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PDF MAX2323 Data sheet ( Hoja de datos )
| Número de pieza | MAX2323 | |
| Descripción | Triple/Dual-Mode CDMA LNA/Mixers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1736; Rev 0; 7/00
Triple/Dual-Mode
CDMA LNA/Mixers
________________General Description
The MAX2323/MAX2325 are low-noise amplifier (LNA)
plus mixer ICs optimized for code-division multiple-access
(CDMA) applications in both cellular and PCS bands. The
MAX2323 addresses dual-band, triple-mode CDMA appli-
cations by providing switched signal paths for cellular FM,
cellular CDMA, and PCS CDMA. The MAX2325 is a cellu-
lar-band dual-mode version.
To optimize cellular-band dynamic range at minimum cur-
rent, the MAX2323/MAX2325 implement four LNA states:
high gain/high linearity, high gain/low linearity, midgain,
and low gain. In high-gain/high-linearity mode, the
adjustable high-intercept LNA minimizes desensitization in
the presence of a large interfering signal. For the other
gain states, the LNA current is reduced to improve stand-
by time.
The CDMA mixers are designed for high linearity, low
noise, and differential IF outputs, while the FM mixer is
designed for lower current and single-ended output. Each
band is implemented with a separate mixer to optimize
performance for the specific band.
The MAX2323/MAX2325 can also be used in TDMA,
EDGE, and W-CDMA phones.
____________________________Features
o 2.7V Operation
o Dual Band, Triple Mode
o Three LNA Gain Settings (Cellular)
o Two LNA Gain Settings (PCS)
o 18mA in Low-Gain Mode
19.5mA in Paging and Midgain Mode
26.5mA in High-Gain, High-Linearity Mode
16.5mA in FM Mode, High-Gain, Low-Linearity
Mode
o 2.5dB (typ) Cascade Noise Figure
o Adjustable LNA IIP3, +5dBm to +13dBm
o Ultra-Small 28-Pin Package (5mm x 5mm)
Ordering Information
PART
MAX2323EGI
MAX2325EGI
MAX2323EVKIT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN- PACKAGE
28 QFN
28 QFN
28 QFN
________________________Applications
Dual-Band, Triple-Mode PCS/Cellular Phones
Dual-Mode Cellular Phones
Typical Application Circuits appear at end of data sheet.
TOP VIEW
Pin Configuration/
Functional Diagram
28 27 26 25 24 23 22
RLNA 1
PLNAIN 2
GND 3
CLNAIN 4
SLEEP 5
G2 6
G1 7
MAX2323
21 RBIAS
20 CDMA+
19 CDMA-
18 GND
17 BAND
16 VCC
15 FMOUT
8 9 10 11 12 13 14
QFN
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Triple/Dual-Mode
CDMA LNA/Mixers
Pin Description
PIN
MAX2323 MAX2325
11
— 2, 10, 23
2—
NAME
FUNCTION
RLNA
N.C.
PLNAIN
LNA Bias-Setting Pin. For nominal bias, connect a 24kΩ resistor to ground. This
resistor value can be adjusted to alter the linearity of the input LNA in high-gain,
high-linearity CDMA modes.
No Connection. Leave this pin floating.
High-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.
3, 8, 11,
12, 13, 18,
24, 25, 27
3, 8, 11, 12,
13, 17, 18,
24, 25, 27
GND
Ground
4
5
6
7
9
10
14
15
16
17
19, 20
21
22
23
26
—
4
5
6
7
9
—
14
15
16
—
19, 20
21
22
—
—
26
CLNAIN
SLEEP
G2
G1
LOLIN
LOHIN
MODE
FMOUT
VCC
BAND
CDMA-,
CDMA+
RBIAS
CMIXIN
PMIXIN
PLNAOUT
VCC
Low-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.
Logic Input. High shuts off entire device.
Logic Input. See Tables 1 and 2 for details.
Logic Input. See Tables 1 and 2 for details.
Low-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.
High-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.
Logic Input. See Tables 1 and 2 for details.
FM IF Output Port. Requires a pull-up inductor and a DC blocking capacitor, which
may be used as part of the matching network.
2.7V to 3.6V Supply Pin. Must be capacitively bypassed near the pin.
Logic Input. High selects high band (PCS). Low selects low band (cellular).
Differential Output Port for CDMA Mode. Requires pull-up inductors and blocking
capacitors, which may be used as part of the matching network.
Bias Setting Pin. For nominal bias, connect a 20kΩ resistor to ground. This resistor
value can be adjusted to alter the linearity of the mixers in all modes and the LNA in all
modes except high gain and high linearity.
Low-Band Mixer Input Port. Requires blocking capacitor, which may be used as part of
the matching network.
High-Band Mixer Input Port. Requires blocking capacitor, which may be used as part
of the matching network.
High-Band LNA Output Port. This port requires an external pull-up inductor and series
capacitor as part of the matching network.
2.7 to 3.6V Supply Pin. Bypassing is not necessary at this pin.
_______________________________________________________________________________________ 5
5 Page 
Triple/Dual-Mode
CDMA LNA/Mixers
Typical Application Circuits
CELLULAR
VCC
PCS
PCS
CELLULAR
28 27 26 25
1
24 23
22
21
2 20
3 19
4
SLEEP 5
G2 6
MAX2323
18
17 BAND
16
G1 7
15
8
9
10 11
12 13
14
MODE
CELLULAR LO
PCS LO
VCC
CDMA
VCC
FM
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX2323.PDF ] | |
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