LTC1068 Series Clock-Tunable, Quad Second Order, Filter Building Blocks FEATURES DESCRIPTION n Four Identical 2nd Order Filter Sections in an The LTC 1068 product family consists of four monolithic SSOP Package clock-tunable filter building blocks. Each product contains n 2nd Order Section Center Frequency Error: four matched, low noise, high accuracy 2nd order switched- 0.3% Typical and 0.8% Maximum capacitor filter sections. An external clock tunes the center n Low Noise per 2nd Order Section, Q 5: frequency of each 2nd order filter section. The LTC1068 LTC1068-200 50V , LTC1068 50V products differ only in their clock-to-center frequency RMS RMS LTC1068-50 75V , LTC1068-25 90V ratio. The clock-to-center frequency ratio is set to 200:1 RMS RMS n Low Power Supply Current: 4.5mA, Single 5V, (LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or LTC1068-50 25:1 (LTC1068-25). External resistors can modify the clock- n Operation with 5V Power Supply, Single 5V to-center frequency ratio. High performance, quad 2nd Supply or Single 3.3V Supply order, dual 4th order or 8th order filters can be designed with an LTC1068 family product. Designing filters with an APPLICATIONS LTC1068 product is fully supported by FilterCAD filter design software for Windows. n Lowpass or Highpass Filters: LTC1068-200, 0.5Hz to 25kHz LTC1068, 1Hz to The LTC1068 products are available in a 28-pin SSOP 50kHz LTC1068-50, 2Hz to 50kHz LTC1068-25, surface mount package. A customized version of an 4Hz to 200kHz LTC1068 family product can be obtained in a 16-lead SO n Bandpass or Bandreject (Notch) Filters: package with internal thin-film resistors. Please contact LTC1068-200, 0.5Hz to 15kHz LTC1068, 1Hz to LTC Marketing for details. 30kHz LTC1068-50, 2Hz to 30kHz LTC1068-25, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and FilterCAD is a trademark of Linear Technology Corporation. All other trademarks are the property 4Hz to 140kHz of their respective owners. TYPICAL APPLICATION Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up to 200kHz f 3dB = f /25, 4th Order Filter Noise = 60V CLK RMS R12 14k R11 20k 1 28 Gain vs Frequency V INV B INV C IN1 R21 14k R22 20k 2 27 10 HPB/NB HPC/NC R31 20k R32 10k 3 26 0 BPB BPC 4 25 10 LPB LPC V OUT1 5 24 20 SB SC LTC1068-25 6 23 30 NC V 5V 1F 7 22 40 AGND NC 50 8 21 + 5V V CLK f = (25)(f 3dB) CLK 0.1F 60 9 20 NC NC 70 10 19 SA SD 80 11 18 0.1 1 10 LPA LPD V OUT2 R33 20k R34 10k RELATIVE FREQUENCY f /(f 3dB) 12 17 IN BPA BPD 1068 TA02 R23 14k R24 20k 13 16 HPA/NA HPD/ND R13 20k 14 15 V INVA INVD IN2 R14 14k 1068 TA01 1068fc 1 GAIN (dB)LTC1068 Series ABSOLUTE MAXIMUM RATINGS (Note 1) + Total Supply Voltage (V to V ) ................................12V Operating Temperature Range Power Dissipation .............................................. 500mW LTC1068C ................................................ 0C to 70C + Input Voltage at Any Pin ......V 0.3V V V + 0.3V LTC1068I............................................. 40C to 85C IN Storage Temperature Range ................... 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C PIN CONFIGURATION TOP VIEW INV B 1 28 INV C TOP VIEW 2 27 HPC/NC HPB/NB INV B 1 24 INV C BPB 3 26 BPC HPB/NB 2 HPC/NC 23 4 25 LPC LPB BPB 3 22 BPC SB 5 24 SC LPB 4 21 LPC NC 6 23 V SB 5 20 SC 7 22 NC AGND AGND 6 19 V + + V 7 CLK V 8 21 CLK 18 SA 8 17 SD 9 20 NC NC LPA 9 16 LPD SA 10 19 SD BPA 10 15 BPD LPA 11 18 LPD HPA/NA 11 14 HPD/ND 12 17 BPD BPA INV A 12 INV D 13 HPA/NA 13 16 HPD/ND N PACKAGE 14 15 INV D INV A 24-LEAD PDIP T = 110C, = 65C/W JMAX JA G PACKAGE 28-LEAD PLASTIC SSOP T = 110C, = 95C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1068CG PBF LTC1068CG TRPBF LTC1068 28-Lead Plastic SSOP 0C to 70C LTC1068IG PBF LTC1068IG TRPBF LTC1068 28-Lead Plastic SSOP 40C to 85C LTC1068-200CG PBF LTC1068-200CG TRPBF LTC1068 28-Lead Plastic SSOP 0C to 70C LTC1068-200IG PBF LTC1068-200IG TRPBF LTC1068 28-Lead Plastic SSOP 40C to 85C LTC1068-50CG PBF LTC1068-50CG TRPBF LTC1068 28-Lead Plastic SSOP 0C to 70C LTC1068-50IG PBF LTC1068-50IG TRPBF LTC1068 28-Lead Plastic SSOP 40C to 85C LTC1068-25CG PBF LTC1068-25CG TRPBF LTC1068 28-Lead Plastic SSOP 0C to 70C LTC1068-25IG PBF LTC1068-25IG TRPBF LTC1068 28-Lead Plastic SSOP 40C to 85C LTC1068CN PBF NA LTC1068 24-Lead PDIP 0C to 70C LTC1068IN PBF NA LTC1068 24-Lead PDIP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: