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AM79R79-3JC Datasheet(PDF) 11 Page - Advanced Micro Devices |
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AM79R79-3JC Datasheet(HTML) 11 Page - Advanced Micro Devices |
11 / 20 page SLIC Products 11 Table 2. User-Programmable Components ZT is connected between the VTX and RSN pins. The fuse resistors are RF, and Z2WIN is the desired 2-wire AC input impedance. When com- puting ZT, the internal current amplifier pole and any external stray ca- pacitance between VTX and RSN must be taken into account. ZRX is connected from VRX to RSN. ZT is defined above, and G42L is the desired receive gain. RDC1, RDC2, and CDC form the network connected to the RDC pin. ILOOP is the desired loop current in the constant-current region. RDCR1, RDCR2, and CDCR form the network connected to the RDCR pin. See Applications Circuit for these components. CDCR sets the ringing time constant, which can be between 15 µs and 150 µs. for high battery state RD is the resistor connected from the RD pin to GND and RLTH is the loop-resistance threshold between on-hook and off-hook detection. RD should be greater than 56 k Ω to guarantee detection occurs in the Standby state. Choose the value of RD for high battery state; then use the equation for RLTH to find where the threshold is for low battery. Loop-Threshold Detect Equations for high battery This is the same equation as for RD above, except solved for RLTH. for low battery For low battery, the detect threshold is slightly higher, which avoids os- cillating between states. RLTH standby < RLTH active VBAT1 < RLTH active VBAT2, which guaran- tees no unstable states under all operating conditions. This equation shows at what resistance the standby threshold is; it is actually a cur- rent threshold rather than a resistance threshold, which is shown by the Vbat dependency. Z T 500 Z 2WIN 2R F – () = Z RX Z L G 42L ------------ 1000 Z T • Z T 500 Z L 2R F + () + -------------------------------------------------- • = R DC 1 R DC2 2500 I LOOP --------------- = + R DC R1 R DCR 2 + 3000 Iringlim ---------------------- = C DC 19 ms R DC 1 R DC2 + R DC1 RDC 2 --------------------------------- • = C DC R R DCR1 R DC R2 + R DC R1RDCR2 ---------------------------------------- • 150 µs = R D R LTH 12.67 • = R LTH R D 12.67 ------------- = R LTH R D 11.37 ------------- = R LTH V BAT1 10 – 915 ----------------------------- R D • 400 2R F – – = |
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