MAX2688EWS+T Maxim Integrated Products, MAX2688EWS+T Datasheet - Page 5

• Manufacturer Part Number: MAX2688EWS+T
• Description: RF Amplifier GPS-GNSS Low-Noise A Low-Noise Amplifiers
• Manufacturer: Maxim Integrated Products

Specifications of MAX2688EWS+T

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

The MAX2686/MAX2688 are LNAs designed for GPS
L1, Galileo, and GLONASS applications. The devices
feature an optional power-shutdown control mode to
eliminate the need for an external supply switch. The
devices achieve high gain, ultra-low-noise figure, and
excellent linearity.
The devices require an off-chip input matching. Only
an inductor in series with a DC-blocking capacitor is
needed to form the input matching circuit. The Typical
Application Circuit shows the recommended input-
matching network. These values are optimized for the
best simultaneous gain, noise figure, and return loss
performance. The value of the input coupling capacitor
BUMP
A1
A2
B1
B2
(SHDN)
RFOUT
NAME
RFIN
GND
V
CC
Input and Output Matching
Detailed Description
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
RF Output/SHDN Input. RFOUT is internally matched to 50I and pulled up to V
resistor. SHDN is shared with the RFOUT bump. The devices are in active mode by default once
V
RF Input. Requires a DC-blocking capacitor and external matching components.
Ground. Connect to the PCB ground plane.
CC
is applied. RFOUT(SHDN) can be pulled to a DC low externally to shut down the IC.
TOP VIEW
GPS/GNSS Low-Noise Amplifiers
RFIN
V
CC
+
A1
B1
MAX2686
MAX2688
WLP
A2
B2
affects IIP3. A smaller coupling capacitor results in lower
IIP3. The devices integrate an on-chip output matching
to 50I at the output, eliminating the need for external
matching components. Tables 1 and 2 list typical device
S parameters and K
are shown in Tables 3 and 4.
The devices include an optional shutdown feature to
turn off the entire chip. The devices are placed in active
mode by default once V
pullup resistor to V
the SHDN input). To shut down the part, apply a logic-
low to the RFOUT bump through an external resistor with
an adequate value, e.g., 25kI, in order not to load the
RF output signal during active operation.
RFOUT (SHDN)
GND
FUNCTION
CC
f
values. Typical noise parameters
at the RFOUT bump (shared with
CC
Bump Configuration
is applied, due to the on-chip
Bump Description
CC
through a 1MI
Shutdown
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