Document
U U
LTC1061
High Performance Triple Universal Filter Building Block
FEATURES
■ Three Filters in a Single Package ■ Up to 6th Order Filter Functions ■ Center Frequency Range up to 35kHz ■ fO × Q Product up to 1MHz ■ Guaranteed Center Frequency and Q Accuracy Over
Temperature ■ Guaranteed Low Offset Voltages Over Temperature ■ 90dB Signal-to-Noise Ratio ■ Operation from Single 4.7V Supply, Up to ±8V ■ Guaranteed Filter Specifications with ±5V Supply and
±2.37V Supply ■ Low Power Consumption with Single 5V Supply ■ Clock Inputs T2L and CMOS Compatible ■ Available in 20-Pin DIP and 20-Pin SO Wide Package
U APPLICATIO S
■ High Order, Wide Frequency Range Bandpass, Lowpass, Notch Filters
■ Low Power Consumption, Single 5V Supply, Clock-Tunable Filters
■ Tracking Filters ■ Antialiasing Filters
DESCRIPTIO
The LTC®1061 consists of three high performance, universal 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 lowpass 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 ±2.37V to ±8V (or 4.74V to 16V). When the filter operates with supplies of ±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 realization can be obtained.
, LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOSTM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
6th Order, Clock-Tunable, 0.5dB Ripple Chebyshev BP Filter
9.31k
165k VIN < 100kHz
1k 165k 4.99k
7.5V T2 CLK IN < 1.2MHz
1 20 2 19 78.7k 3 18 4.99k 4 17 23.7k
5 16 LTC1061
6 15 V– = –7.5V 7 14 4.99k 8 13 165k 9 12 5.49k
49.9k
V+ = 7.5V
10
11
VOUT
1061 TA01
FILTER GAIN (dB)
Amplitude Response
2kHz 0
fCLK = 1MHz
–20
–40
–60
–80
–100 0
10 20 30 40 INPUT FREQUENCY GAIN (kHz)
50
1061 TA02
1061fe
1
LTC1061
U WU
U WW W
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage ....................................................... 18V Power Dissipation ............................................. 500mW Operating Temperature Range
LTC1061AC, LTC1061C ............ –40°C ≤ TA ≤ 85°C LTC1061AM, LTC1061M ......... –55°C ≤ TA ≤ 125°C Storage Temperature Range ................. –65°C to 150°C Lead Temperature (Soldering, 10 sec.)................ 300°C
PACKAGE/ORDER I FOR ATIO
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