1

LT1969

Dual 700MHz, 200mA,

Adjustable Current Operational Amplifier

s

700MHz Gain Bandwidth

s

s

Adjustable Quiescent Current

s

s

s

s

Stable with 1000pF Load

s

6nV/

√Hz Input Noise Voltage

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2pA/

√Hz Input Noise Current

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4mV Maximum Input Offset Voltage

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4

µA Maximum Input Bias Current

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400nA Maximum Input Offset Current

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s

Specified at

±6V, ±2.5V

The LT

popular LT1886, a 200mA minimum output current, dual

op amp with outstanding distortion performance. The

adjustable current feature is highly desirable in applica-

tions where minimum power dissipation is required while

still being able to provide adequate line termination.

At nominal supply current, the amplifiers are gain of 10

stable and can easily be compensated for lower gains. The

LT1969 features balanced high impedance inputs with

4

µA 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.

The output drives a 25

Ω 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

making it useful in buffer and cable driver applications.

The LT1969 is manufactured on Linear Technology’s

advanced low voltage complementary bipolar process and

is available in a thermally enhanced MS10 package

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DSL Modems

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xDSL PCI Cards

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USB Modems

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Line Drivers

Single 12V Supply ADSL Modem Line Driver

ADSL Modem Line Driver Distortion

, LTC and LT are registered trademarks of Linear Technology Corporation.

–

+

1/2 LT1969

12.4

Ω

1:2*

12V

909

Ω

100

Ω

100

Ω

20k

10k

10k

20k

1

µF

1

µF

0.1

µF

0.1

µF

1/2 LT1969

12.4

Ω

1969 TA01a

909

Ω

100

Ω

13k

*COILCRAFT X8390-A

OR EQUIVALENT

6

49.9k

STANDBY ON

LOGIC

OUTPUT

CTRL1 CTRL2

7

STANDBY

LOW POWER ON

0

–60

–70

–80

–90

–100

1969 TA01b

2

4

6

8

10

12

14

16

f = 200kHz

100

Ω LINE

1:2 TRANSFORMER

HD2

HD3

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO