Datasheet
1
LT1794
Dual 500mA, 200MHz
xDSL Line Driver Amplifier
■
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
■
±500mA Minimum I
OUT
■
±11.1V Output Swing, V
S
= ±12V, R
L
= 100Ω
■
±10.9V Output Swing, V
S
= ±12V, I
L
= 250mA
■
Low Distortion: –82dBc at 1MHz, 2V
P-P
Into 50Ω
■
Power Saving Adjustable Supply Current
■
Power Enhanced Small Footprint Packages:
20-Lead TSSOP and 20-Lead SW
■
200MHz Gain Bandwidth
■
500V/µs Slew Rate
■
Specified at ±15V, ±12V and ±5V
■
High Density ADSL Central Office Line Drivers
■
High Efficiency ADSL, HDSL2, G.lite,
SHDSL Line Drivers
■
Buffers
■
Test Equipment Amplifiers
■
Cable Drivers
The LT
®
1794 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 LT1794 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 ±11.1V with ±12V
supplies, and ±10.9V with a 250mA load. The LT1794,
with its increased swing on lower supplies, can be used to
upgrade LT1795 line driver applications.
The LT1794 is available in the very small, thermally
enhanced, 20-lead TSSOP for maximum port density in
line driver applications. The 20-lead SW is also available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
High Efficiency ±12V Supply ADSL Central Office Line Driver
1794 TA01
+
–
1/2
LT1794
–IN
–
+
1/2
LT1794
+IN
12V
SHDN
–12V
12.7Ω
R
BIAS
24.9k
1:2*
110Ω
1000pF
110Ω
1k
1k
12.7Ω
SHDNREF
100Ω
*COILCRAFT X8390-A OR EQUIVALENT
I
SUPPLY
= 10mA PER AMPLIFIER
WITH R
BIAS
= 24.9k
•
•
FEATURES
DESCRIPTIO
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APPLICATIO S
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TYPICAL APPLICATIO
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