LMH6518SQEVK National Semiconductor, LMH6518SQEVK Datasheet

LMH6518SQEVK

Manufacturer Part Number

LMH6518SQEVK

Description

KIT EVAL FOR LMH6518 VGA

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LMH6518SQEVK.pdf (30 pages)

2.LMH6518SQEVK.pdf (6 pages)

Specifications of LMH6518SQEVK

Channels Per Ic

1 - Single

Amplifier Type

Variable Gain

Output Type

Differential

-3db Bandwidth

900MHz

Operating Temperature

-40°C ~ 85°C

Current - Supply (main Ic)

210mA

Voltage - Supply, Single/dual (±)

4.75 V ~ 5.25 V

Board Type

Fully Populated

Utilized Ic / Part

LMH6518

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current - Output / Channel

Slew Rate

Lead Free Status / Rohs Status

Supplier Unconfirmed

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LMH6518 Evaluation Board

1.0 Package Includes

1. LMH6518 evaluation board (Tested board which takes a

2. USB Interface board (Figure 1) with 10 pin interconnect

2.0 Additional Items Needed

1. PC (Windows) with web connection

2. A single ended input signal for testing the LMH6518. The

This input should be offset to 2.5V DC (< ±1 mV of the un-

driven input voltage at R

possible input sources:

•

Lab generator (or other signal source) capable of 2.5V

offset in the presence of milli-volt level input signal

5V and ground power supply connection and outputs Main

and Auxiliary differential outputs).

cable (to mate with J6 on LMH6518 evaluation board).

This board interfaces to a PC USB port to “Write” the SPI

interface signals to the LMH6518 and can also display the

LMH6518 state through “Read” back

input signal should be of the speed, purity, and fidelity

needed to test LMH6518 functionality and to not limit mea-

sured performance. The LMH6518 has differential input;

however, this evaluation board is configured for single

ended drive (into the positive input, “+IN” (J3) SMA con-

nector) and the undriven input is biased to V

on board.

or LMH6518 pin 7). Here are

300806

FIGURE 1. USB Interface Board

/2 (= 2.5V)

National Semiconductor

Application Note 1906

Hooman Hashemi

October 23, 2008

3. USB Cable

•

Using a ground referenced (AC coupled or no offset adjust

needed) generator with a “Bias-Tee” module which allows

DC value to be set to 2.5V using a fine tuned voltage lab

DC power supply (Note: If necessary, decouple the lab

power supply with an effective Low Pass filter (series R,

shunt C) next to the “Bias-Tee” DC input to ensure little

interference coupling to the signal path).

A Hi-Z buffer which outputs the required mill-volt level AC

signal centered at 2.5V from a ground referenced input

signal. In oscilloscope applications, this Hi-Z buffer is what

interfaces the high impedance oscilloscope probe to the

LMH6518. The LMH6518 datasheet details a circuit which

performs this function.

30080602

www.national.com

Related parts for LMH6518SQEVK

LMH6518SQEVK Summary of contents

Page 1

... LMH6518 pin 7). Here are 19 possible input sources: • Lab generator (or other signal source) capable of 2.5V offset in the presence of milli-volt level input signal © 2008 National Semiconductor Corporation National Semiconductor Application Note 1906 Hooman Hashemi October 23, 2008 3. USB Cable FIGURE 1. USB Interface Board • ...

Page 2

... Setup and Operation 3.1 PRELIMINARY SETUP 1. Prior to installing the LMH6518 evaluation software (which is available for download from National Semiconductor website evaluation board page), you must install Microsoft .NET Framework version 2.0. Point your brows this location: http://www.microsoft.com and search for “.NET Framework” and continue to the page link where “ ...

Page 3

DC voltmeter to measure LMH6518 pin 6 and 7 voltages (or C and R , right hand side pads LMH6518 pin 6 potential (driven input) can be controlled by varying the incoming signal offset (2.5V ...

Page 4

Default device turn-on state: Preamp Low Gain ladder attenuation, Full power mode, Filter full. With the USB Interface board connected, the LMH6518 evaluation board will remain powered on through the interconnect to the USB Interface board, even ...

Page 5

Notes 5 www.national.com ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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