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PDF MAX2686 Data sheet ( Hoja de datos )
| Número de pieza | MAX2686 | |
| Descripción | (MAX2686 / MAX2688) GPS/GNSS Low-Noise Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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DataSheet.in
19-5456; Rev 0; 8/10
EVAALVUAAILTAIOBNLEKIT
GPS/GNSS Low-Noise Amplifiers
General Description
The MAX2686/MAX2688 low-noise amplifiers (LNAs) are
designed for GPS L1, Galileo, and GLONASS applica-
tions. Designed in Maxim’s advanced SiGe process,
the devices achieve high gain and ultra-low-noise figure
while maximizing the input-referred 1dB compression
point and the 3rd-order intercept point. The MAX2686
provides a high gain of 19dB. The MAX2688 supplies
15dB of gain while attaining higher linearity.
The devices operate from a +1.6V to +3.3V single sup-
ply. The optional shutdown feature in the devices reduc-
es the supply current to less than 10FA. The devices
are available in a very small, lead-free, RoHS-compliant,
0.86mm x 0.86mm x 0.65mm wafer-level package (WLP).
Applications
Automotive Navigation
Telematics (Asset Tracking and Management)
Personal Navigation Devices (PNDs)
Cellular Phones with GPS
Notebook PCs/Ultra-Mobile PCs
Recreational, Marine Navigation
Avionics
Watches
Digital Cameras
Features
S High-Power Gain: 19dB (MAX2686)
S Ultra-Low-Noise Figure: 0.75dB (MAX2686)
S Integrated 50Ω Output Matching Circuit
S Low Supply Current: 4.1mA
S Wide Supply Voltage Range: 1.6V to 3.3V
S Low Bill of Materials: One Inductor, Two
Capacitors
S Small Footprint: 0.86mm x 0.86mm
S Thin Profile: 0.65mm
S 0.4mm-Pitch Wafer-Level Package (WLP)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX2686EWS+T
MAX2688EWS+T
-40NC to +85NC
-40NC to +85NC
4 WLP
4 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Application Circuit
RF
INPUT
VCC
C2
VCC A1
C1 L1 RFIN B1
MAX2686
MAX2688
A2
RFOUT
RF
OUTPUT
R1
25kI
SHDN
OPTIONAL SHUTDOWN
B2 GND
MAX2686 MAX2688
L1 = 6.8nH L1 = 6.2nH
C1 = 100nF C1 = 100nF
C2 = 10pF C2 = 10pF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
DataSheet.in
GPS/GNSS Low-Noise Amplifiers
TOP VIEW
+
VCC A1
A2
MAX2686
MAX2688
RFIN B1
B2
RFOUT (SHDN)
GND
WLP
Bump Configuration
BUMP
A1
A2
B1
B2
NAME
VCC
RFOUT
(SHDN)
RFIN
GND
Bump Description
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 50I and pulled up to VCC through a 1MI
resistor. SHDN is shared with the RFOUT bump. The devices are in active mode by default once
VCC is applied. RFOUT(SHDN) can be pulled to a DC low externally 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 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.
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
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
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 Kf values. Typical noise parameters
are shown in Tables 3 and 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 VCC is applied, due to the on-chip
pullup resistor to VCC 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., 25kI, in order not to load the
RF output signal during active operation.
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX2686.PDF ] | |
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