hittite HMC271LP4 User Manual
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HMC271LP4 / 271LP4E
v02.0705
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
9
ATTENUATORS - SMT
Typical Appli cations
The HMC271LP4 / HMC271LP4E is ideal for:
• Cellular/3G Infrastructure
• Fixed Wireless & WiMax
• Test Instrumentation
Functional Diagram
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
General Description
The HMC271LP4 & HMC271LP4E are broadband 5bit 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 ± 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.
9 - 14
Electrical Specifications, T
Parameter Frequency Min. Typical Max. Units
Insertion Loss
Attenuation Range 0.7 - 3.7 GHz 31 dB
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Inser tion Loss)
All Attenuation States 0.7 - 3.7 GHz ± 0.4 ± 5% of Atten. Setting Max dB
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 - 3.7 GHz
0.7 - 1.4 GHz
1.4 - 2.7 GHz
2.7 - 3.7 GHz
Vcc = 5V
Vcc = 3V
Vcc = 5V
Vcc = 3V
0.7 - 3.7 GHz
0.7 - 3.7 GHz
0.7 - 3.7 GHz
1.9
2.3
2.6
2.8
12
15
16
24
22
48
46
750
830
2.4
2.8
3.1
3.3
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
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
ns
ns
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
HMC271LP4 / 271LP4E
v02.0705
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
1 dB LSB GaAs MMIC 5-BIT SERIAL
Return Loss RF1, RF2
(Only Major States are Shown)
0
-5
16 dB 31 dB
-10
-15
-20
RETURN LOSS (dB)
2 dB
-25
-30
0.5 1 1.5 2 2.5 3 3.5 4
8 dB4 dB
1 dB
I.L.
FREQUENCY (GHz)
9
Normalized Attenuation
(Only Major States are Shown)
0
-5
-10
-15
-20
-25
-30
NORMALIZED ATTENUATION (dB)
-35
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
Bit Error vs. Frequency
(Only Major States are Shown)
4
3
2
1
BIT ERROR (dB)
0
-1
16 dB
31 dB
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
Bit Error
vs. Attenuation State
2
1.5
1
0.5
0
BIT ERROR (dB)
-0.5
-1
02468101214161820222426283032
0.9 GHz
ATTENUATION STATE (dB)
1.9 GHz
3.5 GHz
2.4 GHz
ATTENUATORS - SMT
Relative Phase vs. Frequency
(Only Major States are Shown)
100
75
50
1, 2, 4 dB8 dB
25
0
-25
-50
RELATIVE PHASE (deg.)
-75
-100
0 0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
31 dB
16 dB
1, 2, 4, 8 dB
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: 978-250-3343 Fax: 978-250 -3373
Order On-line at www.hittite.com
9 - 15
9
v02.0705
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
Worst Case Step Error
Between Successive Attenuation States
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
STEP ERROR (dB)
-0.6
-0.8
-1
-1.2
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
HMC271LP4 / 271LP4E
1 dB LSB GaAs MMIC 5-BIT SERIAL
CMOS Control Voltages
State Vcc = +5V Vcc = +3V
Low 0 to 1.3V 0 to 0.7V
High 3.5 to 5.0V 2.3 to 3.0V
Serial Input Truth Table
Latch
Enable
X X L Shift register cleared
X
Ç
Shift
Lock
Ç
Reset Function
HShift register locked
XH
Contents of shift register
transferrred to output latches
ATTENUATORS - SMT
Timing
Parameter
Serial IN Setup Time ts 20 - 100 - ns
Hold time from Serial
In to Shift Clock
Setup time from
Shift clock to Latch
Enable
Propogation delay,
Latch enable to Qa
through Qh
Setup time from
Reset to Shift Clock
Clock Frequency
(1/t cl k)
Symbol Vcc = +5V Vcc = +3V Unit
Min. Max. Min. Max.
th 0 - 5 - ns
tlsup 40 - 100 - ns
tpd - 30 - 70 ns
-20-50-ns
fclk - 30 - 10 MHz
Timing Diagram
Truth Table
Serial Data Input Attenuation
C1 C2 C4 C8 C16
High High High High High
Low High High High High 1 dB
High Low High High High 2 dB
High High Low High High 4 dB
High High High Low High 8 dB
High High High High Low 16 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.
31 dB
Max. Atten.
9 - 16
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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