SLAS972B November 2014  – March 2016 AMC7834

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics—DAC Specifications
    6. 6.6 Electrical Characteristics—ADC, Current and Temperature Sensor Specifications
    7. 6.7 Electrical Characteristics—General Specifications
    8. 6.8 Serial Interface Timing Requirements
    9. 6.9 Switching Characteristics—DAC Specifications
    10. 6.10Switching Characteristics—ADC, Current and Temperature Sensor Specifications
    11. 6.11Switching Characteristics—General Specifications
    12. 6.12Typical Characteristics
      1. 6.12.1Typical Characteristics: DAC
      2. 6.12.2Typical Characteristics: ADC
      3. 6.12.3Typical Characteristics: Current Sense
      4. 6.12.4Typical Characteristics: Temperature Sensor
      5. 6.12.5Typical Characteristics: Reference
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Digital-to-Analog Converters (DACs)
        1. 7.3.1.1DAC Configuration
          1. 7.3.1.1.1Bipolar DACs (DAC1, DAC2, DAC3, and DAC4)
          2. 7.3.1.1.2Auxiliary DACs (AUXDAC1, AUXDAC2, AUXDAC3, and AUXDAC4)
        2. 7.3.1.2DAC Register Structure
        3. 7.3.1.3DAC Clamp Operation
      2. 7.3.2Analog-to-Digital Converter (ADC)
        1. 7.3.2.1External Analog Inputs
        2. 7.3.2.2Internal Bipolar DAC Monitoring Inputs
        3. 7.3.2.3ADC Sequencing
      3. 7.3.3Temperature Sensors
        1. 7.3.3.1Internal Temperature Sensor
        2. 7.3.3.2Remote Temperature Sensors
      4. 7.3.4Current Sensors
      5. 7.3.5Drain Switch Control
      6. 7.3.6Programmable Out-of-Range Alarms
        1. 7.3.6.1ADC Internal Monitoring Input Out-of-Range Alarm
        2. 7.3.6.2Current-Sense Out-of-Range Alarm
        3. 7.3.6.3Temperature Sensors Out-of-Range Alarm
        4. 7.3.6.4Bipolar DACs High Alarm
        5. 7.3.6.5AVSS Detection Alarm
        6. 7.3.6.6AVDD Detection Alarm
        7. 7.3.6.7Hysteresis
        8. 7.3.6.8False-Alarm Protection
      7. 7.3.7Reference Specifications
        1. 7.3.7.1Internal Reference Operation
        2. 7.3.7.2External Reference Operation
      8. 7.3.8General Purpose I/Os
    4. 7.4Device Functional Modes
      1. 7.4.1Open-Loop Mode
      2. 7.4.2Closed-Loop Mode
    5. 7.5Programming
    6. 7.6Register Maps
      1. 7.6.1 Power Mode: Address 0x02
        1. 7.6.1.1Power Mode Register (address = 0x02) [reset = 0x000]
      2. 7.6.2 Device Identification: Address 0x04 through 0x0C
        1. 7.6.2.1Device ID Register (address = 0x04) [reset = 0x0C34]
        2. 7.6.2.2Version ID Register (address = 0x06) [reset = 0x0001]
        3. 7.6.2.3Vendor ID Register (address = 0x0C) [reset = 0x0451]
      3. 7.6.3 General Device Configuration: Address 0x10 through 0x16
        1. 7.6.3.1AMC Configuration 0 Register (address = 0x10) [reset = 0x0300]
        2. 7.6.3.2AMC Configuration 1 Register (address = 0x11) [reset = 0x036A]
        3. 7.6.3.3ADC MUX Register (address = 0x12) [reset = 0x0000]
        4. 7.6.3.4Closed Loop Settling Time Register (address = 0x14) [reset = 0x2222]
        5. 7.6.3.5DAC Sync Register (address = 0x15) [reset = 0x0000]
        6. 7.6.3.6DAC Range Register (address = 0x16) [reset = 0x0000]
      4. 7.6.4 Clamp and Alarm Configuration: Address 0x17 through 0x1B
        1. 7.6.4.1CLAMP Configuration Register (address = 0x17) [reset = 0x003F]
        2. 7.6.4.2SLEEP1 Configuration Register (address = 0x18) [reset = 0xFF00]
        3. 7.6.4.3SLEEP2 Configuration Register (address = 0x19) [reset = 0xFF00]
        4. 7.6.4.4ALARMOUT Clamp Register (address = 0x1A) [reset = 0x0000]
        5. 7.6.4.5ALARMOUT Configuration Register (address = 0x1B) [reset = 0x0000]
      5. 7.6.5 Conversion Trigger: Address 0x1C
        1. 7.6.5.1DAC and ADC Trigger Register (address = 0x1C) [reset = 0x0000]
      6. 7.6.6 Reset: Address 0x1D
        1. 7.6.6.1Software Reset Register (address = 0x1D) [reset = 0x0000]
      7. 7.6.7 Device Status: Address 0x1E and 0x1F
        1. 7.6.7.1Alarm Status Register (address = 0x1E) [reset = 0x0000]
        2. 7.6.7.2General Status Register (address = 0x1F) [reset = 0x0000]
      8. 7.6.8 ADC Data: Address 0x20 through 0x2F
        1. 7.6.8.1ADCn-Internal-Data Register (address = 0x20 to 0x23) [reset = 0x0000]
        2. 7.6.8.2ADCn-External-Data Register (address = 0x24 to 0x27) [reset = 0x0000]
        3. 7.6.8.3CSn-Data Register (address = 0x28 to 0x2B) [reset = 0x0000]
        4. 7.6.8.4LT-Data Register (address = 0x2D) [reset = 0x0000]
        5. 7.6.8.5RTn-Data Register (address = 0x2E to 0x2F) [reset = 0x0000]
      9. 7.6.9 DAC Data: Address 0x30 through 0x37
        1. 7.6.9.1DACn-Data Register (address = 0x30 to 0x33) [reset = 0x0000]
        2. 7.6.9.2AUXDACn-Data Register (address = 0x34 to 0x37) [reset = 0x0000]
      10. 7.6.10Closed-Loop Control: Address 0x38 through 0x3B
        1. 7.6.10.1ClosedLoopn Register (address = 0x38 to 0x3B) [reset = 0x0000]
      11. 7.6.11Alarm Threshold Configuration: Address 0x40 through 0x4F
        1. 7.6.11.1ADCINTn/CSn-Upper-Threshold Register (address = 0x40, 0x42, 0x44 and 0x46) [reset = 0x0FFF]
        2. 7.6.11.2ADCINTn/CSn-Lower-Threshold Register (address = 0x41, 0x43, 0x45 and 0x47) [reset = 0x0000]
        3. 7.6.11.3TS-Upper-Threshold Register (address = 0x48, 0x4A and 0x4C) [reset = 0x07FF]
        4. 7.6.11.4TS-Lower-Threshold Register (address = 0x49, 0x4B and 0x4D) [reset = 0x0800]
        5. 7.6.11.5DACnn-Upper-Threshold Register (address = 0x4E and 0x4F) [reset = 0x0FFF]
      12. 7.6.12Alarm Hysteresis Configuration: Address 0x50 and 0x56
        1. 7.6.12.1ADCINTn/CSn-Hysteresis Register (address = 0x50 to 0x53) [reset = 0x0008]
        2. 7.6.12.2LT-Hysteresis Register (address = 0x54) [reset = 0x0008]
        3. 7.6.12.3RTn-Hysteresis Register (address = 0x55 to 0x56) [reset = 0x0008]
      13. 7.6.13GPIO: Address 0x58
        1. 7.6.13.1GPIO Register (address = 0x58) [reset = 0x000F]
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. 8.2.2.1ADC Input Conditioning
        2. 8.2.2.2DAC Output Range Selection
        3. 8.2.2.3Temperature Sensing Applications
        4. 8.2.2.4Current Sensing Applications
      3. 8.2.3Application Performance Curve
    3. 8.3Initialization Set Up
      1. 8.3.1Initialization Procedure
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information

1 Features

  • 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

2 Applications

  • Communications Infrastructure:
    • Cellular Base Stations
    • Microwave Backhaul
    • Optical Networks
  • General-Purpose Monitor and Control
  • Data Acquisition Systems

3 Description

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.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
AMC7834VQFN (56)8.00 mm × 8.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.
AMC7834 alt_slas972.gif

4 Revision History

Changes from A Revision (April 2015) to B Revision

Changes from * Revision (November 2014) to A Revision

  • Release full version production data data sheet Go