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TS615IPWT 数据表(PDF) 23 Page - STMicroelectronics |
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TS615IPWT 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 27 page ![]() TS615 23/27 POWER DOWN MODE BEHAVIOUR Figure 66 : Equivalent Schematic Please note that the short circuited output in pow- er down mode is referenced to (-VCC). No problem appears when used in differential mode. Never- theless, when used in single ended on a load ref- erenced to GND, the (-VCC) level contributes to a current consumption through the load. As de- scribed on the Figure 68, the interest of featuring an output short circuit in power down mode is to keep the best impedance matching between the system and the twisted pair telephone line when the modem is in sleep mode. By this way, the mo- dem can be waked-up with a signal from the line without any damage of this signal. This concept is particularly intended for the ADSL over voice mo- dems, where the modem in sleep mode, must be waked-up by the phone call. Figure 67 : Matching in Sleep Mode Figure 68 : Standby Mode. Time On >Off Figure 69 : Standby Mode. Time Off >On Figure 70 : Standby Mode. Input/Output Isolation vs. Frequency AV=+4, Rfb=620Ω, VCC=±6V, Vout=3Vp . + _ .. Vcc - Vcc + Ouput 1 . Rpdw + _ . .. Vcc + Vcc - Ouput 2 . A2 Rpdw -Vcc POWER DOWN pin6 -Vcc A1 1 .. 4 5 2 3 12 11 10 13 14 POWER DOWN pin6 TS615 1:2 Transformer Line (100 Ω) Consumption=80 µA POWER DOWN 25 Ω 12.5 Ω 12.5 Ω 5 Ω max. The system can be waked-up from the line Matching TS615 1:2 Transformer Line (100 Ω) Consumption=80 µA POWER DOWN 25 Ω 12.5 Ω 12.5 Ω 5 Ω max. The system can be waked-up from the line Matching 0 1020 304050 -6 -5 -4 -3 -2 -1 0 Vout Vpdw Disabled Output Enabled Output Time ( µs) 012 345 −6 −5 −4 −3 −2 −1 0 1 Disabled Output Enabled Output Vpdw Vout Time (µs) 10k 100k 1M 10M -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 Frequency (Hz) |
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