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LT1969

Dual 700MHz, 200mA,

Adjustable Current Operational Amplifier

FEATURES

s

DESCRIPTIO

700MHz Gain Bandwidth

鹵200mA

Minimum I

OUT

Adjustable Quiescent Current

Low Distortion: 鈥?2dBc at 1MHz, 4V

P-P

, 25鈩? A

V

= 2

Stable in A

V

鈮?/div>

10, Simple Compensation for A

V

< 10

鹵4.3V

Minimum Output Swing, V

S

=

鹵6V,

R

L

= 25鈩?/div>

Stable with 1000pF Load

6nV/鈭欻z Input Noise Voltage

2pA/鈭欻z Input Noise Current

4mV Maximum Input Offset Voltage

4碌A(chǔ) Maximum Input Bias Current

400nA Maximum Input Offset Current

鹵4.5V

Minimum Input CMR, V

S

=

鹵6V

Specified at

鹵6V, 鹵2.5V

The LT

廬

1969 is an adjustable current version of the

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碌A(chǔ) 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鈩?load to

鹵4.3V

with

鹵6V

supplies.

On

鹵2.5V

supplies, the output swings

鹵1.5V

with a 100鈩?/div>

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鈥檚

advanced low voltage complementary bipolar process and

is available in a thermally enhanced MS10 package

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

APPLICATIO S

s

DSL Modems

xDSL PCI Cards

USB Modems

Line Drivers

TYPICAL APPLICATIO

12V

0.1碌F

IN

+

Single 12V Supply ADSL Modem Line Driver

ADSL Modem Line Driver Distortion

鈥?0

12.4鈩?/div>

HARMONIC DISTORTION (dBc)

+

1/2 LT1969

鈥?/div>

909鈩?/div>

10k

20k

100鈩?/div>

1:2*

*COILCRAFT X8390-A

OR EQUIVALENT

100鈩?/div>

1碌F

10k

20k

1碌F

100鈩?/div>

909鈩?/div>

CTRL1 CTRL2

I

Q

ON = 14mA

I

Q

LOW POWER = 2mA

I

Q

STANDBY = 600碌A(chǔ)

STANDBY ON

LOGIC

OUTPUT

STANDBY

LOW POWER ON

1969 TA01a

6

12.4鈩?/div>

13k

7

49.9k

0.1碌F

IN

鈥?/div>

1/2 LT1969

U

鈥?0

V

S

= 12V

A

V

= 10

f = 200kHz

100鈩?LINE

1:2 TRANSFORMER

HD2

鈥?0

HD3

鈥?00

0

2

4

6

8

10 12

LINE VOLTAGE (V

P-P

)

14

16

1969 TA01b

U

+

鈥?/div>

U

1

型號(hào)

版本

描述

廠商

下載
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