LTC1064-1 Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter FEATURES DESCRIPTIO The LTC 1064-1 is an 8th order, clock sweepable elliptic 8th Order Filter in a 14-Pin Package (Cauer) lowpass switched capacitor filter. The passband No External Components ripple is typically 0.15dB, and the stopband attenuation 100:1 Clock to Center Ratio at 1.5 times the cutoff frequency is 68dB or more. 150V Total Wideband Noise RMS 0.03% THD or Better An external TTL or CMOS clock programs the value of the 50kHz Maximum Corner Frequency filters cutoff frequency. The clock to cutoff frequency ratio Operates from 2.37V to 8V Power Supplies is 100:1. Passband Ripple Guaranteed Over Full Military No external components are needed for cutoff frequencies Temperature Range up to 20kHz. For cutoff frequencies over 20kHz two low U value capacitors are required to maintain passband flatness. APPLICATIO S The LTC1064-1 features low wideband noise and low harmonic distortion even for input voltages up to 3V . RMS Antialiasing Filters In fact the LTC1064-1 overall performance completes with Telecom PCM Filters equivalent multiple op amp RC active realizations. The LTC1064-1 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-1 is pin compatible with the LTC1064-2. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Elliptic Antialiasing Filter Frequency Response 15 1 14 INV C R(h, I) 0 2 13 V V COMP2* IN IN 15 3 12 AGND V 8V 30 LTC1064-1 4 11 0.1F + CLOCK V f 8V CLK 45 (TTL, 5MHz) 0.1F 5 10 AGND NC 60 6 9 COMP1* V V 75 OUT OUT 7 8 90 INV A NC 105 1064 TA01 0451105 2025 30350 NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1F FREQUENCY (kHz) CAPACITOR CLOSE TO THE PACKAGE. 1064 TA02 FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND 8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING STAGE SUMMING JUNCTION. FILTER MAINTAINS, FOR 0.1Hz f 10kHz, A 0.15dB PASSBAND CUTOFF *FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5 f . CUTOFF CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1 TOTAL WIDEBAND NOISE = 150V , THD = 0.03% FOR V = 1V RMS IN RMS AND PIN 6 AND PIN 7. 10641fa 1 V /V (dB) OUT IN U ULTC1064-1 ABSOLUTE AXI U RATI GS (Note 1) + Total Supply Voltage (V to V ) ............................ 16.5V Operating Temperature Range Power Dissipation.............................................. 400mW LTC1064-1M (OBSOLETE) ............... 55C to 125C Storage Temperature Range ................. 65C to 150C LTC1064-1C/AC.................................. 40C to 85C Lead Temperature (Soldering, 10 sec).................. 300C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART 1 R(h, l) INV C 14 TOP VIEW NUMBER NUMBER 2 COMP2 V 13 IN INV C 1 16 R(h, l) 3 V AGND 12 LTC1064-1CN LTC1064-1CSW V 2 15 COMP2 IN + 4 f V 11 CLK LTC1064-1ACN AGND 3 14 V 5 NC AGND 10 + 4 V 13 NC 6 V COMP1 9 OUT 5 AGND 12 f CLK 7 NC INV A 8 6 NC 11 NC 7 COMP1 10 NC N PACKAGE 14-LEAD PDIP 8 9 INV A V OUT T = 110C, = 70C/W JMAX JA J PACKAGE SW PACKAGE 14-LEAD CERDIP 16-LEAD PLASTIC (WIDE) SO LTC1064-1MJ LTC1064-1CJ T = 150C, = 90C/W JMAX JA OBSOLETE PACKAGE Consider the N14 Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 7.5V, f = 1MHz, R1 = 10k, C1 = 10pF, TTL or CMOS clock input A S CLK level unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS Passband Gain, LTC1064-1, 1A Referenced to 0dB, 1Hz to 0.1f 0.1 0.35 dB C Gain TempCo 0.0002 dB/C Passband Edge Frequency, f 10 1% kHz C Gain at f Referenced to Passband Gain C LTC1064-1 1.25 0.85 dB LTC1064-1A 0.75 0.65 dB 3dB Frequency 10.7 kHz Passband Ripple (Note 1) 0.1f to 0.85f Referenced to Passband Gain, C C LTC1064-1 Measured at 6.25kHz and 8.5kHz 0.15 0.32 dB LTC1064-1A 0.1 0.19 dB Ripple TempCo 0.0004 dB/C Stopband Attenuation At 1.5f Referenced to 0dB C LTC1064-1 66 72 dB LTC1064-1A 68 72 dB Stopband Attenuation At 2f Referenced to 0dB C LTC1064-1 67 72 dB LTC1064-1A 68 72 dB 10641fa 2 U WWW