Datasheet LT1886 (Analog Devices)

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