Datasheet LT1739 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Dual 500mA, 200MHz xDSL Line Driver Amplifier |
| 页数 / 页 | 20 / 1 — FEATURES. DESCRIPTIO. 3mm. 4mm High Power DFN Package. Exceeds All … |
| 文件格式/大小 | PDF / 293 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. 3mm. 4mm High Power DFN Package. Exceeds All Requirements For Full Rate,. Downstream ADSL Line Drivers
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LT1739 Dual 500mA, 200MHz xDSL Line Driver Amplifier
U FEATURES DESCRIPTIO
■
3mm
×
4mm High Power DFN Package
The LT®1739 is a 500mA minimum output current, dual op ■
Exceeds All Requirements For Full Rate,
amp with outstanding distortion performance. The ampli-
Downstream ADSL Line Drivers
fiers are gain-of-ten stable, but can be easily compensated ■ ±
500mA Minimum IOUT
for lower gains. The extended output swing allows for ■ ±
11.1V Output Swing, VS =
±
12V, RL = 100
Ω lower supply rails to reduce system power. Supply current ■ ±
10.9V Output Swing, VS =
±
12V, IL = 250mA
is set with an external resistor to optimize power dissipa- ■
Low Distortion: – 82dBc at 1MHz, 2VP-P Into 50
Ω tion. The LT1739 features balanced, high impedance in- ■ Power Saving Adjustable Supply Current puts with low input bias current and input offset voltage. ■ Power Enhanced TSSOP-20 Small Footprint Package Active termination is easily implemented for further sys- ■ 200MHz Gain Bandwidth tem power reduction. Short-circuit protection and thermal ■ 600V/µs Slew Rate shutdown insure the device’s ruggedness. ■ Specified at ±12V and ±5V The outputs drive a 100Ω load to ±11.1V with ±12V
U
supplies, and ±10.9V with a 250mA load. The LT1739 is a
APPLICATIO S
pin-for-pin replacement for the LT1794 in xDSL line driver applications and requires no circuit changes. ■
High Density ADSL Central Office Line Drivers
■
High Efficiency ADSL, HDSL2, G.lite,
The LT1739 is available in the very small, thermally
SHDSL Line Drivers
enhanced, 3mm × 4mm DFN package or a 20-lead TSSOP ■ Buffers for maximum port density in central office line driver ■ Test Equipment Amplifiers applications. For a dual version of the LT1739, see the ■ Cable Drivers LT6301 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO High Efficiency
±
12V Supply ADSL Central Office Line Driver
12V
3mm
×
4mm DFN Package
RBIAS
Bottom View
24.9k +IN + SHDN 1/2 12.7Ω LT1739 EXPOSED – THERMAL PAD 1k 1:2* 110Ω 0.8mm • • 100Ω 1000pF 110Ω 1739 TA01 1k 1739 TA02 3mm 4mm – *COILCRAFT X8390-A OR EQUIVALENT ISUPPLY = 10mA PER AMPLIFIER 1/2 12.7Ω WITH RBIAS = 24.9k LT1739 SHDNREF –IN + –12V 1739fas, sn1739 1
U FEATURES DESCRIPTIO
■
3mm
×
4mm High Power DFN Package
The LT®1739 is a 500mA minimum output current, dual op ■
Exceeds All Requirements For Full Rate,
amp with outstanding distortion performance. The ampli-
Downstream ADSL Line Drivers
fiers are gain-of-ten stable, but can be easily compensated ■ ±
500mA Minimum IOUT
for lower gains. The extended output swing allows for ■ ±
11.1V Output Swing, VS =
±
12V, RL = 100
Ω lower supply rails to reduce system power. Supply current ■ ±
10.9V Output Swing, VS =
±
12V, IL = 250mA
is set with an external resistor to optimize power dissipa- ■
Low Distortion: – 82dBc at 1MHz, 2VP-P Into 50
Ω tion. The LT1739 features balanced, high impedance in- ■ Power Saving Adjustable Supply Current puts with low input bias current and input offset voltage. ■ Power Enhanced TSSOP-20 Small Footprint Package Active termination is easily implemented for further sys- ■ 200MHz Gain Bandwidth tem power reduction. Short-circuit protection and thermal ■ 600V/µs Slew Rate shutdown insure the device’s ruggedness. ■ Specified at ±12V and ±5V The outputs drive a 100Ω load to ±11.1V with ±12V
U
supplies, and ±10.9V with a 250mA load. The LT1739 is a
APPLICATIO S
pin-for-pin replacement for the LT1794 in xDSL line driver applications and requires no circuit changes. ■
High Density ADSL Central Office Line Drivers
■
High Efficiency ADSL, HDSL2, G.lite,
The LT1739 is available in the very small, thermally
SHDSL Line Drivers
enhanced, 3mm × 4mm DFN package or a 20-lead TSSOP ■ Buffers for maximum port density in central office line driver ■ Test Equipment Amplifiers applications. For a dual version of the LT1739, see the ■ Cable Drivers LT6301 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO High Efficiency
±
12V Supply ADSL Central Office Line Driver
12V
3mm
×
4mm DFN Package
RBIAS
Bottom View
24.9k +IN + SHDN 1/2 12.7Ω LT1739 EXPOSED – THERMAL PAD 1k 1:2* 110Ω 0.8mm • • 100Ω 1000pF 110Ω 1739 TA01 1k 1739 TA02 3mm 4mm – *COILCRAFT X8390-A OR EQUIVALENT ISUPPLY = 10mA PER AMPLIFIER 1/2 12.7Ω WITH RBIAS = 24.9k LT1739 SHDNREF –IN + –12V 1739fas, sn1739 1