EVALUATION KIT AVAILABLE MAX2678 GPS/GNSS Front-End Amplifier General Description Features The MAX2678 GPS/GNSS front-end amplifier IC is First Amplifier Noise Figure: 0.9dB designed for automotive and marine GPS/GNSS satellite High Gain:* 35dB navigation antenna modules, or for any application that 3.4dB Gain Step needs to compensate for cable losses from the antenna to receiver. Two unconditionally stable low-noise amplifier Shared V and RFOUT2 Pin CC stages provide the high gain and integrated I/O matching Integrated 50 Output Matching to minimize the need for external matching components AMP 2 includes 50 Input Matching and eliminate the need for additional gain stages. The 3.0V to 5.25V Supply Voltage Range IC features the option to place a bandpass ceramic or surface acoustic wave (SAW) filter between the two amplifi- Small (3mm x 3mm) Low-Cost Package er stages for improved immunity to out-of-band interferers. AEC-Q100 Qualified Additionally, a 3.4dB-gain step is provided to compensate ESD Protected to 2kV Human Body Model for cable loss variation between different applications. -40C to +105C Ambient Temperature Range The device is designed to operate across all GNSS frequency standards with a 35dB typical cascaded gain Applications and a 25mA supply current. The two LNA stages allow Integrated Automotive and Marine GPS Receivers the use of a wide range of GNSS filter types for maximum flexibility in system design. The final RF output pin, which Active Antennas drives the cable to the GNSS receiver, is also the power- supply connection that accepts a DC supply in the 3.0V to 5.25V range. Alternatively, the DC supply can be applied *First amplifier input is impedance matched (S = -10dB). 11 to pin 4. Second amplifier is set to high gain. Amplifiers are cascaded This GPS/GNSS front-end amplifier is available in a lead- without interstage filter. free, 10-pin TDFN surface-mount package (3mm x 3mm). Electrical performance is guaranteed over the extended Ordering Information and Typical Operating Circuit appear at end of data -40C to +105C temperature range. sheet. Functional Diagram TOP VIEW + RFIN2 1 10 RFOUT1 MAX2678 GND GND 2 9 AMP 2 GND 3 8 GND AMP 1 EXTCAP/ALT V 4 7 GAIN SELECT CC DC RFOUT2/V 5 6 RFIN1 CC GENERATION TDFN 19-8660 Rev 1 11/18MAX2678 GPS/GNSS Front-End Amplifier Absolute Maximum Ratings RFOUT2/V , EXTCAP/ALT V , Multi-Layer Board CC CC V to GND ......................................................-0.3V to +5.5V (derate 24.4mW/C above +70C) ............................1951mW CC GAIN SELECT, Operating Ambient Temperature Range ........... -40C to +105C RFOUT1 to GND ..............-0.3V to (V + 0.25V, but 5.5V) Maximum Junction Temperature .....................................+150C CC RFIN1, RFIN2 Input Power (50 source) ......................+15dBm Storage Temperature Range ............................ -65C to +150C RFIN1, RFIN2 to GND ............................................-0.3V to +1V Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) .......................................+260C A Single-Layer Board (derate 18.5mW/C above +70C) ............................1481mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 1) Thermal Resistance, Single-Layer Board: Thermal Resistance, Four-Layer Board: Junction-to-Ambient ( )............................................54C/W Junction-to-Ambient ( )............................................41C/W JA JA Junction-to-Case Thermal Resistance ( ) .................9C/W Junction-to-Case Thermal Resistance ( ) .................9C/W JC JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal- tutorial. DC Electrical Characteristics (V = 3.0V to 5.25V, T = -40C to +105C. Typical values are at +5.0V and at T = +25C. Pin 7 is open, unless otherwise noted.) IN A A (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.0 5.25 V CC T = +25C 15.0 25 32 A Supply Current I mA CC T = -40C to +105C 35 A Gain-Select Input Current I V = 0V 20 100 A IL IL AC Electrical Characteristics (V = 3.0V to 5.25V, P = -40dBm, f = 1575MHz, T = -40C to +105C. Typical values are at 5.0V and at T = +25C. AMP 1 CC IN IN A A input matched to 50. All ports terminated in 50. Pin 7 is open, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Frequency f 1575 MHz RF AMP 1 Gain S 14 17 20 dB 21 1 AMP 1 Gain Variation Over 0.3 dB Temperature AMP 1 Noise Figure 0.9 dB NF1 AMP 1 Input Third-Order Two tones at 1574.5MHz and 1575.5MHz, -12 dBm IIP3 Intercept Point -35dBm per tone AMP 1 Input 1dB -18 dBm Compression Point AMP 1 Input Return Loss S dB 11 1 -9 AMP 1 Output Return Loss S dB 22 1 -15 AMP 1 Reverse Isolation S dB 12 1 -33 AMP 2 Gain S dB 21 2 14.5 18 22 AMP 2 Gain Step Gain change when pin 7 is shorted to GND dB -2 -3.4 -6 Maxim Integrated 2 www.maximintegrated.com