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MAX2686L /MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Bump Configuration
TOP VIEW
+
V CC
A1
A2
RFOUT (SHDN)
MAX2686L
MAX2693L
RFIN
B1
B2
GND
WLP
Bump Description
BUMP
A1
A2
B1
B2
NAME
V CC
RFOUT
( SHDN )
RFIN
GND
FUNCTION
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 50 I and pulled up to V CC through a 1M I
resistor. SHDN is shared with the RFOUT bump. The devices are in active mode by default once
V CC is applied. RFOUT( SHDN ) can be pulled to a DC low through a 25k I resistor to shut down
the IC.
RF Input. Requires a DC-blocking capacitor and external matching components.
Ground. Connect to the PCB ground plane.
Detailed Description
The MAX2686L /MAX2693L are LNAs designed for GPS
L1, Galileo, and GLONASS applications. The devices fea-
ture an optional power-shutdown control mode to elimi-
nate the need for an external supply switch. The devices
achieve high gain and low noise figure in an ultra-small
package ideal for space-sensitive applications. These
integrated ICs eliminate the need for an external LDO.
Input and Output Matching
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 Operating
Circuit shows the recommended input-matching net-
work. These values are optimized for the best simulta-
neous gain, noise figure, and return loss performance.
The value of the input coupling capacitor affects IIP3.
A smaller coupling capacitor results in lower IIP3. The
devices integrate an on-chip output matching to 50 I at
the output, eliminating the need for external matching
components. Table 1 and Table 2 list typical device S
parameters and K f values. Typical noise parameters are
shown in Table 3 and Table 4 .
Shutdown
The devices include an optional shutdown feature to turn
off the entire chip. The devices are placed in active mode
by default once V CC is applied, due to the on-chip pul-
lup resistor to V CC at the RFOUT bump (shared with 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., 25k I , in order not to load the RF
output signal during active operation.
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