LTC1064
Low Noise, Fast, Quad
Universal Filter Building Block
FEATURES
s
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DESCRIPTION
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.
The LTC1064 is manufactured using Linear Technology’s
enhanced LTCMOS
TM
silicon gate process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
s
s
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Four Filters in a 0.3-Inch Wide Package
One Half the Noise of the LTC1059/LTC1060/
LTC1061 Devices
Maximum Center Frequency: 140kHz
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
Customized Version with Internal Resistors
Available
APPLICATIONS
s
s
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Anti-Aliasing Filters
Wide Frequency Range Tracking Filters
Spectral Analysis
Loop Filters
TYPICAL APPLICATION
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
10k
12.1k
17.4k
R
L2
26.7k
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
0
–15
–30
GAIN (dB)
–45
–60
–75
–90
–105
–120
–135
1k
–
19
–8V
0.1µF
5MHz
8V
41.2k
12.7k
14k
121k
10k
V
OUT
CLK
18
17
16
15
14
13
50/100
LPD
BPD
HPD
INV D
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
U
U
U
Gain vs Frequency
f
CLK
= 5MHz
RIPPLE =
±0.1dB
f
CLK
= 1MHz
RIPPLE =
±0.05dB
10k
100k
INPUT FREQUENCY (Hz)
1M
1064 TA02
1
LTC1064
ABSOLUTE
MAXIMUM
RATINGS
Total Supply Voltage (V
+
to V
–
) ............................. 16V
Power Dissipation............................................. 500mW
Operating Temperature Range
LTC1064AC/LTC1064C.................... – 40°C to 85°C
LTC1064AM/LTC1064M ................ – 55°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
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
N PACKAGE
24-LEAD PLASTIC DIP
ORDER PART
NUMBER
LTC1064ACJ
LTC1064CJ
LTC1064AMJ
LTC1064MJ
LTC1064ACN
LTC1064CN
BPA 10
HPA/NA 11
INV A 12
J PACKAGE
24-LEAD CERAMIC DIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J)
T
JMAX
= 110°C,
θ
JA
= 65°C/ W (N)
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS
(Internal Op Amps) T
A
= 25°C, unless otherwise specified.
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
q
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
LTC1064CS
BPA 10
HPA/NA 11
INV A 12
SW PACKAGE
24-LEAD PLASTIC SO
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
LTC1064
ELECTRICAL CHARACTERISTICS
(Complete Filter) 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 1)
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
q
q
q
50
±
0.8
50
±
0.9
LTC1064
LTC1064A (Note 1)
100
±
0.3
q
q
%
%
%
%
%
Clock-to-Center Frequency
Ratio, Side-to-Side Matching
Clock-to-Center Frequency
Ratio, f
CLK
/f
O
(Note 2)
LTC1064
LTC1064A (Note 1)
LTC1064
LTC1064A (Note 1)
1
50
±
0.6
50
±
1.3
LTC1064
LTC1064 A (Note 1)
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
q
q
q
q
q
Clock Feedthrough
Maximum Clock Frequency
Power Supply Current
9
q
±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
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Contact LTC Marketing.
Note 2:
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)
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
Q ERROR (%)
T
A
= 25°C
Q=5
Q = 10
Q ERROR (%)
10
5
0
–5
V
S
=
±2.5V
10
5
0
–5
V
S
=
±2.5V
Q ERROR (%)
15
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 (%)
T
A
= 25°C
Q = 5 OR 10
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
V
S
=
±5V
V
S
=
±7.5V
T
A
= 25°C
Q=5
Q = 10
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
V
S
=
±7.5V
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
LTC1064
TYPICAL PERFORMANCE CHARACTERISTICS
Mode 2, (f
CLK
/f
O
) = 25:1
20
Q ERROR (%)
Q ERROR (%)
Q ERROR (%)
15
10
5
0
–5
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
CENTER FREQUENCY
ERROR (%)
1.5
1.0
0.5
0
0 20 40 60 80 100 120140160180 200
CENTER FREQUENCY (kHz)
1064 G04
CENTER FREQUENCY
ERROR (%)
CENTER FREQUENCY
ERROR (%)
Q=5
Q=2
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
U W
Mode 2, (f
CLK
/f
O
) = 50:1
20
15
10
5
0
–5
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100110 120
CENTER FREQUENCY (kHz)
1064 G05
Mode 3, (f
CLK
/f
O
) = 50:1
20
15
10
5
0
–5
T
A
= 25°C
C
C
= 5pF
R2 = R4
Q=5
Q = 10
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
V
S
=
±5V
V
S
=
±2.5V
V
S
=
±5V
V
S
=
±2.5V
V
S
=
±7.5V
1.5
1.0
0.5
0
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 G06
Mode 3, (f
CLK
/f
O
) = 100:1
240
20
T
A
= 25°C
C
C
= 5pF
R2 = R4
Q = 10
Wideband Noise vs Q
220
200
180
160
140
120
100
80
60
40
20
0
ANY OUTPUT
R3 = R1
ONE SECOND ORDER
SECTION
MODE 1 OR 3
100:1 OR 50:1
V
S
=
±2.5V
±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
0
2
4
6
8 10 12 14 16 18 20 22 24
Q
1064 G09
Harmonic Distortion, 8th Order
LP Butterworth, f
C
= 20kHz,
THD = 0.015% for 3V
RMS
Input
–55°C
25°C
125°C
1064 G11
5
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