MAX2538ETI+T Maxim Integrated Products, MAX2538ETI+T Datasheet - Page 11

• Manufacturer Part Number: MAX2538ETI+T
• Description: RF Mixer IC LNA/MIXER CELL/PCS/GPS
• Manufacturer: Maxim Integrated Products

Specifications of MAX2538ETI+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Modes of Operation
*MAX2530/MAX2531/MAX2537/MAX2538 only.
X = Don’t care.
Table 3. LO Frequency Plan
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.
MAX2351
MAX2354
MAX2358
MAX2359
MAX2530
MAX2531
MAX2537
MAX2538
Cellular
BAND
GPS*
PCS
Quadruple-Mode PCS/Cellular/GPS LNA/Mixers
PART
OPERATION MODE
______________________________________________________________________________________
Cell and PCS Dual-Band VCO
HGHL
HGHL
HGLL
ULG
ULG
GPS
MG
LG
LG
VCO FREQUENCY
PCS Band VCO
PCS Band VCO
PCS Band VCO
PCS Band VCO
Cell Band VCO
Cell Band VCO
Cell Band VCO
GPS Interstage
HGHL
HGHL
HGLL
LNA
GPS
MG
LG
LG
LG
LG
MIXER
GPS
HL
HL
LG
HL
LG
LL
LL
LL
CELLULAR LO
FREQUENCY
0.5 x f
0.5 x f
0.5 x f
f
f
f
f
VCO
VCO
VCO
VCO
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.
—
VCO
VCO
VCO
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF0 or IF1
IF PORT
GIF
PCS LO FREQUENCY
G2
0
0
0
1
1
0
1
1
0
2 x f
2 x f
f
f
f
f
VCO
VCO
VCO
VCO
—
—
VCO
VCO
Layout Considerations
G1
0
0
1
1
0
0
1
0
0
MODE
1
0
X
X
X
1
X
X
0
FREQUENCY
(2/3) f
(4/3) f
(2/3) f
(2/3) f
GPS LO
—
—
—
—
VCO
VCO
VCO
VCO
BAND
0
0
0
0
0
1
1
1
1
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