hittite HMC305LP4 User Manual

HMC305LP4 / 305LP4E

v03.0809

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz

0.5 dB LSB GaAs MMIC 5-BIT SERIAL

5

ATTENUATORS - DIGITAL - SMT

Typical Applications

The HMC305LP4 / HMC305LP4E is ideal for:

• Cellular/3G Infrastructure

• Fixed Wireless, WiMax & WiBro

• Test Instrumentation

Functional Diagram

Features

0.5 dB LSB Steps to 15.5 dB

CMOS Compatible Serial Data Interface

SPI Compatible Serial Output

±0.3 dB Typical Bit Error

24 Lead 4x4mm QFN Package: 16mm



Included in the HMC-DK004 Designer’s Kit

General Description

The HMC305LP4 & HMC305LP4E are broadband
5-bit positive control GaAs IC digital attenuators with
CMOS compatible serial-to-parallel drivers packaged
in leadless QFN 4x4 mm SMT packages. Covering

0.7 to 3.8 GHz, the insertion loss is typically less
than 1.5 to 2 dB. The attenuator bit values are 0.5
(LSB), 1, 2, 4, and 8 dB for a total attenuation of

15.5 dB. Attenuation accuracy is excellent at ±0.25
dB typical with an IIP3 of up to +52 dBm. Five bit
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.

5 - 60

Electrical Speci cations, T

Parameter Frequency Min. Typical Max. Units

Insertion Loss

Attenuation Range 0.7 - 3.8 GHz 15.5 dB

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

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

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 - 3.8 GHz

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 3.8 GHz

0.7 - 0.9 GHz

0.9 - 2.2 GHz

2.2 - 3.8 GHz

Vcc = 5V
Vcc = 3V

Vcc = 5V
Vcc = 3V

0.7 - 3.8 GHz

0.7 - 3.8 GHz

0.7 - 3.8 GHz

1. 2

1. 5

1. 8

2.0

17
18
19
15

± (0.5 +5% of Atten. Setting) Max
± (0.3 +4% of Atten. Setting) Max
± (0.5 +5% of Atten. Setting) Max

25
23

52
48

750
830

1. 5

2.0

2.3

2.5

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
dB

dB
dB
dB

dBm
dBm

dBm
dBm

ns
ns

1

HMC305LP4 / 305LP4E

v03.0809

0.5 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz

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

Normalized Attenuation

(Only Major States are Shown)

0

-2

-4

-6

-8

-10

-12

-14

NORMALIZED ATTENUATION (dB)

-16

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

Return Loss RF1, RF2

(Only Major States are Shown)

0

-5

-10

-15

-20

RETURN LOSS (dB)

-25

-30

0.5 1 1.5 2 2.5 3 3.5 4

1 dB

8 dB2 dB 15.5 dB0.5 dB

FREQUENCY (GHz)

I.L.

Bit Error
vs. Attenuation State

1

0.75

0.5

0.25

0

BIT ERROR (dB)

-0.25

-0.5
02468101214

3.5 GHz

2.4 GHz

0.9 GHz1.9 GHz

5

4 dB

ATTENUATORS - DIGITAL - SMT

Bit Error vs. Frequency

(Only Major States are Shown)

3

2

8 dB

1

15.5 dB

BIT ERROR (dB)

0

-1

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

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]

0.5, 1, 2, 4 dB

Relative Phase vs. Frequency

(Only Major States are Shown)

60

40

20

0

-20

RELATIVE PHASE (deg.)

-40

-60
0 0.5 1 1.5 2 2.5 3 3.5 4

Order On-line at www.hittite.com

15.5 dB

0.5, 1, 2, 4, 8 dB

FREQUENCY (GHz)

5 - 61

HMC305LP4 / 305LP4E

v03.0809

0.5 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz

5

ATTENUATORS - DIGITAL - SMT

Worst Case Step Error
Between Successive Attenuation States

1.2

0.8

0.4

0

-0.4

STEP ERROR (dB)

-0.8

-1.2

0.5 1 1.5 2 2.5 3 3.5 4

FREQUENCY (GHz)

Timing

Parameter

Serial Input Setup
Time

Hold time from Serial
Input to Shift Clock

Setup time from
Shift Clock to Latch
Enable

Propagation delay,
Latch Enable to C0.5
through C8

Setup time from
Reset to Shift Clock

Clock Frequency
(1/t cl k)

Symbol Vcc = +5V Vcc = +3V Units

Min. Max. Min. Max.

ts 20 - 100 - ns

th 0 - 5 - ns

tlsup 40 - 100 - ns

tpd - 30 - 70 ns

-20-50-ns

fclk - 30 - 10 MHz

Digital Control Voltages

State Vcc = +5V Vcc = +3V

Low 0 to 1.3V 0 to 0.7V

High 3.5 to 5V 2.3 to 3V

Serial Input Truth Table

Latch

Enable

X X L Shift register cleared

X



Shift

Clock



Reset Function

H Shift register clocked

XH

Contents of shift register

transferred to Digital

Attenuator

Truth Table

Serial Control Input Attenuation

C 0.5 C 1 C 2 C 4 C 8

High High High High High

Low High High High High 0.5 dB

High Low High High High 1 dB

High High Low High High 2 dB

High High High Low High 4 dB

High High High High Low 8 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.

15.5 dB

Max. Atten.

5 - 62

Timing Diagram

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