MAXIM MAX2648EBT

19-1894; Rev 0; 1/01
UAL
IT MAN
TION K
A
ET
U
E
L
H
A
S
EV
TA
WS DA
FOLLO
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
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
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.
Ordering Information
PART
MAX2648EBT
TEMP. RANGE
PIN-PACKAGE
-40°C to +85°C
2✕3 UCSP
Pin Configuration
Applications
VCC
B1
GND
B2
RFOUT
B3
BIAS
A1
RFIN
A2
GND
A3
GND
IEEE 802.11a Wireless LAN
ETSI HiperLAN/2
5GHz ISM
Microwave Radios
MAX2648
2x3 UCSP
TOP VIEW
(BUMPS ON BOTTOM OF DIE)
UCSP is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
RF INPUT
C1
100pF
WIDTH = 21 mils
LENGTH = 300 mils**
C8*
A1
RFIN
A2
GND
A3
GND
VCC
B1
C3
1000pF
R2
8.2Ω
C8*
5150MHz TO 5350MHz
1.0pF
0.9pF
5725MHz TO 5825MHz
0.7pF
0.8pF
*THESE ARE ATC 500-SERIES, LOW-LOSS
PORCELAIN 0603 CAPACITORS.
**REFER TO MAX2648 EV KIT DATA SHEET FOR
MORE LAYOUT INFORMATION.
MAX2648
C2
100pF
C7*
OPERATING BAND
GND
B2
RFOUT
B3 WIDTH = 21 mils
LENGTH = 300 mils**
C6
100pF
RF
OUTPUT
C7*
L1
22nH
VCC
C4
0.01µF
________________________________________________________________ Maxim Integrated Products
1
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.
MAX2648
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.
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
ABSOLUTE MAXIMUM RATINGS
VCC 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
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.
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 VCC. Typical values for VCC = +3.0V, TA = +25°C, unless otherwise noted.)
PARAMETER
Supply Voltage Range
Supply Current
SYMBOL
CONDITIONS
VCC
ICC
MIN
TYP
2.7
TA = +25°C
12.3
TA = -40°C to +85°C (Note 1)
MAX
UNITS
3.6
V
15
18
mA
Note 1: Limits are guaranteed by design and characterization, and are not production tested.
AC ELECTRICAL CHARACTERISTICS
(MAX2648 evaluation kit, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50Ω system, TA = +25°C. Typical values for VCC = +3.0V,
TA = +25°C, unless otherwise noted. All limits are guaranteed by design and characterization and are not production tested.)
PARAMETER
Frequency Range
Power Gain
SYMBOL
(Note 2)
|S21|
(Note 3)
Maximum Gain Variation over
Temperature
Input Third Order Intercept
Noise Figure
CONDITIONS
fIN
MIN
16
TA = -40°C to +85°C
IIP3
Two tones at 5250MHz and 5251MHz,
-30dBm per tone (Note 4)
NF
(Note 4)
TYP
UNITS
MHz
17.4
dB
0.2
-4.0
MAX
5250
1.0
0
1.8
dB
dBm
2.3
dB
Input Return Loss
|S11|
-14
dB
Output Return Loss
|S22|
-14
dB
Reverse Isolation
|S12|
-31
dB
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)
2
_______________________________________________________________________________________
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
GAIN vs. TEMPERATURE
18.0
17.6
17.4
8
TA = +25°C
GAIN (dB)
17.6
12
17.4
17.2
17.2
17.0
17.0
16.8
16.8
16.6
2
16.6
16.4
0
16.4
6
TA = -40°C
16.2
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
IIP3 vs. TEMPERATURE
IIP3 vs. SUPPLY VOLTAGE
6.4
6.2
6.0
5.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
5.6
-0.8
5.4
-1.0
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
|S11|, |S12|, AND |S22| vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
19
-15
16
|S21| (dB)
17
-20
15
14
|S11|
|S12|
-30
13
-35
12
-40
5200
5400
5600
5800
OPERATING FREQUENCY (MHz)
-1.0
6000
3.0
2.5
2.0
1.5
1.0
0.5
11
5000
0
-0.5
NOISE FIGURE vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
NOISE FIGURE (dB)
18
-10
-25
0.5
-2.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
MAX2648 toc08
|S22|
1.0
|S21| vs. FREQUENCY
(5250MHz APPLICATION CIRCUIT)
MAX2648 toc07
0
1.5
-1.5
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
-5
MAX2648 toc06
MAX2648 toc05
0.8
2.0
MAX2648 toc09
6.6
INPUT 3rd-ORDER INTERCEPT (dBm)
MAX2648 toc04
6.8
1.0
INPUT 3rd-ORDER INTERCEPT (dBm)
P(1dB) vs. SUPPLY VOLTAGE
7.0
OUTPUT 1dB DOWN POINT (dBm)
17.8
17.8
4
MAGNITUDE (dB)
18.0
14
10
MAX2648 toc03
18.2
GAIN (dB)
SUPPLY CURRENT (mA)
16
GAIN vs. SUPPLY VOLTAGE
18.2
MAX2648 toc02
TA = +85°C
18
18.4
MAX2648 toc01
20
0
5000
5200
5400
5600
5800
OPERATING FREQUENCY (MHz)
6000
5150 5175 5200 5225 5250 5275 5300 5325 5350
OPERATING FREQUENCY (MHz)
_______________________________________________________________________________________
3
MAX2648
Typical Operating Characteristics
(MAX2648 evaluation kit tuned for 5150MHz to 5350MHz, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50Ω system, TA = +25°C,
unless otherwise noted.)
Typical Operating Characteristics (continued)
(MAX2648 evaluation kit tuned for 5150MHz to 5350MHz, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50Ω system, TA = +25°C,
unless otherwise noted.)
0
MAX2648 toc10
3.0
2.5
-5
|S11|
MAX2648 toc11
|S11|, |S12|, AND |S22| vs. FREQUENCY
(5800MHz APPLICATION CIRCUIT)
NOISE FIGURE vs. TEMPERATURE
(5250MHz APPLICATION CIRCUIT)
MAGNITUDE (dB)
NOISE FIGURE (dB)
-10
2.0
1.5
1.0
-15
|S22|
-20
-25
|S12|
-30
0.5
-35
0
-40
5000
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
5200
|S21| vs. FREQUENCY
(5800MHz APPLICATION CIRCUIT)
5800
6000
3.0
2.5
NOISE FIGURE (dB)
16
15
14
13
MAX2648 toc13
17
5600
NOISE FIGURE vs. FREQUENCY
(5800MHz APPLICATION CIRCUIT)
MAX2648 toc12
18
5400
OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
|S21| (dB)
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
2.0
1.5
1.0
12
0.5
11
10
5000
5200
5400
5600
5800
OPERATING FREQUENCY (MHz)
6000
0
5725
5750
5775
5800
5825
OPERATING FREQUENCY (MHz)
Pin Description
PIN
4
NAME
A1
RFIN
A2, A3, B2
GND
B3
RFOUT
B1
VCC
FUNCTION
Amplifier Input. AC-couple to this pin with a DC-blocking capacitor. External matching network is
required for optimum performance.
Ground. Provide a low-inductance connection to the ground plane.
Amplifier Output. Provide DC bias to VCC through an RF choke or a quarter-wave transmission line
(see evaluation kit layout). External matching network is required for optimum performance.
Power-Supply Input. Bypass directly to ground plane at this bump. Additional bypassing may be
necessary for long VCC lines.
_______________________________________________________________________________________
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
The MAX2648 low-noise amplifier offers high gain, high
linearity, and low-noise performance from 5GHz to
6GHz. This LNA also functions as a PA predriver or an
LO buffer. The device has been fully characterized and
tested in the 5.2GHz and 5.8GHz bands.
Applications Information
Optimal gain and noise figure performance requires
input and output matching circuits tuned for the band
of interest. All electrical specifications and typical operating characteristics are measured on the MAX2648
evaluation kit (EV kit), which is tuned for operation in
the 5.2GHz band. Referencing the application circuit,
PC board layout, and components specified in the
MAX2648 EV kit data sheet will reduce evaluation and
design time for 5.2GHz ISM-band system designs. For
applications in other bands, refer to the MAX2648 [S]parameters (Table 1), noise parameters (Table 2), and
comments below to aid design.
Input Matching
The input stage is internally biased, so no external bias
circuitry is required at RFIN. Be sure to AC-couple to
the input.
Since the noise figure of the LNA design is severely
degraded by low-Q matching components, always
design with high-Q wire-wound inductors and low-loss
capacitors. Remember that package parasitics must be
taken into consideration; always use components with
self-resonant frequencies higher than the intended frequency of operation.
Output Matching
The output of the MAX2648 is an open-collector transistor; the DC bias and RF matching network are off-chip
as illustrated in the Typical Application Circuit. Bias the
output stage with VCC through an RF choke, leaving as
little pad exposed as possible—any exposed pad here
will act like a small tuning stub and contribute a small,
low-Q, shunt capacitor to the matching network.
If area allows, a better way to supply a bias for narrowband operation is to design in a quarter-wave transmission line. The far side of this high-Z0 transmission line is
AC-shorted to ground with a radial stub; low-frequency
decoupling is handled by a 1000pF shunt capacitor to
ground nearby. Bias this point through an RF choke,
and decouple the supply with a few µF at the VCC connection.
Power-Supply Bypassing
Proper power-supply bypassing is essential for highfrequency circuit stability. Place a small value capacitor
as close to the IC as possible to decouple high-frequency noise. Place a larger value capacitor near the
supply to decouple low-frequency noise. Whenever
possible, place the ground-connected side of bypass
capacitors within a few millimeters of the IC’s ground
connections.
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, EMI, and stray inductance. Use multiple separate low-inductance-plated
vias to the ground plane for each ground bump.
The chip-scale package (UCSP) has a bump pitch of
0.5mm (19.7mil) and a bump diameter of 0.3mm
(12mil). Therefore, lay out the solder pad spacing on
0.5mm (19.7mil) centers, and use a pad size of
0.25mm (10mil) and a solder mask opening of 0.33mm
(13mil). Round or square pads are permissible. Refer to
the Maxim application note, Wafer Level Ultra-ChipScale Packaging, for additional detailed information on
UCSP layout and handling.
Chip Information
TRANSISTOR COUNT: 85
_______________________________________________________________________________________
5
MAX2648
Detailed Description
MAX2648
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
Table 1. MAX2648 Typical Device [S] Parameters
(TA = +25°C, VCC = +3.0V, ZS = ZL = 50Ω, input and output matching network not included).
6
S11
S21
S12
S22
FREQUENCY
(MHZ)
|S11|
∠ S11
dB
|S21|
∠ S21
|S12|
∠ S12
|S22|
∠ S22
100
0.830
-12.7
27.1
22.89
171.3
0.004
72.6
0.984
-6.3
-27.0
500
0.797
-63.4
25.5
18.88
138.8
0.016
46.6
0.837
1000
0.774
-101.4
23.0
14.21
113.6
0.023
28.5
0.706
-40.7
1500
0.774
-126.2
20.6
10.76
94.2
0.025
14.3
0.636
-50.9
2000
0.774
-142.5
18.5
8.483
79.9
0.026
0.2
0.599
-59.5
2500
0.779
-153.2
16.7
6.893
67.6
0.023
-5.9
0.578
-69.9
3000
0.788
-162.4
14.9
5.573
57.8
0.025
-7.8
0.528
-78.8
-83.0
3500
0.794
-170.0
13.7
4.859
49.8
0.023
-11.8
0.516
4000
0.798
-176.3
12.6
4.306
40.7
0.024
-16.5
0.535
-88.0
4500
0.800
178.0
11.6
3.810
32.0
0.024
-27.5
0.553
-95.1
4600
0.803
176.6
11.4
3.733
30.2
0.019
-32.5
0.564
-96.5
-97.8
4700
0.809
175.5
11.1
3.616
27.6
0.018
-29.4
0.565
4800
0.802
174.8
11.0
3.550
26.0
0.022
-39.1
0.575
-99.1
4900
0.803
173.7
10.8
3.481
24.5
0.018
-30.3
0.571
-100.1
5000
0.803
172.9
10.6
3.426
22.4
0.019
-35.8
0.580
-102.4
5100
0.806
172.1
10.5
3.361
21.1
0.018
-34.5
0.587
-103.2
5200
0.801
171.0
10.4
3.324
19.8
0.022
-35.9
0.591
-104.9
-106.6
5300
0.803
170.6
10.1
3.223
17.1
0.017
-42.7
0.603
5400
0.804
169.7
10.0
3.174
15.5
0.017
-29.1
0.600
-107.4
5500
0.809
168.4
9.81
3.094
14.1
0.012
-40.4
0.604
-109.4
5600
0.807
167.7
9.69
3.054
12.2
0.014
-34.7
0.612
-110.8
5700
0.813
167.0
9.46
2.974
10.6
0.014
-44.2
0.622
-112.2
5800
0.818
165.9
9.35
2.937
9.1
0.013
-46.2
0.621
-113.6
5900
0.817
165.7
9.11
2.854
6.5
0.011
-46.4
0.630
-115.6
6000
0.813
164.6
8.97
2.811
5.4
0.010
-44.1
0.637
-117.1
_______________________________________________________________________________________
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
MAX2648
Table 2. MAX2648 Typical Noise Parameters
(TA = +25°C, VCC = +3.0V, data from design simulation.)
FREQUENCY (MHZ)
FMIN (dB)
|ΓOPT|
∠ ΓOPT
RN (Ω)
5000
1.502
0.683
151.8
50.7
5100
1.528
0.687
159.0
52.2
5200
1.554
0.690
159.8
53.7
5300
1.581
0.692
160.6
55.2
56.8
5400
1.613
0.694
161.4
5500
1.647
0.696
162.2
58.5
5600
1.662
0.700
163.0
59.7
5700
1.672
0.702
163.8
60.8
5800
1.695
0.705
164.6
62.3
5900
1.722
0.707
165.3
63.8
6000
1.750
0.708
166.1
65.3
_______________________________________________________________________________________
7
5GHz to 6GHz Low-Noise Amplifier
in 6-Pin UCSP
6L,UCSP.EPS
MAX2648
Package Information
8
_______________________________________________________________________________________