DELAY (ns) LTC1566-1 Low Noise 2.3MHz Continuous Time Lowpass Filter FEATURES DESCRIPTIO 7th Order, 2.3MHz Lowpass Filter in an SO-8 The LTC 1566-1 is a 7th order continuous time lowpass 62V Input Referred Noise filter with 12dB of passband gain. The selectivity, linearity RMS Operates on a Single 5V or a 5V Supply and dynamic range makes the LTC1566-1 suitable for Differential Inputs and Outputs filtering in data communications or data acquisition Low Offset (3mV typical, 10mV ) systems. The filter attenuation is 40dB at 1.5 f and MAX CUTOFF Adjustable Output Common Mode Voltage at least 60dB for frequencies above 10MHz. 40dB Attenuation at 1.5 f CUTOFF The LTC1566-1 has an input referred noise of 62V in RMS Requires No External Components a 2MHz bandwidth. In receiver applications where the signal levels are small, the filter features 71dB of spurious U free dynamic range. APPLICATIO S With 5% accuracy of the cutoff frequency, the LTC1566-1 WCDMA Basestations can be used in applications requiring pairs of matched Communication Filters filters, such as transceiver I and Q channels. Antialiasing Filters Smoothing or Reconstruction Filters The differential inputs and outputs provide a simple inter- Matched Filter Pairs face for wireless systems. The high impedance inputs are Replacement for LC Filters easily coupled to differential demodulators or D/A con- verters. The output DC common mode voltage and output DC offset voltage are adjustable so the signal path can be optimized for driving an A/D converter or differential modulator. Other cutoff frequencies and single-ended I/O can be , LTC and LT are registered trademarks of Linear Technology Corporation. provided upon request. Please contact LTC Marketing. TYPICAL APPLICATIO Frequency Response 20 1000 GAIN Single 5V Supply, Differential 10 900 2.3MHz Lowpass Filter 0 800 10 700 1 8 + + + IN + OUT 20 600 LTC1566-1 V V IN OUT 30 DELAY 500 2 7 IN OUT 40 400 50 300 3 6 + GND 5V V 60 200 10k 0.1F 10k 0.1F 70 100 4 5 V V ODC 80 0 0.1 1.0 10 100 FREQUENCY (MHz) 1566-1 TA01 1566-1 G01 15661fa 1 GAIN (dB) U ULTC1566-1 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART TOP VIEW Total Supply Voltage ................................................ 11V NUMBER + + IN 1 8 OUT Power Dissipation.............................................. 500mW IN 2 7 OUT Operating Temperature Range LTC1566-1CS8 + GND 3 6 V LTC1566-1CS .......................................... 0C to 70C LTC1566-1IS8 V 4 5 V ODC LTC1566-1IS ...................................... 40C to 85C S8 PART MARKING Storage Temperature Range ................. 65C to 150C S8 PACKAGE 8-LEAD PLASTIC SO Lead Temperature (Soldering, 10 sec).................. 300C 15661 T = 125C, = 80C/W JMAX JA (Note 4) 15661I Consult factory 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 = 5V (V = 5V, V = 0V), R = 10k from each output to AC ground, A S LOAD Pin 5 connected to Pin 3, Pin 3 biased to mid supply, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS Filter Gain, V = 5V V = 0.25V f = 20kHz to 100kHz 11.8 12.1 12.3 dB S IN P-P IN f = 1.8MHz (Gain Relative to 100kHz) 0.35 0 0.8 dB IN f = 2MHz (Gain Relative to 100kHz) 0.85 0.1 0.8 dB IN f = 2.3MHz (Gain Relative to 100kHz) 7.5 3 0.95 dB IN f = 3MHz (Gain Relative to 100kHz) 22 17 dB IN f = 5MHz (Gain Relative to 100kHz) 42 dB IN f = 10MHz (Gain Relative to 100kHz) 62 dB IN Filter Phase, V = 5V V = 0.25V f = 900kHz 165 150 135 deg S IN P-P IN f = 1.8MHz 330 285 265 deg IN Phase Linearity, V = 5V Ratio of phases: 1.8MHz/900kHz 1.9 1.95 2.05 S Filter Gain, V = 5V V = 0.25V f = 20kHz to 100kHz 11.9 12.1 12.3 dB S IN P-P IN f = 900kHz (Gain Relative to 100kHz) 0.2 0 0.2 dB IN f = 1.8MHz (Gain Relative to 100kHz) 0.3 0.1 0.9 dB IN f = 2MHz (Gain Relative to 100kHz) 0.55 0.1 0.75 dB IN f = 2.3MHz (Gain Relative to 100kHz) 6 2 0.3 dB IN f = 3MHz (Gain Relative to 100kHz) 20 16 dB IN f = 5MHz (Gain Relative to 100kHz) 41 dB IN f = 10MHz (Gain Relative to 100kHz) 61 dB IN Input Referred Wideband Noise Noise BW = 50kHz to 2MHz 62 V RMS THD f = 100kHz, V = 2V (Note 2) 80 dB IN OUT P-P Filter Differential DC Swing Maximum Difference Between Pins 7 and Pin 8 V = 5V 1.3 1.7 V S P with Pin 5, Pin 3 Biased to Mid Supply V = 5V 2.7 2.9 V S P Input Bias Current 300 600 nA Input Offset Current 10 nA Input Resistance Common Mode, V = 1.5V to 3.5V 70 M IN Differential 140 M Input Capacitance 2pF Output DC Offset V = 5V 3 10 mV S (Notes 3, 5) V = 5V 3 10 mV S 15661fa 2 U WWW