AMC7834 - Integrated Power-Amplifier Monitor and Control System

The AMC7834 device is a highly-integrated, low-power, analog monitoring and control solution for power-amplifier (PA) biasing capable of temperature, current and voltage supervision.

The device integrates a multi-channel, 12-bit analog-to-digital converter (ADC); eight, 12-bit digital-to-analog converters (DAC); four high-side current-sense amplifiers that can be optionally set to operate as part of four independent closed-loop drain-current controllers; an accurate on-chip temperature sensor and two remote temperature-sensor diode drivers; four configurable general-purpose I/O ports (GPIOs); and an accurate internal reference. The high level of integration significantly reduces component count and simplifies PA-biasing system designs.

The function integration and wide operating-temperature range of the device make it suitable as an all-in-one, low-cost, bias control-circuit for PAs found in multi-channel RF communication systems. The flexible DAC output ranges and wide common mode voltage current sensors allow the device to be used as a biasing solution for a large variety of transistor technologies such as LDMOS, GaAs, and GaN. The AMC7834 feature set is similarly beneficial in general-purpose monitor and control systems.

For applications that require a different channel-count, additional features, or converter resolutions, Texas Instruments offers a complete family of analog monitor and control (AMC) products. For more information, go to www.ti.com/amc.

• Eight Monotonic 12-bit DACs With Programmable
  Ranges
  • Four Bipolar DACs:
    –4 to 1 V, –5 to 0 V, and 0 to 5 V
  • Four Unipolar DACs:
    0 to 5 V, and 2.5 to 7.5 V
  • High Current Drive Capability: up to ±10 mA
  • Selectable Clamp Voltage
• Multi-Channel 12-bit SAR ADC
  • Four External Analog Inputs: 0 to 2.5 V Range
  • Four Internal Inputs for Bipolar DAC Monitoring
  • Programmable Out-of-Range Alarms
• Four High-Side Current-Sense Amplifiers
  • Common Mode Voltages: 4 to 60 V
  • Optional Closed-Loop Drain-Current Controller
    Operation
• Temperature Sensing Capabilities
  • Internal Temperature Sensor
  • Two Remote Temperature-Diode Drivers
• Internal 2.5 V Reference
• Four General-Purpose I/O Ports (GPIOs)
• Low-Power SPI-Compatible Serial Interface
  • 4-Wire Mode, 1.7 to 3.6 V Operation
• Operating Temperature Range: –40°C to +125°C
• Available in a 56-Pin VQFN Package