Rainbow Electronics MAX2648 User Manual
General Description
The MAX2648 high-linearity, silicon-germanium (SiGe)
low-noise amplifier (LNA) is designed for 5GHz wireless
LAN systems based on IEEE 802.11a and HiperLAN2
standards. The LNA provides high gain, low noise, and
high linearity performance, allowing it to be used as a
first-stage LNA, an LO buffer, or a transmitter driver
amplifier. This highly versatile amplifier provides 17dB
gain, 1.8dB noise figure, and 0dBm input third-order
intercept point (IIP3) while consuming only 12mA.
The MAX2648 is designed on a low-noise, advanced
SiGe process optimized for high-frequency applications. It operates over a +2.7V to +3.6V supply range.
The device is packaged in a tiny 2✕3 chipscale package (UCSP™) with six solder bumps, measuring 1.0mm
✕
1.5mm.
Applications
IEEE 802.11a Wireless LAN
ETSI HiperLAN/2
5GHz ISM
Microwave Radios
Features
♦ 5GHz to 6GHz Wideband Operation
♦ Low Noise Figure: 1.8dB at 5.25GHz
♦ High Gain: 17dB
♦ High IIP3: 0dBm
♦ +2.7V to +3.6V Single-Supply Operation
♦ Chip-Scale Package (UCSP) Measuring
1.0mm
✕
1.5mm
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
Ordering Information
19-1894; Rev 0; 1/01
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Typical Application Circuit
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX2648EBT -40°C to +85°C2
PART TEMP. RANGE PIN-PACKAGE
✕3 UCSP
V
CC
GND
B2 GND
BIAS
MAX2648
2x3 UCSP
TOP VIEW
(BUMPS ON BOTTOM OF DIE)
A1B1 RFIN
A2
GNDRFOUT
A3B3
C1
100pF
RF INPUT
R2
8.2Ω
C8*
C2
100pF
C3
1000pF
WIDTH = 21 mils
LENGTH = 300 mils**
A1 A2
RFIN GND GND
V
CC
B1
C4
0.01µF
MAX2648
GND RFOUT
B2
A3
WIDTH = 21 mils
B3
LENGTH = 300 mils**
L1
22nH
C7*
1.0pF
0.7pF
RF
OUTPUT
C8*
0.9pF
0.8pF
V
CC
OPERATING BAND
5150MHz TO 5350MHz
5725MHz TO 5825MHz
*THESE ARE ATC 500-SERIES, LOW-LOSS
PORCELAIN 0603 CAPACITORS.
**REFER TO MAX2648 EV KIT DATA SHEET FOR
MORE LAYOUT INFORMATION.
C6
100pF
C7*
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +3.6V, no RF signals applied, RFIN and RFOUT terminated in 50Ω through a DC-blocking capacitor, RFOUT connected to V
CC
. Typical values for VCC= +3.0V, TA= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Limits are guaranteed by design and characterization, and are not production tested.
V
CC
to GND...........................................................-0.3V to +6.0V
RFOUT to GND......................................................-0.3V to +6.0V
RFIN.......................................................................-0.3V to +0.8V
RFIN Power (50Ω source) ..............................................+15dBm
Continuous Power Dissipation
2
✕
3-Bump UCSP (derate 24mW/°C above +70°C) ......500mW
Operating Temperature .......................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-55°C to +150°C
AC ELECTRICAL CHARACTERISTICS
(MAX2648 evaluation kit, VCC= +3.0V, f
IN
= 5250MHz, PIN= -30dBm, 50Ω system, TA= +25°C. Typical values for V
CC
= +3.0V,
T
A
= +25°C, unless otherwise noted. All limits are guaranteed by design and characterization and are not production tested.)
Note 2: The recommended operating range is 5100MHz to 5850MHz. Operation outside this frequency range is possible but has not
been characterized. The device is matched, characterized, and tested at 5250MHz. For optimum performance at a given
frequency, the input and output ports must be properly matched. See Applications Information section for more information
on matching.
Note 3: Specifications are corrected for board losses (0.4dB at input, 0.4dB at output)
Note 4: Specification is corrected for board losses (0.4dB at input)
Supply Voltage Range V
Supply Current I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
TA = +25°C 12.3 15
TA = -40°C to +85°C (Note 1) 18
2.7 3.6 V
mA
Frequency Range f
Power Gain |S21| (Note 3) 16 17.4 dB
Maximum Gain Variation over
Temperature
Input Third Order Intercept IIP3
Noise Figure NF (Note 4) 1.8 2.3 dB
Input Return Loss |S11| -14 dB
Output Return Loss |S22| -14 dB
Reverse Isolation |S12| -31 dB
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
(Note 2) 5250 MHz
IN
T
= -40°C to +85°C 0.2 1.0 dB
A
Two tones at 5250MHz and 5251MHz,
-30dBm per tone (Note 4)
-4.0 0 dBm
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
_______________________________________________________________________________________ 3
Typical Operating Characteristics
(MAX2648 evaluation kit tuned for 5150MHz to 5350MHz, VCC= +3.0V, fIN= 5250MHz, P
IN
= -30dBm, 50Ω system, TA= +25°C,
unless otherwise noted.)
20
18
16
14
12
10
8
6
SUPPLY CURRENT (mA)
4
2
0
2.7 2.9 3.0 3.12.8 3.2 3.3 3.4 3.5 3.6
7.0
6.8
6.6
6.4
6.2
6.0
5.8
OUTPUT 1dB DOWN POINT (dBm)
5.6
5.4
2.7 2.92.8 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TA = +85°C
TA = +25°C
TA = -40°C
SUPPLY VOLTAGE (V)
P(1dB) vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
18.4
18.2
MAX2648 toc01
18.0
17.8
17.6
17.4
GAIN (dB)
17.2
17.0
16.8
16.6
16.4
-40 -20 -10-30 0 102030405060708090
1.0
0.8
MAX2648 toc04
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
INPUT 3rd-ORDER INTERCEPT (dBm)
-0.8
-1.0
2.7 2.92.8 3.0 3.1 3.2 3.3 3.4 3.5 3.6
GAIN vs. TEMPERATURE
MAX2648 toc02
TEMPERATURE (°C)
IIP3 vs. SUPPLY VOLTAGE
MAX2648 toc05
SUPPLY VOLTAGE (V)
GAIN vs. SUPPLY VOLTAGE
18.2
18.0
17.8
17.6
17.4
17.2
GAIN (dB)
17.0
16.8
16.6
16.4
16.2
2.7 2.92.8 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
IIP3 vs. TEMPERATURE
2.0
1.5
1.0
0.5
0
-0.5
-1.0
INPUT 3rd-ORDER INTERCEPT (dBm)
-1.5
-2.0
-40 -20 -10-30 01020304050607080
TEMPERATURE (
°C)
MAX2648 toc03
MAX2648 toc06
90
|S11|, |S12|, AND |S22| vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
0
-5
-10
-15
-20
-25
MAGNITUDE (dB)
-30
-35
-40
5000 5200 5400 5600 5800 6000
|S22|
|S11|
OPERATING FREQUENCY (MHz)
|S12|
MAX2648 toc07
|S21| vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
19
18
17
16
| (dB)
15
21
|S
14
13
12
11
5000 5200 5400 5600 5800 6000
OPERATING FREQUENCY (MHz)
MAX2648 toc08
NOISE FIGURE (dB)
NOISE FIGURE vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
3.0
2.5
2.0
1.5
1.0
0.5
0
5150 52005175 5225 5250 5275 5300 5325 5350
OPERATING FREQUENCY (MHz)
MAX2648 toc09
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