19-5655 Rev 0 6/11 E V A L U A T I O N K I T A V A I L A B L E MAX2670 GPS/GNSS Front-End Amplifier General Description Features The MAX2670 GPS/GNSS front-end amplifier IC is S First Amplifier Noise Figure*: 1.0dB designed for automotive and marine GPS/GNSS satellite S High Gain**: 34.8dB navigation antenna modules or for any application that S 3.4dB Gain Step needs to compensate for cable losses from the antenna S Shared V and RFOUT2 Pin to receiver. Two unconditionally stable low-noise amplifier CC stages provide the high gain and integrated I/O matching S Integrated 50I Output Matching to minimize the need for external matching components S 3.0V to 5.5V Supply Voltage Range and eliminate the need for additional gain stages. The S Small, Low-Cost Package (3mm x 3mm) device features the option to place a bandpass ceramic or SAW filter between the two amplifier stages to provide S AEC-Q100 Qualified a narrow-band output to further improve the noise perfor- S ESD Protected to 2kV Human Body Model mance of the GPS/GNSS receiver. Additionally, a 3.4dB gain step is provided to compensate for cable loss varia- Applications tion between different applications. The device is designed to operate across all GNSS fre- Integrated Automotive and Marine GPS Receivers quency standards with a 34.8dB typical cascaded gain Active Antennas and a 25mA supply current. The two LNA stages allow the use of a wide range of GNSS filter types for maxi- mum flexibility in system design. The final RF output pin, *Without external input impedance match. which drives the cable to the GNSS receiver, is also the **First amplifier input is impedance matched (S = -10dB). 11 Second amplifier set to high gain. Amplifiers cascaded without power-supply connection that accepts a DC supply in interstage filter. the 3.0V to 5.5V range. Alternatively, the DC supply can be applied to pin 4. Ordering Information appears at end of data sheet. This GPS/GNSS front-end amplifier is designed on a low- noise, advanced SiGe process and is available in a lead- free, 10-pin TDFN surface-mount package (3mm x 3mm). Typical Operating Circuit appears at end of data sheet. Functional Diagram TOP VIEW + RFIN2 1 10 RFOUT1 MAX2670 GND GND 2 9 AMP 2 GND 3 8 GND AMP 1 EXTCAP/ALT VCC 4 7 GAIN SELECT DC RFOUT2/VCC 5 6 RFIN1 GENERATION TDFN For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX2670.related. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX2670 GPS/GNSS Front-End Amplifier ABSOLUTE MAXIMUM RATINGS RFOUT1, RFOUT2, EXTCAP to GND ....... -0.3V to (V + 0.5V) Storage Temperature Range ............................ -65NC to +150NC CC RFIN1 Input Power (50I source) ..................................+15dBm Lead Temperature (soldering, 10s) ................................+300NC GAIN SELECT to GND ............................. -0.3V to (V + 0.3V) Soldering Temperature (reflow) ......................................+260NC CC Continuous Power Dissipation (T = +70NC) A TDFN (derate 18.5mW/NC above +70NC) ..................1481mW Operating Ambient Temperature Range ......... -40NC to +105NC Maximum Junction Temperature .....................................+150NC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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. DC ELECTRICAL CHARACTERISTICS (V = 3.0V to 5.5V, T = -40NC to +105NC. Typical values are at +5.0V and at T = +25NC. Pin 7 open, unless otherwise noted.) IN A A (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.0 5.5 V CC T = +25NC 15.0 25 30 A Supply Current I mA CC T = -40NC to 105NC 30 A Gain-Select Input Current I V = 0V 20 100 FA IL IL AC ELECTRICAL CHARACTERISTICS (V = 3.0V to 5.5V, P = -40dBm, f = 1575MHz, T = -40NC to +105NC. Typical values are at 5.0V and at T = +25NC. Input CC IN IN A A matched to 50I, load = 50I, pin 7 open, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operation Frequency f 1575 MHz RF 50I source with no input match (Note 2) 14.5 16.7 19 AMP 1 Gain S dB 21 50I source with input match 17.8 AMP 1 Gain Variation Over 0.3 dB Temperature AMP 1 Noise Figure NF No input match (Notes 2, 3) 1 dB AMP 1 Input Third-Order Two tones at 1574.5MHz and 1575.5MHz, IIP3 -12 dBm Intercept Point -35dBm per tone AMP 1 Input 1dB Compression 50I source with no input match (Note 2) -19 dBm Point AMP 1 Input Return Loss S No input match (Note 2) -4.4 dB 11 AMP 1 Output Return Loss S -14.5 dB 22 AMP 1 Reverse Isolation S -33 dB 12 AMP 2 Gain S 14.5 17 21 dB 21 AMP 2 Gain Step Gain change when pin 7 is shorted to GND -2.5 -3.4 -4.0 dB AMP 2 Gain Variation Over 1 dB Temperature AMP 2 Noise Figure NF (Note 3) 2.0 dB Maxim Integrated Products 2