MAX9989/MAX9990 19-2486 Rev 0 7/02 +14dBm to +20dBm LO Buffers with 1dB Variation General Description Features The MAX9989 and MAX9990 LO buffers provide the high 1dB Output Power Variation output (+14dBm to +20dBm) necessary to drive the LO +14dBm to +20dBm Adjustable Output Power inputs of high-linearity passive mixers, while offering 40dB reverse isolation to prevent LO pulling. The MAX9989 is 40dB Reverse Isolation internally matched for the cellular/GSM bands, and the Better Than 35dB Main Driver Output to PLL Amp MAX9990 is matched for the DCS/PCS/UMTS bands. Output Isolation The Typical Application Circuit provides a nominal +17dBm output power with 1dB variation over supply, Low Output Noise: -170dBc/Hz at +17dBm temperature, and input power. With two optional resis- 110mA Supply Current at +17dBm tors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 35dB ESD Protection main driver output to PLL amp output isolation. Each Isolated PLL Output (+3dBm) device is offered in a 5mm 5mm 20-pin thin QFN package with exposed paddle. Applications Ordering Information Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drives TEMP PIN- FREQUENCY PART RANGE PACKAGE RANGE (MHz) Coherent Receivers 20 Thin ISM Wireless LAN MAX9989ETP -40C to +85C 700 to 1100 QFN-EP* Wireless Local Loop MAX9990ETP -40C to +85C 20 QFN-EP* 1500 to 2200 Local Multipoint Distribution Service *EP = Exposed paddle. Point-to-Point Systems Typical Application Circuit/Pin Configuration appears at end of data sheet. Typical Operating Circuit and Block Diagram PLL BUFFER MAX9989 OUTPLL TO PLL MAX9990 RF INPUT (+3dBm) PRESCALER OUTPUT AMP IN OUTLO IF OUTPUT (+7dBm) (+17dBm) INPUT AMP RF LO BIAS BIASIN BIASOUT BIAS CONTROL NETWORK 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.+14dBm to +20dBm LO Buffers with 1dB Variation ABSOLUTE MAXIMUM RATINGS VCC1, VCC2, VCC3, VCCREF to GND .................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) A IN to GND...................................................-0.3V to (V + 0.3V) 20-Pin Thin QFN (derate 21mW/C above +70C) ....1667mW CC OUTLO, OUTPLL to GND...........................-0.3V to (V + 0.3V) .................................................................................+48C/W CC JA REF to GND ......................................................Source/Sink 5mA Junction Temperature......................................................+150C INBIAS, OUTBIAS to GND...................................-0.3V to +0.75V Operating Temperature Range ...........................-40C to +85C PLLBIAS ......................................................................Sink 25mA Storage Temperature Range .............................-65C to +150C RF Input Power...............................................................+20dBm Lead Temperature (soldering, 10s) .................................+300C 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 CHARACTERISTICSMAX9989 (Typical Application Circuit, V = 4.75V to 5.25V, input and outputs terminated in 50 , T = -40C to +85C. Typical specifications CC A are for V = 5.0V and T = +25C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 4.75 5.00 5.25 V CC Low power setting 77 (see Table 1 for resistor values) Nominal power setting Supply Current I 94 105 116 mA CC (R2R5 not installed) (Note 2) High power setting 146 (see Table 1 for resistor values) DC ELECTRICAL CHARACTERISTICSMAX9990 (Typical Application Circuit, V = 4.75V to 5.25V, input and outputs terminated in 50 , T = -40C to +85C. Typical specifications CC A are for V = 5.0V and T = +25C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 4.75 5.00 5.25 V CC Low power setting 87 (see Table 1 for resistor values) Nominal power setting Supply Current I 98 111 122 mA CC (R2R5 not installed) (Note 2) High power setting 154 (see Table 1 for resistor values) 2 MAX9989/MAX9990