LTM455U SERIES 4 ELEMENT CERAMIC FILTER Ultra small size high selectivity type ceramic filter for communication use. FEATURES • Ultra small size • 6.5 mm profile • Bandwidths from 4KHz to 30KHz available • RoHS Compliant (Note 7 exemption) • 4 elements OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS CENTER FREQUENCY (KHz) PART NUMBER LTM455BU LTM455CU LTM455DU LTM455EU LTM455FU LTM455GU LTM455HU LTM455IU LTM45HTU LTM45ITU 455 455 455 455 455 455 455 455 455 455 INSERTION LOSS (dB) MAX. PASS BAND RIPPLE (dB) MAX. 6 dB BANDWIDTH (KHz) MIN. 40 dB BANDWIDTH (dB) MAX. STOP BAND ATT. ±100KHZ (dB) MIN. INPUT / OUTPUT IMPEDANCE (Ω) 4 4 4 6 6 6 6 6 6 6 2 2 2 2 2 2 2 2 2 2 ±15 ±12.5 ±10 ±7.5 ±6 ±4.5 ±3 ±2 ±3 ±2 ±30 ±24 ±20 ±15 ±12.5 ±10 ±9 ±7.5 ±9 ±7.5 27 27 27 27 27 25 25 25 35 35 1500 1500 1500 1500 2000 2000 2000 2000 2000 2000 ±2.0 ±2.0 ±1.5 ±1.5 ±1.5 ±1.0 ±1.0 ±1.0 ±1.0 ±1.0 PACKAGE DIMENSIONS (mm) 7 7 R1 INPUT OUTPUT 1 2 LTMU 6.5 3 Rg GROUND 4 GROUND R2 4 S.S.G. 0.8 Figure 2) LTM455U – Measuring Circuit 0 2 1 Rg+R1=R2=input/output impedance 4.3 2.4 1.8 0.8 Connection Attenuation (dB) 4.3 4 LTM455BU 10 1 Input 3 RF V.M. 2 Output 3 Ground 4 Ground LTM455EU 20 LTM455HU 30 40 50 2.4 1.8 0.8 60 410 420 430 440 450 460 470 480 490 500 Figure 1) LTM455U – Front, Side and Bottom views Frequency (KHz) Figure 3) LTM455U – Characteristics Note: To avoid potential problems, connect the output to an IF amplifier through a DC cut capacitor. Avoid applying a direct current to output end of the ceramic filters (between ➂ and ①②). ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM CERAMIC FILTERS 80 CERAMIC FILTERS