1
LTC1060
1060fb
Universal Dual Filter
Building Block
DESCRIPTIO
U
APPLICATIO S
U
Guaranteed Filter Specification for ±2.37V and
±5V Supply
Operates Up to 30kHz
Low Power and 88dB Dynamic Range at ±2.5V Supply
Center Frequency Q Product Up to 1.6MHz
Guaranteed Offset Voltages
Guaranteed Clock-to-Center Frequency Accuracy Over
Temperature:
0.3% for LTC1060A
0.8% for LTC1060
Guaranteed Q Accuracy Over Temperature
Low Temperature Coefficient of Q and Center
Frequency
Low Crosstalk, 70dB
Clock Inputs TTL and CMOS Compatible
Single 5V Supply Medium Frequency Filters
Very High Q and High Dynamic Range Bandpass,
Notch Filters
Tracking Filters
Telecom Filters
Single 5V, Gain of 1000 4th Order Bandpass Filter
The LTC
®
1060 consists of two high performance, switched
capacitor filters. Each filter, together with 2 to 5 resistors,
can produce various 2nd order filter functions such as
lowpass, bandpass, highpass notch and allpass. The
center frequency of these functions can be tuned by an
external clock or by an external clock and resistor ratio. Up
to 4th order full biquadratic functions can be achieved by
cascading the two filter blocks. Any of the classical filter
configurations (like Butterworth, Chebyshev, Bessel, Cauer)
can be formed.
The LTC1060 operates with either a single or dual supply
from ±2.37V to ±8V. When used with low supply
(i.e. single 5V supply), the filter typically consumes 12mW
and can operate with center frequencies up to 10kHz. With
±5V supply, the frequency range extends to 30kHz and
very high Q values can also be obtained.
The LTC1060 is manufactured by using Linear
Technology's enhanced LTCMOSTM silicon gate process.
Because of this, low offsets, high dynamic range, high
center frequency Q product and excellent temperature
stability are obtained.
The LTC1060 is pinout compatible with MF10.
FEATURES
TYPICAL APPLICATIO
U
Amplitude Response
LTC1060 · TA01
V
IN
1mV(RMS)
0.1µF
3.16k
3.16k
100k
2k
100k
LTC1060
2k
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
5V
5V
OUTPUT
1k
1k
CLOCK IN
17.5kHz
INPUT FREQUENCY (Hz)
0
GAIN (dB)
30
50
275
LTC1060 · TA02
10
10
125
175
225
100
150
200
250
70
20
40
0
60
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS trademark of Linear Technology Corporation.
2
LTC1060
1060fb
ORDER PART
NUMBER
LTC1060ACN
LTC1060CN
LTC1060CSW
LTC1060ACJ
LTC1060MJ
LTC1060AMJ
LTC1060CJ
TOP VIEW
J PACKAGE
20-LEAD CERDIP
T
JMAX
= 150
°
C,
JA
= 70
°
C/W
T
JMAX
= 100
°
C,
JA
= 100
°
C/W (N)
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
LP
A
BP
A
N/AP/HP
A
INV
A
S1A
S
A/B
V
A
+
V
D
+
LSh
CLKA
LP
B
BP
B
N/AP/HP
B
INV
B
S1B
AGND
V
A
V
D
50/100/HOLD
CLKB
10
N PACKAGE
20-LEAD PDIP
SW PACKAGE
20-LEAD PLASTIC SO WIDE
T
JMAX
= 150
°
C,
JA
= 80
°
C/W (SW)
Supply Voltage ........................................................ 18V
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC1060AC/LTC1060C ................ 40°C T
A
85°C
LTC1060AM/LTC1060M ............ 55°C T
A
125°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)
OBSOLETE PACKAGE
Consider the N20 and SW20 Package for Alternate Source
ABSOLUTE AXI U RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
The
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Complete Filter) V
s
= ± 5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Center Frequency Range
f
0
· Q 400kHz, Mode 1, Figure 4
0.1 to 20k
Hz
(See Applications Information)
f
0
· Q 1.6MHz, Mode 1, Figure 4
0.1 to 16k
Hz
Clock-to-Center Frequency Ratio
LTC1060A
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
50 ± 0.3%
LTC1060
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
50 ± 0.8%
LTC1060A
Mode 1, 100:1, f
CLK
= 500kHz, Q = 10
100 ± 0.3%
LTC1060
Mode 1, 100:1, f
CLK
= 500kHz, Q = 10
100 ± 0.8%
Q Accuracy
LTC1060A
Mode 1, 50:1 or 100:1, f
0
= 5kHz, Q=10
±0.5
3
%
LTC1060
Mode 1, 50:1 or 100:1, f
0
= 5kHz, Q=10
±0.5
5
%
f
0
Temperature Coefficient
Mode 1, f
CLK
< 500kHz
10
ppm/°c
Q Temperature Coefficient
Mode 1, f
CLK
< 500kHz, Q = 10
20
ppm/°c
DC Offset V
OS1
2
15
mV
V
OS2
f
CLK
= 250kHz, 50:1, S
A/B
= High
3
40
mV
V
OS2
f
CLK
= 500kHz, 100:1, S
A/B
= High
6
80
mV
V
OS2
f
CLK
= 250kHz, 50:1, S
A/B
= Low
2
30
mV
V
OS2
f
CLK
= 500kHz, 100:1, S
A/B
= Low
4
60
mV
V
OS3
f
CLK
= 250kHz, 50:1, S
A/B
= Low
2
30
mV
V
OS3
f
CLK
= 500kHz, 100:1, S
A/B
= Low
4
60
mV
DC Lowpass Gain Accuracy
Mode 1, R1 = R2 = 50k
±0.1
2
%
BP Gain Accuracy at f
0
Mode 1, Q = 10, f
0
= 5kHz
±0.1
%
Clock Feedthrough
f
CLK
1MHz
10
mV
(P-P)
Max Clock Frequency
1.5
MHz
Power Supply Current
3
5
8
mA
12
mA
Crosstalk
70
dB
3
LTC1060
1060fb
The
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Complete Filter) V
S
= ±2.37V.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Center Frequency Range
f
0
· Q 100kHz
0.1 to 10k
Hz
Clock-to-Center Frequency Ratio
LTC1060A
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
50 ± 0.5%
LTC1060
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
50 ± 0.8%
LTC1060A
Mode 1, 100:1, f
CLK
= 250kHz, Q = 10
100 ± 0.5%
LTC1060
Mode 1, 100:1, f
CLK
= 250kHz, Q = 10
100 ± 0.8%
Q Accuracy
LTC1060A
Mode1, 50:1 or 100:1, f
0
= 2.5kHz, Q = 10
±2
%
LTC1060
Mode1, 50:1 or 100:1, f
0
= 2.5kHz, Q = 10
±4
%
Max Clock Frequency
500
kHz
Power Supply Current
2.5
4
mA
The
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
(Internal Op Amps).
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
±2.37
±8
V
Voltage Swings
LTC1060A
±4
±4
V
LTC01060
V
S
= ±5V, R
L
= 5k (Pins 1,2,19,20)
± 3.8
±4
V
LTC01060, LTC01060A
R
L
= 3.5k (Pins 3,18)
±3.6
±4
V
Output Short-Circuit Current
V
S
= ±5V
Source
25
mA
Sink
3
mA
Op Amp GBW Product
V
S
= ±5V
2
MHz
Op Amp Slew Rate
V
S
= ±5V
7
V/µs
Op Amp DC Open Loop Gain
R
L
= 10k, V
S
= ±5V
85
dB
AGND
TO AGND
INV
B
CLK
A
CLK
B
50/100/HOLD
LEVEL SHIFT
S
2A
S
2B
INVA
+
+
LTC1060 · BD01
+
+
LEVEL
SHIFT
NON-OVERLAP
CLOCK
LEVEL
SHIFT
NON-OVERLAP
CLOCK
CONTROL
17
11
9
12
10
15
4
V
D
+
V
A
+
BP
A
LP
A
N/AP/HP
A
S1A
8
7
3
5
2
1
V
D
V
A
14
13
19
20
18
BP
B
LP
B
N/AP/HP
B
S1B
16
S
AB
6
BLOCK DIAGRA
W
4
LTC1060
1060fb
Graph 1. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
Graph 2. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
Graph 3. Mode 1:
Q Error vs Clock Frequency
Graph 7. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
IDEAL Q
0.1
1.6
% DEVIATION (
f
CLK
/f
0
)
1.2
0.8
0.4
0
1
10
100
LT1060 · TPC01
2.0
2.4
0.4
V
S
= ±5V
T
A
= 25°C
f
CLK
= 250kHz
= 50 (TEST POINT)
f
CLK
f
0
IDEAL Q
0.1
0.3
% DEVIATION (
f
CLK
/f
0
)
0.2
0.1
0
0.1
1
10
100
LT1060 · TPC02
0.4
0.5
0.6
f
CLK
= 100 (TEST POINT)
f
CLK
f
0
V
S
= ±5V
T
A
= 25°C
f
CLK
= 500kHz
f
CLK
(MHz)
0.2
0
DEVIATION FROM IDEAL Q (%)
10
0
10
20
0.6
1.0 1.2
2.0
LTC1060 · TPC03
20
0.4
0.8
1.4 1.6 1.8
= 50:1
f
CLK
f
0
= 100:1
f
CLK
f
0
V
S
= ±2.5V
T
A
= 25°C
V
S
= ±2.5V
V
S
= ±5V
V
S
= ±5V
50 20
10
10
20
50
100
Q = 5
100
20 10
20
Q = 5
50
10 Q = 5
Q = 5
50
= 50:1
f
CLK
f
0
V
S
= ±5V
T
A
= 25°C
f
CLK
(MHz)
0
DEVIATION FROM 50:1 (%)
0.4
0.6
0.8
0.6
1.0
LTC1060 · TPC07
0.2
0
0.2
0.4
0.8
1.2
1.4
0.2
0.4
Q = 50
Q = 5
Q = 10
Q = 20
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Graph 4. Mode 1:
Q Error vs Clock Frequency
Graph 5. Mode 1: Measured Q vs
f
CLK
and Temperature
Graph 6. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
Graph 8. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
Graph 9. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
f
CLK
(MHz)
0.2
0
DEVIATION FROM IDEAL Q (%)
10
0
200
50
10
20
0.6
1.0 1.2
2.0
LTC1060 · TPC04
20
0.4
0.8
1.4 1.6 1.8
= 50:1
f
CLK
f
0
= 100:1
f
CLK
f
0
V
S
= ±7.5V
T
A
= 25°C
400
200
100
10
Q = 5
50
400
100
Q = 5
10
= 50:1
f
CLK
f
0
= 100:1
f
CLK
f
0
V
S
= ±5V
Q = 10
f
CLK
(MHz)
0.2
20
DEVIATION FROM IDEAL Q (%)
0
20
0
0.6
1.0
1.4
1.8
LTC1060 · TPC05
20
0.4
0.8
1.2
1.6
85°C
125°C
85°C
125°C
55°C
55°C
T
A
= 25°C
T
A
= 25°C
= 100:1
f
CLK
f
0
V
S
= ±5V
T
A
= 25°C
f
CLK
(MHz)
0
DEVIATION FROM 100:1 (%)
0.4
0.6
0.8
0.6
1.0
LTC1060 · TPC06
0.2
0
0.2
0.4
0.8
1.2
1.4
0.2
0.4
Q = 50
Q = 5
Q = 10
Q = 20
f
CLK
(MHz)
0.2
0.2
DEVIATION FROM 100:1 (%)
0
0.2
0.6
0.6
1.0
1.4
1.8
LTC1060 · TPC08
0.8
0.4
1.0
0.4
0.8
1.2
1.6
85°C
T
A
= 25°C
125°C
f
CLK
f
0
= 100:1
V
S
= ±5V
Q = 10
55°C
f
CLK
(MHz)
0.2
0.2
DEVIATION FROM 50:1 (%)
0
0.2
0.6
0.6
1.0
1.4
1.8
LTC1060 · TPC09
0.8
0.4
1.0
0.4
0.8
1.2
1.6
f
CLK
f
0
= 50:1
V
S
= ±5V
Q = 10
55°C
T
A
= 25°C
85°C
125°C
5
LTC1060
1060fb
Graph 10. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
Graph 11. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
Graph 12. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
Graph 13. Mode 1: (f
CLK
/f
0
) vs
f
CLK
and Temperature
Graph 14. Mode 1:
Notch Depth vs Clock Frequency
Graph 15. Mode 3: Deviation of
(f
CLK
/f
0
) with Respect to Q = 10
Measurement
Graph 16. Mode 3:
Q Error vs Clock Frequency
Graph 17. Mode 3 (R2 = R4):
Q Error vs Clock Frequency
Graph 18. Mode 3 (R2 = R4):
Measured Q vs f
CLK
and
Temperature
= 100:1
f
CLK
f
0
V
S
= ±2.5V
T
A
= 25°C
f
CLK
(MHz)
0
DEVIATION FROM 100:1 (%)
0.6
0.8
1.0
300
500
LTC1060 · TPC10
0.4
0.2
100
200
400
600
700
0
0.2
Q = 50
Q = 5
Q = 20
Q = 10
= 50:1
f
CLK
f
0
V
S
= ±2.5V
T
A
= 25°C
f
CLK
(MHz)
0
DEVIATION FROM 50:1 (%)
0.4
0.6
0.8
300
500
LTC1060 · TPC11
0.2
0
100
200
400
600
700
0.2
0.4
Q = 5
Q = 10
Q = 20
Q = 50
f
CLK
(kHz)
0
DEVIATION FROM 100:1 (%)
0
0.2
0.4
0.6
1
0.2
0.4
0.6
0.8
LTC1060 · TPC12
1.0
1.2
0.8
= 100:1
f
CLK
f
0
V
S
= ±2.5V
Q = 10
55°C
T
A
= 25°C
85°C
125°C
f
CLK
(kHz)
0
DEVIATION FROM 50:1 (%)
0
0.2
0.2
0.4
0.6
1.0
0.2
0.4
0.6
0.8
LTC1060 · TPC13
1.0
1.2
0.8
= 50:1
f
CLK
f
0
V
S
= ±2.5V
Q = 10
55°C
T
A
= 25°C
85°C
125°C
f
CLK
(MHz)
0
0
NOTCH DEPTH (dB)
20
40
60
80
0.4
0.8
1.2
1.6
LTC1060 · TPC14
100
120
0.2
0.6
1.0
1.4
V
S
= ±5V
T
A
= 25°C
V
IN
= 1V
RMS
Q = 10
100:1 Q = 1
100:1
Q = 10
50:1
IDEAL Q
(A)
(B)
0.1
0.2
Q = 10 MEASUREMENT (%)
DEVIATION OF
f
CLK
f
O
WITH RESPECT TO
0.1
0
0.1
1
10
100
LTC1060 · TPC15
0.3
0.4
0.5
= 500: 1
f
CLK
f
O
R2
=
R4
1
5
= 200: 1
f
CLK
f
O
R2
=
R4
1
2
V
S
= ±5V
T
A
= 25°C
PIN 12 AT 100:1
f
CLK
(MHz)
0.2
0
Q ERROR (%)
10
0
10
20
0.6
1.0 1.2
2.0
LTC1060 · TPC17
20
0.4
0.8
1.4 1.6 1.8
= 100:1
f
CLK
f
0
V
S
= ±7.5V
T
A
= 25°C
Q = 5
Q = 5
50
= 50:1
50
10
10
f
CLK
f
0
= 50:1
f
CLK
f
0
= 100:1
f
CLK
f
0
V
S
= ±5V
Q = 10
f
CLK
(MHz)
0.2
20
DEVIATION FROM IDEAL Q (%)
0
20
0
0.6
1.0
1.4
1.8
LTC1060 · TPC18
20
40
20
40
0.4
0.8
1.2
1.6
55°C
55°C
125°C
85°C
T
A
= 25°C
125°C
85°C
T
A
= 25°C
f
CLK
(MHz)
0.2
0
DEVIATION FROM IDEAL Q (%)
10
0
10
20
0.6
1.0 1.2
2.0
LTC1060 · TPC16
20
0.4
0.8
1.4 1.6 1.8
= 50:1
f
CLK
f
0
= 100:1
f
CLK
f
0
T
A
= 25°C
10
20
20
50
Q = 5
Q = 5
Q = 5
20
20
10
10
V
S
= ±2.5V
V
S
= ±5V
V
S
= ±2.5V
V
S
= ±5V
50
50
Q = 5
10
50
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
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