TBA673

TBA673 II II RING (DE)MODULATOR FOR TELEPHONY AND INDUSTRIAL EQUIPMENT The TBA673 is a monolithic integrated circuit comprising a 4-transistor modulator and demodulator circuit. The four transistors must be as identical as possible; the lay-out has been designed to achieve this and the best possible tracking of the transistor parameters with tempera ture. QUICK REFERENCE DATA Collector cut -off current IE = 0; VCB = 5 V; Tamb = 25 °c Base-emitter voltage differences between transistors 1, 2, 3, 4 VCB = 5 V; -IE = 150 IJA D. C. current gain differences between transistors 1, 2, 3, 4 VCB = 5 V; -IE = 150 IJA leBO !VBEl-VBE2\ /VBE3 -VBE41 IhpBl -hpB2 I IhpB3 -hpB4 ! < 100 <5 <5 < 0,008 < 0,008 nA mV mV PACKAGE OUTLINE TO-74 (reduced height) Dimensions in mm ---- April 1973 II II 1 TBA673 II . CIRCUIT DIAGRAM 3 4 II 10 7 RATINGS Limiting values in accordance with the Absolute Maximum System (IEC 134) Voltages (each transistor) Collector-emitter voltage (open base) E...