Document
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
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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.