Datasheet HMC271LP4 Datasheet (hittite)

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HMC271LP4 / 271LP4E

v02.0705

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

9

ATTENUATORS - SMT

Typical Appli cations

The HMC271LP4 / HMC271LP4E is ideal for:

• Cellular/3G Infrastructure

• Fixed Wireless & WiMax

• Test Instrumentation

Functional Diagram

Features

1 dB LSB Steps to 31 dB

CMOS Compatible Serial Data Interface

SPI Compatible Serial Output

+/- 0.4 dB Typical Bit Error

4 x 4 mm

QFN Plastic Package

General Description

The HMC271LP4 & HMC271LP4E are broadband 5­bit positive control GaAs IC digital attenuators with
serial-to-parallel drivers in low cost leadless QFN
4x4 mm SMT packages. Covering 0.7 to 3.7 GHz,
the insertion loss is typically less than 2.5 dB. The
attenuator bit values are 1 (LSB), 2, 4, 8, and 16 dB
for a total attenuation of 31 dB. Accuracy is excellent
at ± 0.4 dB typical with an IIP3 of up to +48 dBm. Five
bit CMOS compatible serial control words are used to
select each attenuation state. A single Vcc bias of +3V
to +5V applied through an external 5k Ohm resistor is
required.

9 - 14

Electrical Specifications, T

Parameter Frequency Min. Typical Max. Units

Insertion Loss

Attenuation Range 0.7 - 3.7 GHz 31 dB

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

Attenuation Accuracy: (Referenced to Inser tion Loss)
All Attenuation States 0.7 - 3.7 GHz ± 0.4 ± 5% of Atten. Setting Max dB

Input Power for 0.1 dB Compression

Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)

Switching Characteristics

tRISE, tFALL (10/90% RF)
tON, tOFF (Latch Enable to 10/90% RF)

= +25° C, Vcc = +3V to +5V

A

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 3.7 GHz

0.7 - 1.4 GHz

1.4 - 2.7 GHz

2.7 - 3.7 GHz

Vcc = 5V
Vcc = 3V

Vcc = 5V
Vcc = 3V

0.7 - 3.7 GHz

0.7 - 3.7 GHz

0.7 - 3.7 GHz

1.9

2.3

2.6

2.8

12
15
16

24
22

48
46

750
830

2.4

2.8

3.1

3.3

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

dB
dB
dB
dB

dB
dB
dB

dBm
dBm

dBm
dBm

ns
ns

Insertion Loss

0

-0.5

-1

-1.5

-2

-2.5

INSERTION LOSS (dB)

-3

-3.5

-4

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

+25C
+85C

-40C

HMC271LP4 / 271LP4E

v02.0705

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

1 dB LSB GaAs MMIC 5-BIT SERIAL

Return Loss RF1, RF2

(Only Major States are Shown)

0

-5
16 dB 31 dB

-10

-15

-20

RETURN LOSS (dB)

2 dB

-25

-30

0.5 1 1.5 2 2.5 3 3.5 4

8 dB4 dB

1 dB

I.L.

FREQUENCY (GHz)

9

Normalized Attenuation

(Only Major States are Shown)

0

-5

-10

-15

-20

-25

-30

NORMALIZED ATTENUATION (dB)

-35

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

Bit Error vs. Frequency

(Only Major States are Shown)

4

3

2

1

BIT ERROR (dB)

0

-1

16 dB

31 dB

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

Bit Error
vs. Attenuation State

2

1.5

1

0.5

0

BIT ERROR (dB)

-0.5

-1

02468101214161820222426283032

0.9 GHz

ATTENUATION STATE (dB)

1.9 GHz

3.5 GHz

2.4 GHz

ATTENUATORS - SMT

Relative Phase vs. Frequency

(Only Major States are Shown)

100

75

50

1, 2, 4 dB8 dB

25

0

-25

-50

RELATIVE PHASE (deg.)

-75

-100
0 0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

31 dB

16 dB

1, 2, 4, 8 dB

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

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

9 - 15

9

v02.0705

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

Worst Case Step Error
Between Successive Attenuation States

1.2

1

0.8

0.6

0.4

0.2

0

-0.2

-0.4

STEP ERROR (dB)

-0.6

-0.8

-1

-1.2

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

HMC271LP4 / 271LP4E

1 dB LSB GaAs MMIC 5-BIT SERIAL

CMOS Control Voltages

State Vcc = +5V Vcc = +3V

Low 0 to 1.3V 0 to 0.7V

High 3.5 to 5.0V 2.3 to 3.0V

Serial Input Truth Table

Latch

Enable

X X L Shift register cleared

X

Ç

Shift
Lock

Ç

Reset Function

HShift register locked

XH

Contents of shift register

transferrred to output latches

ATTENUATORS - SMT

Timing

Parameter

Serial IN Setup Time ts 20 - 100 - ns

Hold time from Serial
In to Shift Clock

Setup time from
Shift clock to Latch
Enable

Propogation delay,
Latch enable to Qa
through Qh

Setup time from
Reset to Shift Clock

Clock Frequency
(1/t cl k)

Symbol Vcc = +5V Vcc = +3V Unit

Min. Max. Min. Max.

th 0 - 5 - ns

tlsup 40 - 100 - ns

tpd - 30 - 70 ns

-20-50-ns

fclk - 30 - 10 MHz

Timing Diagram

Truth Table

Serial Data Input Attenuation

C1 C2 C4 C8 C16

High High High High High

Low High High High High 1 dB

High Low High High High 2 dB

High High Low High High 4 dB

High High High Low High 8 dB

High High High High Low 16 dB

Low Low Low Low Low

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

Setting

RF1 - RF2

Reference

I.L.

31 dB

Max. Atten.

9 - 16

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

v02.0705

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

Absolute Maximum Ratings

Digital Inputs (Reset, Shift Clock,
Latch Enable & Serial In)

Digital Outputs (Serial Out) -0.5 to (Vcc+0.5)Vdc

DC Current on Serial Output ±35mA

Bias Voltage (Vcc) +7.0 Vdc

Storage Temperature -65 to +150 °C

Operating Temperature -40 to +85 °C

RF Input Power (0.7 - 3.7 GHz) +26 dBm

ESD Sensitivity (HBM) Class 1A

Outline Drawing

-1.5 to (Vcc + 1.5) Vdc

HMC271LP4 / 271LP4E

1 dB LSB GaAs MMIC 5-BIT SERIAL

ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS

9

NOTES:

1. LEADFRAME MATERIAL: COPPER ALLOY

2. DIMENSIONS ARE IN INCHES [MILLIMETERS]

3. LEAD SPACING TOLERANCE IS NON -CUM ULATIVE

4. PAD BURR LENGTH S HALL BE 0.15mm MA XIMUM.

PAD BURR HEIGH T SHALL BE 0. 05mm MA XIMUM.

5. PACKAGE WARP SH ALL NOT EXCEED 0.05mm.

6. ALL GROUND LEADS AND GROUND PADDLE MUST B E

SOLDERED TO PCB RF GROU ND.

7. REFER TO HITTITE APPL ICATION NOTE FOR SUGGESTED

LAND PATTERN.

Package Information

Part Number Package Body Material Lead Finish MSL Rating Package Marking

HMC271LP4 Low Stress Injection Molded Plastic Sn /Pb Solder

HMC271LP4E RoHS -compliant Low Stress Injection Molded Plastic 100% matte Sn

[1] Max peak re ow temperature of 23 5 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX

MSL1

MSL1

[1]

[2]

ATTENUATORS - SMT

[3]

H271

XXXX

H271

XXXX

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

9 - 17

Pin Descriptions

HMC271LP4 / 271LP4E

v02.0705

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

9

ATTENUATORS - SMT

Pin Number Function Description Interface Schematic

1, 3, 4, 6, 10, 12, 13,

15, 16, 18

2, 17 RF1, RF2

5 Serial Out

7 Reset

8 Shift clock

9 Latch Enable

11 Serial In

N/C

These pins should be connected to PCB RF ground to

maximize performance.

This pin is DC coupled and matched to 50 Ohms

Blocking capacitors are required. Select value based on lowest

frequency of operation.

Serial data output. Serial input data

delayed by 8 clock cycles.

See truth table, control voltage table and timing diagram.

9 - 18

14 Vcc Supply Voltage.

19 - 24 GND

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Package bottom has an exposed metal paddle that must also

be connected to RF/DC Ground.

Order On-line at www.hittite.com

Application Circuit

HMC271LP4 / 271LP4E

v02.0705

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

9

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 2 or PIN 17.

ATTENUATORS - SMT

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

9 - 19

9

HMC271LP4 / 271LP4E

v02.0705

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

Logic / Functional Diagram

ATTENUATORS - SMT

Programming Example to Select 1 dB State

9 - 20

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

Evaluation Circuit Board

HMC271LP4 / 271LP4E

v02.0705

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

9

List of Materials for Evaluation PCB 108782

Item Description

J1 - J2 PCB Mount SMA Connector

J3 2 mm Molex Header

C1, C2 100 pF Capacitor, 0402 Pkg.

C3 0.01 μF Capacitor, 0402 Pkg.

R1 5k Ohm Resistor, 0402 Pkg.

U1

[2]

PCB

[1] Reference this number when ordering complete evaluation PCB

[2] Circuit Board Material: Rogers 4350

HMC271LP4 / HMC271LP4E
Digital Attenuator

108780 Evaluation PCB

The circuit board used in the  nal application
should use RF circuit design techniques. Signal
lines should have 50 ohm impedance while the
package ground leads and exposed ground paddle
should be connected directly to the ground plane
similar to that shown below. A suf cient 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 Corpo­ration upon request.

ATTENUATORS - SMT

[1]

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]

Order On-line at www.hittite.com

9 - 21