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LTC1068I Datasheet(PDF) 1 Page - Linear Technology |
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LTC1068I Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page 1 LTC1068 Series Clock-Tunable, Quad Second Order, Filter Building Blocks S FEATURE s Four Identical 2nd Order Filter Sections in an SSOP Package s 2nd Order Section Center Frequency Error: ±0.3% Typical and ±0.8% Maximum s Low Noise per 2nd Order Section, Q ≤ 5: LTC1068-200 50 µVRMS, LTC1068 50µVRMS LTC1068-50 75 µVRMS, LTC1068-25 90µVRMS s Low Power Supply Current: 4.5mA, Single 5V, LTC1068-50 s Operation with ±5V Power Supply, Single 5V Supply or Single 3.3V Supply The LTC ®1068 product family consists of four monolithic clock-tunable filter building blocks. Each product contains four matched, low noise, high accuracy 2nd order switched- capacitor filter sections. An external clock tunes the center frequency of each 2nd order filter section. The LTC1068 products differ only in their clock-to-center frequency ratio. The clock-to-center frequency ratio is set to 200:1 (LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or 25:1 (LTC1068-25). External resistors can modify the clock-to-center frequency ratio. High performance, quad 2nd order, dual 4th order or 8th order filters can be designed with an LTC1068 family product. Designing filters with an LTC1068 product is fully supported by FilterCAD TM filter design software for Windows®. The LTC1068 products are available in a 28-pin SSOP surface mount package. A customized version of an LTC1068 family product can be obtained in a 16-lead SO package with internal thin-film resistors. Please contact LTC Marketing for details. DESCRIPTIO FilterCAD is a trademark of Linear Technology Corporation. Windows is a registered trademark of Microsoft Corporation. , LTC and LT are registered trademarks of Linear Technology Corporation. S APPLICATI APPLICATI TYPICAL Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up to 200kHz f – 3dB = fCLK/25, 4th Order Filter Noise = 60µVRMS INV B HPB/NB BPB LPB SB NC AGND V + NC SA LPA BPA HPA/NA INVA 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 INV C HPC/NC BPC LPC SC V – NC CLK NC SD LPD BPD HPD/ND INVD LTC1068-25 R31 20k R33 20k R23 14k R13 20k 0.1 µF R21 14k R22 20k R12 14k R32 10k R34 10k R24 20k R14 14k R11 20k VIN1 VIN2 5V 1 µF VOUT1 VOUT2 1068 TA20a –5V fCLK = (25)(f – 3dB) RELATIVE FREQUENCY [fIN/(f – 3dB)] 0.1 –10 –20 –30 –40 –50 –60 –70 –80 110 1068 TA20b 10 0 Gain vs Frequency s Lowpass or Highpass Filters: LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to 50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25, 4Hz to 200kHz s Bandpass or Bandreject (Notch) Filters: LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to 30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25, 4Hz to 140kHz |
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