DESCRIPTION

The circuit provides DC loop termination for analog trunk lines.

The V-I characteristics is equivalent to a fixed voltage drop (zener like characteristic) in series with an external resistance that determines the slope of the DC characteristic.

An external low voltage electrolytic capacitor causes the circuit to exhibit a very high impedance to all AC signal above a minimum frequency that is determined by the capacitor itself and by a 20 K nominal resistor integrated on the chip.

■ ON CHIP POLARITY GUARD

■ MEETS DC LINE CHARACTERISTICS OF EITHER CCITT AND EIA RS 464 SPECS

■ PULSE FUNCTION

■ HIGH AC IMPEDANCE

■ OFF HOOK-STATUS DETECTION OUTPUT

■ LOW EXTERNAL COMPONENT COUNT

L3845D属于集成电路（IC） > 专用。意法半导体（ST）集团制造生产的L3845D专用该系列产品可提供所需的功能，用以将信息源/信宿连到各种复杂或范围狭窄应用中的传感器、变送器、致动器、传输介质或其他此类端点。例如，汽车安全气囊驱动器、车身控制和信息娱乐总线、自适应电缆均衡器、智能卡等等。