MAX3520 DOCSIS 3.0 Upstream Amplifier General Description Features The MAX3520 is an integrated CATV upstream amplifier +5V Supply Voltage IC designed to exceed the DOCSIS 3.0 requirements. Ultra-Low 25mW Dissipation in Transmit-Disable The amplifier covers a 5MHz to 85MHz input frequency Mode range (275MHz, 3dB bandwidth), and is capable of trans- 63dB Gain Control Range in 1dB Steps mitting four QPSK modulated carriers, each at +58dBmV, -63dBc Harmonic Distortion at 64dBmV Output simultaneously within this range. Both input and output ports are differential, requiring that an external balun be Small 5mm x 5mm TQFN Package used at the output port. The gain is controlled in 1dB steps Low Burst On/Off Transient over a 63dB range using a SPI 3-wire interface. 275MHz, 3dB Bandwidth The MAX3520 operates from a single +5V supply. Four power codes are provided to allow maximum supply cur- rent to be reduced as determined by distortion require- ments. In addition, for each power code, supply current is automatically reduced as gain is reduced while maintaining distortion performance. For DOCSIS 3.0 applications, the MAX3520 draws 360mA at 33dB gain, dropping to 300mA at 31dB gain. The MAX3520 supply current drops to 5mA between bursts to minimize power dissipation in transmit- Ordering Information appears at end of data sheet. disable mode. Control logic levels are 3.3V CMOS. The MAX3520 is available in a 20-pin TQFN package, and operates over the extended industrial temperature Typical Application Circuit appears at end of data sheet. range (-40C to +85C). Applications DOCSIS 3.0 Cable Modems VOIP Modems Set-Top Boxes Functional Diagram N.C. N.C. N.C. V N.C. CC 20 19 18 17 16 GND 1 15 N.C. MAX3520 IN+ 2 14 OUT+ IN- 3 13 N.C. N.C.* 4 12 OUT- SERIAL INTERFACE 5 11 N.C.* GND 6 7 8 9 10 SCLK SDA CS TXEN V CC NOTE: N.C.* PINS MUST BE LEFT UNCONNECTED. 19-6015 Rev 1 5/12MAX3520 DOCSIS 3.0 Upstream Amplifier Absolute Maximum Ratings V to GND .........................................................-0.3V to +5.5V Operating Temperature Range ........................... -40C to +85C CC IN+, IN- ..................................................... -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C CC OUT+, OUT- ............................................. -0.3V to (V + 3.6V) Storage Temperature Range ............................ -65C to +165C CC TXEN, SDA, SCLK, CS ........................................-0.3V to +4.2V Lead Temperature (soldering, 10s) .................................+300C RF Input Power ..............................................................+10dBm Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A (derate 29mW/C above T = +70C) .......................2000mW A 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 = 0V, TXEN = high, T = -40C to +85C, unless otherwise speci- CC GND A fied. Typical values are at V = 5V, T = +25C.) (Note 1) 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) 360 385 Supply Current Transmit I mA CC Mode Gain code = 59, power code = 1 (29dB gain typ) 190 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 = 0V, TXEN = high, T = -40C to +85C, unless otherwise speci- CC GND A fied. Typical values are at V = 5V, T = +25C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Frequency Range f (Note 2) 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 3) 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 Maxim Integrated 2 www.maximintegrated.com