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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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LT6300IGN Folha de dados(PDF) 8 Page - Linear Technology |
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LT6300IGN Folha de dados(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT6300 Logic Controlled Operating Current The DSP controller in a typical xDSL application can have I/O pins assigned to provide logic control of the LT6300 line driver operating current. As shown in Figure 4 one or two logic control inputs can control two or four different operating modes. The logic inputs add or subtract current to the SHDN input to set the operating current. The one logic input example selects the supply current to be either full power, 10mA per amplifier or just 2mA per amplifier, which significantly reduces the driver power consumption APPLICATIO S I FOR ATIO RBIAS (kΩ) 4 7 10 50 90 130 170 210 250 30 70 100 150 190 230 270 290 20 25 30 35 40 6300 F03 5 10 15 0 45 VS = ±12V V+ = 12V RBIAS SHDN SHDNREF RBIAS = • 64 – 5k V+ – 1.2V IS PER AMPLIFIER (mA) IS PER AMPLIFIER (mA) • 64 V+ – 1.2V RBIAS + 5k ≈ Figure 3. RBIAS to Ground Current Control while maintaining less than 2 Ω output impedance to frequencies less than 1MHz. This low power mode retains termination impedance at the amplifier outputs and the line driving back termination resistors. With this termina- tion, while a DSL port is not transmitting data, it can still sense a received signal from the line across the back- termination resistors and respond accordingly. The two logic input control provides two intermediate (approximately 7mA per amplifier and 5mA per amplifier) operating levels between full power and termination Two Control Inputs RESISTOR VALUES (k Ω) RSHDN TO VCC (12V) RSHDN TO VLOGIC VLOGIC RSHDN RC1 RCO 3V 40.2 11.5 19.1 3.3V 43.2 13.0 22.1 5V 60.4 21.5 36.5 3V 4.99 8.66 14.3 3.3V 6.81 10.7 17.8 5V 19.6 20.5 34.0 VC0 H L H L VC1 H H L L 10 7 5 2 10 7 5 2 10 7 5 2 10 7 5 2 10 7 5 2 10 7 5 2 SUPPLY CURRENT PER AMPLIFIER (mA) One Control Input RESISTOR VALUES (k Ω) RSHDN TO VCC (12V) RSHDN TO VLOGIC VLOGIC RSHDN RC 3V 40.2 7.32 3.3V 43.2 8.25 5V 60.4 13.7 3V 4.99 5.49 3.3V 6.81 6.65 5V 19.6 12.7 VC H L 10 2 10 2 10 2 10 2 10 2 10 2 SUPPLY CURRENT PER AMPLIFIER (mA) RSHDN RC1 VC1 VLOGIC 12V OR VLOGIC 0V VC0 RC0 SHDN SHDNREF 2k RSHDN RC VC VLOGIC 12V OR VLOGIC 0V SHDN SHDNREF 6300 F04 2k Figure 4. Providing Logic Input Control of Operating Current |
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