Datenblatt-Suchmaschine für elektronische Bauteile |
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TS612 Datenblatt(PDF) 3 Page - STMicroelectronics |
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TS612 Datenblatt(HTML) 3 Page - STMicroelectronics |
3 / 9 page 3/9 STMicroelectronics Solutions for ADSL Line Interfaces TA0313 The TS612 comes in SO20 plastic batwing package which increases its power dissipation capability to 2.7W at room temperature. It features a power-down or stand-by function in order to minimize the consumption when the modem is not in communication. Power Supply Remote ADSL modem terminals must be designed to be easily connected to a PC. For such applications, the driver should use a +12V single power supply, which is available via standard PCI connectors. Note that the TS613 and TS612 can also be powered by a dual power supply at +/-6V. Figure 4 shows a single +12V supply circuit with the TS613 as a remote terminal transmitter in differential mode. Note that one could also use the TS612 in exactly the same schema. The driver is biased with a mid-supply (nominally +6V) in order to maintain the DC component of the signal at +6V. This allows a maximum dynamic range between 0 and +12 V. Several options are possible in order to provide this bias supply—such as for example, a virtual ground using an operational amplifier, or, the cheapest solution, a two-resistor divider. A high resistance value is required to limit the current consumption. On the other hand, the current must be high enough to bias the inverting input of the driver. If we consider the positive input’s bias current (15µA max) as 1% of the current through the resistance divider (1.5mA), two 3.9k Ω resistors are sufficient to keep a stable mid-supply . Figure 3: Thermal considerations: power dissipation of the drivers vs. room temperature Figure 4: Implementation of the TS613 as a differential line driver with a +12V single supply -40 -30 -20 -10 0 102030 4050 6070 80 Room Temperature (°C) 0 1 2 3 4 5 TS612ID, Rthja=45°C/W TS613IPW, Rthja=70°C/W TS613ID, Rthja=175°C/W ½R1 R4 R2 _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 100Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 12.5 Ω 10n 1µ _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω 100Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n 1µ 12.5 Ω ½R1 ½R1 R4 R2 _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 100Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 12.5 Ω 10n 1µ _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω 100Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n 1µ 12.5 Ω ½R1 |
Ähnliche Teilenummer - TS612 |
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Ähnliche Beschreibung - TS612 |
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