LT6300 LINER
Document overview
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Technical content
500mA, 200MHz xDSL Line Driver in 16-Lead SSOP Package I Exceeds All Requirements For Full Rate, Downstream ADSL Line Drivers I Power Enhanced 16-Lead SSOP Package I Power Saving Adjustable Supply Current I ±500mA Minimum IOUT I ±10.9V Output Swing, VS = ±12V, RL = 100Ω I ±10.7V Output Swing, VS = ±12V, IL = 250mA I Low Distortion: –82dBc at 1MHz, 2VP-P Into 50Ω I 200MHz Gain Bandwidth I 600V/µs Slew Rate I Specified at ±12V and ±5V I High Efficiency ADSL, HDSL2, SHDSL Line Drivers I Buffers I Test Equipment Amplifiers I Cable Drivers The LT ®6300 is a 500mA minimum output current, dual op amp with outstanding distortion performance. The ampli- fiers are gain-of-ten stable, but can be easily compensated for lower gains. The extended output swing allows for lower supply rails to reduce system power. Supply current is set with an external resistor to optimize power dissipa- tion. The LT6300 features balanced, high impedance in- puts with low input bias current and input offset voltage. 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 100Ω load to ±10.9V with ±12V 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. The LT6300 is available in the very small, thermally enhanced, 16-lead SSOP package (same PCB area as the SO-8 package) for maximum port density in line driver applications. , LTC and LT are registered trademarks of Linear Technology Corporation. High Efficiency ±12V Supply ADSL Line Driver
6300 TA01
–IN LT6300 +IN 12V SHDN –12V 12.7Ω 24.9k 1:2* 110Ω 1000pF 110Ω 12.7Ω SHDNREF 100Ω *COILCRAFT X8390-A OR EQUIVALENT ISUPPLY = 10mA PER AMPLIFIER WITH RSHDN = 24.9k
FEATURES
U APPLICATIO S U TYPICAL APPLICATIO U
Specified Temperature Range (Note 3).. – 40°C to 85°C LT6300CGN LT6300IGN Consult LTC Marketing for parts specified with wider operating temperature ranges. ABSOLUTE MAXIMUM RATINGS W W W U PACKAGE/ORDER INFORMATION W U U (Note 1) TJMAX = 150°C, θJA = 70°C/W to 95°C/W (Note 4)
ELECTRICAL CHARACTERISTICS
The G denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C. VCM = 0V, pulse tested, ±5V ≤ VS ≤ ±12V, VSHDNREF = 0V, RBIAS = 24.9k between V+ and SHDN unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOS Input Offset Voltage 5.0 mV G 7.5 mV Input Offset Voltage Matching 0.3 5.0 mV G 7.5 mV Input Offset Voltage Drift G µV/°C IOS Input Offset Current 100 500 nA G 800 nA IB Input Bias Current ±0.1 µA G µA Input Bias Current Matching 100 500 nA G 800 nA en Input Noise Voltage Density f = 10kHz nV/√Hz in Input Noise Current Density f = 10kHz 0.8 pA/√Hz RIN Input Resistance VCM = (V+ – 2V) to (V–+ 2V) G MΩ Differential 6.5 MΩ CIN Input Capacitance pF Input Voltage Range (Positive) (Note 5) G V+ – 2 V+ – 1 V Input Voltage Range (Negative) (Note 5) G V– + 1 V– + 2 V CMRR Common Mode Rejection Ratio VCM = (V+ – 2V) to (V– + 2V) dB G dB PSRR Power Supply Rejection Ratio VS = ±4V to ±12V dB G dB GN PART MARKING 6300 6300I TOP VIEW –IN +IN SHDN SHDNREF +IN –IN OUT NC NC OUT GN PACKAGE 16-LEAD PLASTIC SSOP
The G denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C. VCM = 0V, pulse tested, ±5V ≤ VS ≤ ±12V, VSHDNREF = 0V, RBIAS = 24.9k between V+ and SHDN unless otherwise noted. (Note 3) AVOL Large-Signal Voltage Gain VS = ±12V, VOUT = ±10V, RL = 40Ω dB G dB VS = ±5V, VOUT = ±3V, RL = 25Ω dB G dB VOUT Output Swing VS = ±12V, RL = 100Ω 10.7 10.9 G 10.5 VS = ±12V, IL = 250mA 10.4 10.7 G 10.2 VS = ±5V, RL = 25Ω 3.5 3.8 G 3.3 VS = ±5V, IL = 250mA 3.4 3.7 G 3.2 IOUT Maximum Output Current VS = ±12V, RL = 1Ω 500 1200 mA IS Supply Current per Amplifier VS = ±12V, RBIAS = 24.9k (Note 6) 8.0 13.5 mA G 6.7 15.0 mA VS = ±12V, RBIAS = 32.4k (Note 6) mA VS = ±12V, RBIAS = 43.2k (Note 6) mA VS = ±12V, RBIAS = 66.5k (Note 6) mA VS = ±5V, RBIAS = 24.9k (Note 6) 2.2 3.4 5.0 mA G 1.8 5.8 mA Supply Current in Shutdown VSHDN = 0.4V 0.1 mA Output Leakage in Shutdown VSHDN = 0.4V 0.3 mA Channel Separation VS = ±12V, VOUT = ±10V, RL = 40Ω 110 dB G dB SR Slew Rate VS = ±12V, AV = –10, (Note 7) 300 600 V/µs VS = ±5V, AV = –10, (Note 7) 100 200 V/µs HD2 Differential 2nd Harmonic Distortion VS = ±12V, AV = 10, 2VP-P, RL = 50Ω, 1MHz –85 dBc HD3 Differential 3rd Harmonic Distortion VS = ±12V, AV = 10, 2VP-P, RL = 50Ω, 1MHz –82 dBc GBW Gain Bandwidth f = 1MHz 200 MHz Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Applies to short circuits to ground only. A short circuit between the output and either supply may permanently damage the part when operated on supplies greater than ±10V. Note 3: The LT6300C is guaranteed to meet specified performance from 0°C to 70°C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at –40°C and 85°C. The LT6300I is guaranteed to meet the extended temperature limits. Note 4: Thermal resistance varies depending upon the amount of PC board metal attached to Pins 1, 8, 9, 16 of the device. If the maximum dissipation of the package is exceeded, the device will go into thermal shutdown and be protected. Note 5: Guaranteed by the CMRR tests. Note 6: RBIAS is connected between V+ and the SHDN pin, with the SHDNREF pin grounded. Note 7: Slew rate is measured at ±5V on a ±10V output signal while operating on ±12V supplies and ±1V on a ±3V output signal while operating on ±5V supplies.
TYPICAL PERFOR A CE CHARACTERISTICS U W Supply Current vs Ambient Temperature Input Common Mode Range vs Supply Voltage Input Bias Current vs Ambient Temperature SUPPLY VOLTAGE (±V) COMMON MODE RANGE (V) 1.0 2.0 –2.0
6300 G02
–1.0 0.5 1.5 –1.5 –0.5 TA = 25°C ∆VOS > 1mV TEMPERATURE (°C) –50 ISUPPLY PER AMPLIFIER (mA)
6300 G01
–30 –10 VS = ±12V RBIAS = 24.9k TO SHDN VSHDNREF = 0V TEMPERATURE (°C) –50 ±IBIAS (nA) 120 160 200
6300 G03
–30 –10 VS = ±12V IS PER AMPLIFIER = 10mA Input Noise Spectral Density Output Short-Circuit Current vs Ambient Temperature Output Saturation Voltage vs Ambient Temperature FREQUENCY (Hz) INPUT VOLTAGE NOISE (V/√Hz) INPUT CURRENT NOISE (pA/√Hz) 100 10k
6300 G04
0.1 100 0.1 100 100k en in TA = 25°C VS = ±12V IS PER AMPLIFIER = 10mA TEMPERATURE (°C) –50 600 ISC (mA) 620 660 680 700 800 740 –10
6300 G05
–30 VS = ±12V IS PER AMPLIFIER = 10mA SINKING SOURCING TEMPERATURE (°C) –50 OUTPUT SATURATION VOLTAGE (V) –0.5
6300 G06
1.0 –30 –10 0.5 –1.0 –1.5 1.5 VS = ±12V RL = 100Ω RL = 100Ω ILOAD = 250mA ILOAD = 250mA Open-Loop Gain and Phase vs Frequency –3dB Bandwidth vs Supply Current Slew Rate vs Supply Current FREQUENCY (Hz) –20 GAIN (dB) PHASE (DEG) 100 120 –40 –60 100k 10M 100M
6300 G07
–80 –160 120 –200 –240 –80 –40 –120 –280 TA = 25°C VS = ±12V AV = –10 RL = 100Ω IS PER AMPLIFIER = 10mA PHASE GAIN SUPPLY CURRENT PER AMPLIFIER (mA) –3dB BANDWIDTH (MHz)
6300 G08
TA = 25°C VS = ±12V AV = 10 RL = 100Ω SUPPLY CURRENT PER AMPLIFIER (mA) SLEW RATE (V/µs) 600 800 1000 11 12
6300 G09
TA = 25°C VS = ±12V AV = –10 RL = 1k RISING FALLING
TYPICAL PERFOR A CE CHARACTERISTICS U W CMRR vs Frequency PSRR vs Frequency Frequency Response vs Supply Current FREQUENCY (MHz) 0.1 COMMON MODE REJECTION RATIO (dB) 100
6300 G10
TA = 25°C VS = ±12V IS = 10mA PER AMPLIFIER FREQUENCY (MHz) POWER SUPPLY REJECTION (dB) 100 0.01 100
6300 G11
–10 0.1 VS = ±12V AV = 10 IS = 10mA PER AMPLIFIER (–) SUPPLY (+) SUPPLY FREQUENCY (Hz) 10k GAIN (dB) 100k 10M 100M
6300 G12
–10 –15 –20 VS = ±12V AV = 10 2mA PER AMPLIFIER 10mA PER AMPLIFIER 15mA PER AMPLIFIER Output Impedance vs Frequency ISHDN vs VSHDN Supply Current vs VSHDN FREQUENCY (MHz) 0.01 0.1 0.01 OUTPUT IMPEDANCE (Ω) 1000 100
6300 G13
0.1 100 TA = 25°C VS ±12V IS PER AMPLIFIER = 2mA IS PER AMPLIFIER = 10mA IS PER AMPLIFIER = 15mA VSHDN (V) ISHDN (mA) 1.5 2.0 2.5 4.0
6300 G14
1.0 0.5 1.0 2.0 3.0 5.0 3.5 0.5 1.5 2.5 4.5 TA = 25°C VS = ±12V VSHDNREF = 0V VSHDN (V) SUPPLY CURRENT PER AMPLIFIER (mA) 4.0
6300 G15
1.0 2.0 3.0 5.0 3.5 0.5 1.5 2.5 4.5 TA = 25°C VS = ±12V VSHDNREF = 0V Differential Harmonic Distortion vs Output Amplitude VOUT(P-P) –100 DISTORTION (dBc) –90 –70 –60 –50
6300 G16
–80 –40 f = 1MHz TA = 25°C VS = ±12V AV = 10 RL = 50Ω IS PER AMPLIFIER = 10mA HD3 HD2 Differential Harmonic Distortion vs Frequency FREQUENCY (kHz) DISTORTION (dBc) –60 –50 –40 800
6300 G17
–70 –80 –65 –55 –45 –75 –85 –90 200 100 400 300 600 700 900 500 1000 VO = 10VP-P TA = 25°C VS = ±12V AV = 10 RL = 50Ω IS PER AMPLIFIER = 10mA HD3 HD2
TYPICAL PERFOR A CE CHARACTERISTICS U W Differential Harmonic Distortion vs Supply Current Undistorted Output Swing vs Frequency ISUPPLY PER AMPLIFIER (mA) –85 DISTORTION (dBc) –80 –70 –65 –60 –40
6300 G18
–75 –55 –50 –45 VO = 10VP-P VS = ±12V AV = 10 RL = 50Ω f = 1MHz, HD3 f = 1MHz, HD2 f = 100kHz, HD2 f = 100kHz, HD3 FREQUENCY (Hz) 100k OUTPUT VOLTAGE (VP-P) 300k 10M
6300 G19
SFDR > 40dB TA = 25°C VS = ±12V AV = 10 RL = 50Ω IS PER AMPLIFIER = 10mA TEST CIRCUIT –12V 12V 4 (SHDN) RBIAS 110Ω OUT (+) OUT (–) 10k EIN 0.01µF RL ≈ 50Ω 1:2* 10k 49.9Ω 110Ω 12.7Ω 6300 TC 5 (SHDNREF) A 0.1µF 4.7µF 0.1µF 12V –12V B –12V 12.7Ω VOUT(P-P)
100 LINE LOAD
*COILCRAFT X8390-A OR EQUIVALENT VOUTP-P AMPLITUDE SET AT EACH AMPLIFIER OUTPUT DISTORTION MEASURED ACROSS LINE LOAD SPLITTER MINICIRCUITS ZSC5-2-2 4.7µF 0.1µF 4.7µF
surface mount package to minimize PCB area. compensating components can be used. current to 10mA per amplifier. escent current if direct voltage drive of the SHDN pin is used. SHDNREF pin and ground while the SHDN pin is tied to V+. Either approach is equally effective. Figure 1. Internal Current Biasing Circuitry
6300 F01
6300 F02
- 25.6 – 2k V+ – 1.2V IS PER AMPLIFIER (mA) IS PER AMPLIFIER (mA)
- 25.6 V+ – 1.2V RBIAS + 2k
Figure 2. RBIAS to V+ Current Control
6300 F03
- 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 termination resistors and respond accordingly.
6300 F04
Figure 4. Providing Logic Input Control of Operating Current
amplifiers back to normal operation.
6300 F05
Figure 5. Shutdown and Recovery Timing Figure 6. Estimating Line Driver Power Dissipation
6300 F06
with a lower quiescent current value. operating current is diverted to the load. Figure 7. IQ vs ILOAD
6300 F07
electrically connected to the V– supply voltage. provide airflow through the cabinet and over the cards. 5°C/W for every 100lfpm of laminar airflow. rent, use low ESR supply bypass capacitors (1µF to 10µF). with a single resistor or a resistor plus a capacitor. and CC should be less than 5MHz to minimize peaking. between the inverting input and an AC ground. Figure 8. Compensation for Inverting Gains
6300 F08
6300 F09
Figure 9. Compensation for Noninverting Gains
bypassed to ground with a 1000pF or larger capacitor. characteristic impedance (50Ω, 75Ω, 100Ω, 135Ω, etc.). for a given power supply voltage. Figure 13. Positive feedback increases the effective back-
6300 F10
Figure 10. Alternate Noninverting Compensation
6300 F11
Figure 11. Combination Compensation
6300 F12
Figure 12. Standard Cable/Line Back Termination
6300 F13
Figure 13. Back Termination Using Postive Feedback
dissipates only 1W of power, a 30% reduction. ends of the RBT resistors, reducing the sensed amplitude. implemented through a separate line coupling transformer.
6300 F14
Figure 14. Back Termination Using Differential Postive Feedback
possibility for DC current to flow under any conditions.
6300 F15
Figure 15. Protecting the Driver Against Load Faults and Line Transients
U PACKAGE DESCRIPTIO –IN +IN OUT Q12 Q16 Q17 Q15 Q14 Q13 Q18 6300 SS Q10 Q11 SI PLIFIED SCHE ATIC W W (one amplifier shown) 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) GN16 (SSOP) 1098 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.229 – 0.244 (5.817 – 6.198) 0.150 – 0.157 (3.810 – 3.988) 16 15 14 13 0.189 – 0.196* (4.801 – 4.978) 12 11 10 9 0.016 – 0.050 (0.406 – 1.270) 0.015 ± 0.004 0° – 8° TYP 0.007 – 0.0098 (0.178 – 0.249) 0.053 – 0.068 (1.351 – 1.727) 0.008 – 0.012 (0.203 – 0.305) 0.004 – 0.0098 (0.102 – 0.249) 0.0250 (0.635) BSC 0.009 (0.229) REF Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LINEAR TECHNOLOGY CORPORATION 2001 6300f LT/TP 0701 2K • PRINTED IN THE USA PART NUMBER
DESCRIPTION
Dual 50MHz, 800V/µs Op Amp ±15V Operation, 1mV VOS, 1µA IB LT1739 Dual 500mA, 200MHz xDSL Line Driver Low Cost ADSL CO Driver, Low Power LT1794 Dual 500mA, 200MHz xDSL Line Driver ADSL CO Driver, Extended Output Swing, Low Power LT1795 Dual 500mA, 50MHz Current Feedback Amplifier Shutdown/Current Set Function, ADSL CO Driver LT1813 Dual 100MHz, 750V/µs, 8nV/√Hz Op Amp Low Noise, Low Power Differential Receiver, 4mA/Amplifier LT1886 Dual 200mA, 700MHz Op Amp 12V Operation, 7mA/Amplifier, ADSL Modem Line Driver LT1969 Dual 200mA, 700MHz Op Amp with Power Control 12V Operation, MSOP Package, ADSL Modem Line Driver RELATED PARTS Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 G FAX: (408) 434-0507 G www.linear.com Figure 16. ADSL Line Driver Using Active Termination