LTC1064 Linear Technology, LTC1064 Datasheet
LTC1064
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LTC1064 Summary of contents
Page 1
... 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 includ- ing internal thin film resistors can be obtained for high volume applications. Consult LTC Marketing for details. ...
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... LTC1064 ABSOLUTE MAXIMUM + – Total Supply Voltage ( ............................. 16V Power Dissipation............................................. 500mW Operating Temperature Range LTC1064AC/LTC1064C.................... – LTC1064AM/LTC1064M ................ – 125 C U PACKAGE/ORDER INFORMATION TOP VIEW INV B 1 INV C 24 HPB/ HPC/NC BPB 3 22 BPC LPB 4 21 ...
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... LTC1064 LTC1064A (Note 1) Clock-to-Center Frequency LTC1064 Ratio, Side-to-Side Matching LTC1064A (Note 1) Clock-to-Center Frequency LTC1064 Ratio (Note 2) LTC1064A (Note 1) CLK O LTC1064 LTC1064 A (Note 1) Q Accuracy f Temperature Coefficient O Q Temperature Coefficient DC Offset Voltage V (Table 1) OS1 V (Table 1) OS2 V (Table 1) OS3 ...
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... LTC1064 W BLOCK DIAGRA INV A – (12) AGND + (6) INV B – (1) + INV C – (24) + INV D – (13 TYPICAL PERFORMANCE CHARACTERISTICS Mode 50:1 CLK 2. 7. – 2. ...
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... CENTER FREQUENCY (kHz) Harmonic Distortion, 8th Order LP Butterworth, f THD = 0.015% for 3V – 125 – – 1064 G10 LTC1064 Mode 50:1 CLK O T – 2. 7.5V ...
Page 6
... AGND (Pin 6): Analog Ground. When the LTC1064 oper- ates with dual supplies, Pin 6 should be tied to system ground. When the LTC1064 operates with a single positive supply, the analog ground pin should be tied to 1/2 supply and it should be bypassed with solid tantalum in parallel with a 0.1 F ceramic capacitor, Figure 1. The ...
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... U U APPLICATIONS INFORMATION ANALOG CONSIDERATIONS Grounding and Bypassing The LTC1064 should be used with separated analog and digital ground planes and single point grounding techniques. Pin 6 (AGND) should be tied directly to the analog ground plane. + Pin should be bypassed to the ground plane with a 0.1 F ceramic capacitor with leads as short as possible. – ...
Page 8
... Mode 1 is faster than Mode 3. Note that Mode 1 can only be implemented with three of the four LTC1064 sections because Section D has no externally available summing node. Section D, however, can be internally connected in Mode 1 upon special request ...
Page 9
... Mode 3 is the second of the primary modes. In Mode 3, the ratio of the external clock frequency to the center fre- quency of each 2nd order section can be adjusted above or below 50:1 or 100:1. Side D of the LTC1064 can only be connected in Mode 3. Figure 6 illustrates Mode 3, the classical state variable configuration, providing highpass, bandpass and lowpass 2nd order filter functions ...
Page 10
... Mode 3a is more versatile than Mode 2 because the notch frequency can be higher or lower than the center frequency of the 2nd order section. The external op amp of Figure 9 is not always required. When cascading the sections of the LTC1064, the highpass and lowpass out ...
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... F CLK f CLK 17 R44 16 LPD R34 15 BPD R24 14 R14 13 V IN4 17.4k 20k 20k – LT1056 + R43 = 17.8k R44 = 40.2k LTC1064 Amplitude Response CLK –15 –30 – 2MHz CLK –60 –75 – –105 10k 100k INPUT FREQUENCY (Hz) Amplitude Response 2MHz CLK 0 – ...
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... CERAMIC CAPACITOR, RIGHT AT THE PINS. NOTE 2: THE RATIOS OF ALL (R2/R4) RESISTORS SHOULD BE MATCHED TO BETTER THAN 0.25%. THE REMAINING RESISTORS SHOULD BE BETTER THAN 0.5% ACCURATE. C-Message Filter 1 INV B R22 2 HPB/NB R32 3 BPB R42 4 LPB AGND LTC1064 0.1 F R12 8 SA R41 9 LPA R31 10 BPA R21 11 HPA/NA R11 12 ...
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... ELLIPTIC ANTIALIASING FILTER MAINTAINS, FOR 0.1Hz f 20kHz, A 0.1dB MAX CUTOFF PASSBAND ERROR AND 72dB MIN STOPBAND ATTENUATION AT 1 CUTOFF TOTAL WIDEBAND NOISE = 150 V , RMS THD = 70dB (0.03%) FOR RMS 100:1. THIS FILTER AVAILABLE CLK CUTOFF AS LTC1064-1 WITH INTERNAL THIN FILM RESISTORS. 1064 TA14 13 ...
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... R34 = 6.8k WIDEBAND NOISE = 64 V RMS 8th Order Linear Phase (Bessel) Filter with R11 1 INV B V IN1 R21 2 HPB/NB HPC/NC R31 3 BPB R41 4 LPB AGND LTC1064 0 50/100 9 LPA R43 10 BPA R33 11 HPA/NA R13 R23 FROM 12 INV A PIN 20 RESISTOR VALUES: R11 = 34 ...
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... R = 68.1k LT1056 10k (0.1 10k (0.1%) H4 1064 TA21 COMMENT Three Filter Building Blocks in a 20-Pin Package Low Noise, Low Power Pin-for-Pin LTC1064 Compatible Up to 250kHz Center Frequency LTC1064 Amplitude Response 15 PASSBAND RIPPLE = 0.2dB 0 – 15 –30 –45 –60 –75 –90 –105 10k ...
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... LTC1064 PACKAGE DESCRIPTION CORNER LEADS OPTION 0.045 – 0.068 J Package (1.143 – 1.727) FULL LEAD 24-Lead Ceramic DIP OPTION N Package 24-Lead Plastic DIP NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS ...