DS1870 Rev 2 2/06 LDMOS RF Power-Amplifier Bias Controller General Description Features Two-Channel Solution for Programmable RF Bias The DS1870 is a dual-channel bias controller targeted Control toward class AB LDMOS RF power-amplifier applica- tions. It uses lookup tables (LUTs) to control 256-posi- The Potentiometers Position is Automatically tion potentiometers based on the amplifiers Updated to Compensate for the Ambient temperature and drain voltage or current (or other Temperature and the Drain Voltage or Current external monitored signal). With its internal temperature A Five-Channel, 13-Bit ADC Continuously sensor and multichannel A/D converter (ADC), the Monitors the Ambient Temperature, V , V , I CC D D1, DS1870 provides a cost-effective solution that improves and I D2 the amplifiers efficiency by using nonlinear compensa- Hi/Lo Alarms for Each ADC Channel can Trigger a tion schemes that are not possible with conventional Fault Output biasing solutions. Nonvolatile Memory for the Device Settings, Applications Lookup Tables, and 32-Bytes of User Memory 2 I C-Compatible Serial Interface with Up to Eight Cellular Base Stations Devices on the Same Serial Bus Medical Equipment Single 5V Power Supply Industrial Controls Small 16-Pin TSSOP Package Optical Transceivers -40C to +95C Operational Temperature Range Ordering Information PART TEMP RANGE PIN-PACKAGE 16 TSSOP DS1870E-010 -40C to +95C (173 mils) 16 TSSOP DS1870E-010+ -40C to +95C (173 mils) +Denotes lead-free package. Typical Operating Circuit appears at end of data sheet. Pin Configuration TOP VIEW 1 L V 16 1 CC 2 W H 15 1 COM 3 W SDA 14 2 4 L SCL 13 2 DS1870 5 I A 12 D1 2 6 I A 11 D2 1 7 V A 10 D 0 89GND FAULT TSSOP (173 mils) 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. EVALUATION KIT AVAILABLELDMOS RF Power-Amplifier Bias Controller ABSOLUTE MAXIMUM RATINGS Voltage Range on V , H , SDA, and SCL Pins Relative to Operating Temperature Range ...........................-40C to +95C CC COM Ground ...............................................................-0.5V to +6.0V EEPROM Programming Temperature Range .........0C to +70C Voltage Range on A , A , A , FAULT, V , I , I Relative to Storage Temperature Range .............................-55C to +125C 0 1 2 D D1 D2 Ground..................-0.5V to V + 0.5V, not to exceed +6.0V Soldering Temperature .......................................See IPC/JEDEC CC Voltage Range on L0, L1, W0, and W1 Relative to J-STD-020A Specification Ground.................-0.5V to H + 0.5V, not to exceed +6.0V COM 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. RECOMMENDED DC OPERATING CONDITIONS (T = -40C to +95C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 4.5 5.5 V CC Input Logic 1 0.7 x V + CC V V IH (SDA, SCL, A , A , A ) V 0.3 2 1 0 CC Input Logic 0 +0.3 x V -0.3 V IL (SDA, SCL, A , A , A ) V 2 1 0 CC H Voltage 4.5 5.5 V COM H COM L and W Voltage -0.3 V X X + 0.3 Wiper Current -1 +1 mA DC ELECTRICAL CHARACTERISTICS (V = +4.5 to 5.5V, T = -40C to +95C.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 2) 1 2 mA CC Input Leakage I -200 +200 nA LI V 3mA sink current 0.4 V Low-Level Output Voltage OL1 (SDA, FAULT) V 6mA sink current 0.6 V OL2 I/O Capacitance C 10 pF I/O Digital Power-On Reset V 1.0 2.2 V POD Analog Power-On Reset V 2.0 2.8 V POA 2 DS1870