLK
18
17
16
15
14
13
50/100
LPD
BPD
HPD
INV D
V
OUT
–105
–120
–135
1k
10k
100k
INPUT FREQUENCY (Hz)
1M
1064 TA02
U
Gain vs Frequency
0
f
CLK
= 5MHz
RIPPLE =
±0.1dB
f
CLK
= 1MHz
RIPPLE =
±0.05dB
1064fb
U
U
1
LTC1064
ABSOLUTE
AXI U RATI GS
(Note 1)
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Total Supply Voltage (V
+
to V
–
) ............................. 16V
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1064AC/LTC1064C .................... – 40°C to 85°C
LTC1064AM
LTC1064M
(OBSOLETE)
............... – 55°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
1
2
3
4
5
6
7
8
9
24 INV C
23 HPC/NC
22 BPC
21 LPC
20 SC
19
V
–
18 CLK
17 50/100
16 LPD
15 BPD
14 HPD
13 INV D
ORDER PART
NUMBER
LTC1064ACN
LTC1064CN
BPA 10
HPA/NA 11
INV A 12
N PACKAGE
24-LEAD PLASTIC DIP
T
JMAX
= 110°C,
θ
JA
= 65°C/W
J PACKAGE 24-LEAD CERAMIC DIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W
LTC1064ACJ
LTC1064CJ
LTC1064AMJ
LTC1064MJ
OBSOLETE PACKAGE
Consider the 24-Lead N Package as an Alternate Source
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Internal Op Amps) The
●
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Operating Supply Voltage Range
Voltage Swings
Output Short-Circuit Current (Source/Sink)
DC Open-Loop Gain
GBW Product
Slew Rate
CONDITIONS
V
S
=
±5V,
R
L
= 5k
●
ELECTRICAL CHARACTERISTICS
V
S
=
±5V
V
S
=
±5V,
R
L
= 5k
V
S
=
±5V
V
S
=
±5V
2
U
U
W
W W
U
W
TOP VIEW
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
1
2
3
4
5
6
7
8
9
24 INV C
23 HPC/NC
22 BPC
21 LPC
20 SC
19 V
–
18 CLK
17 50/100
16 LPD
15 BPD
14 HPD
13 INV D
ORDER PART
NUMBER
LTC1064CSW
BPA 10
HPA/NA 11
INV A 12
SW PACKAGE
24-LEAD PLASTIC SO WIDE
T
JMAX
= 100°C,
θ
JA
= 85°C/ W
MIN
±2.375
±3.2
±3.1
TYP
±3.6
3
80
7
10
MAX
±8
UNITS
V
V
V
mA
dB
MHz
V/µs
1064fb
LTC1064
(Complete Filter) The
●
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at V
S
=
±5V,
T
A
= 25°C, TTL clock input level, unless otherwise specified.
PARAMETER
Center Frequency Range, f
O
Input Frequency Range
Clock-to-Center Frequency
Ratio, f
CLK
/f
O
CONDITIONS
V
S
=
±8V,
Q
≤
3
LTC1064
LTC1064A (Note 2)
f
CLK
= 1MHz, f
O
= 20kHz, Pin 17 High
Sides A, B, C: Mode 1,
R1 = R3 = 5k, R2 = 5k, Q = 10,
Sides D: Mode 3, R1 = R3 = 50k
R2 = R4 = 5k
Same as Above, Pin 17 Low, f
CLK
= 1MHz
f
O
= 10kHz
Sides A, B, C
Side D
f
CLK
= 1MHz
f
CLK
= 4MHz, f
O
= 80kHz, Pin 17 High
Sides A, B, C: Mode 1, V
S
=
±7.5V
R1 = R3 = 50k, R2 = 5k, Q = 5
Side D: Mode 3, R1 = R3 = 50k
R2 = R4 = 5k, f
CLK
= 4MHz
Same as Above, Pin 17 Low
f
CLK
= 4MHz, f
O
= 40kHz
Sides A, B, C: Mode 1, Q = 10
Side D: Mode 3, f
CLK
= 1MHz
Mode 1, 50:1, f
CLK
< 2MHz
Mode 1, 100:1, f
CLK
< 2MHz
Mode 3, f
CLK
< 2MHz
f
CLK
= 1MHz, 50:1 or 100:1
f
CLK
= 1MHz, 50:1 or 100:1
f
CLK
= 1MHz, 50:1 or 100:1
f
CLK
< 1MHz
Mode 1, Q < 5, V
S
≥
±5V
MIN
TYP
0.1 to 140
0 to 1
50
±
0.3
MAX
UNITS
kHz
MHz
%
%
%
%
100
±
0.8
100
±
0.9
0.4
●
ELECTRICAL CHARACTERISTICS
●
●
50
±
0.8
50
±
0.9
LTC1064
LTC1064A (Note 2)
100
±
0.3
●
●
%
%
%
%
%
Clock-to-Center Frequency
Ratio, Side-to-Side Matching
Clock-to-Center Frequency
Ratio, f
CLK
/f
O
(Note 3)
LTC1064
LTC1064A (Note 2)
LTC1064
LTC1064A (Note 2)
1
50
±
0.6
50
±
1.3
LTC1064
LTC1064 A (Note 2)
Q Accuracy
f
O
Temperature Coefficient
Q Temperature Coefficient
DC Offset Voltage
V
OS1
(Table 1)
V
OS2
(Table 1)
V
OS3
(Table 1)
100
±
0.6
●
●
●
●
●
Clock Feedthrough
Maximum Clock Frequency
Power Supply Current
9
●
±2
±3
±1
±5
±5
2
3
3
0.2
7
12
100
±
1.3
6
8
15
45
45
23
26
%
%
%
%
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
RMS
MHz
mA
mA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Contact LTC Marketing.
Note 3:
Not tested, guaranteed by design.
Table 1. Output DC Offsets, One 2nd Order Section
MODE
1
1b
2
3
V
OSN
PINS 2, 11, 14, 23
V
OS1
[(1/Q) + 1 +
⏐
H
OLP
⏐
] – V
OS3
/Q
⏐
⏐
V
OS1
[(1/Q) + 1 + (R2/R1)] – V
OS3
/Q
V
OS1
[(1 + (R2/R1) + (R2/R3) + (R2/R4) – V
OS3
(R2/R3)]
×
[R4/(R2 + R4)] + V
OS2
[R2/(R2 + R4)]
V
OS2
V
OSBP
PINS 3, 10, 15, 22
V
OS3
V
OS3
V
OS3
V
OS3
V
OSLP
PINS 4, 9, 16, 21
V
OSN
– V
OS2
~(V
OSN
– V
OS2
)[1 + (R5/R6)]
V
OSN
– V
OS2
V
OS1
[1 + (R4/R1) + (R4/R2) + (R4/R3)]
– V
OS2
(R4/R2) – V
OS3
(R4/R3)
1064fb
3
LTC1064
BLOCK DIAGRA
INV A
(12)
AGND
(6)
INV B
(1)
INV C
(24)
INV D
(13)
TYPICAL PERFORMANCE CHARACTERISTICS
Mode 1, (f
CLK
/f
O
) = 50:1
20
T
A
= 25°C
Q=5
Q = 10
Q ERROR (%)
Q ERROR (%)
Q ERROR (%)
15
10
5
0
–5
T
A
= 25°C
Q = 5 OR 10
V
S
=
±2.5V
V
S
=
±5V
V
S
=
±7.5V
CENTER FREQUENCY
ERROR (%)
CENTER FREQUENCY
ERROR (%)
1.5
1.0
0.5
0
V
S
=
±2.5V
V
S
=
±5V
1.5
0.5
0
V
S
=
±5V
CENTER FREQUENCY
ERROR (%)
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G01
4
U W
W
HPA/NA
(11)
BPA
(10)
LPA
(9)
V
+
(7)
–
+
HPB/NB
(2)
+
Σ
–
+
∫
BPB
(3)
+
∫
LPB
(4)
50/100 (17)
CLK (18)
V
–
(19)
–
+
HPC/NC
(23)
SA
(8)
+
Σ
–
SB
(5)
+
∫
BPC
(22)
+
∫
LPC
(21)
BY TYING PIN 17 TO V
+
, ALL SECTIONS
OPERATE WITH (f
CLK
/f
O
) = 50:1
BY TYING PIN 17 TO V
–
, ALL SECTIONS
OPERATE WITH (f
CLK
/f
O
) = 100:1
LPD
(16)
BY TYING PIN 17 TO AGND, SECTIONS B, C
OPERATE WITH (f
CLK
/f
O
) = 50:1 AND
SECTIONS A, D OPERATE AT 100:1
–
+
HPD
(14)
+
Σ
–
SC
(20)
+
∫
BPD
(15)
+
∫
–
+
+
∫
+
∫
1064 BD
Mode 1, (f
CLK
/f
O
) = 100:1
20
15
10
5
0
–5
V
S
=
±7.5V
Mode 2, (f
CLK
/f
O
) = 25:1
20
15
10
5
0
–5
V
S
=
±2.5V
C
C
= 15pF
T
A
= 25°C
Q = 10
PIN 17 AT V
+
(R2/R4) = 3
V
S
=
±5V
C
C
= 15pF
T
A
= 25°C
Q=5
Q = 10
V
S
=
±5V
V
S
=
±7.5V
V
S
=
±2.5V
T
A
= 25°C
Q = 5 OR 10
1.0 V
S
=
±2.5V
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G03
V
S
=
±7.5V
V
S
=
±2.5V
V
S
=
±5V
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G02
1064fb
LTC1064
TYPICAL PERFORMANCE CHARACTERISTICS
Mode 2, (f
CLK
/f
O
) = 25:1
20
T
A
= 25°C
V
S
=
±7.5V
PIN 17 AT V
+
(R2/R4) = 3
Q=5
C
C
= 22pF
Q=2
C
C
= 39pF
Q ERROR (%)
Q ERROR (%)
15
10
5
0
–5
Q ERROR (%)
CENTER FREQUENCY
ERROR (%)
1.0
0.5
0
Q=5
Q=2
1.0
0.5
0
CENTER FREQUENCY
ERROR (%)
1.5
CENTER FREQUENCY
ERROR (%)
0 20 40 60 80 100 120140160180 200
CENTER FREQUENCY (kHz)
1064 G04
Mode 3, (f
CLK
/f
O
) = 50:1
20
Q ERROR (%)
15
10
5
0
–5
CENTER FREQUENCY
ERROR (%)
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100 110 120
CENTER FREQUENCY (kHz)
1064 G07
Q ERROR (%)
15
10
5
0
–5
V
S
=
±5V
V
S
=
±7.5V
V
S
=
±5V
V
S
=
±7.5V
WIDEBAND NOISE (µV/
RMS
)
T
A
= 25°C
C
C
= 15pF
R2 = R4
V
S
=
±7.5V
Q=2
Q=1
V
S
=
±7.5V
V
S
=
±2.5V
V
S
=
±5V
CENTER FREQUENCY
ERROR (%)
Power Supply Current vs
Supply Voltage
48
44
POWER SUPPLY CURRENT (mA)
40
36
32
28
24
20
16
12
8
4
0
0
2
4 6 8 10 12 14 16 18 20 22 24
POWER SUPPLY VOLTAGE (V
+
– V
–
)
1064 G10
1064 G11
U W
Mode 2, (f
CLK
/f
O
) = 50:1
20
15
10
5
0
–5
1.5
V
S
=
±5V
V
S
=
±2.5V
V
S
=
±7.5V
V
S
=
±2.5V
V
S
=
±5V
V
S
=
±7.5V
T
A
= 25°C
PIN 17 AT V
–
(R2/R4) = 3
Q=5
Q = 10
Mode 3, (f
CLK
/f
O
) = 50:1
T
A
= 25°C
C
C
= 5pF
R2 = R4
Q=5
Q = 10
V
S
=
±7.5V
20
15
10
5
0
–5
1.5
1.0
0.5
0
V
S
=
±5V
V
S
=
±2.5V
V
S
=
±2.5V
V
S
=
±5V
V
S
=
±7.5V
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G05
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G06
Mode 3, (f
CLK
/f
O
) = 100:1
240
Wideband Noise vs Q
T
A
= 25°C
C
C
= 5pF
R2 = R4
Q = 10
220
200
180
160
140
120
100
80
60
40
20
0
0
2
4
6
8 10 12 14 16 18 20 22 24
Q
1064 G09
20
V
S
=
±2.5V
ANY OUTPUT
R3 = R1
ONE SECOND ORDER
SECTION
MODE 1 OR 3
100:1 OR 50:1
±7.5V
±5V
±2.5V
V
S
=
±2.5V
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G08
Harmonic Distortion, 8th Order
LP Butterworth, f
C
= 20kHz,
THD = 0.015% for 3V
RMS
Input
–55°C
25°C
125°C
1064fb
5
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