5
5 - 170
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20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
Functional Diagram
Electrical Specifi cations,
T
A
 = +25?C, With Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted) 
The HMC540LP3 / HMC540LP3E is ideal for both RF
and IF applications:
" Cellular Infrastructure
" ISM, MMDS, WLAN, WiMAX, WiBro
" Microwave Radio & VSAT
" Test Equipment and Sensors
1 dB LSB Steps to 15 dB
?0.2 dB Typical Step Error
Low Insertion Loss: 1 dB
High IP3: +50 dBm
Single Control Line Per Bit
TTL/CMOS Compatible Control
Single +5V Supply
3x3 mm SMT Package
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.
Parameter
Frequency (GHz)
Min.
Typ.
Max.
Units
Insertion Loss
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
Attenuation Range
DC - 5.5 GHz
15
dB
Return Loss (RF1 & RF2, All Atten. States)
DC - 3.5 GHz
3.5 - 5.5 GHz
20
15
dB
dB
Attenuation Accuracy:
(Referenced to Insertion Loss)
All 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
Input Power for 0.1 dB Compression
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
0.1 - 5.5 GHz
50
45
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
DC -5.5 GHz
95
100
ns
ns
Typical Applications
Features
General Discription
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