19-6381 Rev 0 6/12 EVALUATION KIT AVAILABLE MAX19794 10MHz to 500MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC General Description Benefits and Features The MAX19794 dual general-purpose analog voltage S Wide Band Coverage variable attenuator (VVA) is designed to interface RF Frequency Range from 10MHz to 500MHz with 50I systems operating in the 10MHz to 500MHz S High Linearity frequency range. This device includes a patented control Greater than +34.4dBm IIP3 over the Full circuit that provides 22.4dB of attenuation range (per Attenuation Range attenuator) with a typical linear control slope of 8dB/V. +21.8dBm Input P 1dB Both attenuators share a common analog control. S Integrates Two Analog Attenuators in One They can be cascaded together to yield 44.7dB of Monolithic Device total attenuation range with a typical combined linear S Two Convenient Control Options control slope of 16dB/V (5V operation). Alternatively, the Single Analog Voltage on-chip, 4-wire SPI-controlled 10-bit DAC can be used On-Chip, SPI-Controlled 10-Bit DAC to control both attenuators. In addition, a step-up/down feature allows user-programmable attenuator stepping S Step-Up/Down Pulse Command Inputs through command pulses without re-programming the S Flexible Attenuation Control Ranges SPI interface. 22.4dB (per Attenuator) 44.7dB (both Attenuators Cascaded) The MAX19794 is a monolithic device designed using one of Maxims proprietary SiGe BiCMOS processes. The S Linear dB/V Analog Control Response Curve part operates from a single +5V supply or alternatively Simplifies Automatic Leveling Control and Gain operates from a single +3.3V supply. It is available Trim Algorithms in a compact 36-pin TQFN package (6mm x 6mm x S Excellent Attenuation Flatness over Wide 0.8mm) with an exposed pad. Electrical performance Frequency Ranges and Attenuation Settings is guaranteed over the -40NC to +100NC extended S On-Chip Comparator (for Successive temperature range. Approximation Measurement of Attenuator Applications Control Voltage) S Low 13mA Supply Current Broadband System Applications, Including S Single +5V or 3.3V Supply Voltage Wireless Infrastructure Digital and Spread- Spectrum Communication Systems S Pin Similar with MAX19791, MAX19792, and MAX19793 WCDMA/LTE, TD-SCDMA/TD-LTE, WiMAX, cdma2000, GSM/EDGE and MMDS Base S Lead-Free Package Stations VSAT/Satellite Modems Military Systems Microwave Point to Point Systems Lineup Gain Trim WiMAX is a registered certification mark and regisitered service mark of WiMAX Forum. Temperature Compensation Circuits cdma2000 is a registered trademark of Telecommunications Automatic Level Control (ALC) Industry Association. Transmitter Gain Control Ordering Information appears at end of data sheet. Receiver Gain Control For related parts and recommended products to use with this part, General Test Equipment refer to www.maxim-ic.com/MAX19794.related. For pricing, delivery, and ordering information, please contact Maxim Direct 1 at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX19794 10MHz to 500MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC ABSOLUTE MAXIMUM RATINGS V .......................................................................-0.3V to +5.5V RF Input Power at IN A, IN B, OUT A, OUT B ...........+20dBm CC Continuous Power Dissipation (Note 1) ..............................2.8W REF IN ..............................-0.3V to Minimum (V + 0.3V, 3.6V) CC REF SEL DAC LOGIC,MODE, DWN, UP, Operating Case Temperature Range (Note 2) ...-40NC to +100NC , Maximum Junction Temperature .......................................150NC DIN, CLK, CS ................-0.3V to Minimum (V + 0.3V, 3.6V) CC Storage Temperature ....................................... -65NC to +150NC COMP OUT, DOUT ..............................................-0.3V to +3.6V Lead Temperature (soldering, 10s) ................................+300NC IN A, OUT A, IN B, OUT B .......................-0.3V to V + 0.3V CC Soldering Temperature (reflow) ......................................+260NC CTRL (except for test mode) .......................-0.3V to V + 0.3V CC Maximum CTRL Pin Load Current (CTRL configured as an output) ....................................0.3mA Note 1: Based on junction temperature T = T + (B x V x I ). This formula can be used when the temperature of the J C JC CC CC exposed pad is known while the device is soldered down to a PCB. See the Application Information section for details. The junction temperature must not exceed +150NC. Note 2: T is the temperature on the exposed pad of the package. T is the ambient temperature of the device and PCB. C A Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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. PACKAGE THERMAL CHARACTERISTICS TQFN Junction-to-Case Thermal Resistance (q ) Junction-to-Ambient Thermal Resistance (q ) JC JA (Notes 1, 4) .......................................................... +10C/W (Notes 3, 4) .......................................................... +36C/W Note 3: Junction temperature T = T + (B x V x I ). This formula can be used when the ambient temperature of the PCB is J A JA CC CC known. The junction temperature must not exceed +150NC. Note 4: 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. 3.3V DC ELECTRICAL CHARACTERISTICS (V = 3.15V to 3.45V, V = 1V, V = 0V, RDBK EN (D9, REG3) = Logic 0, no RF signals applied, all input and output CC CTRL DAC LOGIC ports terminated with 50I through DC blocks, T = -40NC to +100NC, unless otherwise noted. Typical values are at V = 3.3V, V C CC CTRL = 1.0V, V = 0V, RDBK EN (D9, REG3) = Logic 0, T = +25NC, unless otherwise noted.) (Note 5) DAC LOGIC C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.15 3.3 3.45 V CC Supply Current I 9.5 14 mA CC Control Voltage Range V 1.0 2.5 V CTRL CTRL Input Resistance R 1.0 MI CTRL Input CurrentLogic-High I -1.0 +1.0 FA IH Input Current Logic-Low I -1.0 +1.0 FA IL REF IN Voltage 1.4 V REF IN Input Resistance 1.0 MI DAC Number of Bits Monotonic 10 bits Input Voltage Logic-High V 2.0 V IH Input Voltage Logic-Low V 0.8 V IL RDBK EN (D9, REG3) = Logic 1, COMP OUT Logic-High 3.3 V R = 47k LOAD RDBK EN (D9, REG3) = Logic 1, COMP OUT Logic-Low 0 V R = 47k LOAD 2