7Maxim Integrated
GPS/GNSS Ultra-Low-Noise-Figure LNAs
MAX2667/MAX2669
Table 1. MAX2667 Typical Device S-Parameter Values and K-Factor
Table 2. MAX2669 Typical Device S-Parameter Values and K-Factor
Shutdown
The devices include a shutdown feature to turn off the
entire chip. A logic-high must be applied to the RFOUT/
(SHDN) pin using a 25kΩ external resistor to place the
part in active mode, and a logic-low to place the part in
shutdown mode.
Applications Information
A properly designed PCB is essential to any RF micro-
wave circuit. Use controlled-impedance lines on all
high-frequency inputs and outputs. Bypass VCC with
decoupling capacitors located close to the device. For
long VCC lines, it may be necessary to add decoupling
capacitors. Locate these additional capacitors further
away from the device package. Proper grounding of
the GND_ pins is essential. If the PCB uses a topside
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.
FREQ.
(MHz)
S11 MAG
(dB)
S11
PHASE
(Degrees)
S21 MAG
(dB)
S21
PHASE
(Degrees)
S12 MAG
(dB)
S12
PHASE
(Degrees)
S22 MAG
(dB)
S22
PHASE
(Degrees)
Kf
1000 -2.0 -47.7 6.0 -100.0 -47.5 -148.0 -1.0 -55.0 5.1
1100 -2.1 -48.6 7.4 -100.6 -45.7 -150.0 -1.0 -58.1 3.8
1200 -2.2 -51.6 9.6 -107.3 -42.9 -153.5 -1.4 -65.4 3.1
1300 -2.4 -55.0 12.0 -117.2 -39.6 -160.2 -2.1 -74.1 2.5
1400 -2.7 -58.6 14.0 -129.5 -37.0 -168.5 -3.6 -85.5 2.3
1500 -6.5 -61.9 16.2 -146.5 -34.1 178.5 -7.4 -100.0 2.8
1575 -4.3 -62.3 17.1 -164.2 -32.9 162.8 -15.3 -100.8 2.1
1600 -4.6 -61.6 17.3 -170.6 -32.8 156.6 -20.6 -78.9 2.0
1700 -5.4 -55.3 17.1 165.5 -32.5 136.5 -9.5 10.0 1.8
1800 -5.2 -49.8 15.7 145.8 -33.8 121.6 -4.5 -2.4 1.6
1900 -4.8 -47.3 13.9 135.2 -35.2 113.8 -2.7 -13.2 1.6
2000 -4.5 -46.7 12.7 127.3 -36.7 109.6 -1.8 -21.2 1.5
FREQ.
(MHz)
S11 MAG
(dB)
S11
PHASE
(Degrees)
S21 MAG
(dB)
S21
PHASE
(Degrees)
S12 MAG
(dB)
S12
PHASE
(Degrees)
S22 MAG
(dB)
S22
PHASE
(Degrees)
Kf
1000 -3.0 -57.0 10.8 -120.0 -43.0 -154.0 -1.3 -65.0 3.2
1100 -3.3 -58.2 11.6 -124.5 -42.1 -155.0 -1.6 -70.2 3.3
1200 -3.5 -60.0 13.4 -134.6 -39.3 -160.5 -2.4 -79.6 2.8
1300 -3.8 -62.3 14.9 -148.0 -37.2 -168.3 -4.0 -90.0 2.7
1400 -4.3 -63.3 15.9 -162.3 -35.4 -178.2 -7.3 -101.0 2.7
1500 -4.9 -62.0 16.6 -178.9 -33.9 171.0 -14.5 -100.6 2.6
1575 -5.3 -59.7 16.6 168.0 -33.5 161.7 -19.6 -26.0 2.5
1600 -5.4 -58.5 16.5 163.9 -33.6 157.5 -16.7 -6.0 2.5
1700 -5.5 -53.7 15.8 149.3 -33.6 148.3 -9.0 3.6 2.3
1800 -5.3 -50.3 14.7 136.8 -34.2 142.5 -5.7 -2.8 2.2
1900 -5.1 -48.0 13.4 130.0 -35.1 139.6 -4.0 -9.6 2.3
2000 -4.9 -46.3 12.7 123.9 -35.8 138.6 -3.0 -15.0 2.1