LTC1069-6CS8#PBF

LTC1069-6 Single Supply, Very Low Power, Elliptic Lowpass Filter FEATURES DESCRIPTION n The LTC®1069-6 is a monolithic low power, 8th order lowpass filter optimized for single 3V or single 5V supply operation. The LTC1069-6 typically consumes 1mA under single 3V supply operation and 1.2mA under 5V operation. n n n n n n n n n n 8th Order Elliptic Filter in SO-8 Package Single 3V Operation: Supply Current: 1mA (Typ) fCUTOFF: 14kHz (Max) S/N Ratio: 72dB Single 5V Operation: Supply Current: 1.2mA (Typ) fCUTOFF: 20kHz (Max) S/N Ratio: 79dB ± 0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ) 42dB Attenuation at 1.3fCUTOFF 66dB Attenuation at 2.0fCUTOFF 70dB Attenuation at 2.1fCUTOFF Wide Dynamic Range, 75dB or More (S/N + THD), Under Single 5V Operation Wideband Noise: 120µVRMS Clock-to-fCUTOFF Ratio: 50:1 Internal Sample Rate: 100:1 APPLICATIONS n n n n n n The cutoff frequency of the LTC1069-6 is clock tunable and it is equal to the clock frequency divided by 50. The input signal is sampled twice per clock cycle to lower the risk of aliasing. The typical passband ripple is ± 0.1dB up to 0.9fCUTOFF . The gain at fCUTOFF is –0.7dB. The transition band of the LTC1069-6 features progressive attenuation reaching 42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum stopband attenuation is 72dB. The LTC1069-6 can be clock tuned for cutoff frequencies up to 20kHz (single 5V supply) and for cutoff frequencies up to 14kHz (single 3V supply). The low power feature of the LTC1069-6 does not penalize the device’s dynamic range. With single 5V supply and an input range of 0.4VRMS to 1.4VRMS , the Signal-to(Noise + THD) ratio is ≥70dB. The wideband noise of the LTC1069-6 is 125μVRMS . Handheld Instruments Telecommunication Filters Antialiasing Filters Smoothing Filters Audio Multimedia Other filter responses with higher speed can be obtained. Please contact LTC Marketing for details. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. The LTC1069-6 is available in an 8-pin SO package. TYPICAL APPLICATION Frequency Response 10 VIN = 500mVRMS 0 Single 3V Supply 10kHz Elliptic Lowpass Filter –20 VOUT GAIN (dB) AGND 3V V+ 0.47μF 0.1μF V– LTC1069-6 NC NC VIN CLK –10 –30 –40 –50 –60 fCLK = 500kHz –70 1069-6 TA01 –80 5 10 20 15 FREQUENCY (kHz) 25 1069-6 TA02 10696fa 1 LTC1069-6 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION Total Supply Voltage (V + to V –) ................................12V Operating Temperature Range LTC1069-6C ............................................. 0°C to 70°C LTC1069-6I ..........................................– 40°C to 85°C Storage Temperature..............................– 65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C TOP VIEW AGND 1 8 VOUT V+ 2 7 V– NC 3 6 NC VIN 4 5 CLK S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, θJA = 130°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1069-6CS8#PBF LTC1069-6CS8#TRPBF 10696 8-Lead Plastic SO 0°C to 70°C LTC1069-6IS8#PBF LTC1069-6IS8#TRPBF 10696I 8-Lead Plastic SO –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or fall time ≤ 1µs) RL = 10k, VS = 5V, TA = 25°C, unless otherwise specified. All AC gains are measured relative to the passband gain. SYMBOL CONDITIONS Passband Gain (fIN ≤ 0.2fCUTOFF) VS = 5V, fCLK = 200kHz fTEST = 0.25kHz, VIN = 1VRMS Gain at 0.50fCUTOFF Gain at 0.75fCUTOFF Gain at 0.90fCUTOFF Gain at 0.95fCUTOFF MIN TYP MAX UNITS l – 0.25 – 0.30 0.1 0.1 0.45 0.50 db db VS = 3V, fCLK = 200kHz fTEST = 0.25kHz, VIN = 0.5VRMS l – 0.25 – 0.30 0.1 0.1 0.45 0.50 db db VS = 5V, fCLK = 200kHz fTEST = 2.0kHz, VIN = 1VRMS l – 0.10 – 0.15 0.07 0.07 0.25 0.30 db db VS = 3V, fCLK = 200kHz fTEST = 2.0kHz, VIN = 0.5VRMS l – 0.15 – 0.20 0.07 0.07 0.25 0.30 db db VS = 5V, fCLK = 200kHz fTEST = 3.0kHz, VIN = 1VRMS l – 0.25 – 0.30 0 0 0.25 0.30 db db VS = 3V, fCLK = 200kHz fTEST = 3.0kHz, VIN = 0.5VRMS l – 0.25 – 0.30 0 0 0.25 0.30 db db VS = 5V, fCLK = 200kHz fTEST = 3.6kHz, VIN = 1VRMS l – 0.25 – 0.25 0.1 0.1 0.45 0.45 db db VS = 3V, fCLK = 200kHz fTEST = 3.6kHz, VIN = 0.5VRMS l – 0.25 – 0.30 0.1 0.1 0.45 0.50 db db VS = 5V, fCLK = 200kHz fTEST = 3.8kHz, VIN = 1VRMS l – 0.35 – 0.45 0.05 0.05 0.25 0.25 db db VS = 3V, fCLK = 200kHz fTEST = 3.8kHz, VIN = 0.5VRMS l – 0.45 – 0.55 0.05 0.05 0.25 0.35 db db 10696fa 2 LTC1069-6 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or fall time ≤ 1µs) RL = 10k, VS = 5V, TA = 25°C, unless otherwise specified. All AC gains are measured relative to the passband gain. SYMBOL CONDITIONS Gain at fCUTOFF VS = 5V, fCLK = 200kHz fTEST = 4.0kHz, VIN = 1VRMS Gain at 1.30fCUTOFF Gain at 2.00fCUTOFF MIN TYP MAX UNITS l – 1.50 – 1.65 –0.07 –0.07 –0.20 –0.25 db db VS = 3V, fCLK = 200kHz fTEST = 4.0kHz, VIN = 0.5VRMS l – 1.5 – 1.7 –0.07 –0.07 0 0 db db VS = 5V, fCLK = 200kHz fTEST = 5.2kHz, VIN = 1VRMS l –42 –42 –40 –39 db db VS = 3V, fCLK = 200kHz fTEST = 5.2kHz, VIN = 0.5VRMS l –41 –41 –38 –37 db db VS = 5V, fCLK = 200kHz fTEST = 8.0kHz, VIN = 1VRMS l –66 –66 –61 –60 db db VS = 3V, fCLK = 200kHz fTEST = 8.0kHz, VIN = 0.5VRMS l –66 –66 –60 –59 db dB 0.15 0 0.5 0.5 db db 175 135 mV mV Gain at 0.95fCUTOFF VS = 5V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 1VRMS VS = 3V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 0.5VRMS Output DC Offset (Note 1) VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz 50 30 Output DC Offset Tempco VS = 5V, VS = 3V 30 μV/°C Output Voltage Swing (Note 2) VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz Power Supply Current VS = 5V, fCLK = 100kHz VS = 3V, fCLK = 100kHz Maximum Clock Frequency – 0.5 – 0.5 l 3.4 3.2 4.2 4.2 VP-P VP-P l 1.6 1.6 2.0 2.0 VP-P VP-P l l VS = 5V VS = 3V 1.60 1.65 mA mA 1 1.40 1.55 mA mA 1 0.7 Input Frequency Range 0 Input Resistance 35 Operating Supply Voltage (Note 3) 3 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The input offset voltage is measured with respect to AGND (Pin 1). The input (Pin 4) is also shorted to the AGND pin. The analog ground pin potential is internally set to (0.437)(VSUPPLY). 1.2 MHz MHz