HMC291E - Hittite Microwave Corporation

AttenuAtors - sMt

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

General Description

Features

Functional Diagram

RoHS Compliant Product

4 dB LSB Steps to 12 dB

Single Positive Control Per BIT, 0/+3V

Typical Bit Error : ±0.2 dB

Miniature SOT 26 Package: 9 mm2

Included in the HMC-DK004 Designer’s Kit

Electrical Specications,

TA = +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)

Typical Applications

The HMC291 & HMC291E are general purpose

broadband 2-bit positive control GaAs IC digital

attenuators in 6 lead SOT26 surface mount plastic

packages. Covering 0.7 to 4 GHz, the insertion loss

is typically less than 0.7 to 1.3 dB. The attenuator

bit values are 4 (LSB) and 8 dB for a total attenuation

of 12 dB. Accuracy is excellent at ± 0.2 dB typical

with an IIP3 of up to +54 dBm. Two bit control voltage

inputs, toggled between 0 and +3 to +5 volts, are

used to select each attenuation state at less than 50

uA each. A single Vdd bias of +3 to +5 volts applied

through an external 5K Ohm resistor is required.

The HMC291 & HMC291E are ideal for:

• Cellular

• PCS, ISM, MMDS

• WLL Handset & Base Station

Parameter Frequency Min. Typical Max. Units

Insertion Loss 0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 4.0 GHz

0.7

0.9

1.0

1.1

1.0

1.3

1.4

1.6

Attenuation Range 0.7 - 4.0 GHz 12 dB

Return Loss (RF1 & RF2, All Atten. States) 0.7 - 1.4 GHz

1.4 - 4.0 GHz

Attenuation Accuracy: (Referenced to Insertion Loss)

All Attenuation States

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 4.0 GHz

± 0.3 + 3% of Atten. Setting Max

± 0.2 + 2% of Atten. Setting Max

± 0.2 + 3% of Atten. Setting Max

± 0.4 + 5% of Atten. Setting Max

Input Power for 0.1 dB Compression 5V

0.7 - 4.0 GHz 26

dBm

Input Third Order Intercept Point

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

0.7 - 4.0 GHz 54

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

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

0.7 - 4.0 GHz

560

600

4 dB LSB GaAs MMIC 2-BIT DIGITAL

ATTENUATOR, 0.7 - 4.0 GHz

HMC291 / 291E

v03.0512

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

AttenuAtors - AnALoG - sMt

Absolute Bit Error vs. Attenuation State

Return Loss RF1, RF2 Insertion Loss

Normalized Attenuation

Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.).

Absolute Bit Error vs. Frequency Relative Phase vs. Frequency

-2.5

-2

-1.5

-1

-0.5

0.5 1 1.5 2 2.5 3 3.5 4

+25 C

-40 C

+85 C

INSERTION LOSS (dB)

FREQUENCY (GHz)

-20

-10

0.5 1 1.5 2 2.5 3 3.5 4

4 dB

8 dB

12 dB

RELATIVE PHASE (deg.)

FREQUENCY (GHz)

0.5

1.5

0.5 1 1.5 2 2.5 3 3.5 4

4 dB

8 dB

12 dB

BIT ERROR (dB)

FREQUENCY (GHz)

0.2

0.4

0.6

0.8

4 6 8 10 12

0.9 GHz

1.9 GHz

2.4 GHz

3.5 GHz

BIT ERROR (dB)

ATTENUATION STATE (dB)

-14

-12

-10

-8

-6

-4

-2

0.5 1 1.5 2 2.5 3 3.5 4

4 dB

8 dB

12 dB

NORMALIZED ATTENUATION (dB)

FREQUENCY (GHz)

-35

-30

-25

-20

-15

-10

-5

0.5 1 1.5 2 2.5 3 3.5 4

4 dB

8 dB

12 dB

RETURN LOSS (dB)

FREQUENCY (GHz)

HMC291 / 291E

v03.0512

4 dB LSB GaAs MMIC 2-BIT DIGITAL

ATTENUATOR, 0.7 - 4.0 GHz

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

AttenuAtors - AnALoG - sMt

Control & Bias VoltagesTruth Table

Absolute Maximum Ratings

Outline Drawing

Control Voltage Input Attenuation

Setting

RF1 - RF2

8 dB

4 dB

High High Reference I.L.

High Low 4 dB

Low High 8 dB

Low Low 12 dB

Max. Atten.

Any combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.

State Bias Condition

Low 0 to +0.2V @ 20 uA Max.

High Vdd ± 0.2V @ 50 uA Max.

Note: Vdd = +3V to 5V ± 0.2V

Control Voltage (V1, V2) Vdd + 0.5 Vdc

Bias Voltage (Vdd) +8.0 Vdc

Storage Temperature -65 to +150 °C

Operating Temperature -40 to +85 °C

RF Input Power (0.7 - 4 GHz) +28 dBm

ELECTROSTATIC SENSITIVE DEVICE

OBSERVE HANDLING PRECAUTIONS

NOTES:

1. LEADFRAME MATERIAL: COPPER ALLOY

2. DIMENSIONS ARE IN INCHES [MILLIMETERS].

3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE.

4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE.

5. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.

Package Information

Part Number Package Body Material Lead Finish MSL Rating Package Marking

HMC291 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] H291

XXXX

HMC291E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 291E

XXXX

[1] Max peak reow temperature of 235 °C

[2] Max peak reow temperature of 260 °C

HMC291 / 291E

v03.0512

4 dB LSB GaAs MMIC 2-BIT DIGITAL

ATTENUATOR, 0.7 - 4.0 GHz

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

AttenuAtors - AnALoG - sMt

Application Circuit

DC blocking capacitors C1 & C2 are required on RF1 &

RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest

customer specic frequency to pass with minimal loss.

R1 = 5K Ohm is required to supply voltage to the circuit

through either PIN 3 or PIN 1.

HMC291 / 291E

v03.0512

4 dB LSB GaAs MMIC 2-BIT DIGITAL

ATTENUATOR, 0.7 - 4.0 GHz

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 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

as shown is available from Hittite Microwave Corpo-

ration upon request.

List of Materials for Evaluation PCB 103372 [1]

Item Description

J1 - J2 PCB Mount SMA Connector

J3 - J6 DC Pin

R1 5 kOhm Resistor, 0402 Chip

R2, R3 100 Ohm Resistor, 0402 Chip

C1, C2

0402 Chip Capacitor, Select for Lowest

Frequency of

Operation

U1 HMC291 / HMC291E Digital Attenuator

PCB [2] 103370 Evaluation PCB 1.5” x 1.5”

[1] Reference this number when ordering complete evaluation PCB

[2] Circuit Board Material: Rogers 4350

Evaluation Circuit Board

* R2 = R3 = 100 Ohm.

These resistors are optional

and may be used to enhance

decoupling of the RF path

from the control inputs.