MAX2745ECM+TD

19-3425; Rev 0; 10/04 KIT ATION EVALU LE B A IL A AV Single-Chip Global Positioning System Receiver Front-End The MAX2745 complete single-chip global positioning system (GPS) RF front-end downconverter utilizes many innovative and leading-edge RF CMOS design techniques. This high-performance, state-of-the-art device consumes extremely low power and eliminates the need for costly SAW and bulky discrete IF filters. The MAX2745 incorporates a fully integrated low-noise amplifier (LNA) and mixer, IF section, digital sampler, and local oscillator synthesizer. The MAX2745 also provides a voltage supply for an external LNA. In addition, the MAX2745 features a voltage booster, which can extend the power-supply voltage to as low as 1.6V. The MAX2745 supports both 3rd overtone crystal designs in 32MHz and fundamental frequency crystal designs in 16MHz, as well as a TCXO implementation. In addition, the MAX2745 incorporates an on-chip temperature sensor and crystal oscillator with trimmed capacitors, resulting in a very accurate frequency and additional system cost savings. The MAX2745 is available in a space-saving 48-pin TQFP package and is specified for the extended (-40°C to +85°C) temperature range. The power consumption of this device is as low as 41mW at 2.4V. Features ♦ Complete Single-Chip GPS Radio for 16.368MHz and 32.736MHz Floorplans ♦ Single-Ended or Differential Outputs at 4.092MHz ♦ Low 3.5dB Typical Noise Figure ♦ No External IF SAW or Discrete Filters Required ♦ On-Chip Temperature Sensor ♦ 2.4V to 3.6V Operational Supply Voltage Range ♦ Power Consumption as Low as 41mW at 2.4V ♦ Wide -40°C to +85°C Operational Temperature Range Ordering Information PART MAX2745ECM TEMP RANGE PIN-PACKAGE -40°C to +85°C 48 TQFP-EP* *EP = Exposed paddle. Typical Operating Circuit appears at end of data sheet Applications Block Diagram/ Pin Configuration Recreational Handheld/Walkie Talkies SHDN GND VDD CP_OUT GND VTUNE VDD VTO SDATA 48 47 46 45 44 43 42 41 40 39 38 37 36 BPF_CTRL RBIAS 1 VCXO CBIAS 2 Geographical Information Systems (GISs) VDD 3 Emergency Roadside Assistance VDD 4 Emergency Response Systems GND 5 Digital Cameras/Camcorders GND 6 Consumer Electronics VDD Telematics (Vehicle/Asset Tracking and Inventory Management) XTALOUT Location-Based Services (PDAs and Accessories) XTALIN In-Vehicle Navigation Systems (IVNSs) TEMPERATURE SENSOR MAX2745 35 ODS 34 CFS BIAS PFD 33 COE CHG PUMP DIVIDER 32 VDD 31 SCLK VSPORT LNA/MIXER VCO RFIN 7 30 GND 29 VOUT+ GND 8 VDD 9 28 VOUTBANDPASS FILTER QUANTIZER AGC 27 VDD IEXT_LNA 10 VDD 11 VOLTAGE BOOSTER FILTER AUTOMATIC TUNING 26 GND AGC_FIL 12 14 15 16 17 18 19 20 21 22 23 24 VDD GND XTAL_SSEL XTAL_CSEL BST_CTRL TEST_EN VDD_VB CKOUT DOUT VB_CS+ VB_CS- VOUT 25 VDD 13 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX2745 General Description MAX2745 Single-Chip Global Positioning System Receiver Front-End ABSOLUTE MAXIMUM RATINGS VDD to GND ...........................................................-0.3V to +3.7V Other Pins to GND......................................-0.3V to (VDD + 0.3V) RF LNA Input Power .......................................................+10dBm Continuous Power Dissipation (TA = +70°C) 48-Pin TQFP-EP (derate 12.5mW/°C above +70°C) ............1W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Soldering Temperature (10s) ...........................................+300°C CAUTION! ESD SENSITIVE DEVICE 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. DC ELECTRICAL CHARACTERISTICS (MAX2745 EV kit, VDD = +2.4V to +3.6V, SHDN = GND, TA = -40°C to +85°C. Typical values are at VDD = +3.0V and TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS Supply Voltage Supply Current Optional External LNA Supply Current MIN TYP 2.4 VDD = +3.0V, TA = +25°C (Note 1) 20.5 Shutdown mode MAX UNITS 3.6 V 27 mA 11 VDD = +3.0V µA 10 Logic-Input High Voltage 2.0 V Logic-Input Low Voltage Logic-Input Bias Current mA -10 0.5 V +10 µA AC ELECTRICAL CHARACTERISTICS (MAX2745 EV kit, VDD = +2.4V to +3.6V, SHDN = GND, TA = -40°C to +85°C. Typical values are at VDD = +3.0V and TA = +25°C, unless otherwise noted.) PARAMETER GENERAL PERFORMANCE Maximum Conversion Gain Input Frequency Noise Figure Return Loss (S11) LNA/Mixer Input IP3 Output IF Frequency OUTPUT STAGE Output Rise/Fall Time Output-Voltage-Level Low Output-Voltage-Level High 2 CONDITIONS (Notes 2, 3) Measured at quantizer output f1 = 5.09MHz and f2 = 7.09MHz above carrier frequency Differential (VOUT+, VOUT-), CL < 20pF Single ended (DOUT), CL