Page 1
MICROWAVE CORPORATION
GaAs MMIC SMT PRESCALER 3.0 - 6.5 GHz
FEBRUARY 2000
HMC251MS8
6
Features
DIVIDE-BY-TWO
LOW PHASE NOISE: -130 dBc/Hz @ 10KHz
SINGLE POSITIVE BIAS VOLTAGE: +5.0V @ 27 mA
MINIATURE SMALL OUTLINE PACKAGE : MSOP8
General Description
The HMC251MS8 is a low noise divideby-2 GaAs MMIC prescaler in an 8 lead
surface mount MSOP plastic package.
This device operates from 3.0 to 6.5 GHz
(input frequency) with a single +5.0 V DC
supply while drawing only 27 mA of current. The low residual phase noise of this
prescaler helps the user maintain good
system noise performance. The
HMC251MS8 is ideal for WLL, UNII, ISM
and VSAT applications. This is the smallest divide-by-2 prescaler available.
Guaranteed Performance, V
PRESCALERS
Parameter Condition Min Typical Max Units
Input Frequency Range 3.0 - 6.5 GHz
SMT
Output Frequency Range 1.5 - 3.25 GHz
Operating Input Power Range fin = 3.0 - 4.0 GHz
fin = 4.0 - 5.0 GHz
fin = 5.0 - 6.0 GHz
fin = 6.0 - 6.5 GHz
Output Power for minimum Input
Powe r l ev el
Note 1
Single-Side-Band Phase Noise fin = 5.0 - 6.0 GHz
Supply Voltage (Vdd) 4.75 5.0 5.25 Vdc
Supply Current (Idd) Vdd = +5.0 Vdc 27 33 mA
Note 1: Output Power measured at half the Input Frequency.
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
fin = 3.0 - 4.0 GHz
fin = 4.0 - 5.0 GHz
fin = 5.0 - 6.0 GHz
fin = 6.0 - 6.5 GHz
Offset from carrier= 10KHz
= +5.0 V, 50 Ohm System, -40 to +85 deg C
dd
10
10
10
7
-3
-3
-3
-3
-2
-8
-3
-12
-14
-16
-17
6
-8.0
-7.7
-8.2
-8.5
-130 dBc/Hz
6 - 2
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
Page 2
MICROWAVE CORPORATION
HMC251MS8 SMT PRESCALER 3.0 - 6.5 GHz
HMC251MS8
FEBRUARY 2000
Output Power Versus Frequency @
Minimum Input Power Level
0
-2
-4
-6
-8
-10
OUTPUT POWER (dBm)
-12
-14
3 3.5 4 4.5 5 5.5 6 6.5
+85 C
INPUT FREQUENCY (GHz)
-40 C
+25 C
Output Power for Input Power = +10 dBm
Note: Output Power Measured @ fin/2
0
-2
-4
-6
-8
-10
OUTPUT POWER (dBm)
-12
-14
3 3.5 4 4.5 5 5.5 6 6.5
INPUT FREQUENCY (GHz)
Minimum Input Power Versus
Input Frequency
20
10
Guaranteed
0
-10
-40 C
-20
MINIMUM INPUT POWER (dBm)
-30
3 3.5 4 4.5 5 5.5 6 6.5
INPUT FREQUENCY (GHz)
+25 C
Operating
Window
+85 C
Single-Side-Band Phase Noise Versus
Offset from Carrier, fin= 5 to 6 GHz
-80
-90
-100
-110
-120
-130
-140
SSB PHASE NOISE (dBc/Hz)
-150
-160
1
10
2
10
OFFSET FROM CARRIER (Hz)
3
10
4
10
5
10
6
PRESCALERS
SMT
6
10
S - Parameter data is available On-Line at www.hittite.com
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
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Page 3
MICROWAVE CORPORATION
HMC251MS8 SMT PRESCALER 3.0 - 6.5 GHz
FEBRUARY 2000
HMC251MS8
Output Power Versus Input Power
Input Frequency = 5.2 GHz
-10
-12
-14
-16
OUTPUT POWER (dBm)
-18
-20
6
RF IN S-Parameters RF OUT S-Parameters
PRESCALERS
SMT
0
-2
-4
-6
-8
-10 -5 0 5 10 15 20
Output Power @ 2.6 GHz
Feedthru Signal @ 5.2 GHz
INPUT POWER (dBm)
j1
j0.5
3.0 GHz
j0.2
j2
j5
Output Power Versus Input Power
Input Frequency = 5.8 GHz
0
-2
-4
-6
-8
-10
-12
-14
-16
OUTPUT POWER (dBm)
-18
-20
-10 -5 0 5 10 15 20
j0.5
j0.2
Output Power @ 2.9 GHz
Feedthru Signal @ 5.8 GHz
INPUT POWER (dBm)
j1
j2
3.25 GHz
j5
0.2 0.5 1 2
0
-j0.2
-j0.5
6.5 GHz
5
-j5
-j2
-j1
1.5 GHz
0.2 0.5 1 2
0
-j0.2
-j0.5
5
-j5
-j2
-j1
S-Parameter Data is Available @ www.hittite.com
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
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Page 4
MICROWAVE CORPORATION
HMC251MS8 SMT PRESCALER 3.0 - 6.5 GHz
HMC251MS8
FEBRUARY 2000
Functional Diagram
Vdd
(PIN 1)
RF IN
(PIN 3)
GND
(PINs 2, 4, 5, 7, 8)
OPERATING NOTES:
1. With no input signal, or input signals below the minimum input
power level, the prescalar will self-oscillate.
2. DC blocks on the RF ports are not required but are recommended
if DC voltages exceeding 8 volts are present.
fin / 2
RF OUT
(PIN 6)
Outline Drawing
0.116/0.120
4
(2.95/3.05)
HMC
0.116/0.120
(2.95/3.05)
0.188/0.196
(4.78/4.98)
5
251
Absolute Maximum Ratings
Vdd +8 Vdc
Maxi mum Inp u t Pow er
(Vdd = +5.0Vdc)
Storage Temperature -65 to +150 deg. C
Operating Temperature -40 to +85 deg. C
1. MATERIAL:
A) PACKAGE BODY - LOW STRESS INJECTION - MOLDED PLASTIC,
SILICA & SILICONE IMPREGNATED.
B) LEADFRAME MATERIAL: COPPER ALLOY
2. PLATING: LEAD - TIN SOLDER PLATE
3. DIMENSIONS ARE IN INCHES (MILLIMETERS), UNLESS OTHERWISE
SPECIFIED TOL. ARE ±0.005(±0.13)
4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE
5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE
20 dBm
6
PRESCALERS
PIN 1
0.032/0.036
(0.81/0.91)
0.005/0.007
0.038/0.042
(0.96/1.07)
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
0.0256 TYP
(0.65)
0.012 TYP
(0.30)
0-5
o
0.021 MIN TYP
(0.53)
(0.13/0.18)
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SMT
Page 5
MICROWAVE CORPORATION
HMC251MS8 SMT PRESCALER 3.0 - 6.5 GHz
FEBRUARY 2000
Eval Board Layout (Top View)
HMC251MS8
6
The circuit board used in the final application should be generated with proper RF circuit design techniques.
PRESCALERS
Signal lines at RF IN and RF OUT should have 50 ohm impedance and the package ground leads should be
connected directly to the ground plane similar to that shown above. The evaluation circuit board shown above
is available from Hittite Microwave Corporation upon request.
SMT
List of Material
Item Description
J1, J2 DC Pi n
J3, J4 PC Mount SMA Connector
C1, C2 330 pF Capacitor, 0603 Pkg.
U1 HMC251MS8 Prescaler
PCB
*
102285 Eval Boa rd, LM 102286
* Circuit Board Material : 4350
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
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