Features: ` Two-Channel Solution for Programmable RF Bias Control
` The Potentiometer's Position is Automatically Updated to Compensate for the Ambient Temperature and the Drain Voltage or Current
` A Five-Channel, 13-Bit ADC Continuously Monitors the Ambient Temperature, VCC, VD, ID1,and ID2
` Hi/Lo Alarms for Each ADC Channel can Trigger aFault Output
` Nonvolatile Memory for the Device Settings,Lookup Tables, and 32-Bytes of User Memory
` I2C™-Compatible Serial Interface with Up to EightDevices on the Same Serial Bus
` Single 5V Power Supply
` Small 16-Pin TSSOP Package
` -40°C to +95°C Operational Temperature RangeApplication· Cellular Base Stations
· Medical Equipment
· Industrial Controls
· Optical TransceiversPinout
SpecificationsVoltage Range on VCC, HCOM, SDA, and SCL Pins Relative to
Ground .................................................................-0.5V to +6.0V
Voltage Range on A0, A1, A2, FAULT, VD, ID1, ID2 Relative to
Ground. ......................-0.5V to VCC + 0.5V, not to exceed +6.0V
Voltage Range on L0, L1, W0, and W1 Relative to
Ground.....................-0.5V to HCOM + 0.5V, not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +95°C
EEPROM Programming Temperature Range ...........0°C to +70°C
Storage Temperature Range ............................-55°C to +125°C
Soldering Temperature .................................... ...See IPC/JEDEC
J-STD-020A Specification
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.
DescriptionThe DS1870 is a dual-channel bias controller targeted toward class AB LDMOS RF power-amplifier applications. It uses lookup tables (LUTs) to control 256-position potentiometers based on the amplifier's temperature and drain voltage or current (or other external monitored signal). With its internal temperature sensor and multichannel A/D converter (ADC), the DS1870 provides a cost-effective solution that improves the amplifier's efficiency by using nonlinear compensation schemes that are not possible with conventional biasing solutions.
DS1870 Data Sheet
