HMC305LP4
/
305LP4E
v03.0809
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
• Cellular/3G Infrastructure
The HMC305LP4 / HMC305LP4E is ideal for:
• Fixed Wireless, WiMax & WiBro
• Test Instrumentation
Functional Diagram
D
E
U
IN
T
N
O
T
C
C
S
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D
D
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R
P
Features
0.5 dB LSB Steps to 15.5 dB
CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
±0.3 dB Typical Bit Error
2
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
s
ign
24 Lead 4x4mm QFN Package:
s
De
16mm
Included in the HMC-DK004 Designer’s Kit
New
for
ded
Description
General
men
m
The HMC305LP4 & HMC305LP4E are broadband
eco
tR
5-bit positive control GaAs IC digital attenuators with
No
CMOS compatible serial-to-parallel drivers packaged
in leadless QFN 4x4 mm SMT packages. Covering
0.7 to 3.8 GHz, the insertion loss is typically less
than 1.5 to 2 dB. The attenuator bit values are 0.5
(LSB), 1, 2, 4, and 8 dB for a total attenuation of
15.5 dB. Attenuation accuracy is excellent at ±0.25
dB typical with an IIP3 of up to +52 dBm. Five bit
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,
T
A
= +25° C, Vcc = +3V to +5V
Parameter
Frequency
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
0.7 - 3.8 GHz
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
0.7 - 0.9 GHz
0.9 - 2.2 GHz
2.2 - 3.8 GHz
Vcc = 5V
Vcc = 3V
Vcc = 5V
Vcc = 3V
0.7 - 3.8 GHz
0.7 - 3.8 GHz
Min.
Typical
1.2
1.5
1.8
2.0
15.5
17
18
19
15
± (0.5 +5% of Atten. Setting) Max
± (0.3 +4% of Atten. Setting) Max
± (0.5 +5% of Atten. Setting) Max
25
23
52
48
750
830
Max.
1.5
2.0
2.3
2.5
Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
ns
ns
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)
0.7 - 3.8 GHz
5-2
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
HMC305LP4 / 305LP4E
v03.0809
Insertion Loss
0
-0.5
INSERTION LOSS (dB)
-1
-1.5
-2
-2.5
-3
-3.5
-4
0.5
-5
-10
-15
-20
-25
0.5 dB
2 dB
+25C
+85C
-40C
1
1.5
2
2.5
FREQUENCY (GHz)
New
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com
t Re
No
1 dB
3
3.5
4
-30
0.5
1
1.5
s
ign
Des
8 dB
I.L.
2.5
3
15.5 dB
4 dB
2
3.5
4
FREQUENCY (GHz)
Normalized Attenuation
(Only Major States are Shown)
0
NORMALIZED ATTENUATION (dB)
-2
Bit Error
vs. Attenuation State
1
0.75
-4
3.5 GHz
1.9 GHz
0.9 GHz
BIT ERROR (dB)
-6
-8
-10
-12
-14
-16
0.5
0.5
0.25
0
-0.25
2.4 GHz
1
1.5
2
2.5
3
3.5
4
-0.5
0
2
4
6
8
10
12
14
1
FREQUENCY (GHz)
Bit Error vs. Frequency
(Only Major States are Shown)
3
Relative Phase vs. Frequency
(Only Major States are Shown)
60
40
20
0
-20
-40
0.5, 1, 2, 4, 8 dB
15.5 dB
2
BIT ERROR (dB)
8 dB
1
15.5 dB
0
0.5, 1, 2, 4 dB
-1
0.5
RELATIVE PHASE (deg.)
-60
1
1.5
2
2.5
3
3.5
4
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
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
5-3
ATTENUATORS - DIGITAL - SMT
D
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T
N
O
T
C
C
S
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D
D
O
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P
Return Loss RF1, RF2
0
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
(Only Major States are Shown)
5
RETURN LOSS (dB)
HMC305LP4 / 305LP4E
v03.0809
5
ATTENUATORS - DIGITAL - SMT
Worst Case Step Error
Between Successive Attenuation States
1.2
0.8
STEP ERROR (dB)
0.4
0
-0.4
-0.8
-1.2
0.5
1
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C
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Digital Control Voltages
State
Low
Vcc = +5V
0 to 1.3V
3.5 to 5V
High
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Vcc = +3V
0 to 0.7V
2.3 to 3V
Serial Input Truth Table
Latch
Enable
X
X
Shift
Clock
X
Reset
L
1.5
2
2.5
FREQUENCY (GHz)
Timing
Symbol
Parameter
Min.
Serial Input Setup
Time
Hold time from Serial
Input to Shift Clock
Setup time from
Shift Clock to Latch
Enable
Propagation delay,
Latch Enable to C0.5
through C8
Setup time from
Reset to Shift Clock
Clock Frequency
(1/tclk)
ts
th
20
0
New
for
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com
t Re
No
X
H
H
3
3.5
4
s
ign
Des
Function
Shift register cleared
Shift register clocked
Contents of shift register
transferred to Digital
Attenuator
Truth Table
C 0.5
C1
High
High
Low
High
High
High
Low
Vcc = +5V
Max.
-
-
Vcc = +3V
Min.
100
5
Max.
-
-
Units
Serial Control Input
C2
High
High
High
Low
High
High
Low
C4
High
High
High
High
Low
High
Low
C8
High
High
High
High
High
Low
Low
Attenuation
Setting
RF1 - RF2
Reference
I.L.
0.5 dB
1 dB
2 dB
4 dB
8 dB
15.5 dB
Max. Atten.
ns
ns
High
Low
High
tlsup
40
-
100
-
ns
High
High
High
tpd
-
30
-
70
ns
Low
-
fclk
20
-
-
30
50
-
-
10
ns
MHz
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Timing Diagram
5-4
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
HMC305LP4 / 305LP4E
v03.0809
Logic / Functional Diagram
New
for
ded
men
com
t Re
No
s
ign
Des
Programming Example to Select 0.5 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
5-5
ATTENUATORS - DIGITAL - SMT
D
E
U
IN
T
N
O
T
C
C
S
U
I
D
D
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R
P
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
5
HMC305LP4 / 305LP4E
v03.0809
5
ATTENUATORS - DIGITAL - SMT
Pin Descriptions
Pin Number
1, 3, 4, 6, 10, 12, 13,
15, 16, 18
2, 17
D
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IN
T
N
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C
C
S
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D
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Function
N/C
Description
These pins should be connected to PCB RF ground to
maximize performance.
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based
on lowest frequency of operation.
RF1, RF2
Serial Output
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Interface Schematic
5
New
for
ded
men
com
t Re
No
Serial data output. Serial input data
delayed by 8 clock cycles
s
ign
Des
7
8
9
Reset
Shift Clock
Latch Enable
See truth table, control voltage table and timing diagram.
11
Serial Input
14
Vcc
Supply Voltage.
Package bottom has an exposed metal paddle that must also
be connected to RF/DC Ground.
19 - 24
GND
5-6
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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