LTC1064-3CJ

LTC1064-3 Low Noise, High Frequency, 8th Order Linear Phase Lowpass Filter FEATURES ■ ■ ■ ■ DESCRIPTIO ■ ■ ■ ■ 8th Order Filter in a 14-Pin Package 95kHz Maximum Corner Frequency No External Components 75:1, 150:1 and 120:1 Clock to Cutoff Frequency Ratio 60µVRMS Total Wideband Noise 0.03% THD or Better Operates from ±2.37V to ±8V Power Supplies Low Total Output DC Offset The LTC®1064-3 is a monolithic 8th order lowpass Bessel filter, which provides a linear phase response over its entire passband. An external TTL or CMOS clock programs the filter’s cutoff frequency. The clock to cutoff frequency ratio is 75:1 (Pin 10 at V+) or 150:1 (Pin 10 at V–) or 120:1 (Pin 10 at GND). The maximum cutoff frequency is 95kHz. No external components are needed. The LTC1064-3 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-3 overall performance competes with equivalent multiple op amp RC active realizations. The LTC1064-3 is available in a 14-pin DIP or 16-pin surface mounted SOL package. The LTC1064-3 is fabricated using LTC’s enhanced analog CMOS Si-gate process. The LTC1064-3 is pin compatible with the LTC1064-1, LTC1064-2 and LTC1064-4. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S ■ ■ ■ Antialiasing Filters Smoothing Filters Tracking High Frequency Lowpass Filters TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Bessel Filter 1 VIN 2 3 4 5 6 7 NC VIN OUT C NC 14 13 –8V CLOCK = 7MHz 0.1µF Measured Frequency Response 0 –15 –30 VOUT/VIN (dB) LTC1064-3 12 V– AGND V+ AGND NC INV A fCLK 75/150 VOUT NC 11 –45 –60 –75 8V 0.1µF 10 + V 9 8 VOUT 1064 TA01a –90 VS = ± 7.5V, fCLK = 7MHz, PIN 10 TO V +, f –3dB = 95kHz, GROUP DELAY = 6µs –105 100 10 FREQUENCY (kHz) NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF OR LARGER CAPACITOR CLOSE TO THE PACKAGE. THE CONNECTI0N BETWEEN PIN 7 AND PIN 14 SHOULD BE MADE UNDER THE IC PACKAGE. U 1000 1064-3 TA01b U U 10643fa 1 LTC1064-3 ABSOLUTE AXI U RATI GS Total Supply Voltage (V + to V –) ............................ 16.5V Power Dissipation .............................................. 400mW Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C PACKAGE/ORDER I FOR ATIO TOP VIEW NC VIN AGND V+ AGND NC RIN A 1 2 3 4 5 6 7 14 OUT C 13 NC 12 V– ORDER PART NUMBER NC 1 2 3 4 5 6 7 8 LTC1064-3CN 11 fCLK 10 75/150 9 8 VOUT NC N PACKAGE 14-LEAD PDIP TJMAX = 110°C, θJA = 70°C/W J PACKAGE 14-LEAD CERDIP OBSOLETE PACKAGE Consider the N 14 Package for Alternate Source LTC1064-3MJ LTC1064-3CJ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS PARAMETER Passband Gain Gain TempCo –3dB Frequency Gain at –3dB Frequency Stopband Attenuation Stopband Attenuation Stopband Attenuation Input Frequency Range Output Voltage Swing and Operating Input Voltage Range Total Harmonic Distortion Wideband Noise CONDITIONS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ± 7.5V, 75:1, fCLK = 2MHz, R1 = 10k, TTL or CMOS clock input level unless otherwise specified. MIN ● Referenced to 0dB, 1Hz to 1kHz 50:1 (fCLK /f –3dB = 75) 100:1 (fCLK /f –3dB = 150) Referenced to 0dB, fIN = 26.67/13.34kHz At 3f –3dB At 5f –3dB At 7f –3dB 100:1 50:1 VS = ±2.37V VS = ±5V VS = ±7.5V VS = ±5V, Input = 1VRMS at 1kHz VS = ±7.5V, Input = 3VRMS at 1kHz VS = ±5V, Input = GND 1Hz – 1.99MHz VS = ±7.5V, Input = GND 1Hz – 1.99MHz 2 U U W WW U W (Note 1) Operating Temperature Range LTC1064-3M (OBSOLETE) ............... – 55°C to 125°C LTC1064-3C ....................................... – 40°C to 85°C Input Voltage ........................... (V+ +0.3V) to V – – 0.3V) Burn-In Voltage ....................................................... 15V TOP VIEW 16 OUT C 15 NC 14 V – 13 NC 12 fCLK 11 75/150 10 NC 9 VOUT ORDER PART NUMBER LTC1064-3CSW VIN AGND V+ AGND NC NC RIN A SW PACKAGE 16-LEAD PLASTIC (WIDE) SO TJMAX = 150°C, θJA = 90°C/W TYP 0.0002 26.67 13.34 MAX 0.15 UNITS dB dB/°C kHz kHz dB dB dB dB kHz kHz V V V –0.5 ● ● ● –3.8 –25 –56 0 0 –2.75 –29 –60 –84