MC33120P

The MC33120P is a type of subscriber loop interface circuit, which is designed to offer the interface between 4-wire side of a central office, or PBX, and the 2-wire subscribe line. Interface functions consist of battery feed, proper loop termination AC impedance, hooolswitch detection, adjustable transmit, receive, and transhybird gains, and single/ double fault indication. What's more, the MC33120P offers a minimum of 58 dB of longitudinal balance.

Features of the MC33120P are:(1)58dB longitudinal balance guaranteed:4-wire and 2-wire;(2)transmit, receive and transhybird gain externally adjustable;(3)proper loss externally adjustable;(4)proper hook switch detection with 30 k leakage;(5)single/double fault indication with shutdown for terminal protection;(6)critical sense supplies:42V to-58V and +5.0V,±10%;(7)on-hook transmission;(8)operating ambient temperature:-40 to+85.

The absolute maximum ratings and electrical characteristics of the MC33120P can be summarized as:(1)supply volta ge: with repect toVCC is -60Vcd to+0.5Vdc,with respect to VDG is-0.5Vdc to+7.0Vdc;(2)input voltage: PDI, with resp ect to VDG is -0.5Vdc to7.0Vdc;(3):storage temperature ranges from-65 to 150;(4):junction temperature is 150 .electrical characteristics:(1):VEE current on hook(RL>10M,VEE is -58V) is -2.7mA min and -1.2mA typ;(2):VDD curr ent on hook(RL>10M,VEE is +5.5V) is 1.4mA typ and 2.7mA max;(3)VEE ripple rejection (f=1.0KHz,at Vtx) is 40dB min and 62dB typ. etc.