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PDF MAX2338 Data sheet ( Hoja de datos )
| Número de pieza | MAX2338 | |
| Descripción | Triple/Dual-Mode CDMA LNA/Mixers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-1807; Rev 1; 3/01
EVAALVUAAILTAIOBNLEKIT Triple/Dual-Mode CDMA LNA/Mixers
General Description
The MAX2338 receiver RF front-end IC is designed for
dual-band CDMA cellular phones and can also be used
in dual-band TDMA, GSM, or EDGE cellular phones.
Thanks to the MAX2338’s on-chip low-power LO
divider, the cellular VCO module can be eliminated.
The MAX2338 includes a low-noise amplifier (LNA) with
an adjustable high-input third-order intercept point
(IIP3) to minimize intermodulation and cross-modulation
in the presence of large interfering signals. For cellular
band operation, a low-gain LNA is available for higher
cascaded IIP3 at lower current.
The CDMA mixers are designed for high linearity, low
noise, and differential IF outputs. The FM mixer is
designed for lower current and single-ended output.
The MAX2338 triple-mode LNA/mixer includes an on-
chip LO frequency divider to allow the use of a single
VCO for both bands. This device is available in an ultra-
small 28-pin leadless QFN package.
________________________Applications
Dual-Band, Triple-Mode PCS/Cellular Phones
Dual-Mode Cellular Phones
Typical Operating Circuit appears at end of data sheet.
Features
o 1.4dB LNA Noise Figure
o 15dB LNA Gain
o Mixer Noise Figure
7.5dB (CDMA)
8.7dB (AMPS)
o Mixer Gain
14.5dB PCS
13.3dB Cellular
8.8dB AMPS
o LO Frequency Divider, Saves VCO Module
o LO Output Buffers for TX
o Ultra-Small 28-Pin Leadless Package
PART
MAX2338EGI
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QFN
TOP VIEW
Pin Configuration/
Functional Diagram
28 27 26 25 24 23 22
RLNA 1
PLNAIN 2
GND 3
CLNAIN 4
BAND 5
LIN 6
GAIN 7
MAX2338
÷2
21 RBIAS
20 IF+
19 IF-
18 GND
17 BUFFEN
16 VCC
15 FMOUT
8 9 10 11 12 13 14
QFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Triple/Dual-Mode CDMA LNA/Mixers
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
PCS-BAND SUPPLY CURRENT
30
HGHL
25
20 HGLL
15
10
5
0
-50
0 50
TEMPERATURE (°C)
100
CELLULAR-BAND SUPPLY CURRENT
30
HGHL
25
20 LGHL
15 HGLL
FM
10
5
0
-50
0 50
TEMPERATURE (°C)
100
PCS-BAND HGHL LNA GAIN
vs. CURRENT
17
TA = -40°C
16
15
14
TA = +25°C
TA = +85°C
13
12
11
10
4
6 8 10 12 14 16
LNA CURRENT (mA)
CELLULAR-BAND HGHL LNA GAIN
vs. CURRENT
18
TA = -40°C
17
16
15
14
TA = +25°C
TA = +85°C
13
12
4 6 8 10 12 14 16 18 20
LNA CURRENT (mA)
CELLULAR-BAND LNA GAIN
vs. FREQUENCY
20
HGHL
15
HGLL, FM
10
5
0
LGHL
-5
850
860 870 880 890
FREQUENCY (MHz)
900
17
16
15
14
13
12
11
10
9
8
7
1900
PCS-BAND LNA GAIN
vs. FREQUENCY
HGHL
HGLL
1920 1940 1960 1980
FREQUENCY (MHz)
2000
10
9
8
7
6
5
4
3
2
4
PCS-BAND HGHL LNA IIP3
vs. CURRENT
TA = -40°C
TA = +25°C
TA = +85°C
5678
LNA CURRENT (mA)
9
CELLULAR-BAND HGHL LNA IIP3
vs. CURRENT
14 TA = -40°C
TA = +25°C
12
10
TA = +85°C
8
6
4
2
4 6 8 10 12 14 16
LNA CURRENT (mA)
PCS-BAND HGHL LNA NOISE FIGURE
vs. FREQUENCY
2.0
1.9
1.8
1.7 4mA
1.6
8.4mA
1.5
1.4
1.3 15mA
1.2
1900
1920 1940 1960 1980
FREQUENCY (MHz)
2000
_______________________________________________________________________________________ 5
5 Page 
Triple/Dual-Mode CDMA LNA/Mixers
Layout Considerations
Keep RF signal lines as short as possible to minimize
losses and radiation. Use high Q components for the
LNA input-matching circuit to achieve the lowest possi-
ble noise figure. At the digital mixer outputs, keep the
differential signal lines together and of equal length to
ensure signal balance. For best gain and noise perfor-
mance, solder the exposed paddle evenly to the board
ground plane.
Table 3. MAX2338 PCS Band LNA S-Parameters High-Gain, High-Linearity Mode
FREQUENCY (MHz)
|S11|
∠S11
|S21|
∠S21
|S12|
∠S12
|S22|
30
0.890
-4.9
0.002
-95
0.001
-112
0.996
50
0.883
-7.2
0.001
-60
0.001
-121
0.990
100
0.872
-13.2
0.391
-81
0.002
-178
0.980
200
0.841
-25
0.882
-112
0.007
171
0.970
300
0.799
-35
1.42
-131
0.010
150
0.959
400
0.778
-41
2.1
-153
0.02
125 0.947
600
0.750
-62
2.15
-172
0.02
100 0.943
800
0.706
-75
2.2
162 0.025 80 0.944
1000
0.676
-85
2.45
150 0.029
65
0.919
1200
0.659
-94
2.59
142 0.032
42
0.879
1500
0.634
-108
3.03
134 0.036
31
0.824
1750
0.578
-110
3.58
126 0.038
19
0.780
1900
0.560
-90.8
3.64
120.6
0.04
11.8 0.740
1910
0.558
-91.0
3.64
119.6
0.04
9.06 0.738
1920
0.554
-91.4
3.64
118.9
0.04
8.8 0.733
1930
0.551
-91.7
3.63
118.2
0.04
6.7 0.729
1940
0.547
-92.2
3.63
117.7
0.04
5.3 0.725
1950
0.543
-92.2
3.63
117.0
0.04
4.87 0.720
1960
0.538
-92.4
3.63
116.5
0.04
4.1 0.716
1970
0.536
-92.5
3.61
115.9
0.04
1.8 0.716
1980
0.533
-92.9
3.60
115.2
0.04
1.5 0.711
1990
0.530
-93.0
3.59
114.7
0.04
0 0.707
2000
0.523
-93.4
3.57
113.0
0.04
-2.1 0.702
2250
0.347
-155
2.88
131
0.05
-32 0.518
2500
0.298
-158
2.71
172
0.05
-72 0.489
3000
0.273
-160
2.64
-165
0.06
-94 0.473
4000
0.245
-170
2.03
-145
0.067
-120
0.425
∠S22
-48
-73
-114
-150
-166
-173
173
151
133
115
94.4
81
61.7
60.7
59.6
58.5
57.4
56.1
55.0
53.6
52.3
50.9
49.5
24
5
-18
-30
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX2338.PDF ] | |
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