Datasheet HMC291 Datasheet (Hittite)

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

HMC291

2

ATTENUATORS

SMT

FEBRUARY 2001

Features

4 dB LSB STEPS to 12 dB
SINGLE POSITIVE CONTROL PER BIT, 0/+3V
+/- 0.2 dB TYPICAL BIT ERROR
MINIATURE SOT 26 PACKAGE: 9 mm²

V00.0600

General Description

The HMC291 is a broadband 2 - bit positive
control GaAs IC digital attenuator in a 6 lead
SOT26 surface mount plastic package. 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 5KΩ resistor is required.
The HMC291 is ideal for cellular, PCS, ISM,
MMDS, and WLL handset & basestation appli­cations. Occupying less than 9 mm², this is the
smallest 2 - bit digital attenuator available.

Guaranteed Performance

With Vdd =+3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated), -40 to +85 deg C

Parameter Frequency Min. Typ. Max. Units

0.7 -1.4 GHz

Insertion Loss

Attenuation Range 0.7 - 4.0 GHz 12 dB
Return Loss (RF1 & RF2, All Atten.States)

Attenuation Accuracy:(Referenced to Insertion Loss)
All Attenuation States

All Attenuation States
All Attenuation States
All Attenuation States

InputPower for 0.1 dB Compression 5V3V0.7 - 4.0 GHz 26
InputThird Order Intercept Point

(Tw o-Tone InputPower = 0dBm Each)
Switching Characteristics

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

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 4.0 GHz

0.7 - 1.4 GHz

1.4 - 4.0 GHz

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 4.0 GHz

5V3V0.7 - 4.0 GHz 54

0.7 - 4.0 GHz

14
16

± 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

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0.7

0.9

1.0

1.1

17
22

22
50

560
600

1.0

1.3

1.4

1.6

dB
dB
dB
dB

dB
dB

dB
dB
dB
dB

dBm
dBm

dBm
dBm

ns
ns

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

HMC291

V00.0600

Insertion Loss

0

-40 C

-0.5

-1

-1.5

INSERTION LOSS (dB)

-2

-2.5

0.5 1 1.5 2 2.5 3 3.5 4

+85 C

FREQUENCY (GHz)

Normalized Attenuation

0

-2

-4

-6

-8

-10

-12

NORMALIZED INSERTION LOSS (dB)

-14

0.5 1 1.5 2 2.5 3 3.5 4

4dB

8dB

12 dB

FREQUENCY (GHz)

+25 C

FEBRUARY 2001

Return Loss RF1, RF2

0

-5

-10

-15

-20

RETURN LOSS (dB)

-25

-30

-35

0.5 1 1.5 2 2.5 3 3.5 4

4dB

8dB

FREQUENCY (GHz)

Absolute Bit Error vs
Attenuation State

1

0.8

0.6

0.4

BIT ERROR (dB)

0.2

0

0.9 GHz

4 6 8 10 12

ATTENUATION STATE (dB)

3.5 GHz

12 dB

2

ATTENUATORS

SMT

2.4 GHz

1.9 GHz

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

S-Parameter data is available On-Line at www.hittite.com

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

2 - 69

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

HMC291

2

ATTENUATORS

SMT

FEBRUARY 2001

Absolute Bit Error vs Frequency

2

1.5

1

BIT ERROR (dB)

0.5

0

0.5 1 1.5 2 2.5 3 3.5 4

4dB

FREQUENCY (GHz)

12 dB

8dB

Functional Diagram/
Application Circuit

PIN NUMBER

100 pF

RF2

100 pF

RF1

C1

C2

GND

R1

1

4 dB

2

8 dB

3

5 k W

Vdd

V00.0600

Relative Phase vs Frequency

60
50
40
30
20
10

0

RELATIVE PHASE (deg.)

-10

-20

0.5 1 1.5 2 2.5 3 3.5 4

12 dB

FREQUENCY (GHz)

8dB

4dB

T ruth Table

Control Voltage

Input

V1

8dB

6

5

4

V2

N/C

V1

High High

High Low 4 dB

Low High 8 dB

Low Low

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

V2

4dB

Attenuation

Setting

RF1 -RF2

Reference

I.L.

12 dB

Max Atten.

Control & Bias

DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2
= 100 ~ 300 pF to allow lowest customer specific frequency to pass with
minimal loss. R1 = 5KΩ is required to supply voltage to the circuit through
either PIN 3 or PIN 1.

Voltages

State Bias Con dition

Low 0 to +0.2V@ 20 uA Max

High Vdd±0.2V@50uATyp

Note: Vdd = +3V to +5V ± 0.2V

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

2 - 70

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

HMC291

V00.0600

Absolute Maximum Ratings

Control Voltage (V1, V2) Vdd + 0.5 Vdc
B ias Voltage (Vdd) +8.0 Vdc

Storage Temperature -65 to +150 deg C
Operating Temperature -40 to +85 deg C
RF InputPower(0.7- 4GHz) +28 dBm

Outline

FEBRUARY 2001

2

ATTENUATORS

SMT

1. MATERIAL:
A) PACKAGE BODY - LOW STRESS INJECTION-MOLDED PLASTIC.
B) LEADFRAME MATERIAL: COPPER ALLOY

2 . PLATING : LEAD - TIN SOLDER PLATE

3. DIMENSIONS ARE IN INCHES (MILLIMETERS).
UNLESS OTHERWISE SPECIFIED ALL TOL. ARE ±0.005(±0.13).

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15 MM PER SIDE

5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25 MM PER SIDE

2 - 71

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

HMC291

2

ATTENUATORS

SMT

FEBRUARY 2001

Evaluation Circuit Board

V00.0600

* R2 = R3 = 100 Ω .
These resistors are optional and

may be used to enhance
decoupling of the RF path from
the control inputs.

The circuit board used in the final 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 above. 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 upon request.

Evaluation Circuit Board Layout Design Details

Item Description

J1 - J2 PC Mount SMA Connector
J3 - J6 DC Pin
R1 5k Ω Resistor, 0402 Chip
R2, R3 100 Ω Resistor, 0402 Chip
C1, C2 0402 Chip Capacitor, Select for

Lowest Frequency of Operation
U1 HMC291 Digital Attenuator
PCB* 103370 Evaluation PCB 1.5" x 1.5"

*Circuit Board Material: Rogers 4350

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

2 - 72

MICROWAVE CORPORATION

4 dB LSB GaAs IC 2 - BIT DIGITAL ATTENUATOR 0.7 - 4.0 GHz

NOTES:

HMC291

FEBRUARY 2001

2

ATTENUATORS

SMT

12 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone] Web Site: www.hittite.com

2 - 73