LTM450U 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 LTM450BU LTM450CU LTM450DU LTM450EU LTM450FU LTM450GU LTM450HU LTM450IU LTM450HTU LTM450ITU 450 450 450 450 450 450 450 450 450 450 ±2.0 ±2.0 ±1.5 ±1.5 ±1.5 ±1.0 ±1.0 ±1.0 ±1.0 ±1.0 INSERTION LOSS (dB) MAX. PASS BAND RIPPLE (dB) MAX. 6 dB BANDWIDTH (KHz) MIN. 40 dB BANDWIDTH (dB) MAX. 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 STOP BAND ATT. ±100KHZ (dB) MIN. INPUT / OUTPUT IMPEDANCE (Ω) 27 27 27 27 27 25 25 25 35 35 1500 1500 1500 1500 2000 2000 2000 2000 2000 2000 PACKAGE DIMENSIONS (mm) 7 7 INPUT R1 OUTPUT 2 1 6.5 LTMU 3 Rg GROUND 4 GROUND R2 4 S.S.G. 0.8 2 1 Rg+R1=R2=input/output impedance 4.3 2.4 1.8 0.8 Figure 2) LTM450U – Measuring Circuit Connection 0 2 Output LTM455BU 10 3 Ground Attenuation (dB) 4 4.3 1 Input 3 RF V.M. 4 Ground 2.4 1.8 0.8 LTM455EU 20 LTM455HU 30 40 50 Figure 1) LTM450U – Front, Side and Bottom views 60 410 420 430 440 450 460 470 480 490 500 Frequency (KHz) 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). Figure 3) LTM4550U – Characteristics ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM CERAMIC FILTERS 78 CERAMIC FILTERS