LT6300 Linear Technology Corporation, LT6300 Datasheet
LT6300
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LT6300 Summary of contents
Page 1
... Active termination is easily implemented for further sys- tem power reduction. Short-circuit protection and thermal shutdown insure the device’s ruggedness. The outputs drive a 100 supplies, and 10.7V with a 250mA load. The LT6300 is a functional replacement for the LT1739 and LT1794 in xDSL line driver applications and requires no circuit changes. ...
Page 2
... – 12V INFORMATION ORDER PART TOP VIEW NUMBER – OUT LT6300CGN LT6300IGN + PART MARKING 7 10 OUT – 6300 GN PACKAGE 6300I 16-LEAD PLASTIC SSOP = 70 C C/W (Note 4) JA ...
Page 3
... Note 3: The LT6300C is guaranteed to meet specified performance from and is designed, characterized and expected to meet these extended temperature limits, but is not tested at – and 85 C. The LT6300I is guaranteed to meet the extended temperature limits ...
Page 4
... LT6300 W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Ambient Temperature 12V 24.9k TO SHDN BIAS SHDNREF –50 –30 – TEMPERATURE ( C) 6300 G01 Input Noise Spectral Density 100 12V S I PER AMPLIFIER = 10mA ...
Page 5
... SHDNREF 2.0 1.5 1.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 V (V) SHDN HD3 HD2 6300 G16 LT6300 Frequency Response vs Supply Current 12V 2mA PER AMPLIFIER 10 10mA PER AMPLIFIER 5 15mA PER AMPLIFIER 0 –5 –10 –15 –20 1k 10k 100k 1M 10M 100 FREQUENCY (Hz) ...
Page 6
... LT6300 W U TYPICAL PERFOR A CE CHARACTERISTICS Differential Harmonic Distortion vs Supply Current –40 –45 –50 – 1MHz, HD3 –60 – 100kHz, HD2 –70 – 100kHz, HD3 – 1MHz, HD2 – PER AMPLIFIER (mA) SUPPLY TEST CIRCUIT OUT (+) E SPLITTER IN OUT (–) 49 ...
Page 7
... The LT6300 is a high speed, 200MHz gain bandwidth product, dual voltage feedback amplifier with high output current drive capability, 500mA source and sink. The LT6300 is ideal for use as a line driver in xDSL data communication applications. The output voltage swing has been optimized to provide sufficient headroom when operating from 12V power supplies in full-rate ADSL applications ...
Page 8
... Figure 4. Providing Logic Input Control of Operating Current 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 ...
Page 9
... SHDNREF potential. As shown in Figure 5 complete shutdown occurs in less than 10 s and, more importantly, complete recovery from the shut down state to full operation occurs in less than 2 s. The biasing circuitry in the LT6300 reacts very quickly to bring the amplifiers back to normal operation. V SHDN ...
Page 10
... The quiescent current for the LT6300 is set to 10mA per amplifier. The power dissipated in the LT6300 is a combination of the quiescent power and the output stage power when driving a signal. The two amplifiers are configured to place a differential signal on to the line ...
Page 11
... In general, use feedback resistors less. Compensation The LT6300 is stable in a gain 10 or higher for any supply and resistive load easily compensated for lower gains with a single resistor or a resistor plus a capacitor. Figure 8 shows that for inverting gains, a resistor from the ...
Page 12
... LT6300 U U APPLICATIO S I FOR ATIO Another compensation scheme for noninverting circuits is shown in Figure 10. The circuit is unity gain at low fre- quency and a gain high frequency. The output offset is reduced by a factor of ten. The techniques of Figures 9 and 10 can be combined as shown in Fig- ure 11 ...
Page 13
... DC resistance of the P transformer primary. This high current can possibly cause –V the power supply voltage source to drop significantly O F14 impacting overall system performance. If left unchecked, the high DC current can heat the LT6300 to thermal shutdown – 1 )/[2(1 – ...
Page 14
... While the LT6300 has clamps to the supply rails at the output pins, they may not be large enough to handle the significant transient energy. External clamping diodes, such as BAV99s, at each end of the transformer primary ® ...
Page 15
... OUT Q15 C2 Q18 Q16 6300 SS 0.189 – 0.196* (4.801 – 4.978) 0.009 (0.229 REF 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.0098 (0.102 – 0.249) 0.0250 (0.635) BSC GN16 (SSOP) 1098 LT6300 15 ...
Page 16
... X8502-A OR EQUIVALENT – 1W DRIVER POWER DISSIPATION 13.7 1/2 1.15W POWER CONSUMPTION LT6300 SHDNREF + –12V COMMENTS 15V Operation, 1mV V Low Cost ADSL CO Driver, Low Power ADSL CO Driver, Extended Output Swing, Low Power Shutdown/Current Set Function, ADSL CO Driver Low Noise, Low Power Differential Receiver, 4mA/Amplifier ...