LT1886
Dual 700MHz, 200mA
Operational Amplifier
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DESCRIPTIO
FEATURES
The LT®1886 is a 200mA minimum output current dual op
amp with outstanding distortion performance. The ampli-
fiersaregain-of-tenstable, butcanbeeasilycompensated
for lower gains. The LT1886 features balanced, high
impedance inputs with 4µA maximum input bias current,
and 4mV maximum input offset voltage. Single supply
applications are easy to implement and have lower total
noise than current feedback amplifier implementations.
■
700MHz Gain Bandwidth
■
±200mA Minimum IOUT
■
Low Distortion: –72dBc at 1MHz, 4VP-P, 25Ω, AV = 2
■
Stable in AV ≥ 10, Simple Compensation for AV < 10
■
±4.3V Minimum Output Swing, VS = ±6V, RL = 25Ω
■
7mA Supply Current per Amplifier
200V/µs Slew Rate
Stable with 1000pF Load
■
■
■
6nV/√Hz Input Noise Voltage
2pA/√Hz Input Noise Current
The output drives a 25Ω load to ±4.3V with ±6V supplies.
On ±2.5V supplies the output swings ±1.5V with a 100Ω
load. The amplifier is stable with a 1000pF capacitive
load which makes it useful in buffer and cable driver
applications.
■
■
4mV Maximum Input Offset Voltage
■
4µA Maximum Input Bias Current
■
400nA Maximum Input Offset Current
■
±4.5V Minimum Input CMR, VS = ±6V
■
The LT1886 is manufactured on Linear Technology’s
advancedlowvoltagecomplementarybipolarprocessand
is available in a thermally enhanced SO-8 package.
Specified at ±6V, ±2.5V
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APPLICATIO S
■
DSL Modems
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xDSL PCI Cards
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USB Modems
Line Drivers
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, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Single 12V Supply ADSL Modem Line Driver
12V
0.1µF
ADSL Modem Line Driver Distortion
+
IN
+
–60
12.4Ω
V
A
= 12V
= 10
S
V
1/2 LT1886
f = 200kHz
–
100Ω LINE
–70
–80
909Ω
1:2 TRANSFORMER
10k
10k
20k
20k
1:2*
100Ω
HD2
HD3
100Ω
1µF
1µF
100Ω
909Ω
–90
*COILCRAFT X8390-A
OR EQUIVALENT
–
12.4Ω
–100
1886 TA01
0.1µF
1/2 LT1886
0
2
4
6
8
10 12 14 16
+
–
LINE VOLTAGE (V
)
P-P
IN
1886 TA01a
1