MAX3518 19-4390 Rev 0 2/09 DOCSIS 3.0 Upstream Amplifier General Description Features The MAX3518 is an integrated CATV upstream ampli- +5V Supply Voltage fier IC designed to meet the DOCSIS 3.0 requirements, Low Power: 1.25W at 31dB Gain, 64dBmV Output while disspating only 1.25W. The amplifier covers a Ultra-Low 25mW Dissipation in Transmit-Disable 5MHz to 85MHz input frequency range (275MHz, 3dB Mode bandwidth), and is capable of transmitting four QPSK modulated carriers, each at +58dBmV, simultaneously 63dB Gain Control Range in 1dB Steps within this range. Both input and output ports are dif- -60dBc Harmonic Distortion at 64dBmV Output ferential, requiring that an external balun be used at the output port. The gain is controlled in 1dB steps over a Small 5mm x 5mm Thin QFN Package 63dB range using a SPI 3-wire interface. Low Burst On/Off Transient The MAX3518 operates from a single +5V supply. Four 275MHz, 3dB Bandwidth power codes are provided to allow maximum supply current to be reduced as determined by distortion requirements. In addition, for each power code, sup- ply current is automatically reduced as gain is reduced while maintaining distortion performance. For DOCSIS Ordering Information 3.0 applications, the MAX3518 draws 300mA at 33dB PART TEMP RANGE PIN PACKAGE gain, dropping to 250mA at 31dB gain. The MAX3518 supply current drops to 5mA between bursts to minimize MAX3518ETP+ -40C to +85C 20 TQFN-EP* power dissipation in transmit-disable mode. Control +Denotes a lead(Pb)-free/RoHS-compliant package. logic levels are 3.3V CMOS. *EP = Exposed pad. The MAX3518 is available in a 20-pin thin QFN pack- age, and operates over the extended industrial tem- perature range (-40C to +85C). Applications DOCSIS 3.0 Cable Modems Typical Application Circuit appears at end of data sheet. VOIP Modems Set-Top Boxes SPI is a trademark of Motorola, Inc. Pin Configuration/Functional Diagram N.C. N.C. N.C. V N.C. CC 20 19 18 17 16 GND 1 15 N.C. MAX3518 IN+ 2 14 OUT+ IN- 3 13 N.C. N.C.* 4 12 OUT- SERIAL INTERFACE GND 5 11 N.C.* 6 7 8 9 10 NOTE: N.C.* PINS MUST BE LEFT UNCONNECTED. SCLK SDA CS TXEN V CC 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. EVALUATION KIT AVAILABLEDOCSIS 3.0 Upstream Amplifier ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +5.5V Continuous Power Dissipation (T = +70C) (Note 1) CC A IN+, IN- ...................................................... -0.3V to (V + 0.3V) CC (derate 29mW/C above T = +70C) ......................2000mW A OUT+, OUT- ............................................... -0.3V to (V + 3.6V) Operating Temperature Range ......................... -40C to +85C CC TXEN, SDA, SCLK, CS .........................................-0.3V to +4.2V Junction Temperature ......................................................+150C RF Input Power ...............................................................+10dBm Storage Temperature Range ........................... -65C to +165C Lead Temperature (soldering, 10s) .................................+300C Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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. CAUTION ESD SENSITIVE DEVICE DC ELECTRICAL CHARACTERISTICS (Typical Application Circuit as shown, V = 4.75V to 5.25V, V = 0, TXEN = high, T = -40C to +85C, unless otherwise speci- CC GND A fied. Typical values are at V = 5V, T = +25C.) (Note 2) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 4.75 5.25 V CC Gain code = 63, power code = 3 (33dB gain typ) 290 315 Supply Current Transmit Mode I mA CC Gain code = 59, power code = 1 (29dB gain typ) 160 Supply Current Transmit I TXEN = low 5 6.5 mA CC Disable Mode Input High Voltage V 2.0 3.6 V INH Input Low Voltage V 0.7 V INL Input High Current I 10 A BIASH Input Low Current I -10 A BIASH AC ELECTRICAL CHARACTERISTICS (Typical Application Circuit as shown, V = 4.75V to 5.25V, V = 0, TXEN = high, T = -40C to +85C, unless otherwise speci- CC GND A fied. Typical values are at V = 5V, T = +25C.) (Note 2) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Frequency Range f (Note 3) 5 85 MHz IN Gain code = 63 32 33 34 Gain code = 53 22 23 24 Voltage Gain, Z = 200, IN Gain code = 43 12 13 14 Z = 75, OUT A Gain code = 33 2 3 4 dB V Power Code = 3 Gain code = 23 -8 -7 -6 (Note 4) Gain code = 13 -18 -17 -16 Gain code = 03 -28 -27 -26 Voltage Gain Variation with 0.1 dB Power Code, Any Gain Code Voltage gain = -28dB to +33dB, f = 5MHz to IN Gain Rolloff -0.3 dB 85MHz Voltage gain = -28dB to +33dB, f = 5MHz to IN Gain Step Size 0.7 1.0 1.3 dB 85MHz 2 MAX3518