LTC1060
Universal Dual Filter
Building Block
FEATURES
■
■
■
■
■
■
DESCRIPTIO
■
■
■
■
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
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 LTCMOS™ 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS trademark of Linear Technology Corporation.
APPLICATIO S
■
■
■
■
Single 5V Supply Medium Frequency Filters
Very High Q and High Dynamic Range Bandpass,
Notch Filters
Tracking Filters
Telecom Filters
TYPICAL APPLICATIO
3.16k
1
100k
V
IN
1mV(RMS)
3.16k
2k
2
3
4
5
6
5V
7
8
9
10
CLOCK IN
17.5kHz
Single 5V, Gain of 1000 4th Order Bandpass Filter
70
20
19
18
17
16
LTC1060
15
14
13
12
11
1k
1k
100k
2k
5V
0.1µF
GAIN (dB)
OUTPUT
Amplitude Response
60
50
40
30
20
10
0
–10
0
100 125 150 175 200 225 250 275
INPUT FREQUENCY (Hz)
LTC1060 • TA02
LTC1060 • TA01
U
1060fb
U
U
1
LTC1060
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
LP
A
BP
A
N/AP/HP
A
INV
A
S1A
S
A/B
V
A
+
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
1
2
3
4
5
6
7
8
9
20 LP
B
19 BP
B
18 N/AP/HP
B
17 INV
B
16 S1B
15 AGND
14 V
A–
13 V
D–
12 50/100/HOLD
11 CLKB
ORDER PART
NUMBER
LTC1060ACN
LTC1060CN
LTC1060CSW
V
D+
LSh
CLKA 10
N PACKAGE
SW PACKAGE
20-LEAD PDIP
20-LEAD PLASTIC SO WIDE
T
JMAX
= 100°C,
θ
JA
= 100°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 80°C/W (SW)
J PACKAGE
20-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 70°C/W
OBSOLETE PACKAGE
Consider the N20 and SW20 Package for Alternate Source
LTC1060ACJ
LTC1060MJ
LTC1060AMJ
LTC1060CJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Center Frequency Range
(See Applications Information)
Clock-to-Center Frequency Ratio
LTC1060A
LTC1060
LTC1060A
LTC1060
Q Accuracy
LTC1060A
LTC1060
f
0
Temperature Coefficient
Q Temperature Coefficient
DC Offset V
OS1
V
OS2
V
OS2
V
OS2
V
OS2
V
OS3
V
OS3
DC Lowpass Gain Accuracy
BP Gain Accuracy at f
0
Clock Feedthrough
Max Clock Frequency
Power Supply Current
Crosstalk
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.
CONDITIONS
f
0
• Q
≤
400kHz, Mode 1, Figure 4
f
0
• Q
≤
1.6MHz, Mode 1, Figure 4
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 100:1, f
CLK
= 500kHz, Q = 10
Mode 1, 100:1, f
CLK
= 500kHz, Q = 10
Mode 1, 50:1 or 100:1, f
0
= 5kHz, Q=10
Mode 1, 50:1 or 100:1, f
0
= 5kHz, Q=10
Mode 1, f
CLK
< 500kHz
Mode 1, f
CLK
< 500kHz, Q = 10
f
CLK
= 250kHz, 50:1, S
A/B
= High
f
CLK
= 500kHz, 100:1, S
A/B
= High
f
CLK
= 250kHz, 50:1, S
A/B
= Low
f
CLK
= 500kHz, 100:1, S
A/B
= Low
f
CLK
= 250kHz, 50:1, S
A/B
= Low
f
CLK
= 500kHz, 100:1, S
A/B
= Low
Mode 1, R1 = R2 = 50k
Mode 1, Q = 10, f
0
= 5kHz
f
CLK
≤
1MHz
●
●
●
●
●
●
MIN
TYP
0.1 to 20k
0.1 to 16k
MAX
UNITS
Hz
Hz
50
±
0.3%
50
±
0.8%
100
±
0.3%
100
±
0.8%
±0.5
±0.5
–10
20
2
3
6
2
4
2
4
±0.1
±0.1
10
1.5
5
70
3
5
%
%
ppm/°c
ppm/°c
mV
mV
mV
mV
mV
mV
mV
%
%
mV
(P-P)
MHz
mA
mA
dB
1060fb
●
●
●
●
●
●
●
15
40
80
30
60
30
60
2
3
●
8
12
2
U
W
U
U
W W
W
LTC1060
ELECTRICAL CHARACTERISTICS
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.
PARAMETER
Center Frequency Range
Clock-to-Center Frequency Ratio
LTC1060A
LTC1060
LTC1060A
LTC1060
Q Accuracy
LTC1060A
LTC1060
Max Clock Frequency
Power Supply Current
CONDITIONS
f
0
• Q
≤
100kHz
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 100:1, f
CLK
= 250kHz, Q = 10
Mode 1, 100:1, f
CLK
= 250kHz, Q = 10
Mode1, 50:1 or 100:1, f
0
= 2.5kHz, Q = 10
Mode1, 50:1 or 100:1, f
0
= 2.5kHz, Q = 10
●
●
MIN
TYP
0.1 to 10k
MAX
UNITS
Hz
50
±
0.5%
50
±
0.8%
100
±
0.5%
100
±
0.8%
±2
±4
500
2.5
4
%
%
kHz
mA
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
(Internal Op Amps).
PARAMETER
Supply Voltage Range
Voltage Swings
LTC1060A
LTC01060
LTC01060, LTC01060A
Output Short-Circuit Current
Source
Sink
Op Amp GBW Product
Op Amp Slew Rate
Op Amp DC Open Loop Gain
CONDITIONS
MIN
±2.37
±4
±
3.8
±3.6
±4
±4
±4
25
3
V
S
=
±5V
V
S
=
±5V
R
L
= 10k, V
S
=
±5V
2
7
85
TYP
MAX
±8
UNITS
V
V
V
V
mA
mA
MHz
V/µs
dB
V
S
=
±5V,
R
L
= 5k (Pins 1,2,19,20)
R
L
= 3.5k (Pins 3,18)
V
S
=
±5V
●
Note 1:
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
BLOCK DIAGRA
W
INVA 4
AGND 15
CLK
A
10
50/100/HOLD 12
LEVEL SHIFT 9
CLK
B
11
TO AGND
INV
B
17
V
D+
V
A+
8
7
N/AP/HP
A
S1A
3
5
BP
A
2
LP
A
1
–
+
+
∑
–
–
∫
∫
S
2A
LEVEL
SHIFT
NON-OVERLAP
CLOCK
CONTROL
LEVEL
SHIFT
NON-OVERLAP
CLOCK
S
2B
6 S
AB
+
–
13 14
V
D–
V
A–
18
+ –
∑
–
∫
∫
16
19
BP
B
20
LP
B
LTC1060 • BD01
N/AP/HP
B
S1B
1060fb
3
LTC1060
TYPICAL PERFOR A CE CHARACTERISTICS
Graph 1. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
V
S
=
±5V
0.4 T
A
= 25°C
= 250kHz
f
0
CLK
% DEVIATION (f
CLK
/f
0
)
0.1
–0.4
–0.8
–1.2
–1.6
–2.0
–2.4
f
CLK
= 50 (TEST POINT)
f
0
0
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
– 0.6
DEVIATION FROM IDEAL Q (%)
% DEVIATION (f
CLK
/f
0
)
0.1
1
IDEAL Q
10
Graph 4. Mode 1:
Q Error vs Clock Frequency
V
S
=
±7.5V
T
A
= 25°C
f
CLK
= 100:1
f
0
50 10
100
200
400
DEVIATION FROM IDEAL Q (%)
DEVIATION FROM IDEAL Q (%)
20
10
0
0
85°C
125°C
20 f
CLK
= 50:1
f
0
0
–20
0.2
T
A
= 25°C
– 55°C
DEVIATION FROM 100:1 (%)
100
20
10
0
50
f
CLK
= 50:1
f
0
400
200
10
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
LTC1060 • TPC04
Graph 7. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
0.8
0.6
DEVIATION FROM 50:1 (%)
DEVIATION FROM 100:1 (%)
0.4
0.2
0
Q = 10
–0.2
Q=5
–0.4
0
0.2
0.4
0.6 0.8
f
CLK
(MHz)
1.0
1.2
1.4
Q = 50
Q = 20
0.6
0.4
0.2
0
–0.2
0.2
–55°C
DEVIATION FROM 50:1 (%)
V
S
=
±5V
T
A
= 25°C
f
CLK
= 50:1
f
0
4
U W
Q=5
Graph 2. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
V
S
=
±5V
T
A
= 25°C
f
CLK
= 500kHz
f
CLK
f
CLK
= 100 (TEST POINT)
f
0
Graph 3. Mode 1:
Q Error vs Clock Frequency
V
S
=
±5V
T
A
= 25°C
V
S
=
±2.5V
50 20 10
10 Q = 5
20
50
100
20
10
0
20
10
0
Q=5
f
CLK
= 100:1
f
0
V
S
=
±2.5V
50
20 10 Q = 5
100
V
S
=
±5V
50 20 10
Q=5
f
CLK
= 50:1
f
0
100
LT1060 • TPC01
0.1
1
IDEAL Q
10
100
LT1060 • TPC02
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
LTC1060 • TPC03
Graph 5. Mode 1: Measured Q vs
f
CLK
and Temperature
V
S
=
±5V
Q = 10
20 f
CLK
= 100:1
f
0
Graph 6. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
0.8
V
S
=
±5V
T
A
= 25°C
f
CLK
= 100:1
f
0
85°C
125°C
T
A
= 25°C
–55°C
Q=5
0.6
0.4
0.2
Q = 20
Q = 50
0
Q = 10
–0.2 Q = 5
–0.4
0
0.2
0.4
0.6 0.8
f
CLK
(MHz)
1.0
1.2
1.4
0.4
0.6
0.8 1.0 1.2
f
CLK
(MHz)
1.4
1.6
1.8
LTC1060 • TPC05
LTC1060 • TPC06
Graph 8. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
1.0
V
S
=
±5V
Q = 10
0.8 f
CLK
= 100:1
f
0
125°C
85°C
T
A
= 25°C
1.0
Graph 9. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
V
S
=
±5V
Q = 10
125°C
0.8 f
CLK
= 50:1
f
0
0.6
0.4
0.2
0
–0.2
0.2
–55°C
85°C
T
A
= 25°C
0.4
0.6
0.8 1.0 1.2
f
CLK
(MHz)
1.4
1.6
1.8
0.4
0.6
0.8 1.0 1.2
f
CLK
(MHz)
1.4
1.6
1.8
LTC1060 • TPC09
LTC1060 • TPC07
LTC1060 • TPC08
1060fb
LTC1060
TYPICAL PERFOR A CE CHARACTERISTICS
Graph 10. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
1.0
0.8
0.6
0.4
Q = 20
0.2
0
–0.2
0
Q=5
100
200
Q = 10
Q = 50
V
S
=
±2.5V
T
A
= 25°C
f
CLK
= 100:1
f
0
DEVIATION FROM 100:1 (%)
DEVIATION FROM 100:1 (%)
DEVIATION FROM 50:1 (%)
300 400 500
f
CLK
(MHz)
Graph 13. Mode 1: (f
CLK
/f
0
) vs
f
CLK
and Temperature
1.0
0.8
DEVIATION FROM 50:1 (%)
0.6
0.4
125°C
0.2
0
–0.2
0
0.2
0.4
0.6
0.8
f
CLK
(kHz)
V
S
=
±2.5V
Q = 10
f
CLK
= 50:1
f
0
1.0
1.2
T
A
= 25°C
85°C
NOTCH DEPTH (dB)
80
60
40
20
0
–55°C
120
100
f
CLK
DEVIATION OF f WITH RESPECT TO
O
Q = 10 MEASUREMENT (%)
Graph 16. Mode 3:
Q Error vs Clock Frequency
V
S
=
±2.5V
DEVIATION FROM IDEAL Q (%)
V
S
=
±5V
50
20 10
DEVIATION FROM IDEAL Q (%)
20
10
0
20
10
0
10 20 Q = 5
T
A
= 25°C
f
CLK
= 100:1
f
0
Q=5
Q ERROR (%)
50
V
S
=
±2.5V
V
S
=
±5V
10 Q = 5 20
20
50
10 Q = 5
50
f
CLK
= 50:1
f
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
LTC1060 • TPC16
U W
600
Graph 11. Mode 1:
(f
CLK
/f
0
) vs f
CLK
and Q
0.8
0.6
0.4
0.2
0
Q = 10
– 0.2
Q=5
–0.4
700
Graph 12. Mode 1: (f
CLK
/f
0
) vs f
CLK
and Temperature
1
V
S
=
±2.5V
Q = 10
f
CLK
= 100:1
f
0
–55°C
V
S
=
±2.5V
T
A
= 25°C
f
CLK
= 50:1
f
0
0.8
0.6
0.4
0.2
0
85°C
T
A
= 25°C
125°C
Q = 50
Q = 20
0
100
200
300 400 500
f
CLK
(MHz)
600
700
0
0.2
0.4
0.6
0.8
f
CLK
(kHz)
1.0
1.2
LTC1060 • TPC10
LTC1060 • TPC11
LTC1060 • TPC12
Graph 14. Mode 1:
Notch Depth vs Clock Frequency
Q = 10
100:1 Q = 1
100:1
V
S
=
±5V
T
A
= 25°C
V
IN
= 1V
RMS
Graph 15. Mode 3: Deviation of
(f
CLK
/f
0
) with Respect to Q = 10
Measurement
V
S
=
±5V
T
A
= 25°C
PIN 12 AT 100:1
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.1
1
IDEAL Q
10
100
LTC1060 • TPC15
f
CLK
= 500: 1
f
O
R2 1
=
R4 5
(A)
R2 1
=
R4 2
(B)
f
CLK
= 200: 1
f
O
Q = 10
50:1
0
0.2
0.4
0.6 0.8 1.0
f
CLK
(MHz)
1.2
1.4
1.6
LTC1060 • TPC13
LTC1060 • TPC14
Graph 17. Mode 3 (R2 = R4):
Q Error vs Clock Frequency
40
Graph 18. Mode 3 (R2 = R4):
Measured Q vs f
CLK
and
Temperature
V
S
=
±5V
125°C
Q = 10
20 f
CLK
= 100:1
f
0
0
125°C
–20
40 f
CLK
= 50:1
f
0
20
85°C
0
–20
0.2
20
10
0
20
10
0
V
S
=
±7.5V
T
A
= 25°C
f
CLK
= 100:1
f
0
50
10
Q=5
85°C
T
A
= 25°C
–55°C
10
50
Q=5
f
CLK
= 50:1
f
0
T
A
= 25°C
–55°C
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
LTC1060 • TPC17
0.4
0.6
0.8 1.0 1.2
f
CLK
(MHz)
1.4
1.6
1.8
LTC1060 • TPC18
1060fb
5
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