Datasheet > L6515SQ

L6515SQ

更新时间： 2024-11-12 03:49:55

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
18页	527K
描述
600 MHz, Digital Controlled, Variable Gain Amplifier

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L6515SQ 数据手册

October 2007

LMH6515

600 MHz, Digital Controlled, Variable Gain Amplifier

General Description

Features

The LMH6515 is a high performance, digitally controlled vari-

able gain amplifier (DVGA). It combines precision gain control

with a low noise, ultra-linear, differential amplifier. Typically,

the LMH6515 drives a high performance ADC in a broad

range of mixed signal and digital communication applications

such as mobile radio and cellular base stations where auto-

matic gain control (AGC) is required to increase system dy-

namic range. When used in conjunction with a high speed

ADC, system dynamic range can be extended by up to 32 dB.

Adjustable gain with a 31 dB range

■

Precise 1 dB gain steps

Parallel 5-bit gain control

On chip register stores gain setting

Fully differential signal path

Single ended to differential capable

200Ω input impedance

Small footprint (4 mm x 4 mm) LLP package

The LMH6515 has a differential input and output allowing

large signal swings on a single 5V supply. It is designed to

accept signals from RF elements and maintain a terminated

impedance environment. The input impedance is 200Ω re-

sistive. The output impedance is either 200Ω or 400Ω and is

user selectable. A unique internal architecture allows use with

both single ended and differential input signals.

Key Specifications

600 MHz bandwidth @ 100Ω load

40 dBm OIP3 @ 75 MHz, 200Ω load

20 dB to 30 dB maximum gain

Selectable output impedance of 200Ω or 400Ω

8.3 dB noise figure

■

Input signals to the LMH6515 are scaled by a highly linear,

digitally controlled attenuator with 31 accurate 1 dB steps.

The attenuator output provides the input signal for a high gain,

ultra linear differential transconductor. The transconductor

differential output current can be converted into a voltage by

using the on-chip 200Ω or 400Ω loads. The transconductance

gain is 0.1 Amp/Volt resulting in a maximum voltage gain of

+26 dB when driving a 200Ω load, or 32 dB when driving the

400Ω load. On chip digital latches are provided for local stor-

age of the gain setting. The gain step settling time is 5 ns and

care has been taken to reduce the sensitivity of bandwidth

and phase to gain setting.

5 ns gain step switching time

100 mA supply current

Applications

Cellular base stations

■

IF sampling receivers

Instrumentation

Modems

Imaging

The LMH6515 operates over the industrial temperature range

of −40°C to +85°C. The LMH6515 is available in a 16-Pin,

thermally enhanced, LLP package.

Differential line receiver

Typical Application

20214301

LMH™ is a trademark of National Semiconductor Corporation.

202143

www.national.com

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