DDS Applications Pulse Transformers Compatible with Level One transceiver ICs Low Profile "Touch Tone" Designs Surface Mount Designs Electrical Specifications at 25OC Parameter Turns Ratio T-710 T-997 * T-998 * 1:1 + 1% 1:1 + 1% 1:1 + 1% 135 135 143 100 Ω on Sec. Pri. Impedance Longitudinal Balance 200 - 1000 Hz 15 kHz Pri. DC Resistance Sec. DC Resistance Frequency Response 100Hz - 112kHz Frequency Response 1 kHz - 200kHz Insertion Loss 10kHz Ω 40 typ. 35 typ. 40 typ. 35 typ. dB dB 19.5 max. 18.2 typ. 2.9 typ. Ω 19.5 max. 18.2 typ. 5.9 typ. Ω 1.0 typ. 1.0 typ. --- dB --- --- 1.0 max. dB 1.25 max. 1.25 typ. 0.50 typ. dB 1500 1875 1875 VRMS 0 0 0 mA Primary DC 1 kHz & 1VRMS 200 min. 200 min. 40 min. mH 10 kHz & 0.5VRMS 43 max. 60 max. 40 max. µH 10 kHz & 1VRMS 65 max. 65 max. 65 max. pF Return Loss 100Hz to 100kHz 15 min. 15 typ. --- dB Return Loss 1 kHz - 200kHz --- --- 15 typ. dB RS14X8 EP13 * EP13 * Leakage Inductance Interwinding Capacitance Package Type T-710 SCHEMATIC Units 60 min. 40 min. Isolation (HI-POT) Inductance Designed to meet the requirements of Bellcore TR-NWT-000499, Synchronous Digital Data Interface-64 Kbps and Subrates PRI. SEC. 6 3 5 4 1 T-997 & T-998 SCHEMATIC PRI. SEC. 1 10 3 8 5 6 T-710 & T-997 Recommended for use with Level One LXT400 & LXT456 T-998 Recommended for use with Level One LXT441 * Surface Mount Version Available for T-997 & T-998. Add suffix "G" (i.e. T-997G or T-998G) See EP13-SMD drawing page 21 (T-976G) T-997 & T-998: EP13 Package Physical Dimensions Inches (mm) T-710: RS-1408 Package PIN POSITION GRID 0.100 (2.54) HOLES FOR BOBBIN PINS HOLES FOR CLIPS 10 6 Bottom View 1 5 For Complete Details including PDF Catalogs & Data Sheets on this and other product families visit www.rhombus-ind.com Specifications subject to change without notice. Rhombus Industries Inc. For other values & Custom Designs, contact factory. 19 DDS - 2/98 15801 Chemical Lane, Huntington Beach, CA 92649-1595 Tel: (714) 898-0960 • Fax: (714) 896-0971