Datasheet LT1739 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual 500mA, 200MHz xDSL Line Driver Amplifier |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTIO. 3mm. 4mm High Power DFN Package. Exceeds All … |
| File Format / Size | PDF / 293 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. 3mm. 4mm High Power DFN Package. Exceeds All Requirements For Full Rate,. Downstream ADSL Line Drivers
Model Line for this Datasheet
Text Version of Document
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
