AD7293 12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors

Four independent closed-loop drain current controllers. Built-in monitoring, sequencing, and alert features. Compatible with both depletion mode and enhancement mode power amplifiers.

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.

Note that throughout this data sheet, multifunction pins, such as GPIO4/ALERT1, are referred to either by the entire pin name or by a single function of the pin, for example, ALERT1, when only that function is relevant.

Product Highlights

Applications

Features and Benefits

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 integrated

4 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 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

4 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 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 ranges

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 VCLAMPx voltage
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

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 VCLAMPx voltage

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

See data sheet for additional features

Analog to Digital Converters

A/D Converters

Communications

Wireless Infrastructure

Data Sheets

Document	note
AD7293: 12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors Data Sheet (Rev. A)	PDF 1.61 M

Application Notes

Document	note
AN-1361: AD7293 Closed-Loop for Power Amplifier Drain Current Control (Rev. A)	PDF 245.7 K

User Guides

Document	note
UG-817: Evaluating the AD7293 12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors (Rev. 0)	PDF 1.44 M

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7293BCPZ Production	56 ld LFCSP (8x8mm, 5.8mm exposed pad)	OTH 260	-40 to 125C	10.44	9.49	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVAL-AD7293SDZ	Evaluation Board	200	Y
EVAL-SDP-CB1Z	Controller Board	99	Y

AD7293: 12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors Data Sheet (Rev. A) ad7293

AN-1361: AD7293 Closed-Loop for Power Amplifier Drain Current Control (Rev. A) ad7293

UG-817: Evaluating the AD7293 12-Bit Power Amplifier Current Controller with ADC, DACs, Temperature and Current Sensors (Rev. 0) ad7293