AD7293 Series
12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors
Manufacturer: Analog Devices
Catalog
12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors
Key Features
• 4 closed-loop power amplifier (PA) drain current controllers
• Built-in PA protection, sequencing, and alert features
• Compatible with both depletion mode and enhancement mode power amplifiers
• Highly integrated4 uncommitted 12-bit analog-to-digital converter (ADC) inputs±0.5 LSB typical integral nonlinearity (INL)Eight 12-bit voltage digital-to-analog converters (DACs)1.3 μs maximum settling4 high-side current sense amplifiers, ±0.1% gain error2 external temperature sensor inputs, ±1.1°C accuracyInternal temperature sensor, ±1.25°C accuracy2.5 V on-chip reference
• 4 uncommitted 12-bit analog-to-digital converter (ADC) inputs±0.5 LSB typical integral nonlinearity (INL)
• ±0.5 LSB typical integral nonlinearity (INL)
• Eight 12-bit voltage digital-to-analog converters (DACs)1.3 μs maximum settling
• 1.3 μs maximum settling
• 4 high-side current sense amplifiers, ±0.1% gain error
• 2 external temperature sensor inputs, ±1.1°C accuracy
• Internal temperature sensor, ±1.25°C accuracy
• 2.5 V on-chip reference
• Flexible monitoring and control rangesADC input ranges: 0 V to 1.25 V, 0 V to 2.5 V, and 0 V to 5 VBipolar DAC ranges: 0 V to +5 V, −4 V to +1 V, and −5 V to 0 VBipolar DAC reset and clamping relative to VCLAMPxvoltageUnipolar DAC ranges: 0 V to 5 V, 2.5 V to 7.5 V, and 5 V to 10 VCurrent sense gain: 6.25, 12.5, 25, 50, 100, and moreAdjustable closed-loop setpoint ramp time
• ADC input ranges: 0 V to 1.25 V, 0 V to 2.5 V, and 0 V to 5 V
• Bipolar DAC ranges: 0 V to +5 V, −4 V to +1 V, and −5 V to 0 V
• Bipolar DAC reset and clamping relative to VCLAMPxvoltage
• Unipolar DAC ranges: 0 V to 5 V, 2.5 V to 7.5 V, and 5 V to 10 V
• Current sense gain: 6.25, 12.5, 25, 50, 100, and more
• Adjustable closed-loop setpoint ramp time
• High-side voltage current sensing4 current sense inputs4 V to AVSS+ 60 V, ±200 mV input range
• 4 current sense inputs4 V to AVSS+ 60 V, ±200 mV input range
• 4 V to AVSS+ 60 V, ±200 mV input range
• Small package and flexible interfaceSerial port interface (SPI) with VDRIVE supporting 1.8 V, 3 V, and 5 V interfaces56-lead LFCSP
• Serial port interface (SPI) with VDRIVE supporting 1.8 V, 3 V, and 5 V interfaces
• 56-lead LFCSP
• Temperature range: −40°C to +125°C
Description
AI
The AD7293 is a PA drain current controller containing functionality for general-purpose monitoring and control of current, voltage, and temperature, integrated into a single chip solution with an SPI-compatible interface.The device features a 4-channel, 12-bit successive approximation register (SAR) ADC, eight 12-bit DACs (four bipolar and four unipolar with output ranges that can be configured to shut down under external pin control), a ±1.25°C accurate internal temperature sensor, and eight general-purpose input/output (GPIO) pins.The device also includes limit registers for alert functions and four high-side current sense amplifiers to measure current across external shunt resistors. These amplifiers can be optionally set to operate as part of four independent closed-loop drain current controllers.A high accuracy 2.5 V internal reference is provided to drive the DACs and the ADC. The 12-bit ADC monitors and digitizes the internal temperature sensor, and two inputs are included for the external diode temperature sensors.Product HighlightsFour independent closed-loop drain current controllers.Built-in monitoring, sequencing, and alert features.Compatible with both depletion mode and enhancement mode power amplifiers.ApplicationsGaN and GaAs power amplifier monitoring and controlsBase station power amplifiersGeneral-purpose system monitoring and controls
