MAX11008 19-4371 Rev 0 11/08 Dual RF LDMOS Bias Controller with Nonvolatile Memory General Description Features The MAX11008 controller biases RF LDMOS power On-Chip 4Kb EEPROM for Storing LDMOS Bias devices found in cellular base stations and other wire- Characteristics less infrastructure equipment. Each controller includes Integrated High-Side Current-Sense PGA with a high-side current-sense amplifier with programmable gains of 2, 10, and 25 to monitor the LDMOS drain cur- Gain of 2, 10, or 25 rent over a range of 20mA to 5A. The MAX11008 sup- 0.75% Accuracy for Sense Voltage Between ports up to two external diode-connected transistors to +75mV and +1250mV monitor the LDMOS temperatures while an internal tem- perature sensor measures the local die temperature. A Full-Scale Sense Voltage 12-bit successive-approximation register (SAR) analog- +100mV with a Gain of 25 to-digital converter (ADC) converts the analog signals +250mV with a Gain of 10 from the programmable-gain amplifiers (PGAs), exter- +1250mV with a Gain of 2 nal temperature sensors, internal temperature measure- Common-Mode Range, LDMOS Drain Voltage: ment, and two additional auxiliary inputs. The +5V to +32V MAX11008 automatically adjusts the LDMOS bias volt- ages by applying temperature, AIN, and/or drain cur- Adjustable Low-Noise 0 to AV Output Gate DD rent samples to data stored in lookup tables (LUTs). Bias Voltage Range The MAX11008 includes two gate-drive channels, each Fast Clamp to AGND for LDMOS Protection consisting of a 12-bit DAC to generate the positive gate voltage for biasing the LDMOS devices. Each gate- 12-Bit DAC Control of Gate with Temperature drive output supplies up to 2mA of gate current. The Internal Die Temperature Measurement gate-drive amplifier is current-limited to 25mA and features a fast clamp to AGND. 2-Channel External Temperature Measurement The MAX11008 contains 4Kb of on-chip, nonvolatile through Remote Diodes EEPROM organized as 256 bits x 16 bits to store LUTs Internal 12-Bit ADC Measurement for and register information. The device operates from Temperature, Current, and Voltage Monitoring either a 4-wire 16MHz SPI-/MICROWIRE-compati- 2 User-Selectable Serial Interface ble or an I C-compatible serial interface. 2 400kHz/1.7MHz/3.4MHz I C-Compatible Interface The MAX11008 operates from a +4.75V to +5.25V ana- 16MHz SPI-/MICROWIRE-Compatible Interface log supply with a typical supply current of 2mA, and a +2.7V to +5.25V digital supply with a typical supply of 3mA. The device is packaged in a 48-pin, 7mm x 7mm, thin QFN package and operates over the extended (-40C to +85C) temperature range. Applications Ordering Information Cellular Base Stations TEMP PART PIN-PACKAGE ERROR (C) Microwave Radio Links MAX11008BETM+ 48 TQFN-EP* 3 Feed-Forward Power Amps +Denotes a lead-free/RoHS-compliant package. Transmitters *EP = Exposed pad. Industrial Process Control Note: The device is specified over the -40C to +85C operating temperature range. SPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 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 AVAILABLEDual RF LDMOS Bias Controller with Nonvolatile Memory ABSOLUTE MAXIMUM RATINGS AV to AGND .........................................................-0.3V to +6V SDA/DIN and SCL/SCLK to DGND ..........................-0.3V to +6V DD DV to DGND.........................................................-0.3V to +6V Continuous Input Current (all terminals)...........................50mA DD AGND to DGND.....................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) A CS +, CS - to AGND .............................................-0.3V to +34V 48-Pin, 7mm x 7mm, TQFN (derate 27.8mW/C above CS + to CS - +70C).....................................................................2222.2mW If CS + > 6V .........................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C If CS + 6V .......................................................-0.3V to V Junction Temperature......................................................+150C CS - Analog Inputs/Outputs to AGND.................................................. Storage Temperature Range .............................-65C to +150C ...........................-0.3V to the lower of (AV + 0.3V) and +6V Lead Temperature (soldering, 10s) .................................+300C DD Digital Inputs/Outputs to DGND (except SDA/DIN and SCL/SCLK)......................................................................-0.3V to the lower of (DV + 0.3V) and +6V DD 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. ELECTRICAL CHARACTERISTICS (V = +32V, AV = DV = +5V 5%, external V = +2.5V, external V = +2.5V, C = 0.1F, C = 0.1nF, CS + DD DD REFADC REFDAC REF GATE V = V - V , T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) SENSE CS + CS - A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS HIGH-SIDE CURRENT-SENSE PGA Common-Mode Input Voltage V , CS1+ 532V Range V CS2+ Common-Mode Rejection Ratio CMRR 5V < V < 32V 110 dB CS + V < 100mV over the common-mode SENSE CS + Input Bias Current I 135 195 A CS + range V < 100mV over the common-mode SENSE CS - Input Bias Current I 1 A CS - range Gain = 25 0 100 Full-Scale Sense Voltage Range V Gain = 10 0 250 mV SENSE Gain = 2 0 1250 Gain = 25 75 100 Minimum Sense Voltage Range Gain = 10 75 250 mV for 0.75% V Accuracy SENSE Gain = 2 75 1250 Gain = 25 20 100 Minimum Sense Voltage Range Gain = 10 20 250 mV for 2.5% V Accuracy SENSE Gain = 2 20 1250 Total PGAOUT Voltage Error V = 75mV 0.1 0.75 % SENSE PGAOUT Capacitive Load C 50 pF PGAOUT PGAOUT Settling Time t (Note 1) < 25 s HSCS Settles to within 0.5% accuracy from Saturation Recovery Time < 45 s V = 3 x full scale SENSE 2 MAX11008