MAX2676EWT+T Maxim Integrated Products, MAX2676EWT+T Datasheet - Page 7

• Manufacturer Part Number: MAX2676EWT+T
• Description: RF Amplifier GPS/GNSS LNA with An ntenna bypass switch
• Manufacturer: Maxim Integrated Products

Specifications of MAX2676EWT+T

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

The MAX2674/MAX2676 are low-power LNAs designed
for GPS/GNSS receiver applications. The devices feature
low noise and high linearity in an ultra-small package.
They also include an antenna switch and circuitry sup-
porting bias to accommodate external LNA applications.
To achieve optimal performance in noise figure, gain,
and IIP3, the devices require one matching inductor at
RFIN in series with a DC-blocking capacitor. RFOUT/
SHDN is internally matched to 50I, eliminating the need
for external matching components. At RFOUT/SHDN, an
external DC-blocking capacitor should be used to isolate
the shutdown control function.
To place the device in shutdown mode, apply logic-low
to RFOUT/SHDN through a 25kΩ resistor. An additional
DC-blocking capacitor or component is required at
RFOUT/SHDN in this case. Apply a logic-high state or no
DC bias to turn the part permanently on.
Table 1. MAX2674 Typical Noise Parameters (V
Table 2. MAX2676 Typical Noise Parameters (V
GPS/GNSS LNAs with Antenna Switch and Bias
FREQUENCY (MHz)
FREQUENCY (MHz)
1550
1560
1570
1580
1590
1600
1550
1560
1570
1580
1590
1600
Input and Output Matching
Detailed Description
NF
NF
MIN
0.651
0.652
0.654
0.655
0.656
0.657
MIN
0.744
0.746
0.748
0.751
0.753
0.75
(dB)
Shutdown Mode
(dB)
GAMMA_OPT MAG (°)
GAMMA_OPT MAG (°)
0.446
0.445
0.445
0.444
0.444
0.443
0.441
0.439
0.438
0.437
0.436
0.44
A properly designed PC board (PCB) is essential to any
RF microwave circuit. Use controlled-impedance lines
on all high-frequency inputs and outputs. Bypass V
with a decoupling capacitor located close to the device.
For long V
decoupling capacitors. Locate these additional capaci-
tors further away from the device package.
Proper grounding of GND_ pins is essential. If the PCB
uses a top-side RF ground, connect it directly to the
GND_ pins. For a board where the ground is not on the
component layer, connect the GND_ pins to the board
with multiple vias close to the package.
The MAX2674/MAX2676 ANT input includes an autode-
tection feature. When no current is drawn from ANT, the
switch defaults to normal LNA operation. The pin can be
directly connected to an external active antenna. The
device automatically switches to the ANT input when an
external active antenna is connected.
Refer to
EV Kit schematic, layout files, BOM information, and
S-parameters.
CC
CC
= 2.85V, T
= 2.85V, T
www.maxim-ic.com
CC
GAMMA_OPT PHASE (°)
GAMMA_OPT PHASE (°)
DC Supply Decoupling and Layout
lines, it may be necessary to add additional
A
A
44.1
44.3
44.6
44.8
45.1
45.4
53.1
53.4
53.7
54.3
54.7
54
= +25°C)
= +25°C)
Antenna Switch Control
for the MAX2674/MAX2676
Rn (I)
Rn (I)
8.33
8.33
8.32
8.31
8.68
8.66
8.65
8.63
8.62
8.3
8.3
8.7
CC
7