Current Detector 37 Current detectors are designed to automatically detect loop current in the network control unit of fax, modem and other office equipment. Comparing to photo coupler and relay used in the same application, current detector offers following advantages: Features * Low threshold current * Low input impedance * High isolation voltage * Current direction detection capability * High sensitivity of current detection function * Ultra-compact size * Superior reliability * Nemko/CB Report/VDE approvals Applications The most common applications of current detectors include: * Fax Machine * Cordless Phone * Fax Card * Modem * Answering Machine * PBX Application Example Cyntec's current detectors, designed to work with current over 10mA, are most suitable for detecting loop current generated in the Network Control Unit (NCU). They offer a lot of advantages to replace photocoupler and relay. A typical application is shown as below: RELAY OP1 OP2 CHK* T FAX L2 L1 CURRENT DETECTOR MODEM R TELEPHONE TELEPHONE RINGER A current detector provides two basic functions 1. M anual operation: When manually operating the telephone in a fax machine, the internal telephone function will be disabled according to the output signal of the current detector. 2. A utomatic operation: Under automatic operation, a relay is used to replace the actual telephone hook. By detecting the loop current condition, current detector sends a signal to provide the status of the telephone line. 38 Specifications Item MA91000009 MA91000018 MA91000036 MA91000045 MA91000063 Supply Voltage (Vcc) +5V 5% +5V 5% +5V 5% +5V 5% +5V 5% Isolation Voltage 4KV AC 4KV AC 2.2KV AC 3.75KV AC 2.2KV AC Primary/Secondary for 1min. for 1min. for 1min. for 1min. for 1min. o o o o +0 C ~+50 C o o o o -10 C ~+70 C o o o o +0 C ~+50 C +0 C ~+50 C o o o o o o o o Operating Temp. Range +0 C ~+50 C Storage Temp. Range -20 C ~+80 C -20 C ~+80 C -20 C ~+80 C -20 C ~+80 C -20 C ~+80 C Input Resistance 3W max. 5W max. 5W max. 5W max. 5W max. Input Inductance 0.5 mH Max. 0.7 mH Max. 0.7 mH Max. 0.7 mH Max. 1.2 mH Typ. I/O Loss (Vo/Vi) * - - 33dB 3dB 0~3dB - *Vs= 0 dBm, Fc=1 KHz, Zs=600. Zl=600 Vi=-6 dBm Item Condition L1 L2 5mA* Pin/Symbol Min. OP1 3.5V OP2 3.5V Typ. OP1 Threshold Current L1 L2 Input Current Supply Current * 2mA for MA91000063 ** 5mA for MA91000063 Max. 0.8V L2 10mA** L1 10mA** OP2 3.5V OP1 3.5V OP2 0.8V Ta=25 O 2C Ii 120mA Ta=25 O Ic 2C 10mA 39 Outline Dimension (Unit: mm) Item MA91000009 MA91000018 MA91000036 MA91000045 MA91000063 Wide (W) 34.5 27 27 27 27 Thickness (T) 10 10 10 10 10 Height (H) 18 18 16 18 16 Pitch (P) 4 3 4 4 4 Distance 1 (D1) 15.24 10.16 5.08 7.62 5.08 Distance 2 (D2) 2 2 5 2 5 T Max. 5.0 1 H Max. W Max. D2 Max. D1 0.25 Typ 2.54 X P (Unit: mm) Pin Assignment Item MA91000009 MA91000018 MA91000036 MA91000045 MA91000063 1 L1 L1 L1 L1 L1 2 L2 L2 L2 L2 L2 3 GND GND GND GND GND 4 CHK OP2 CHK CHK CHK 5 OP2 OP1 OP2 OP2 OP2 6 OP1 Vcc OP1 OP1 OP1 7 Vcc Vcc Vcc Vcc MA910000XX CYNTEC XXXX 1 2 3 4 5 6 7