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AM79R70-1JC Fiches technique(PDF) 10 Page - Advanced Micro Devices |
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AM79R70-1JC Fiches technique(HTML) 10 Page - Advanced Micro Devices |
10 / 17 page P R E L I M I N A R Y 10 Am79R70 Data Sheet Notes: 1. Unless otherwise noted, test conditions are BAT1 = –67 V, BAT2 = –24 V, VCC = +5 V, VNEG = –5 V, RL = 600 Ω, RDC1 = 80 kΩ, RDC2 = 20 kΩ, RD = 75 kΩ, no fuse resistors, CHP = 0.018 µF, CDC = 1.2 µF, D1 = D2 = 1N400x, two-wire AC input impedance (ZSL) is a 600 Ω resistance synthesized by the programming network shown below. RSGL = open, RSGH = open, RDCR = 2 kΩ, RRT1 = 430 kΩ, RRT2 = 12 kΩ, CRT = 1.5 µF, RSLEW = 150 kΩ, CSLEW = 0.33 µF. 2. a. Overload level is defined when THD = 1%. b. Overload level is defined when THD = 1.5%. 3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that the two-wire AC load impedance matches the programmed impedance. 4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests. 5. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization. 6. Group delay can be greatly reduced by using a ZT network such as that shown in Note 1 above. The network reduces the group delay to less than 2 µs and increases 2WRL. The effect of group delay on linecard performance may also be compensated for by synthesizing complex impedance with the QSLAC or DSLAC device. 7. Open Circuit VAB can be modified using RSGH. 8. RD must be greater than 56 kΩ. Refer to Table 2 for typical value of RLTH. 9. Lower power is achieved by switching into low-battery state in standby. Standby loop current is returned to VBAT1 regardless of the battery selected. Table 1. SLIC Decoding (DET) Output State C3 C2 C1 2-Wire Status E1 = 1 E1 = 0 Battery Selection 0 0 0 0 Open Circuit Ring trip Ring trip B2EN 1 0 0 1 Ringing Ring trip Ring trip 2 0 1 0 Active Loop detector Ground key 3 0 1 1 On-hook TX (OHT) Loop detector Ground key 4 1 0 0 Tip Open Loop detector Ground key B2EN = 1** 5 1 0 1 Standby Loop detector Ground key VBAT1 6* 1 1 0 Active Polarity Reversal Loop detector Ground key B2EN 7* 1 1 1 OHT Polarity Reversal Loop detector Ground key Notes: * Only –1 performance grade devices support polarity reversal. ** For correct ground-start operation using Tip Open, VBAT1 on-hook battery must be used. RT2 = 150 k Ω CT1 = 60 pF RT1 = 150 k Ω VTX RSN VRX RRX = 300 k Ω ~ |
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