HMC629LP4 - Hittite Microwave Corporation

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Functional Diagram

Electrical Specications,

TA = +25° C, 50 Ohm System, with Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted)

The HMC629LP4(E) is a broadband 4-bit GaAs IC

Digital Attenuator in a low cost leadless SMT package.

This versatile digital attenuator incorporates off-chip

AC ground capacitors for near DC operation, making

it suitable for a wide variety of RF and IF applications.

The dual mode control interface is CMOS/TTL

compatible, and accepts either a three wire serial input

or a 4-bit parallel word. For applications which require

only 33 dB of attenuation range, the HMC629LP4(E)

provides excellent attenuation accuracy up to 10 GHz.

The HMC629LP4(E) is housed in a RoHS compliant

4x4 mm QFN leadless package, and requires no

external matching components.

Parameter Frequency (GHz) Min. Typ. Max. Units

Insertion Loss DC - 6 2.5 5dB

Attenuation Range DC - 6 45 dB

Return Loss (ATTIN, ATTOUT, All Atten. States) DC - 6 17 dB

Attenuation Accuracy: (Referenced to Insertion Loss)

All Attenuation States ± (0.50 + 5% of Atten. Setting) Max. dB

Typical Applications Features

General Description

The HMC629LP4(E) is ideal for:

• Cellular/3G Infrastructure

• WiBro / WiMAX / 4G

• Microwave Radio & VSAT

• Test Equipment and Sensors

• IF & RF Applications

3 dB LSB Steps to 45 dB

Power-Up State Selection

Low Insertion Loss: 2.5 dB

TTL/CMOS Compatible, Serial, Parallel

or Latched Parallel Control

±0.25 dB Typical Step Error

Single +3V or +5V Supply

24 Lead 4x4mm SMT Package: 16mm2

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Output Return Loss

(Only Major States are Shown)

Input Return Loss

(Only Major States are Shown)

Normalized Attenuation

(Only Major States are Shown)

Insertion Loss vs. Temperature

-40

-35

-30

-25

-20

-15

-10

-5

0246810

RETURN LOSS (dB)

FREQUENCY (GHz)

-40

-35

-30

-25

-20

-15

-10

-5

0246810

RETURN LOSS (dB)

FREQUENCY (GHz)

-60

-50

-40

-30

-20

-10

0246810

NORMALIZED ATTENUATION (dB)

FREQUENCY (GHz)

-20

-15

-10

-5

0246810

+25 C

+85 C

-40 C

INSERTION LOSS (dB)

FREQUENCY (GHz)

Bit Error vs. Frequency

(Only Major States are Shown)

Bit Error vs. Attenuation State

-6

-4

-2

0246810

BIT ERROR (dB)

FREQUENCY (GHz)

ALL BITS

BIT 24

-10

-8

-6

-4

-2

0 5 10 15 20 25 30 35 40 45

BIT ERROR (dB)

ATTENUATION STATE (dB)

(7, 8, 10) GHz

(1, 2, 4, 5) 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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Step Error vs. Frequency

(Only Major States are Shown)

-2

-1.5

-1

-0.5

0.5

1.5

0246810

STEP ERROR (dB)

FREQUENCY (GHz)

BIT 24

BIT (3, 6, 12)

ALL BITS

Serial Control Interface

-100

-80

-60

-40

-20

100

012345678910

RELATIVE PHASE (deg)

FREQUENCY (GHz)

(3, 6, 12) dB

24 dB

45 dB

Normal Relative Phase vs. Frequency

The HMC629LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface

is activated when P/S is kept high. The 4-bit serial word must be loaded MSB rst. The positive-edge sensitive CLK

and LE requires clean transitions. If mechanical switches are used, sufficient debouncing should be provided. When

LE is high, 4-bit data in the serial input register is transferred to the attenuator. When LE is high CLK is masked to

prevent data transition during output loading.

When P/S is low, 3-wire SPI interface inputs (SERIN, CLK, LE) are disabled and the input register is loaded with

parallel digital inputs (D0-D5). When LE is high, 4-bit parallel data changes the state of the part per truth table.

For all modes of operations, the state will stay constant while LE is kept low.

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Parallel Mode (Direct Parallel Mode & Latched Parallel Mode)

Note: The parallel mode is enabled when P/S is set to low.

Direct Parallel Mode - The attenuation state is changed by the Control Voltage Inputs directly. The LE (Latch Enable)

must be at a logic high to control the attenuator in this manner.

Latched Parallel Mode - The attenuation state is selected using the Control Voltage Inputs and set while the LE is in

the Low state. The attenuator will not change state while LE is Low. Once all Control Voltage Inputs are at the desired

states the LE is pulsed. See timing diagram below for reference.

Timing Diagram (Latched Parallel Mode)

Bias Voltage

Vdd (Vdc) Idd (Typ.) (mA)

52.0

Control Voltage Input Attenuation State

D3 D2 D1 D0

High High High High Reference

I.L.

High High High Low 3 dB

High High Low High 6 dB

High Low High High 12 dB

Low High High High 24 dB

Any combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.

Truth Table

PUP Truth Table

LE PUP1 PUP2 Attenuation State

0 0 0 45 dB

0 1 0 45 dB

0 0 1 45 dB

011Insertion Loss

1X X 0 to 45 dB

Note: Power-Up with LE= 1 provides direct parallel operation with

D0 - D3.

Parameter Typ.

Min. serial period, tSCK 100 ns

Control set-up time, tCS 20 ns

Control hold-time, tCH 20 ns

LE setup-time, tLN 10 ns

Min. LE pulse width, tLEW 10 ns

Min LE pulse spacing, tLES 630 ns

Serial clock hold-time from LE, tCKN 10 ns

Hold Time, tPH. 0 ns

Latch Enable Minimum Width, tLEN 10 ns

Setup Time, tPS 2 ns

Control Voltage Table

State Vdd = +3V Vdd = +5V

Low 0 to 0.5V @ <1 µA 0 to 0.8V @ <1 µA

High 2 to 3V @ <1 µA 2 to 5V @ <1 µA

Power-Up States

If LE is set to logic LOW at power-up, the logic state of

PUP1 and PUP2 determines the power-up state of the

part per PUP truth table. If the LE is set to logic HIGH

at power-up, the logic state of D3-D0 determines

the power-up state of the part per truth table. The

attenuator latches in the desired power-up state

approximately 200 ms after power-up.

Power-On Sequence

The ideal power-up sequence is: GND, Vdd, digital

inputs, RF inputs. The relative order of the digital

inputs are not important as long as they are powered

after Vdd / GND

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Absolute Maximum Ratings

RF Input Power (DC - 6 GHz) 28 dBm (T = +85 °C)

Digital Inputs (Data, Shift Clock,

Latch Enable & Serial Input) -0.5 to Vdd +0.5V

Bias Voltage (Vdd) 5.6V

Channel Temperature 150 °C

Continuous Pdiss (T = 85 °C)

(derate 10 mW/°C above 85 °C) [1] 0.66 W

Thermal Resistance 98.5 °C/W

Storage Temperature -65 to +150 °C

Operating Temperature -40 to +85 °C

ELECTROSTATIC SENSITIVE DEVICE

OBSERVE HANDLING PRECAUTIONS

Outline Drawing

NOTES:

1. LEADFRAME MATERIAL: COPPER ALLOY

2. DIMENSIONS ARE IN INCHES [MILLIMETERS]

3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.

4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.

PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.

5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.

6. ALL GROUND LEADS AND GROUND PADDLE MUST BE

SOLDERED TO PCB RF GROUND.

7. REFER TO PCB DESIGN AND ASSEMBLY FOR QFN PACKAGES

APPLICATION NOTE FOR SUGGESTED LAND PATTERN.

Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]

HMC629LP4 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] H629

XXXX

HMC629LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] H629

XXXX

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

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

[3] 4-Digit lot number XXXX

Package Information

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Pin Number Function Description Interface Schematic

24 P/S

See truth table, control voltage

table and timing diagram.

1CLK

2SERIN

3LE

4, 15 GND These pins and package bottom

must be connected to RF/DC ground.

5, 14 ATTIN,

ATTOUT

These pins are DC coupled and matched to 50 Ohms.

Blocking capacitors are required. Select value based

on lowest frequency of operation.

6 - 13 ACG1 - ACG6

External capacitors to ground are required. Select value for

lowest frequency of operation. Place capacitor as close to

pins as possible. See Application Circuit.

16 SEROUT Serial input data delayed by 6 clock cycles.

17, 18 PUP2, PUP1

See truth table, control voltage

table and timing diagram.

20 - 23 D3, D2, D1, D0

19 Vdd Supply voltage

Pin Descriptions

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

Application Circuit

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 - DIGITAL - SMT

HMC629LP4 / 629LP4E

v08.0112

3 dB LSB GaAs MMIC 4-BIT

DIGITAL ATTENUATOR, DC - 6 GHz

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 Hit-

tite upon request.

List of Materials for Evaluation PCB 118889 [1]

Item Description

J1, J2 PCB Mount SMA Connector

J10, J12 DC Pin

J11 18 Pin DC Connector

C1 - C2 100 pF, capacitor 0402 pkg

C3 1000 pF, capacitor 0402 pkg

C4 - C8 330 pF, capacitor 0402 pkg

R1 - R10 100 kOhm Resistor, 0402 Pkg.

SW1 SPDT 4 Position DIP Switch

U1 HMC629LP4(E) Digital Attenuator

PCB [2] 118888 Evaluation PCB

[1] Reference this number when ordering complete evaluation PCB

[2] Circuit Board Material: Arlon 25FR