Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface


Product details


Input range (Vp-p) 250mV Interface type CMOS, Serial Sample rate (Max) (MSPS) 20 Rating Catalog Isolation (kV peak) 7 CMTI (Min) (kV/µs) 15 Number of input channels 1 Architecture Delta-Sigma SNR (dB) 85 Operating temperature range (C) -40 to 125 INL (Max) (+/-LSB) 4 Power consumption (Typ) (mW) 58.9 open-in-new Find other Isolated ADCs

Package | Pins | Size

SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Isolated ADCs


  • Pin-compatible family optimized for shunt-resistor-based current measurements:
    • ±50-mV or ±250-mV input voltage ranges
    • CMOS or LVDS digital interface options
  • Excellent DC performance supporting high-precision sensing on system level:
    • Offset error: ±50 µV or ±100 µV (max)
    • Offset drift: 1.3 µV/°C (max)
    • Gain error: ±0.2% or ±0.3% (max)
    • Gain drift: ±40 ppm/°C (max)
  • Safety-related certifications:
    • 7000-VPK reinforced isolation per
      DIN VDE V 0884-11: 2017-01
    • 5000-VRMS isolation for 1 minute per UL1577
    • CAN/CSA no. 5A-component acceptance service notice and IEC 62368-1 end equipment standard
  • Transient immunity: 15 kV/µs (min)
  • High electromagnetic field immunity
    (see application note SLLA181A)
  • External 5-MHz to 20-MHz clock input for
    easier system-level synchronization
  • On-chip 18-V LDO regulator
  • Fully specified over the extended industrial temperature range

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The AMC1304 is a precision, delta-sigma (ΔΣ) modulator with the output separated from the input circuitry by a capacitive double isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide reinforced isolation of up to 7000 VPEAK according to the DIN VDE V 0884-11, UL1577 and CSA standards. Used in conjunction with isolated power supplies, the device prevents noise currents on a high common-mode voltage line from entering the local system ground and interfering with or damaging low voltage circuitry.

The input of the AMC1304 is optimized for direct connection to shunt resistors or other low voltage-level signal sources. The unique low input voltage range of the ±50-mV device allows significant reduction of the power dissipation through the shunt while supporting excellent ac and dc performance. By using an appropriate digital filter (that is, as integrated on the TMS320F2807x or TMS320F2837x families) to decimate the bit stream, the device can achieve 16 bits of resolution with a dynamic range of 81 dB (13.2 ENOB) at a data rate of 78 kSPS.

On the high-side, the modulator is supplied by an integrated low-dropout (LDO) regulator that allows an unregulated input voltage between 4 V and 18 V (LDOIN). The isolated digital interface operates from a 3.3-V or 5-V power supply (DVDD).

The AMC1304 is available in a wide-body SOIC-16 (DW) package and is specified from –40°C to +125°C.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


The AMC1304M25 is an isolated single-channel delta-sigma (ΔΣ) modulator used in high-resolution measurement applications including current monitoring, industrial process control and motor positioning systems. The AMC1304M25EVM is a small form factor board containing all the necessary components to (...)

  • 2mm, 2-terminal screw connectors to provide easy access to the analog inputs of the modulator
  •  2mm, 2-terminal screw connectors to provide easy access to the modulator digital output (DATA) and modulator clock input (CLKIN)
  •  Optional isolated power to the AMC1304M25 analog voltage supply input (...)

TMDSCNCD28379D is an HSEC180 controlCARD based evaluation and development tool for the F2837xD,  F2837xS, and F2807x series in the TI MCU. controlCARDs are ideal to use for initial evaluation and system prototyping. controlCARDs are complete board-level modules that utilize one of two standard (...)


Hardware Features

  • TMDSCNCD28379D: TMS320F28379D HSEC180 based controlCARD
    • Isolated XDS100v2 USB-to-JTAG Debug Probe enables real-time in-system programming and debugging
  • Standard 180-pin HSEC interface
  • Analog I/O, digital I/O and JTAG signals at card interface
  • USB Host connector
  • SDCard Slot
  • Hardware Files (...)
This reference design implements single phase inverter (DC-AC) control using the C2000™ F2837xD and F28004x microcontrollers. Design supports two modes of operation for the inverter. First is voltage source mode using an output LC filter, this control mode is typically used in Uninterrupted (...)
  • powerSUITE supported Voltage Source Inverter and Grid Connected Inverter Design
  • Peak 98% efficiency in Voltage Source Mode and <4% THD in case of non linear loads
  • Input 380V DC, Output 220Vrms 50Hz or 110Vrms 60Hz and 600VA Max
  • Hardware Files are in DigitalPower SDK at solutions\tidm_hv_1ph_dcac

The DesignDRIVE Development Kit (IDDK) hardware offers an integrated servo drive design with full power stage to drive a high voltage three-phase motor and eases the evaluation of a range of position feedback, current sensing and control topologies.

The sensing peripherals on the C2000™ MCU (...)
  • Supports the DesignDRIVE fast current loop
  • Supports the DesignDRIVE position manager technology - EnDat22, BiSS-C, Tamagawa T-format, SIN/COS, resolver and incremental encoders
  • EtherCAT™ slave stack solution with TMDSCNCD28388D or TMDSECATCNCD379D controlCARD upgrade as well as expansion support (...)

Design tools & simulation

SLAM225A.ZIP (15 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

Reference designs

Distributed multi-axis servo drive over fast serial interface (FSI) reference design
TIDM-02006 This design presents an example distributed multi-axis servo drive over Fast Serial Interface (FSI) using C2000™ real-time controllers. Multi-axis servo drives are used in many applications such as factory automation and robots. The cost per axis, performance and ease of use are always high (...)
document-generic Schematic
Design files
Single-Phase Inverter Reference Design With Voltage Source and Grid Connected Modes
TIDM-HV-1PH-DCAC This reference design implements single-phase inverter (DC-AC) control using the C2000™ F2837xD and F28004x microcontrollers. Design supports two modes of operation for the inverter. First is the voltage source mode using an output LC filter. This control mode is typically used in (...)
document-generic Schematic
Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives
TIDA-00171 This evaluation kit and reference design implements the AMC130x reinforced isolated delta-sigma modulators along with integrated Sinc filters in the C2000™ TMS320F28377D Delfino™ microcontroller. The design provides an ability to evaluate the  performance of these measurements: three motor (...)
document-generic Schematic
Isolated, Shunt-Based Current Sensing Reference Design
TIPD165 This Verified TI Design implements an isolated current sensing data acqusition solution based on the AMC1304M25 isolated delta-sigma (ΔΣ) modulator and a TMS320F28377D microcontroller.  This circuit was designed for shunt-based current measurement applications which require excellent galvanic (...)
document-generic Schematic
Isolated delta-sigma modulator based AC/DC voltage and current measurement module reference design
TIDA-00080 This isolated shunt based current measurement unit enables high accuracy current measurement without the use of Current Transformers (CT). The isolation is achieved through the use of AMC1304 that incorporates both high voltage isolation as well as the Delta-Sigma Modulator. This solution eliminates (...)
document-generic Schematic
Multi-phase Energy Measurement with Isolated Shunt Sensors Reference Design
TIDA-00601 The TIDA-00601 design implements a Class 0.5% three-phase energy measurement system with isolated shunt sensors.  The isolation is achieved through the use of isolated delta-sigma modulators that have output circuitry capacitively isolated from input circuitry.  An energy measurement SoC (...)
document-generic Schematic
Extended Current and Voltage Measurement Using Shunts for Protection Relays Reference Design
TIDA-00738 The TIDA-00738 TI design demonstrates a unique approach for extending the current measurement range using a single shunt and voltage measurement using AMC1304Mx5 Isolated Delta-Sigma (ΔΣ) modulator. With careful selection of a low value shunt resistor that minimizes power dissipation, a (...)
document-generic Schematic
Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives Using AM437x
TIDA-00209 This reference design uses the AMC130x reinforced isolated delta-sigma modulators along with AM437x Sitara™ ARM® Cortex® -A9 Processor, which implements Sinc filters on PRU-ICSS. The design provides an ability to evaluate the performance of these measurements: three motor currents, three (...)
document-generic Schematic

CAD/CAE symbols

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SOIC (DW) 16 View options

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