MAX2538 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX2538 Datasheet PDF : 27 Pages
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Quadruple-Mode PCS/Cellular/GPS LNA/Mixers
Table 2. Modes of Operation
BAND
OPERATION MODE
LNA
MIXER
IF PORT
G2
G1
MODE BAND
HGHL
HGHL
HL
IF0 or IF1
0
0
1
0
HGLL
HGLL
LL
IF0 or IF1
0
0
0
0
Cellular
MG
MG
HL
IF0 or IF1
0
1
X
0
LG
LG
LL
IF0 or IF1
1
1
X
0
ULG
LG
LG
IF0 or IF1
1
0
X
0
HGHL
HGHL
HL
IF0 or IF1
0
0
1
1
PCS
LG
LG
LL
IF0 or IF1
1
1
X
1
ULG
LG
LG
IF0 or IF1
1
0
X
1
GPS*
GPS
GPS
GPS
GIF
0
0
0
1
*MAX2530/MAX2531/MAX2537/MAX2538 only.
X = Don’t care.
Table 3. LO Frequency Plan
PART
MAX2351
MAX2354
MAX2358
MAX2359
MAX2530
MAX2531
MAX2537
MAX2538
VCO FREQUENCY
Cell Band VCO
Cell Band VCO
PCS Band VCO
PCS Band VCO
Cell and PCS Dual-Band VCO
Cell Band VCO
PCS Band VCO
PCS Band VCO
CELLULAR LO
FREQUENCY
fVCO
fVCO
0.5 x fVCO
—
fVCO
fVCO
0.5 x fVCO
0.5 x fVCO
PCS LO FREQUENCY
2 x fVCO
—
fVCO
fVCO
fVCO
2 x fVCO
—
fVCO
GPS LO
FREQUENCY
—
—
—
—
(2/3) fVCO
(4/3) fVCO
(2/3) fVCO
(2/3) fVCO
GPS Interstage
The GPS LNA and mixer include on-chip resonant tanks
that can be used instead of a saw filter for image sup-
pression. These tanks are coupled by an external L-C
network between pins 8 and 10 as shown in the Typical
Application Circuit.
Layout Considerations
Keep RF signal lines as short as possible to minimize
losses and radiation. Use controlled impedance on all
high-frequency traces. Use high-Q (>40) components
for the LNA input-matching circuit to achieve the lowest
possible noise figure. At the mixer outputs, keep the
differential signal lines together and of equal length to
ensure signal balance. For proper operation, solder the
exposed paddle evenly to the ground plane. Use abun-
dant ground vias between RF traces to minimize unde-
sired coupling.
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