MAX2371/MAX2373 19-2301 Rev 1 10/06 LNAs with Step Attenuator and VGA General Description Features The MAX2371/MAX2373 wideband low-noise amplifier Low Noise Figure (1.8dB typical) (LNA) ICs are designed for direct conversion receiver High Small-Signal Gain (15dB Nominal) (DCR) or very low intermediate frequency (VLIF) receiver applications. They contain single-channel, single-ended Wide Frequency Range of Operation LNAs with switchable attenuator and automatic gain con- (100MHz to 1GHz) trol (AGC) intended as a low-noise gain stage. These 20dB Step Attenuator devices provide high gain-control range (typically 60dB) at radio frequency (RF) with excellent noise and reverse 45dB AGC Range Excluding Step Attenuator isolation characteristics. 2.65V to 3.3V Single-Supply Operation The MAX2371/MAX2373 can work over the frequency range from 100MHz to 1GHz. In practice, only a narrow Shutdown Mode band is needed in each application, so different matching 3.5mA Supply Current, Adjustable Down to 2.5mA circuits can be applied. The devices are dynamically con- figured through the digital/analog control pins to select 40dB Reverse Isolation either maximum gain and low noise figure or power-saving mode. In addition, the MAX2371/MAX2373 feature high/low-current modes, high/low attenuation modes, lin- Ordering Information early controlled gain states, and shutdown mode. PIN- PKG PART TEMP RANGE PACKAGE CODE Applications MAX2371EGC -40C to +85C 12 QFN-EP* G1233-1 MAX2371ETC -40C to +85C 12 TQFN-EP* T1233-3 Direct Conversion Receiver (DCR) MAX2371ETC+ -40C to +85C 12 TQFN-EP* T1233+3 Very Low IF Receiver MAX2373EGC -40C to +85C 12 QFN-EP* G1233-1 MAX2373ETC -40C to +85C 12 TQFN-EP* T1233-3 MAX2373ETC+ -40C to +85C 12 TQFN-EP* T1233+3 *EP = Exposed pad. +Denotes lead-free package. Pin Configuration Functional Diagram TOP VIEW GND RF V RSET CC GND RF V RSET CC 12 11 10 AGC BYP LNA IN MAX2371 LNA V CC MAX2373 LNA IN 1 9 AGC BYP RF AGC LNA LNA OUT LNA E ATTENUATOR AMP LNA E 2 8 LNA V CC MAX2371 MAX2373 RX EN RX EN 3 7 LNA OUT EXPONENTIAL CONVERTER 45 6 RF ATTN AGC LNA I RF ATTN AGC LNA I QFN/TQFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLELNAs with Step Attenuator and VGA ABSOLUTE MAXIMUM RATINGS V to GND...........................................................-0.3V to +3.6V Operating Temperature Range ...........................-40C to +85C CC All Pins Excluding Grounds to Pin GND.....-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC LNA Input Power (RX EN = low) ........................................5dBm Storage Temperature Range .............................-65C to +160C Continuous Power Dissipation (T = +70C) Soldering Temperature (10s)...........................................+300C A 12-Pin QFN (derate 11.9mW/C above +70C) ...........952mW 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 (V = 2.775V, RX EN = high, R = 1.1k, V = V /2, T = -40C to +85C. Typical values are at T = +25C, unless other- CC SET AGC CC A A wise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 2.65 2.775 3.30 V CC RX EN = low, V = 3.3V 0.5 20 A CC Supply Current I LNA I = high, RF ATTN = low 3.5 5.5 mA CC LNA I = low 2.5 3.5 mA Digital Input Logic High V Pins LNA I, RF ATTN, RX EN 0.7 V V V IH CC CC Digital Input Logic Low V Pins LNA I, RF ATTN, RX EN 0 0.3 V V IL CC Logic Pin Impedance Logic pins RX EN, RF ATTN, LNA I 50 k AGC Pin Impedance Pins AGC 100 k AC ELECTRICAL CHARACTERISTICS (MAX2371/MAX2373 EV Kits, V = 2.65V to 3.3V, RX EN = high, R = 1.1k, T = -40C to +85C. Typical values are at V = CC SET A CC 2.775V for MAX2371 f = 150MHz, for MAX2373 f = 850MHz to 940MHz T = +25C, unless otherwise noted.) (Note 1) RF RF A PARAMETER CONDITIONS MIN TYP MAX UNITS LNA AND AGC AMP CHARACTERISTICS Low band (MAX2371) 136 150 174 Radio Frequency Range (Note 2) MHz High band (MAX2373) 850 900 940 MAX2371 -12 -9.5 LNA I = high RF ATTN = low MAX2373 -15 -9.5 Input Return Loss (S11) dB (Note 3) MAX2371 -14 -10 LNA I = high RF ATTN = high MAX2373 -10 -6.5 MAX2371 -40 -35 Reverse Isolation (S12) Over AGC range dB MAX2373 -42 -35 MAX2371 13 14.5 16 LNA I = high, T = A +25C, V = 2.775V CC MAX2373 14 15.5 17 Max Power Gain (Note 3) dB MAX2371 10.5 12 LNA I = low, T = A +25C, V = 2.775V CC MAX2373 10.5 13 Gain Variation Over Temperature T = -40C to +85C, V < 1.8V -2.0 2.0 dB A AGC 2 MAX2371/MAX2373