Texas Instruments AMC1203DUBG4

Overview

AMC1203DUBG4 from Texas Instruments is a precision, basic-isolated delta-sigma modulator optimized for shunt-based current sensing in high-noise industrial power systems. It features ±280mV linear input range, 10MHz internal clock, 3500V_PEAK isolation per VDE 0884-17, and delivers 16-bit resolution with 87dB dynamic range when paired with a sinc3 filter at OSR 256.

For engineers reviewing the AMC1203DUBG4 datasheet, AMC1203DUBG4 pinout, AMC1203DUBG4 application, or AMC1203DUBG4 equivalent, this device is selected for high-accuracy isolated current measurement where galvanic separation between motor drive control logic and high-voltage power stages is required - especially in designs targeting IEC 61800-5-1 compliance and >15kV/µs CMTI immunity.

Technical Context

The AMC1203DUBG4 implements a second-order switched-capacitor delta-sigma modulator with SiO₂-based capacitive isolation barrier. Its differential analog front-end has 28kΩ dynamic input impedance and supports direct connection to low-impedance shunt resistors without external amplification.

Digital output (DOUT) is synchronous to the internally generated 10MHz clock (CLKOUT), enabling deterministic timing for downstream digital filtering. The modulator's noise-shaping architecture shifts quantization noise beyond the first Nyquist zone, allowing effective decimation via sinc3 filters to achieve 39kSPS data rate with 16-bit ENOB.

Key Specifications

Pinout & Package

SOP-8 gull-wing (DUB) package, 9.5mm × 10.4mm footprint, surface-mountable with standard reflow profile. High-side (AVDD, INP, INN, AGND) and low-side (DVDD, DOUT, CLKOUT, DGND) pins are physically segregated to minimize coupling across isolation barrier.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated delta-sigma modulator applications.

Compared with AMC1303M0510DWR and ISO224BDWVR, the AMC1203DUBG4 offers optimal balance of cost, integration (internal clock), and basic isolation for industrial motor drives - delivering deterministic 10MHz-synchronized bitstream without external timing components or analog-to-digital conversion overhead.

Availability

AMC1203DUBG4 is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, frequency inverters, and power conversion circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical production programs.

Supply support for AMC1203DUBG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision isolation and industrial signal chain solutions.

The AMC1203DUBG4 belongs to TI's precision isolated delta-sigma modulator product line, designed specifically for high-accuracy current sensing in noisy, high-voltage industrial environments - emphasizing robustness, ease of integration, and compliance with international safety standards.

FAQ

What is the maximum recommended operating temperature for the AMC1203DUBG4?

The AMC1203DUBG4 is characterized over an ambient temperature range of –40°C to +105°C. Its thermal design supports continuous operation at +105°C ambient when mounted on a standard FR-4 PCB with adequate copper pour, as confirmed by RθJA = 78°C/W for the DUB package and maximum junction temperature limit of 150°C.

Does the AMC1203DUBG4 require an external clock source?

No, the AMC1203DUBG4 does not require an external clock source. It integrates a 10MHz ±2MHz internal clock generator, and the CLKOUT pin provides this clock signal directly for synchronizing downstream digital filters. This eliminates timing skew and reduces system component count.

Can the AMC1203DUBG4 be used with shunt resistors below 1mΩ?

Yes, the AMC1203DUBG4 can interface with shunt resistors as low as 0.5mΩ when combined with appropriate layout practices (e.g., Kelvin sensing, guard rings). Its ±280mV linear input range and 28kΩ differential input impedance minimize loading error, and its ±320mV clipping threshold accommodates transient overloads without saturation.

What digital filter configuration is required to achieve 16-bit resolution with the AMC1203DUBG4?

To achieve 16-bit resolution and 87dB dynamic range, the AMC1203DUBG4 must be paired with a sinc3 digital low-pass filter operating at oversampling ratio (OSR) 256. This configuration yields a 39kSPS output data rate and is natively supported by TI C2000™ SDFM modules and common FPGA filter IP cores.

How does the AMC1203DUBG4 handle common-mode transients during IGBT switching?

The AMC1203DUBG4 handles common-mode transients with ≥15kV/µs immunity, enabled by its SiO₂ capacitive isolation barrier and differential input architecture. This ensures uninterrupted bitstream output during fast dv/dt events in 690V motor drives, preventing false triggering of overcurrent protection or control instability.