LTC1061
High Performance Triple
Universal Filter Building Block
FEATURES
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DESCRIPTIO
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Up to 6th Order Filter Functions with a Single 20-Pin
0.3" Wide Package
Center Frequency Range up to 35kHz
f
O
脳
Q Product up to 1MHz
Guaranteed
Center Frequency and Q Accuracy Over
Temperature
Guaranteed
Low Offset Voltages Over Temperature
90dB Signal-to-Noise Ratio
Filter Operates from Single 4.7V Supply and up to
鹵8V
Supplies
Guaranteed
Filter Specifications with
鹵5V
Supply and
鹵2.37V
Supply
Low Power Consumption with Single 5V Supply
Clock Inputs T
2
L and CMOS Compatible
The LTC1061 consists of three high performance, univer-
sal filter building blocks. Each filter building block together
with an external clock and 2 to 5 resistors can produce
various second order functions which are available at its
three output pins. Two out of three always provide low-
pass and bandpass functions while the third output pin
can produce highpass or notch or allpass. The center
frequency of these functions can be tuned with an external
clock or an external clock and a resistor ratio. For Q < 5, the
center frequency ranges from 0.1Hz to 35kHz. For Qs of 10
or above, the center frequency ranges from 0.1Hz to
28kHz.
The LTC1061 can be used with single or dual supplies
ranging from
鹵2.37V
to
鹵8V
(or 4.74V to 16V). When the
filter operates with supplies of
鹵5V
and above, it can
handle input frequencies up to 100kHz.
The LTC1061 is compatible with the LTC1059 single
universal filter and the LTC1060 dual. Higher than 6th
order functions can be obtained by cascading the LTC1061
with the LTC1059 or LTC1060. Any classical filter realiza-
tion can be obtained.
The LTC1061 is manufactured by using Linear Technology鈥檚
enhanced LTCMOS
TM
silicon gate process.
APPLICATI
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High Order, Wide Frequency Range Bandpass,
Lowpass, Notch Filters
Low Power Consumption, Single 5V Supply,
Clock-Tunable Filters
Tracking Filters
Antialiasing Filters
LTCMOS
TM
is a trademark of Linear Technology Corp.
TYPICAL APPLICATI
6th Order, Clock-Tunable, 0.5dB Ripple Chebyshev BP Filter
f
CLK
= 1MHz
2kHz
9.31k
1k
165k
4.99k
165k
V
IN
< 100kHz
1
2
3
4
5
6
7.5V
T
2
CLK IN < 1.2MHz
7
8
9
V
+
= 7.5V
10
LTC1061
20
19
18
17
16
15
14
13
12
11
V
OUT
1061 TA01
78.7k
4.99k
23.7k
49.9k
V
鈥?/div>
= 鈥?.5V
4.99k
165k
5.49k
鈥?0
FILTER GAIN (dB)
鈥?0
鈥?0
鈥?0
鈥?00
0
10
20
30
40
INPUT FREQUENCY GAIN (kHz)
50
LTC1061 鈥?TA02
U
Amplitude Response
0
UO
UO
1
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