Hittite HMC271LP4 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz Datasheet

HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
ATTENUATORS - DIGITAL - SMT
5
Typical Applications
Features
The HMC271LP4 / HMC271LP4E is ideal for:
1 dB LSB Steps to 31 dB
• Cellular/3G Infrastructure
CMOS Compatible Serial Data Interface
• Fixed Wireless, WiMax & WiBro
SPI Compatible Serial Output
• Test Instrumentation
±0.4 dB Typical Bit Error
24 Lead 4x4mm QFN Package: 16mm2
Included in the HMC-DK004 Designer’s Kit
Functional Diagram
General Description
The HMC271LP4 & HMC271LP4E are broadband
5-bit positive control GaAs IC digital attenuators with
CMOS compatible 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.
Electrical Specifi cations, TA = +25° C, Vcc = +3V to +5V
Parameter
Typical
Max.
Units
Insertion Loss
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.7 GHz
Frequency
1.9
2.3
2.6
2.8
2.4
2.8
3.1
3.3
dB
dB
dB
dB
Attenuation Range
0.7 - 3.7 GHz
31
dB
Return Loss (RF1 & RF2, All Atten. States)
0.7 - 1.4 GHz
1.4 - 2.7 GHz
2.7 - 3.7 GHz
12
15
16
dB
dB
dB
0.7 - 0.9 GHz
0.9 - 2.2 GHz
2.2 - 3.7 GHz
± (0.4 + 5% of Atten. Setting) Max
± (0.4 + 4% of Atten. Setting) Max
± (0.4 + 5% of Atten. Setting) Max
dB
dB
dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
Min.
Input Power for 0.1 dB Compression
Vcc = 5V
Vcc = 3V
0.7 - 3.7 GHz
24
22
dBm
dBm
Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)
Vcc = 5V
Vcc = 3V
0.7 - 3.7 GHz
48
46
dBm
dBm
0.7 - 3.7 GHz
750
830
ns
ns
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (Latch Enable to 10/90% RF)
5 - 20
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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
Return Loss RF1, RF2
Insertion Loss
(Only Major States are Shown)
-5
RETURN LOSS (dB)
INSERTION LOSS (dB)
+25C
+85C
-40C
-1
-1.5
-2
-2.5
16 dB
31 dB
-20
2 dB
-25
-3.5
1 dB
I.L.
-30
1
1.5
2
2.5
3
3.5
0.5
4
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
FREQUENCY (GHz)
Bit Error
vs. Attenuation State
Normalized Attenuation
(Only Major States are Shown)
0
2
-5
1.5
0.9 GHz
-10
BIT ERROR (dB)
NORMALIZED ATTENUATION (dB)
8 dB
-15
-3
-4
0.5
4 dB
-10
-15
-20
1.9 GHz
2.4 GHz
1
0.5
ATTENUATORS - DIGITAL - SMT
0
0
-0.5
0
-25
-0.5
-30
3.5 GHz
-35
0.5
-1
1
1.5
2
2.5
3
3.5
0
4
4
8
12
16
20
24
28
32
ATTENUATION STATE (dB)
FREQUENCY (GHz)
Bit Error vs. Frequency
Relative Phase vs. Frequency
(Only Major States are Shown)
(Only Major States are Shown)
100
4
RELATIVE PHASE (deg.)
75
BIT ERROR (dB)
3
16 dB
8 dB
1, 2, 4 dB
2
1
31 dB
0
50
31 dB
0
-25
-50
1, 2, 4, 8 dB
-75
-1
0.5
16 dB
25
-100
1
1.5
2
2.5
FREQUENCY (GHz)
3
3.5
4
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
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
5 - 21
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
Worst Case Step Error
Between Successive Attenuation States
Digital Control Voltages
0.8
STEP ERROR (dB)
ATTENUATORS - DIGITAL - SMT
1.2
State
Vcc = +5V
Vcc = +3V
Low
0 to 1.3V
0 to 0.7V
High
3.5 to 5V
2.3 to 3V
0.4
Serial Input Truth Table
0
Latch
Enable
-0.4
-0.8
-1.2
0.5
1
1.5
2
2.5
3
3.5
4
Shift
Clock
Reset
X
X
L
Shift register cleared
X

H
Shift register clocked

X
H
Contents of shift register
transferred to Digital
Attenuator
FREQUENCY (GHz)
Timing
Function
Truth Table
Symbol
Vcc = +5V
Vcc = +3V
Serial Data Input
Units
Parameter
Min.
Max.
Min.
Max.
Serial Input Setup
Time
ts
20
-
100
-
ns
Hold time from Serial
Input to Shift Clock
th
0
-
5
-
ns
Setup time from
Shift Clock to Latch
Enable
tlsup
40
-
100
-
ns
Propagation delay,
Latch Enable to C1
through C16
tpd
Setup time from
Reset to Shift Clock
-
20
-
50
-
ns
fclk
-
30
-
10
MHz
Clock Frequency
(1/tclk)
-
30
-
70
C1
C2
C4
C8
C16
High
High
High
High
High
Reference
I.L.
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
31 dB
Max. Atten.
ns
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Timing Diagram
5 - 22
Attenuation
Setting
RF1 - RF2
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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Logic / Functional Diagram
Programming Example to Select 1 dB Attenuation State
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
5 - 23
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
ATTENUATORS - DIGITAL - SMT
5
5 - 24
Pin Descriptions
Pin Number
Function
Description
1, 3, 4, 6, 10, 12, 13,
15, 16, 18
N/C
These pins should be connected to PCB RF ground to
maximize performance.
2, 17
RF1, RF2
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based on
lowest frequency of operation.
5
Serial Output
Serial data output. Serial input data
delayed by 8 clock cycles.
7
Reset
8
Shift Clock
9
Latch Enable
11
Serial Input
14
Vcc
Supply Voltage.
19 - 24
GND
Package bottom has an exposed metal paddle that must also
be connected to RF/DC Ground.
Interface Schematic
See truth table, control voltage table and timing diagram.
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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Application Circuit
DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer specifi c
frequency to pass with minimal loss. R1 = 5k Ohm is required to supply voltage to the circuit through either PIN 2 or PIN 17.
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
5 - 25
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
ATTENUATORS - DIGITAL - SMT
5
Absolute Maximum Ratings
Digital Inputs (Reset, Shift Clock,
Latch Enable & Serial Input)
-1.5 to (Vcc + 1.5) V
Digital Outputs (Serial Output)
-0.5 to (Vcc + 0.5) V
DC Current on Serial Output
±35 mA
Bias Voltage (Vcc)
+7V
Storage Temperature
-65 to +150 °C
Operating Temperature
-40 to +85 °C
RF Input Power (0.7 - 3.7 GHz)
+26 dBm
ESD Sensitivity (HBM)
Class 1A
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE
SOLDERED TO PCB RF GROUND.
7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
Package Information
Part Number
Package Body Material
Lead Finish
MSL Rating
HMC271LP4
Low Stress Injection Molded Plastic
Sn/Pb Solder
MSL1
HMC271LP4E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
MSL1
Package Marking [3]
[1]
H271
XXXX
[2]
H271
XXXX
[1] Max peak reflow temperature of 235 °C
[2] Max peak reflow temperature of 260 °C
[3] 4-Digit lot number XXXX
5 - 26
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
HMC271LP4 / 271LP4E
v03.0809
1 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz
5
ATTENUATORS - DIGITAL - SMT
Evaluation Circuit Board
List of Materials for Evaluation PCB 108782 [1]
Item
Description
J1 - J2
PCB Mount SMA Connector
J3
2 mm Molex Header
C1, C2
100 pF Capacitor, 0402 Pkg.
C3
0.01 μF Capacitor, 0402 Pkg.
R1
5k Ohm Resistor, 0402 Pkg.
U1
HMC271LP4 / HMC271LP4E
Digital Attenuator
PCB [2]
108780 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
The circuit board used in the final application
should use RF circuit design techniques. Signal
lines should have 50 Ohm impedance while the
package ground leads and exposed ground paddle
should be connected directly to the ground plane
similar to that shown below. A sufficient number
of via holes should be used to connect the top and
bottom ground planes. The evaluation circuit board
as shown is available from Hittite Microwave Corporation upon request.
[2] Circuit Board Material: Rogers 4350
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
5 - 27
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