| Linear LTC6421-20高速差分放大方案 |
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| 作者：未知 来源：Linear 点击数：138 更新时间：2008-5-21 |
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Linear公司的LTC6421-20是双路高速差分放大器,可处理的信号从DC到140MHz,具有特别低的噪音和失真,适合驱动12位/14位/16位ADC;同时还可用作通用的宽带增益区块,广泛应用在差分ADC驱动器,差分驱动器/接收器,单端到差分的转换以及IF取样接收器.本文介绍了LTC6421-20的主要特性,方框图,典型应用电路图以及演示板的电路图.
The LTCR6421-20 is a dual high speed differential amplifier targeted at processing signals from DC to 140MHz. The part has been specifically designed to drive 12-, 14- and
16-bit ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block.
The LTC6421-20 is easy to use, with minimal support circuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling capacitors in many applications. The gain is internally fixed at 20dB (10V/V).
The LTC6421-20 saves space and power compared to alternative solutions using IF gain blocks and transformers.
The LTC6421-20 is packaged in a compact 20-lead 3mmX4mm QFN package and operates over the –40°C to 85°C temperature range.
主要特性:
Matched Gain ±0.1dB
Matched Phase ±0.2° at 100MHz
Channel Separation 80dB at 100MHz
1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
IMD3 = –76dBc at 100MHz, 2VP-P
Equivalent OIP3 = 42dBm at 100MHz
1nV/√Hz Internal Op Amp Noise
6.2dB Noise Figure
Differential Inputs and Outputs
Rail-to-Rail Output Swing
40mA Supply Current (120mW) per Amplifi er
1V to 1.6V Output Common Mode Voltage, Adjustable
DC- or AC-Coupled Operation
20-Lead 3mmx4mmx0.75mm QFN Package
应用:
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling (Diversity) Receivers
图1. LTCR6421-20方框图
图2. LTCR6421-20典型应用电路
图3. LTCR6421-20演示电路图(测试电路A)
详情请见:
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1009,C1126,P80589,D26247
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