19-1807; Rev 2; 4/03
KIT
ATION
EVALU
BLE
AVAILA
Triple/Dual-Mode CDMA LNA/Mixers
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
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.
MAX2338
Ordering Information
________________________Applications
Dual-Band, Triple-Mode PCS/Cellular Phones
Dual-Mode Cellular Phones
PART
MAX2338EGI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QFN
Pin Configuration/
Functional Diagram
CLNAOUT
CMIXIN
22
PMIXIN
23
TOP VIEW
PLNAOUT
Typical Operating Circuit appears at end of data sheet.
GND
GND
25
28
27
26
RLNA 1
PLNAIN 2
GND 3
CLNAIN 4
BAND 5
LIN 6
GAIN 7
GND
24
21 RBIAS
20 IF+
19 IF-
18 GND
MAX2338
÷2
17 BUFFEN
16 V
CC
15 FMOUT
8
GND
9
LO/2
10
LOIN
11
GND
12
PLOOUT
13
CLOOUT
14
N.C.
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.
Triple/Dual-Mode CDMA LNA/Mixers
MAX2338
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND..........................................................+0.3V to +4.3V
Digital Input Voltage to GND ......................-0.3V to (V
CC
+ 0.3V)
LNA Input Level...............................................................1V peak
LO, Mixer Input Levels .....................................................+5dBm
Digital Input Current .........................................................±10mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QFN (derate 28.5mW/°C above T
A
= +70°C).........2W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°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
(V
CC
= +2.7V to +3.3V, R
RBIAS
= R
RLNA
= 24kΩ, BUFFEN = LOW, all RF and IF outputs connected to V
CC
, no RF applied, T
A
= -40°C
to +85°C. Typical values are at +3.0V and T
A
= +25°C, unless otherwise noted. Refer to Operational Modes table for control logic.)
PARAMETER
PCS CDMA MODES
Operating Supply Current
CELLULAR CDMA MODE
Low-gain mode
Operating Supply Current
FM MODE
Operating Supply Current
SHUTDOWN MODE
Shutdown Supply Current
ALL MODES
LO Buffer Supply Current
Additional Operational Current
Divider Active
Digital Input Logic High
Digital Input Logic Low
Digital Input High Current
Digital Input Low Current
-25
BUFFEN = HIGH
LO/2 = LOW
LO/2 = HIGH
7.2
10.3
1.2
2.0
0.6
5
9.5
mA
mA
V
V
µA
µA
0.1
5
µA
13.5
17
mA
High-gain, low-linearity mode
High-gain, high-linearity mode
19.5
18
28
25
24
35
mA
High-gain, low-linearity mode
High-gain, high-linearity mode
18
25
24
33
mA
CONDITIONS
MIN
TYP
MAX
UNITS
Cellular and FM mode; LO/2 = HIGH
2
_______________________________________________________________________________________
Triple/Dual-Mode CDMA LNA/Mixers
AC ELECTRICAL CHARACTERISTICS
(MAX2338 EV kit, V
CC
= +2.7V to +3.3V, f
PLNAIN
= f
PMIXIN
= 1930MHz to 1990MHz, f
CLNAIN
= f
CMIXIN
= 869MHz to 894MHz, f
IF
=
183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, R
RLNA
= R
RBIAS
= 24kΩ, T
A
= -40°C to +85°C. Typical values are at
T
A
= +25°C, V
CC
= +3.0V, unless otherwise noted.)
PARAMETER
OVERALL PERFORMANCE
Low-Band RF Frequency Range
High-Band RF Frequency Range
Low-Band LO Frequency Range
High-Band LO Frequency Range
IF Frequency Range
LO Input Level
CELLULAR LNA PERFORMANCE
HIGH-GAIN, HIGH-LINEARITY MODES
Gain (Note 2)
Noise Figure (Note 3)
Noise Figure Change Due to
Temperature
IIP3 (Notes 3, 4)
CDMA HIGH-GAIN, LOW-LINEARITY MODE AND FM MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Note 3, 4)
CDMA LOW-GAIN MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Notes 3, 4)
PCS LNA PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
Noise Figure Change Due to
Temperature
IIP3 (Notes 3, 5)
CDMA HIGH-GAIN, LOW-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Notes 3, 5)
CELLULAR MIXER PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY, AND LOW-GAIN MODES
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Note 4)
T
A
= +25°C
3.0
10.3
13.3
7.8
5.5
16.4
9.0
dB
dB
dBm
T
A
= +25°C
2.5
13.0
14.5
1.4
7.5
16.5
1.7
dB
dB
dBm
T
A
= +25°C
T
A
= +25°C to T
MAX
5.0
13.8
15.3
1.4
0.3
7.7
16.9
1.7
dB
dB
dB
dBm
15
-4.0
-2.3
5
18
0
6
dBm
dB
dBm
T
A
= +25°C
2.5
13
14.7
1.4
5.5
16.5
1.7
dB
dB
dBm
T
A
= +25°C
T
A
= +25°C to T
MAX
9.5
14.0
15.7
1.4
0.3
12
17.0
1.6
dB
dB
dB
dBm
After divider if active (Note 1)
(Note 1)
(Note 1)
869
1930
950
1750
80
-7
-3
894
1990
1100
2210
220
0
MHz
MHz
MHz
MHz
MHz
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2338
_______________________________________________________________________________________
3
Triple/Dual-Mode CDMA LNA/Mixers
MAX2338
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2338 EV kit, V
CC
= +2.7V to +3.3V, f
PLNAIN
= f
PMIXIN
= 1930MHz to 1990MHz, f
CLNAIN
= f
CMIXIN
= 869MHz to 894MHz, f
IF
=
183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, R
RLNA
= R
RBIAS
= 24kΩ, T
A
= -40°C to +85°C. Typical values are at
T
A
= +25°C, V
CC
= +3.0V, unless otherwise noted.)
PARAMETER
HIGH-GAIN, LOW-LINEARITY IDLE MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Notes 3, 4)
FM MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Note 4)
PCS MIXER PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Notes 3, 5)
HIGH-GAIN, LOW-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Note 5)
ALL MODES
Mixer Output 1dB Compression
4 x 5 Suppression (Note 6)
2 x 2 Input Intercept Point (Notes 3, 7)
LO Output Level (Note 3)
LO Output Leakage
LO Emission at PCS LNA Input Port
LO Emission at Cellular LNA Input
Port
LO Output Harmonic Suppression
LO Output Noise Power
RF Ports Return Loss
BUFFEN = HIGH
BUFFEN = HIGH
PCS band, 80MHz below LO
Cellular band, 45MHz below LO
Into 50Ω or 100Ω load, BUFFEN = HIGH
BUFFEN = LOW
25
-12
-1
>45
33
-6
-35
-55
-55
-15
-161
-161
10
dBm
dB
dBm
dBm
dBm
dBm
dBm
dBc
dBm/Hz
dB
T
A
= +25°C
0.5
11.2
14
7.2
2.5
16.2
9.0
dB
dB
dBm
T
A
= +25°C
3.5
11.7
14.5
7.8
7.5
17
9.0
dB
dB
dBm
T
A
= +25°C
1.4
6.0
8.8
8.7
3.4
11.1
11.0
dB
dB
dBm
T
A
= +25°C
1.4
10.1
13
7.3
3.5
16
9.0
dB
dB
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
All active RF ports including 2-element matching
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Operation over this frequency range may require the ports to be rematched for the desired operating frequency.
MIN guaranteed by production test, MAX guaranteed by design and characterization.
Guaranteed by design and device characterization.
Two-tone IIP3. Tested at f
RF1
= 880MHz, f
RF2
= 880.9MHz, and power = -25dBm/tone.
Two-tone IIP3. Tested at f
RF1
= 1960MHz, f
RF2
= 1961.25MHz, and power = -25dBm/tone.
F
LO
= 1064MHZ, f
RF1
= 887.8MHz at -30dBm, f
RF2
= 881MHz at -100dBm. Performance is measured as P
IF
due to
RF1 - P
IF
due to RF2.
Note 7:
F
LO
= 2143MHz, f
RF1
= 2051.5MHz at -35dBm, f
RF2
= 1960MHz at -100dBm. Performance is measured as P
IF
due to
RF1 - P
IF
due to RF2.
4
_______________________________________________________________________________________
Triple/Dual-Mode CDMA LNA/Mixers
MAX2338
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
PCS-BAND HGHL LNA GAIN
vs. CURRENT
MAX2338 toc02
PCS-BAND SUPPLY CURRENT
MAX2338 toc01
CELLULAR-BAND SUPPLY CURRENT
30
HGHL
25
SUPPLY CURRENT (mA)
20
15
10
5
0
HGLL
FM
12
11
10
-50
0
50
100
4
LGHL
GAIN (dB)
17
16
15
14
HGHL
25
SUPPLY CURRENT (mA)
20
15
10
5
0
-50
0
50
HGLL
TA = -40°C
TA = +25°C
13
TA = +85°C
100
6
8
10
12
14
16
TEMPERATURE (°C)
TEMPERATURE (°C)
LNA CURRENT (mA)
CELLULAR-BAND HGHL LNA GAIN
vs. CURRENT
MAX2338 toc04
CELLULAR-BAND LNA GAIN
vs. FREQUENCY
MAX2338 toc05
PCS-BAND LNA GAIN
vs. FREQUENCY
16
15
14
GAIN (dB)
13
12
11
10
HGLL
HGHL
MAX2338 toc06
18
TA = -40°C
17
16
GAIN (dB)
15
14
13
12
4
6
8
10
12
14
16
18
TA = +25°C
TA = +85°C
20
HGHL
15
HGLL, FM
GAIN (dB)
10
17
5
0
LGHL
9
8
-5
20
850
860
870
880
890
900
LNA CURRENT (mA)
FREQUENCY (MHz)
7
1900
1920
1940
1960
1980
2000
FREQUENCY (MHz)
PCS-BAND HGHL LNA IIP3
vs. CURRENT
MAX2338 toc07
CELLULAR-BAND HGHL LNA IIP3
vs. CURRENT
TA = -40°C
TA = +25°C
MAX2338 toc08
PCS-BAND HGHL LNA NOISE FIGURE
vs. FREQUENCY
1.9
1.8
NOISE FIGURE (dB)
MAX2338 toc09
10
9
8
IIP3 (dBm)
T
A
= +25°C
6
5
4
3
2
4
5
6
7
8
9
LNA CURRENT (mA)
T
A
= +85°C
T
A
= -40°C
14
12
10
IIP3 (dBm)
8
6
4
2
4
6
8
10
12
2.0
7
TA = +85°C
1.7
1.6
1.5
1.4
1.3
1.2
1900
1920
1940
4mA
8.4mA
15mA
14
16
1960
1980
2000
LNA CURRENT (mA)
FREQUENCY (MHz)
_______________________________________________________________________________________
MAX2338 toc03
30
5
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