HMC540LP3 / 540LP3E
v00.0605
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
5
Typical Applications
Features
The HMC540LP3 / HMC540LP3E is ideal for both RF
and IF applications:
1 dB LSB Steps to 15 dB
0.2 dB Typical Step Error
Low Insertion Loss: 1 dB
High IP3: +50 dBm
• Cellular Infrastructure
• ISM, MMDS, WLAN, WiMAX, WiBro
• Microwave Radio & VSAT
Single Control Line Per Bit
TTL/CMOS Compatible Control
Single +5V Supply
• Test Equipment and Sensors
Functional Diagram
3x3 mm SMT Package
General Discription
The HMC540LP3 & HMC540LP3E are broadband
4-bit GaAs IC digital attenuators in low cost leadless
surface mount packages. This single positive control
line per bit digital attenuator utilizes off chip AC
ground capacitors for near DC operation, making it
suitable for a wide variety of RF and IF applications.
Covering DC to 5.5 GHz, the insertion loss is less
than 1 dB typical. The attenuator bit values are
1 (LSB), 2, 4 and 8 dB for a total attenuation of 15 dB.
Attenuation accuracy is excellent at 0.2 dB typical
step error. The attenuator also features a IIP3 of +50
dBm. Four TTL/CMOS control inputs are used to
select each attenuation state. A single Vdd bias of
+5V is required.
Electrical Specifications,
TA = +25° C, With Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted)
Parameter
Frequency (GHz)
Min.
Typ.
Max.
Units
DC - 2.0 GHz
2.0 - 3.0 GHz
3.0 - 4.0 GHz
4.0 -5.5 GHz
0.8
1.0
1.3
2.2
1.1
1.3
1.6
2.6
dB
dB
dB
dB
Insertion Loss
Attenuation Range
DC - 5.5 GHz
15
dB
DC - 3.5 GHz
3.5 - 5.5 GHz
20
15
dB
dB
Return Loss (RF1 & RF2, All Atten. States)
DC - 1.0 GHz
1.0 - 4.0 GHz
4.0 - 5.0 GHz
5.0 - 5.5 GHz
(0.2 + 2% of Atten. Setting) Max.
(0.2 + 3% of Atten. Setting) Max.
(0.3 + 5% of Atten. Setting) Max.
(0.4 + 8% of Atten. Setting) Max.
dB
dB
dB
dB
Attenuation Accuracy:
(Referenced to Insertion Loss)
All States
Input Power for 0.1 dB Compression
0.1 - 5.5 GHz
0.1 - 5.5 GHz
27
dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
REF - 4 dB States
5 - 15 dB States
50
45
dBm
dBm
Switching Characteristics
DC -5.5 GHz
tRISE, tFALL (10/90% RF)
95
100
ns
ns
tON, tOFF (50% CTL to 10/90% RF)
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
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