HMC271LP4
/
271LP4E
v02.0705
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Features
1 dB LSB Steps to 31 dB
CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
+/- 0.4 dB Typical Bit Error
4 x 4 mm QFN Plastic Package
Typical Applications
9
ATTENUATORS - SMT
The HMC271LP4 / HMC271LP4E is ideal for:
鈥?Cellular/3G Infrastructure
鈥?Fixed Wireless & WiMax
鈥?Test Instrumentation
Functional Diagram
General Description
The HMC271LP4 & HMC271LP4E are broadband 5-
bit positive control GaAs IC digital attenuators with
serial-to-parallel drivers in low cost leadless QFN
4x4 mm SMT packages. Covering 0.7 to 3.7 GHz,
the insertion loss is typically less than 2.5 dB. The
attenuator bit values are 1 (LSB), 2, 4, 8, and 16 dB
for a total attenuation of 31 dB. Accuracy is excellent
at 鹵 0.4 dB typical with an IIP3 of up to +48 dBm. Five
bit CMOS compatible 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.
Electrical Specifications,
T
A
= +25擄 C, Vcc = +3V to +5V
Parameter
Frequency
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
0.7 - 3.7 GHz
0.7 - 1.4 GHz
1.4 - 2.7 GHz
2.7 - 3.7 GHz
Min.
Typical
1.9
2.3
2.6
2.8
31
12
15
16
Max.
2.4
2.8
3.1
3.3
Units
dB
dB
dB
dB
dB
dB
dB
dB
Insertion Loss
Attenuation Range
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)
Vcc = 5V
Vcc = 3V
Vcc = 5V
Vcc = 3V
0.7 - 3.7 GHz
0.7 - 3.7 GHz
0.7 - 3.7 GHz
鹵 0.4 鹵 5% of Atten. Setting Max
24
22
48
46
dB
dBm
dBm
dBm
dBm
0.7 - 3.7 GHz
750
830
ns
ns
9 - 14
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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