Datasheet > LT1251

LT1251

更新时间： 2023-12-20 18:46:04

品牌	Logo	应用领域
亚德诺 - ADI		衰减器放大器
页数	文件大小	规格书
24页	386K
描述
40MHz 视频衰减器和 DC 增益控制放大器

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LT1251 数据手册

LT1251/LT1256

40MHz Video Fader and

DC Gain Controlled Amplifier

FEATURES

DESCRIPTION

The LT^®1251/LT1256 are 2-input, 1-output, 40MHz cur-

rent feedback amplifiers with a linear control circuit that

sets the amount each input contributes to the output.

These parts make excellent electronically controlled vari-

able gain amplifiers, filters, mixers and faders. The only

external components required are the power supply by-

pass capacitors and the feedback resistors. Both parts

operate on supplies from ±2.5V (or single 5V) to ±15V

(or single 30V).

■

Accurate Linear Gain Control: ±1% Typ, ±3% Max

■

Constant Gain with Temperature

Wide Bandwidth: 40MHz

High Slew Rate: 300V/µs

Fast Control Path: 10MHz

Low Control Feedthrough: 2.5mV

High Output Current: 40mA

Low Output Noise

■

45nV/√Hz at A_V= 1

270nV/√Hz at A_V= 100

Low Distortion: 0.01%

Wide Supply Range: ±2.5V to ±15V

Low Supply Current: 13mA

Low Differential Gain and Phase: 0.02%, 0.02°

Absolute gain accuracy is trimmed at wafer sort to mini-

mize part-to-part variations. The circuit is completely

temperature compensated.

■

The LT1251 includes circuitry that eliminates the need for

accurate control signals around zero and full scale. For

control signals of less than 2% or greater than 98%, the

LT1251 sets one input completely off and the other

completely on. This is ideal for fader applications because

it eliminates off-channel feedthrough due to offset or gain

errors in the control signals.

APPLICATIONS

■

Composite Video Gain Control

■

RGB, YUV Video Gain Control

■

Video Faders, Keyers

■

Gamma Correction Amplifiers

TheLT1256doesnothavethison/offfeatureandoperates

linearly over the complete control range. The LT1256 is

recommended for applications requiring more than 20dB

of linear control range.

■

Audio Gain Control, Faders

■

Multipliers, Modulators

Electronically Tunable Filters

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

TYPICAL APPLICATION

LT1256

Two-Input Video Fader

Gain Accuracy vs Control Voltage

= ±5V

= 2.5V

LT1251/LT1256

CONTROL

IN1

IN2

–

2.5VDC

INPUT

0V TO 2.5V

CONTROL

–

–1

–2

–3

1.5k

2.5

NULL

100

(

–4 GAIN ACCURACY (%) =

–

)

VMEAS

(

)

–

–5

0.5

1.0

1.5

2.0

2.5

1251/56 TA01

OUT

CONTROL VOLTAGE (V)

1251/56 TA02

12 3 4 5 6 7...24

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