HMC542LP4
/
542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
The HMC542LP4(E) is ideal for:
• Cellular/PCS/3G Infrastructure
• ISM, MMDS, WLAN, WiMAX, & WiBro
• Microwave Radio & VSAT
• Test Equipment and Sensors
Features
0.5 dB LSB Steps to 31.5 dB
TTL/CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
± 0.25 dB Typical Step Error
Single +5V Supply
24 Lead 4x4mm QFN Package: 16mm2
Functional Diagram
General Description
The HMC542LP4(E) is a broadband 6-bit GaAs IC
digital attenuator with a CMOS compatible serial
to parallel driver in low cost leadless surface mount
package. This serial control digital attenuator incorp
rates off chip AC ground capacitors for near DC opera-
tion, making it suitable for a wide variety of RF and IF
applications. Covering DC to 3 GHz, the insertion loss
is 1.5 dB and the attenuator bit values are 0.5 (LSB),
1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB.
Attenuation accuracy is excellent at ±0.25 dB typi-
cal step error with an IIP3 of +45 dBm. Six bit serial
control words are used to select each attenuation
state. A single Vdd bias of +5V is required.
Electrical Specifi cations,
T
A
= +25° C, with Vcc = +5V
Parameter
Insertion Loss
Attenuation Range
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
0.5 - 3.5 dB States
4.0 - 31.5 dB States
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
DC - 3 GHz
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
800
900
ns
ns
Frequency (GHz)
DC - 1.5 GHz
1.5 - 3.0 GHz
DC - 3 GHz
DC - 3 GHz
Min.
Typ.
1.2
1.5
31.5
17
Max.
1.5
1.8
Units
dB
dB
dB
dB
DC - 1.0 GHz
1.0 - 2.2 GHz
1.0 - 2.2 GHz
2.2 - 3.0 GHz
0.1 - 3.0 GHz
0.1 - 1.5 GHz
1.5 - 3.0 GHz
± (0.20 + 3% of Atten. Setting) Max.
± (0.25 + 3% of Atten. Setting) Max.
± (0.15 + 4% of Atten. Setting) Max.
± (0.30 + 3% of Atten. Setting) Max.
20
35
45
dB
dB
dB
dB
dBm
dBm
dBm
5 - 198
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HITTITE [ HITTITE MICROWAVE CORPORATION ]
