LTC1065 DC Accurate, Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter DESCRIPTIO FEATURES Clock-Tunable Cutoff Frequency The LTC 1065 is the first monolithic filter providing both 1mV DC Offset (Typical) clock-tunability with low DC output offset and over 12-bit 80dB CMR (Typical) DC accuracy. The frequency response of the LTC1065 Internal or External Clock closely approximates a 5th order Bessel polynomial. With 50V Clock Feedthrough appropriate PCB layout techniques the output DC offset is RMS 100:1 Clock-to-Cutoff Frequency Ratio typically 1mV and is constant over a wide range of clock 80V Total Wideband Noise frequencies. With 5V supplies and 4V input voltage RMS 0.004% Noise + THD at 2V Output Level range, the CMR of the device is typically 80dB. RMS 50kHz Maximum Cutoff Frequency The filter cutoff frequency is controlled either by an inter- Cascadable for Faster Roll-Off nal or external clock. The clock-to-cutoff frequency ratio is Operates from 2.375 to 8V Power Supplies 100 :1. The on-board clock is nearly power supply inde- Self-Clocking with 1 RC pendent and it is programmed via an external RC. The Available in 8-Pin DIP and 16-Pin SW Packages 50V clock feedthrough of the device is considerably RMS U lower than other existing monolithic filters. APPLICATIO S The LTC1065 wideband noise is 80V and it can RMS Audio process large AC input signals with low distortion. With Strain Gauge Amplifiers 7.5V supplies, for instance, the filter handles up to Anti-Aliasing Filters 4V (94dB S/N ratio) while the standard 1kHz THD is RMS Low Level Filtering below 0.005% 87dB dynamic range (S/N + THD) is ob- Digital Voltmeters tained with input levels between 2V and 2.5V . RMS RMS Smoothing Filters The LTC1065 is available in 8-pin miniDIP and 16-pin SW Reconstruction Filters packages. For a Butterworth response, see LTC1063 data , LTC and LT are registered trademarks of Linear Technology Corporation. sheet. The LTC1065 is pin compatible with the LTC1063. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 4857860. TYPICAL APPLICATIO Frequency Response 10 3.4kHz Single 5V Supply Bessel Lowpass Filter 0 5V 10 1 8 20 V IN 4.99k 30 2 7 V OUT + 40 LTC1065 1F 4.53k 0.1F 3 6 5V TANT 50 0.1F 5 4 60 70 13k* 200pF* 80 * SELF-CLOCKING SCHEME 1065 TA01 90 1 10 100 FREQUENCY (kHz) 1065 TA01b 1065fb 1 GAIN (dB) U ULTC1065 ABSOLUTE AXI U RATI GS (Note 1) + Operating Temperature Range (Note 7) Total Supply Voltage (V to V ) .......................... 16.5V LTC1065C .............................................. 0C to 70C Power Dissipation............................................. 400mW + LTC1065I........................................... 40C to 85C Voltage at Any Input .... (V 0.3V) V (V + 0.3V) IN LTC1065M (OBSOLETE).................. 55C to 125C Burn-In Voltage ...................................................... 16V Lead Temperature (Soldering, 10 sec)................. 300C Storage Temperature Range ................ 65C to 150C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW ORDER PART ORDER PART NUMBER NUMBER V 1 8 V ADJ 16 IN OS NC 1 V ADJ OS 15 V 2 NC GND 2 7 V IN OUT + 14 GND 3 V OUT V 3 6 V LTC1065CN8 LTC1065CSW 13 NC 4 NC CLK OUT 4 5 CLK IN LTC1065IN8 + LTC1065ISW 12 V 5 V N8 PACKAGE 11 NC 6 NC 8-LEAD PLASTIC DIP 10 T = 100C, = 110C/W (N) NC 7 NC JMAX JA 9 CLK OUT 8 CLK IN J8 PACKAGE LTC1065MJ8 8-LEAD CERAMIC DIP SW PACKAGE T = 150C, = 100C/W (J) JMAX JA 16-LEAD PLASTIC SO WIDE OBSOLETE PACKAGE T = 100C, = 85C/W JMAX JA Consider the N Package for an Alernate Source Order Options Tape and Reel: Add TR Lead Free: Add PBF, Lead Free Tape and Reel: Add TRPBF, Lead Free Part Marking: