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SWITCHES - SMT
14
HMC347G8
GaAs MMIC HERMETIC SMT SPDT
SWITCH, DC - 8.0 GHz
v01.0404
General Description
Features
Functional Diagram
The HMC347G8 is a broadband high isolation
non-refl ective GaAs MESFET SPDT switch in a 8
lead glass/metal (hermetic) surface mount pack-
age. Covering DC to 8.0 GHz, the switch features
>42 dB isolation up to 2 GHz and >25 dB isolation
up to 8.0 GHz. The switch operates using com-
plementary negative control voltage logic lines of
-5/0V and requires no bias supply. This SPDT is a
good replacement for the HMC132G7 SPDT.
Isolation: 42 dB @ 2.5 GHz
30 dB @ 6.0 GHz
Insertion Loss: 2.0 dB @ 6.0 GHz
Non-Refl ective Design
8 Lead Hermetic SMT Package
Electrical Specifi cations,
T
A
= +25 C, With 0/-5V Control, 50 Ohm System
Typical Applications
The HMC347G8 is ideal for:
Telecom Infrastructure
Microwave Radio & VSAT
Military Radios, Radar & ECM
Test Instrumentation
Parameter
Frequency
Min.
Typ.
Max.
Units
Insertion Loss
DC - 2.0 GHz
DC - 6.0 GHz
DC - 8.0 GHz
2.0
2.2
2.2
2.3
2.6
2.7
dB
dB
dB
Isolation
DC - 2.0 GHz
DC - 6.0 GHz
DC - 8.0 GHz
41
27
25
45
30
28
dB
dB
dB
Return Loss
"On State"
DC - 2.0 GHz
DC - 8.0 GHz
9
6
12
10
dB
dB
Return Loss RF1, RF2
"Off State"
DC - 2.0 GHz
DC - 8.0 GHz
9
6
dB
dB
Input Power for 1 dB Compression
0.5 - 8.0 GHz
19
23
dBm
Input Third Order Intercept
(Two-Tone Input Power= +7 dBm Each Tone, 1 MHz Tone Separation)
0.5 - 8.0 GHz
38
43
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
DC - 8.0 GHz
3
6
ns
ns
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14
SWITCHES - SMT
-5
-4
-3
-2
-1
0
0
1
2
3
4
5
6
7
8
9
10
+ 25C
+ 85C
- 40C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-70
-60
-50
-40
-30
-20
-10
0
0
1
2
3
4
5
6
7
8
9
10
RF1
RF2
ISOLATION (dB)
FREQUENCY (GHz)
-20
-15
-10
-5
0
0
1
2
3
4
5
6
7
8
9
10
RFC
RF1, RF2 ON
RF1, RF2 OFF
RETURN LOSS (dB)
FREQUENCY (GHz)
10
15
20
25
30
0
2
4
6
8
10
1 dB Compression Point
0.1 dB Compression Point
INPUT P1dB (dBm)
FREQUENCY (GHz)
30
35
40
45
50
0
2
4
6
8
10
+25C
+85C
-40C
INPUT IP3 (dBm)
FREQUENCY (GHz)
GaAs MMIC SUB-HARMONICALLY PUMPED MIXER 17 - 25 GHz
Input Third Order Intercept Point
Return Loss
0.1 and 1 dB Input Compression Point
Insertion Loss
Isolation
HMC347G8
GaAs MMIC HERMETIC SMT SPDT
SWITCH, DC - 8.0 GHz
v01.0404
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Order Online at www.hittite.com
SWITCHES - SMT
14
Truth Table
Control Voltages
Outline Drawing
Control Input
Signal Path State
A
B
RFC to RF1
RFC to RF2
High
Low
On
Off
Low
High
Off
On
State
Bias Condition
Low
0 to -0.2V @ 10 uA Max.
High
-5V @ 10 uA Typ. to -7V @ 40 uA Typ. ( 0.5 Vdc)
HMC347G8
GaAs MMIC HERMETIC SMT SPDT
SWITCH, DC - 8.0 GHz
v01.0404
NOTES:
1. PACKAGE MATERIAL: ALUMINA LOADED BOROSILICATE GLASS.
2. LEAD, BASE, COVER MATERIAL: KOVARTM (#7052 CORNING).
3. PLATING: ELECTROLYTIC GOLD 50 MICROINCHES MIN., OVER
ELECTROLYTIC NICKEL 50 MICROINCHES MIN.
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. TOLERANCES: .005 [0.13] UNLESS OTHERWISE SPECIFIED.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
Caution: Do not "Hot Switch" power levels greater than
+13 dBm (Vctl = 0/-5 Vdc).
Absolute Maximum Ratings
RF Input Power (Vctl = -5V)
+27 dBm
Control Voltage Range (A & B)
+0.5V to -7.5 Vdc
Channel Temperature
150 C
Thermal Resistance
(Insertion Loss Path)
440 C/W
Thermal Resistance
(Terminated Path)
540 C/W
Storage Temperature
-65 to +150 C
Operating Temperature
-55 to +85 C
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14
SWITCHES - SMT
Pin Descriptions
Suggested Driver Circuit
Pin Number
Function
Description
Interface Schematic
1, 4, 7
RFC, RF1, RF2
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if RF line potential is not equal to 0V.
2, 3, 8
GND
Package bottom must also
be connected to PCB RF ground.
5
CTLA
See truth table and control voltage table.
6
CTLB
See truth table and control voltage table.
HMC347G8
GaAs MMIC HERMETIC SMT SPDT
SWITCH, DC - 8.0 GHz
v01.0404
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12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
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SWITCHES - SMT
14
Evaluation PCB
The circuit board used in the fi nal application should be
generated with proper RF circuit design techniques. Signal
lines at the RF port should have 50 ohm impedance and
the package ground leads and package bottom should be
connected directly to the ground plane similar to that shown
above. The evaluation circuit board shown above is avail-
able from Hittite Microwave Corporation upon request.
List of Material
Item
Description
J1 - J3
PC Mount SMA RF Connector
J4 - J6
DC Pin
U1
HMC347G8 SPDT Switch
PCB*
102088-3 Evaluation PCB
* Circuit Board Material: Rogers 4350
HMC347G8
GaAs MMIC HERMETIC SMT SPDT
SWITCH, DC - 8.0 GHz
v01.0404
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