Document
U U
LTC1064
Low Noise, Fast, Quad Universal Filter Building Block
FEATURES
DESCRIPTIO
■ Four Filters in a 0.3 Inch Wide Package ■ Maximum Center Frequency: 140kHz ■ Customized Version with Internal Resistors
Available ■ One Half the Noise of the LTC1059/LTC1060/
LTC1061 Devices ■ Maximum Clock Frequency: 7MHz ■ Clock-to-Center Frequency Ratio of 50:1 and 100:1
Simultaneously Available ■ Power Supplies: ±2.375V to ±8V ■ Low Offsets ■ Low Harmonic Distortion ■ Available in 24-Pin DIP and SO Wide Packages
U APPLICATIO S
■ Anti-Aliasing Filters ■ Wide Frequency Range Tracking Filters ■ Spectral Analysis ■ Loop Filters
The LTC®1064 consists of four high speed, low noise switched-capacitor filter building blocks. Each filter building block, together with an external clock and three to five resistors can provide various 2nd order functions like lowpass, highpass, bandpass and notch. The center frequency of each 2nd order function can be tuned with an external clock, or a clock and resistor ratio. For Q ≤ 5, the center frequency range is from 0.1Hz to 100kHz. For Q ≤ 3, the center frequency range can be extended to 140kHz. Up to 8th order filters can be realized by cascading all four 2nd order sections. Any classical filter realization (such as Butterworth, Cauer, Bessel and Chebyshev) can be formed.
A customized monolithic version of the LTC1064 including internal thin film resistors can be obtained for high volume applications. Consult LTC Marketing for details.
, LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Clock-Tunable 8th Order Cauer Lowpass Filter with fCUTOFF up to 100kHz
13k
22.1k VIN
10k 18.25k 10.7k
8V
(FROM RH2, RL2)
0.1µF 10k 49.9K 11.5K
66.5k
1 INV B
INV C 24
2 HPB/NB HPC/NC 23
3 BPB
BPC 22
4 LPB
LPC 21
5 SB
SC 20
6 AGND
V– 19
7 V+ LTC1064 CLK 18
8 SA
50/100 17
9 LPA
LPD 16
10 BPA
BPD 15
11 HPA/NA
HPD 14
12 INV A
INV D 13
10k 12.1k 17.4k
5MHz 8V
41.2k 12.7k 14k 121k
RH2 102k
RL2 26.7k
0.1µF
PIN 12
– 8V VOUT
10k
FOR fCLK = 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1 C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12
WIDEBAND NOISE ≅ 140µVRMS
1064 TA01
GAIN (dB)
Gain vs Frequency
0
–15
–30
–45 fCLK = 5MHz –60 RIPPLE = ±0.1dB
–75 –90 –105
fCLK = 1MHz RIPPLE = ±0.05dB
–120
–135 1k
10k 100k INPUT FREQUENCY (Hz)
1M
1064 TA02
1064fb
1
LTC1064
U WW W
ABSOLUTE AXI U RATI GS (Note 1)
Total Supply Voltage (V + to V –) ............................. 16V Power Dissipation ............................................. 500mW Operating Temperature Range
LTC1064AC/LTC1064C .................... – 40°C to 85°C LTC1064AM LTC1064M (OBSOLETE) ............... – 55°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C
UW U PACKAGE/ORDER I FOR ATIO
TOP VIEW
INV B 1 HPB/NB 2
BPB 3 LPB 4 SB 5 AGND 6
V+ 7 SA 8 LPA 9 BPA 10 HPA/NA 11 INV A 12
24 INV C 23 HPC/NC 22 BPC 21 LPC 20 SC 19 V– 18 CLK 17 50/100 16 LPD 15 BPD 14 HPD 13 INV D
ORDER PART NUMBER
LTC1064ACN LTC1064CN
N PACKAGE 24-LEAD PLASTIC DIP
TJMAX = 110°C, θJA = 65°C/W
J PACKAGE 24-LEAD CERAMIC DIP TJMAX = 150°C, θJA = 100°C/W
LTC1064ACJ LTC1064CJ LTC1064AMJ LTC1064MJ
OBSOLETE PACKAGE
Consider the 24-Lead N Package as an Alternate Source
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
INV B 1 HPB/NB 2
BPB 3 LPB 4
SB 5 AGND 6
V+ 7 SA 8 LPA 9 BPA 10 HPA/NA 11 INV A 12
24 INV C 23 HPC/NC 22 BPC 21 LPC 20 SC 19 V– 18 CLK 17 50/100 16 LPD 15 BPD 14 HPD 13 INV D
SW PACKAGE 24-LEAD PLASTIC SO WIDE
TJMAX = 100°C, θJA = 85°C/ W
ORDER PART NUMBER
LTC1064CSW
ELECTRICAL CHARACTERISTICS (Internal Op Amps) The ● denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER Operating Supply Voltage Range Voltage Swings
Output Short-Circuit Current (Source/Sink) DC Open-Loop Gain GBW Product Slew Rate
CONDITIONS
VS = ±5V, RL = 5k
VS = ±5V VS = ±5V, RL = 5k VS = ±5V VS = ±5V
MIN TYP MAX UNITS
± 2.375
±8 V
±3.2 ● ±3.1
±3.6
V V
3 mA
80 dB
7 MHz
10 V/µs
1064fb
2
LTC1064
ELECTRICAL CHARACTERISTICS (Complete Filter) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at VS = ±5V, TA = 25°C, TTL clock input level, unless otherwise specified.
PARAMETER
Center Frequency Range, fO Input Frequency Range Clock-to-Center Frequency Ratio, fCLK/fO
LTC1064 LTC1064A (Note 2)
LTC1064 LTC1064A (Note 2)
Clock-to-Center Frequency Ratio, Side-to-Side Matching
Clock-to-Center Frequency Ratio, fCLK/fO (Note 3)
LTC1064 LTC1064A (Note 2)
LTC1064 LTC1064A.