(China (Mainland))
Product Summary
The AM7942-2JC is a subscriber line Interface circuit with -19 v to -58 v battery operation. It is ideal for PBX and KTS applications.
Parametrics
Absolute maximum ratings: (1)Storage temperature: –55℃ to +150℃ ; (2)VCC with respect to AGND/DGND: –0.4 V to +7.0 V; (3)VEE with respect to AGND/DGND: +0.4 V to –7.0 V; (4)VBAT with respect to AGND/DGND: +0.4 V to –70 V; (5)BGND with respect to AGND/DGND: +1.0 V to –3.0 V; (6)A(TIP) or B(RING) to BGND: Continuous: –70 V to +1.0 V; 10 ms (f = 0.1 Hz): –70 V to +5.0 V; 1 μs (f = 0.1 Hz): –90 V to +10 V; 250 ns (f = 0.1 Hz): –120 V to +15 V; (7)Current from A(TIP) or B(RING): ±150 mA; (8)Voltage on RINGOUT: BGND to 70 V above QBAT; (9)Voltage on TESTOUT: BGND to 70 V above QBAT; (10)Current through relay drivers: 60 mA; (11)Voltage on ring-trip inputs DA and DB: VBAT to 0 V; (12)Current into ring-trip inputs: ±10 mA; (13)Peak current into regulator switch (L pin): 150 mA; (14)Switcher transient peak off voltage on L pin: +1.0 V; (15)C4–C1, E1, CHCLK, to AGND/DGND: –0.4 V to VCC + 0.4 V; (16)Maximum power dissipation: TA = 70℃ ; (17)In 32-pin PLCC package: 1.74 W.
Features
Features: (1)programmable constant-current feed; (2)receive current gain=200; (3)programmable loop-detect threshold; (4)low standby power; (5)performs polarity reversal; (6)ground-key detector; (7)pin for external ground-key noise filter capacitor; (8)test relay driver option(PLCC only); (9)tip open state fro ground-start lines; (10)-19 v to -58 v battery operation; (11)ideal for PBX and KTS applications; (12)on-chip switching regulator for low-power dissipation; (13)can be used with or without the on-chip switching regulator; (14)two-wire impedance sey by single external impedance; (15)on-hook transmission.
Diagrams
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