MAX2424EAI+

19-1350 Rev 3; 12/00 KIT ATION EVALU E L B A AVAIL 900MHz Image-Reject Receivers with Transmit Mixer ____________________________Features ♦ Receive Mixer with 35dB Image Rejection ________________________Applications Cordless Phones Wireless Telemetry ♦ Adjustable-Gain LNA ♦ Up to +2dBm Combined Receiver Input IP3 ♦ 4dB Combined Receiver Noise Figure ♦ Optimized for Common Receiver IF Frequencies: 10.7MHz (MAX2424) 70MHz (MAX2426) ♦ PA Predriver Provides up to 0dBm ♦ Low Current Consumption: 23mA Receive 20mA Transmit 9.5mA Oscillator ♦ 0.5µA Shutdown Mode ♦ Operates from Single +2.7V to +4.8V Supply _______________Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX2424EAI -40°C to +85°C 28 SSOP MAX2426EAI -40°C to +85°C 28 SSOP ___________________Pin Configuration TOP VIEW VCC 1 28 GND CAP1 2 27 GND RXOUT 3 26 GND GND 4 25 TANK RXIN 5 Wireless Networks VCC 6 MAX2424 MAX2426 24 TANK 23 VCC Spread-Spectrum Communications GND 7 Two-Way Paging GND 8 21 PREOUT TXOUT 9 20 PREGND Functional Diagram appears at end of data sheet. 22 VCC LNAGAIN 10 19 MOD VCC 11 18 DIV1 TXIN 12 17 VCOON TXIN 13 16 RXON CAP2 14 15 TXON SSOP ________________________________________________________________ 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 MAX2424/MAX2426 ________________General Description The MAX2424/MAX2426 highly integrated front-end ICs provide the lowest cost solution for cordless and ISMband radios operating in the 900MHz band. Both devices incorporate a receive image-reject mixer (to reduce filter cost) as well as a versatile transmit mixer. The devices operate from a +2.7V to +4.8V single power supply, allowing direct connection to a 3-cell battery stack. The receive path incorporates an adjustable-gain LNA and an image-reject downconverter with 35dB image suppression. These features yield excellent combined downconverter noise figure (4dB) and high linearity with an input third-order intercept point (IIP3) of up to +2dBm. The transmitter consists of a double-balanced mixer and a power amplifier (PA) predriver that produces up to 0dBm (in some applications serving as the final power stage). It can be used in a variety of configurations, including BPSK modulation, direct VCO modulation, and transmitter upconversion. For devices featuring transmit as well as receive image rejection, refer to the MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 data sheet. The MAX2424/MAX2426 have an on-chip local oscillator (LO), requiring only an external varactor-tuned LC tank for operation. The integrated divide-by-64/65 dual-modulus prescaler can also be set to a direct mode, in which it acts as an LO buffer amplifier. Four separate powerdown inputs can be used for system power management, including a 0.5µA shutdown mode. The MAX2424/MAX2426 come in a 28-pin SSOP package. MAX2424/MAX2426 900MHz Image-Reject Receiver with Transmit Mixer ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +5.5V TXIN, TXIN Differential Voltage ..............................................+2V Voltage on TXOUT......................................-0.3V to (VCC + 1.0V) Voltage on LNAGAIN, TXON, RXON, VCOON, DIV1, MOD, TXIN, TXIN............................-0.3V to (VCC + 0.3V) RXIN Input Power..............................................................10dBm TANK, TANK Input Power ...................................................2dBm Continuous Power Dissipation (TA = +70°C) SSOP (derate 9.50mW/°C above +70°C) ......................762mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VCC = +2.7V to +4.8V, no RF signals applied, LNAGAIN = Unconnected, VTXIN = V TXIN = 2.3V, VVCOON = 2.4V, VRXON = VTXON = VMOD = VDIV1 = 0.45V, PREGND = GND, TA = -40°C to +85°C. Typicals are at TA = +25°C, VCC = 3.3V, unless otherwise noted.) (Note 1) CONDITIONS PARAMETER Supply-Voltage Range Oscillator Supply Current MIN TYP 2.7 PREGND = unconnected Prescaler Supply Current (÷ 64/65 mode) (Note 2) MAX UNITS 4.8 V 9.5 14 mA 4.2 6 mA Prescaler Supply Current (buffer mode) (Note 3) VDIV1 = 2.4V 5.4 8.5 mA Receive Supply Current (Note 4) VRXON = 2.4V, PREGND = unconnected 23 36 mA Transmitter Supply Current (Note 5) VRXON = 0.45V, VTXON = 2.4V, PREGND = unconnected 20 32 mA Shutdown Supply Current VCOON = RXON = TXON TA = +25°C = MOD = DIV1 = GND TA = -40°C to +85°C Digital Input Voltage High RXON, TXON, DIV1, VCOON, MOD Digital Input Voltage Low RXON, TXON, DIV1, VCOON, MOD Digital Input Current Voltage on any one digital input = VCC or GND 0.5 10 2.4 µA V ±1 0.45 V ±10 µA ≥25°C guaranteed by production test,