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HMC424LP3E Attenuators: Datasheet, Circuit, Pinout [FAQ]

Author: Irene
Date: 6 May 2022
 69
HMC424LP3E Circuit

Product Overview

The HMC424LP3 & HMC424LP3E are broadband 6-bit GaAs IC digital attenuators in low cost leadless surface mount packages. Covering DC to 13 GHz, the insertion loss is less then 4 dB typical. The attenuator bit values are 0.5 (LSB), 1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB. Attenuation accuracy is excellent at ± 0.5 dB typical step error with an IIP3 of +32 dBm. Six control voltage inputs, toggled between 0 and -5V, are used to select each attenuation state. A single Vee bias of -5V allows operation at frequencies down to DC.

 

This blog will introduce HMC424LP3E systematically from its features, pinout to its specifications, applications, also including HMC424LP3E datasheet and so much more.

 

Catalog

Product Overview

HMC424LP3E Features

HMC424LP3E Applications

HMC424LP3E Functional Diagram

Electrical Specification

Truth Table

Absolute Maximum Ratings

Outline Drawing

Pin Description

Suggested Driver Circuit

Evaluation PCB

HMC424LP3E Manufacturer

HMC424LP3E Datasheet

Using Warnings

HMC424LP3E FAQ

 

HMC424LP3E Features

  • 5 dB LSB Steps to 31.5 dB
  • Single Control Line Per Bit
  • ± 5 dB Typical Bit Error
  • 9mm2Leadless SMT Plastic Package

 

HMC424LP3E Applications

  • The HMC424LP3 / HMC424LP3E is ideal for:
  • Basestation Infrastructure
  • Fiber Optics & Broadband Telecom
  • Microwave & VSAT Radios
  • Military & Space
  • Test Instrumentation

 

HMC424LP3E Functional Diagram

The following figure is the diagram of HMC424LP3E functional diagram.

 

HMC424LP3E Functional Diagram

HMC424LP3E Functional Diagram

 

Electrical Specification

Parameter

Frequency (GHz)

Min.

Typ.

Max.

Units

 

DC - 4 GHz

 

3.1

3.8

dB

Insertion Loss

4.0 - 8.0 GHz

3.5

4.0

dB

 

8.0 - 13.0 GHz

4.0

4.6

dB

Attenuation Range

DC - 13.0 GHz

 

31.5

 

dB

Return Loss (RF1 & RF2, All Atten. States)

DC - 13.0 GHz

9

12

 

dB

Attenuation Accuracy: (Referenced to Insertion Loss)

 

0.5 - 15.5 dB States 16 - 31.5 dB States

 

DC - 13.0 GHz DC - 13.0 GHz

 

± (0.3 + 3% of Atten. Setting) Max

± (0.3 + 5% of Atten. Setting) Max

 

dB dB

Input Power for 0.1 dB Compression

1.0 - 13.0 Ghz

 

22

 

dBm

Input Third Order Intercept Point

REF State

 

1.0 - 13.0 Ghz

 

46

 

dBm

(Two-Tone Input Power= 0 dBm Each Tone)

All Other States

32

dBm

Switching Characteristics

DC - 13.0 GHz

 

 

 

30

50

 

 

 

ns ns

tRISE, tFALL (10/90% RF) tON/tOFF (50% CTL to 10/90% RF)

 

 

Insertion Loss

Insertion Loss

 

Return Loss RF1, RF2

Return Loss RF1, RF2

 

Normalized Attenuation

Normalized Attenuation

 

Bit Error vs. Attenuation State 

Bit Error vs. Attenuation State 

 

Bit Error vs. Frequency

Bit Error vs. Frequency

 

Relative Phase vs. Frequency

Relative Phase vs. Frequency

 

Bias Voltage & Current

Vee Range= -5 Vdc ± 10%

Vee (VDC)

Iee (Typ.) (mA)

Iee (Max.) (mA)

-5

2

5

 

Control Voltage

State

Bias Condition

Low

0 to -3V @ 35 µA Typ.

High

Vee to Vee +0.8V @ 5 µA Typ.

 

Truth Table

Control Voltage Input

Attenuation State

RF1 - RF2

V1 16 dB

V2

8 dB

V3

4 dB

V4

2 dB

V5

1 dB

V6

0.5 dB

 

 

Low

 

Low

 

Low

 

Low

 

Low

 

Low

Reference I.L.

Low

Low

Low

Low

Low

High

0.5 dB

Low

Low

Low

Low

High

Low

1 dB

Low

Low

Low

High

Low

Low

2 dB

Low

Low

High

Low

Low

Low

4 dB

Low

High

Low

Low

Low

Low

8 dB

High

Low

Low

Low

Low

Low

16 dB

High

High

High

High

High

High

31.5 dB

Any Combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.

 

Absolute Maximum Ratings

Control Voltage (V1 to V6)

Vee - 0.5 Vdc

Bias Voltage (Vee)

-7 Vdc

Channel Temperature

150 °C

Thermal Resistance

330 °C/W

Storage Temperature

-65 to + 150 °C

Operating Temperature

-55 to +85 °C

RF Input Power (0.5 - 13 GHz)

+25 dBm

 

Outline Drawing

The following diagram shows the outline drawing of HMC424LP3E.

 

HMC424LP3E Outline Drawing

HMC424LP3E Outline Drawing

 

Package Information

Part Number

Package Body Material

Lead Finish

MSL Rating

Package Marking [3]

HMC424LP3

Low Stress Injection Molded Plastic

Sn/Pb Solder

MSL1 [1]

424

XXXX

HMC424LP3E

RoHS-compliant Low Stress Injection Molded Plastic

100% matte Sn

MSL1 [2]

424

XXXX

 

Pin Description

Pad Number

Function

Description

 

1, 3, 10, 12

 

GND

 

Package bottom has an exposed metal paddle that must also be connected to RF ground

 

2, 11

 

RFIN, RFOUT

This pin is DC coupled and matched to 50 Ohm. Blocking capacitors are required if RF line potential is not equal to 0V.

 

 

 

4, 5, 6, 7, 8, 9

 

 

 

V6 - V1

 

 

 

See truth table and control voltage table.

 

13, 14, 16

 

N/C

 

This pin should be connected to PCB RF ground to maximize performance

 

 

15

 

 

VEE

 

Supply Voltage -5V ± 10%

 

Suggested Driver Circuit

The following is the circuit diagram of HMC424LP3E.

 

HMC424LP3E Circuit Diagram

HMC424LP3E Circuit Diagram

 

Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current.

* Recommended value to suppress unwanted RF signals at V1 - V6 control lines.

 

Evaluation PCB

The following figure is the evaluation PCB.

 

Evaluation PCB

Evaluation PCB

 

List of Materials for Evaluation PCB 105406

Item

Description

J1 - J2

PCB Mount SMA Connector

J3

8 Pin DC Connector

C1

0.01 µF Capacitor, 0603 Pkg.

R1 - R6

100 Ohm Resistor, 0603 Pkg.

U1

HMC424LP3 / HMC424LP3E Digital Attenuator

PCB [2]

105245 Evaluation PCB

 

The circuit board used in the application should use RF circuit design techniques. Signal lines should have 50 Ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and bottom ground planes. The evaluation circuit board shown is available from Hittite upon request.

 

HMC424LP3E Manufacturer

Analog Devices (NASDAQ: ADI) is a world leader in the design, manufacture, and marketing of a broad portfolio of high performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment.

 

HMC424LP3E Datasheet

You can download HMC424LP3E datasheet from the link given below:

HMC424LP3E Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

HMC424LP3E FAQ

What are the HMC424LP3 & HMC424LP3E broadband 6-bit GaAs IC digital attenuators?

Low cost leadless surface mount packages.

 

How much DC does the HMC424LP3 & HMC424LP3E cover?

13 GHz.

 

How many control voltage inputs are used to select each attenuation state?

0 and -5V.

 

What is an attenuator used for?

Attenuators are electrical components designed to reduce the amplitude of a signal passing through the component, without significantly degrading the integrity of that signal. They are used in RF and optical applications.

 

What is an attenuator?

An attenuator is an electric device that reduces the power of a signal without degrading its integrity. Simply put, an electrical/electronic attenuation device is one that reduces the electrical/electronic energy passing through by diverting some of the energy to either heat or ground.

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