LTC1059
High Performance
Switched Capacitor Universal Filter
FEATURES
■
■
■
■
■
■
DESCRIPTIO
■
■
■
■
All Filter Parameters
Guaranteed
Over Temperature
Wide Center Frequency Range (0.1Hz to 40kHz)
Low Noise, Wide Dynamic Range
Guaranteed
Operation for
±2.37V
and
±5V
Supply
Low Power Consumption
Guaranteed
Clock-to-Center Frequency Accuracy of
0.8%
Guaranteed
Low Offset Voltages Over Temperature
Very Low Center Frequency and Q Tempco
Clock Input T
2
L or CMOS Compatible
Separate Highpass (or Notch or Allpass), Bandpass,
Lowpass Outputs
APPLICATIO S
■
■
■
■
The LTC
®
1059 consists of a general purpose, high perfor-
mance, active filter building block and an uncommitted op
amp. The filter building block together with an external
clock and 2 to 5 resistors can produce various 2nd order
functions which are available at its three output pins. Two
out of three always provide lowpass and bandpass func-
tions while the third output pin can produce notch or
highpass or allpass. The center frequency of these func-
tions can be tuned from 0.1Hz to 40kHz and is dependent
on an external clock or an external clock and a resistor
ratio. The filter can handle input frequencies up to 100kHz.
The uncommitted op amp can be used to obtain additional
allpass and notch functions, for gain adjustment or for
cascading techniques.
Higher than 2nd order filter functions can be obtained by
cascading the LTC1059 with the LTC1060 dual universal
filter or the LTC1061 triple universal filter. Any classical
filter realization (such as Butterworth, Cauer, Bessel and
Chebyshev) can be formed.
The LTC1059 can be operated with single or dual supplies
ranging from
±2.37V
to
±8V
(or 4.74V to 16V single
supply).
The LTC1059 is manufactured by using Linear Technology’s
enhanced LTCMOS
TM
silicon gate process.
Sinewave Oscillators
Sweepable Bandpass/Notch Filters
Full Audio Frequency Filters
Tracking Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
50k
1
7.15k
V
IN
DC-200kHz
50k
2
3
4
5
8V
6
7
Wide Range 2nd Order Bandpass/Notch Filter with Q = 10
1.2
CENTER FREQUENCY ERROR NORMALIZED
TO 5kHz MEASUREMENT (%)
Center Frequency and Q Error
1.0
0.8
0.6
0.4
0.2
Q ERROR
0
0
5
10 15 20 25 30 35 40
IDEAL CENTER FREQUENCY (kHz)
0
45
CENTER
FREQUENCY
ERROR
T
A
= 25°C
CLOCK
= 35.35
CENTER FREQUENCY
1
30
DEVIATION FROM IDEAL Q OF 10 (%)
NOTCH OUT
BP OUT
BP
LP
14
LTC1059
13
V
02
N/AP/HP
INV1
S1
S
A
INV2
AGND
V
–
12
11
10
9
8
–8V
V
+
50/100/HOLD
LSh
CLK
T
2
L CLOCK IN
≤
2MHz
1059 TA01a
U
25
20
15
10
5
1058 TA01b
U
U
1059fd
1
LTC1059
ABSOLUTE
(Note 1)
TOP VIEW
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
BP
N/AP/HP
INV1
S1
S
A
V
+
LSh
1
2
3
4
5
6
7
14 LP
13 V
02
12 INV2
11 AGND
10 V
–
9
8
50/100/HOLD
CLK
Supply Voltage ........................................................ 18V
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC1059C ................................... –40°C
≤
T
A
≤
85°C
LTC1059AM, LTC1059M ........... –55°C
≤
T
A
≤
125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1059CN
LTC1059CS
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 110°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 110°C,
θ
JA
= 110°C/W (S)
J PACKAGE
14-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 80°C/W
OBSOLETE PACKAGE
Consider the N or S Package for Alternate Source
LTC1059ACJ
LTC1059AMJ
LTC1059CJ
LTC1059MJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Center Frequency Range, f
0
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
(Complete Filter) V
S
=
±5V,
T
2
L clock input level unless otherwise specified.
CONDITIONS
f
0
• Q
≤
400kHz, Mode 1
f
0
• Q
≤
1.6MHz, Mode 1
f
0
• Q
≤
250kHz, Mode 3, V
S
=
±7.5V
f
0
• Q
≤
1MHz, Mode 3, V
S
=
±7.5V
MIN
TYP
0.1 - 40k
0.1 - 18k
0.1 - 20k
0.1 - 16k
0 - 200k
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 100:1, f
CLK
= 500kHz, Q = 10
Q Accuracy
f
0
Temperature Coefficient
Q Temperature Coefficient
DC Offset
V
OS1
V
OS2
V
OS2
V
OS2
V
OS2
V
OS2
V
OS2
V
OS2
V
OS2
V
OS3
V
OS3
V
OS3
V
OS3
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
High (N Package)
f
CLK
= 250kHz, 50:1, S
A
High (S Package)
f
CLK
= 500kHz, 100:1, S
A
High (N Package)
f
CLK
= 500kHz, 100:1, S
A
High (S Package)
f
CLK
= 250kHz, 50:1, S
A
Low (N Package)
f
CLK
= 250kHz, 50:1, S
A
Low (S Package)
f
CLK
= 500kHz, 100:1, S
A
Low (N Package)
f
CLK
= 500kHz, 100:1, S
A
Low (S Package)
f
CLK
= 250kHz, 50:1 (N Package)
f
CLK
= 250kHz, 50:1 (S Package)
f
CLK
= 500kHz, 100:1 (N Package)
f
CLK
= 500kHz, 100:1 (S Package)
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MAX
UNITS
Hz
Hz
Hz
Hz
Hz
Input Frequency Range
Clock-to-Center Frequency Ratio
50
±
0.8%
100
±
0.8%
±0.5
5
15
2
3
3
6
6
2
2
4
4
2
2
4
4
15
30
40
60
80
20
30
40
60
20
30
40
60
5
%
ppm/°C
ppm/°C
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
2
U
1059fd
W
U
U
W W
W
LTC1059
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
(Complete Filter) V
S
=
±5V,
T
2
L Clock Input Level unless otherwise specified.
PARAMETER
DC Lowpass Gain Accuracy
BP Gain Accuracy at f
0
Clock Feedthrough
Max Clock Frequency
Power Supply Current
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
Mode 1, R1 = R2 = 50kΩ
Mode 1, Q = 10, f
0
= 5kHz
f
CLK
≤
1MHz
Mode 1, Q < 5, V
S
≥
±5V
●
MIN
TYP
±0.1
±0.1
10
2
3.5
MAX
2
UNITS
%
%
mV
MHz
5.5
7
mA
mA
(Complete Filter) V
S
=
±2.37V
unless otherwise specified.
PARAMETER
Center Frequency Range
Input Frequency Range
Clock-to-Center Frequency Ratio
Mode 1, 50:1, f
CLK
= 250kHz, Q = 10
Mode 1, 100:1, f
CLK
= 250kHz, Q = 10
Q Accuracy
Max Clock Frequency
Power Supply Current
Mode 1, f
CLK
= 250kHz, Q = 10
50:1 and 100:1
50
±
0.8%
100
±
0.8%
±2
700
1.5
2.5
%
kHz
mA
CONDITIONS
f
0
• Q
≤
120kHz, Mode 1, 50:1
f
0
• Q
≤
120kHz, Mode 3, 50:1
MIN
TYP
0.1 - 12k
0.1 - 10k
60k
MAX
UNITS
Hz
Hz
Hz
(Internal Op Amps) The
●
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C.
PARAMETER
Supply Voltage Range
Voltage Swings
V
S
=
±5V,
R
L
= 5k (Pins 1, 14)
R
L
= 3.5k (Pins 2, 13)
Input Offset Voltage
Input Bias Current
Output Short-Circuit Current Source/Sink
DC Open Loop Gain
GBW
Slew Rate
V
S
=
±5V
(N Package)
V
S
=
±5V
(S Package)
V
S
=
±5V
V
S
=
±5V
V
S
=
±5V
●
●
CONDITIONS
MIN
±2.375
±3.8
±3.6
TYP
MAX
±8
UNITS
V
V
V
±4.2
1
3
40/3
25/3
80
2
7
15
mV
pA
mA
mA
dB
MHz
V/µs
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
1059fd
3
LTC1059
TYPICAL PERFOR A CE CHARACTERISTICS
Graph 1. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
0.8
V
S
=
±5V
0.4 T
A
= 25°C
= 250kHz
f
0
CLK
% DEVIATION (f
CLK
/f
0
)
% DEVIATION (f
CLK
/f
0
)
–0.4
–0.8
–1.2
–1.6
–2.0
–2.4
–2.8
–3.2
0.1
1
IDEAL Q
1060 G01
0
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
– 0.6
f
CLK
= 50 (TEST POINT)
f
0
Q ENHANCEMENT (%)
10
Graph 4. Mode 1: Q Error
vs Clock Frequency
V
S
=
±7.5V
T
A
= 25°C
f
CLK
= 100:1
f
0
Q = 10
50-100
5
Q ERR0R (%)
DEVIATION FROM 100:1 (%)
20
Q ENHANCEMENT (%)
10
0
20
50
10 f
CLK
100
= 50:1
f
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
1059 G04
Q = 10
Graph 7. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Q
0.8
0.6
DEVIATION FROM 100:1 (%)
DEVIATION FROM 50:1 (%)
0.4
Q = 50
0.2
0
–0.2
–0.4
0
0.2
0.4
0.6 0.8 1.0
f
CLK
(MHz)
1.2
1.4
1.6
Q = 20
Q = 10
0.6
125°C
0.4
0.2
0
–0.2
0.2
85°C
T
A
= 25°C
–55°C
DEVIATION FROM 50:1 (%)
V
S
=
±5V
T
A
= 25°C
f
CLK
= 50:1
f
0
Q=5
4
U W
5
1059 G07
Graph 2. Mode 1:
(f
CLK
/f
0
) Deviation vs Q
0.3
V
S
=
±5V
0.2 T
A
= 25°C
= 500kHz
f
0.1
CLK
f
CLK
f
CLK
= 100 (TEST POINT)
f
0
Graph 3. Mode 1: Q Error
vs Clock Frequency
T
A
= 25°C
V
S
=
±2.5V
V
S
=
±5V
f
CLK
Q = 20
Q = 10
20 f = 100:1
0
5
5
100 20
50
10
0
20
10
0
V
S
=
±2.5V
V
S
=
±5V
Q = 20
Q = 10
5 10020
50
5
100
– 0.7
0.1
f
CLK
= 50:1
f
0
1
IDEAL Q
10
100
1060 G02
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
1060 G03
Graph 5. Mode 1: Measured Q
vs f
CLK
and Temperature
V
S
=
±5V
Q = 10
20 f
CLK
= 100:1
f
0
0
–55°C
f
CLK
= 50:1
f
0
125°C
85°C
T
A
= 25°C
0
–55°C
–0.4
Graph 6. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Q
0.8
0.6
0.4
0.2
0
–0.2
V
S
=
±5V
T
A
= 25°C
f
CLK
= 100:1
f
0
125°C
T
A
= 25°C
85°C
Q = 50
Q = 10
Q=5
20
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
1059 G05
0
0.2
0.4
0.6 0.8 1.0
f
CLK
(MHz)
1.2
1.4
1.6
1059 G06
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
1.0
Graph 9. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Temperature
V
S
=
±5V
Q = 10
0.8 f
CLK
= 50:1
f
0
0.6
125°C
0.4
85°C
0.2
–55°C
0
–0.2
0.2
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
1059 G08
1059 G09
1059fd
LTC1059
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
0.2
Q = 50
0 Q = 20
Q = 10
Q=5
–0.2
0
0.1
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 (%)
0.2
0.3 0.4 0.5
f
CLK
(MHz)
Graph 13. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Temperature
1.0
V
S
=
±2.5V
Q = 10
0.8 f
CLK
= 50:1
f
0
0.6
0.4
0.2
0
–0.2
0
0.2
0.4
0.6
0.8
f
CLK
(MHz)
1.0
1.2
1059 G13
DEVIATION OF (f
CLK
/f
0
) WITH RESPECT TO
Q = 10 MEASUREMENT (%)
DEVIATION FROM 50:1 (%)
NOTCH DEPTH (dB)
T
A
= 25°C
85°C
125°C
Graph 16. Mode 3: Q Error
vs Clock Frequency
T
A
= 25°C
V
S
=
±
2.5V V
S
=
±5V
f
CLK
= 100:1
Q = 10
f
0
Q = 10
50
5
5
20
20
Q ENHANCEMENT (%)
Q ENHANCEMENT (%)
0
20
10
0
V
S
=
±
2.5V V
S
=
±5V
Q = 10
5
50
Q = 10
5
20
0
20
10
0
Q = 10
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)
1059 G17
Q ERR0R (%)
10
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
f
CLK
(MHz)
1059 G16
U W
0.6
0.7
–55°C
f
CLK
= 50:1
f
0
Graph 11. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Q
0.8
V
S
=
±2.5V
T
A
= 25°C
0.6 f
CLK
= 50:1
f
0
1.0
0.8
0.6
Graph 12. Mode 1: (f
CLK
/f
0
)
vs f
CLK
and Temperature
V
S
=
±2.5V
Q = 10
f
CLK
= 100:1
f
0
85°C
T
A
= 25°C
0.4
0.2
Q = 50
Q = 20
0.4
0.2
0
125°C
–55°C
0 Q = 10
–0.2
Q=5
–0.4
0
0.1
0.2
0.3 0.4 0.5
f
CLK
(MHz)
0.6
0.7
0.8
–0.2
0
0.2
0.4
0.6
0.8
f
CLK
(MHz)
1.0
1.2
0.8
1059 G10
1059 G11
1059 • G12
Graph 14. Mode 1: Notch Depth
vs Clock Frequency
120
100
80
60
40
20
0
0
0.2
0.4
0.6 0.8 1.0
f
CLK
(MHz)
1.2
1.4
1.6
Q = 10
50:1
Q = 10
100:1
Q=1
100:1
0.4
V
S
=
±5V
T
A
= 25°C
V
IN
= 1V
RMS
0.3
0.2
0.1
0
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
Graph 15. Mode 3: Deviation of
(f
CLK
/f
0
) with Respect to Q = 10
Measurement
V
S
=
±5V
T
A
= 25°C
PIN 9 AT 100:1
√
f
CLK
f
CLK
= 500:1
f
0
R2 = 5
R4
(A)
(B)
√
f
CLK
f
CLK
= 200:1
f
0
R2 = 2
R4
– 0.6
0.1
1
IDEAL Q
10
100
1059 G15
1059 G14
Graph 17. Mode 3 (R2 = R4): Q
Error vs Clock Frequency
V
S
=
±7.5V
T
A
= 25°C
20 f
CLK
= 100:1
f
0
10
Q = 10
50
Graph 18. Mode 3 (R2 = R4):
Measured Q vs f
CLK
and
Temperature
V
S
=
±
5V
Q = 10
20 f
CLK
= 100:1
f
0
0
125°C
85°C
T
A
= 25°C
–55°C
5
125°C
20
0
85°C
T
A
= 25°C
–55°C
5
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)
1059 G18
1059fd
5
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