Texas Instruments AMC1203DW

Overview

AMC1203 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, ±1mV max offset error, ±2% max gain error, and 3500V_PEAK isolation per VDE 0884-17 - enabling direct connection to motor-phase shunt resistors in inverters and UPS systems.

For engineers reviewing the AMC1203 datasheet, AMC1203 pinout, AMC1203 application, or AMC1203 equivalent, this page delivers verified technical context, SOIC-16 (DW) package mapping, real-world timing and accuracy specs, and validated alternative options for isolated current measurement designs requiring 16-bit effective resolution at 39kSPS with sinc3 filtering.

Technical Context

The AMC1203 implements a second-order switched-capacitor delta-sigma modulator with silicon-dioxide capacitive isolation barrier, delivering a 1-bit bitstream output synchronized to its internally generated 10MHz clock (±2MHz tolerance). Its differential analog front-end has 28kΩ dynamic input impedance and supports common-mode voltages from 0V to AVDD.

It achieves 16-bit resolution and 87dB dynamic range when paired with a sinc3 digital filter at OSR=256, producing a 39kSPS data rate. The isolation barrier provides 15kV/µs CMTI and meets both UL1577 (2500V_RMS/1min) and VDE 0884-17 (3500V_PEAK basic) safety standards.

Key Specifications

Pinout & Package

AMC1203-DW is housed in a 16-pin SOIC package (10.3mm × 10.3mm), featuring galvanically isolated high-side (AVDD, INP, INN, AGND) and low-side (DVDD, DOUT, CLKOUT, DGND) terminals, plus 8 NC pins for mechanical stability and creepage enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AMC1203, AMC1303M0510 offers superior transient immunity but requires clock management overhead, while ISO224 provides analog output flexibility at the cost of resolution and noise performance - making AMC1203 optimal for cost-sensitive, sinc-filter-based motor control with proven 16-bit ENOB at 39kSPS.

Availability

AMC1203 is available at Aetrix Electronics and suitable for industrial motor drives, frequency inverters, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical embedded systems.

Supply support for AMC1203 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 and embedded processing technologies, with decades of expertise in precision isolation and signal chain solutions.

The AMC1203 belongs to TI's precision isolated delta-sigma modulator product line, engineered specifically for high-accuracy current sensing in noisy industrial power electronics - emphasizing low offset drift, robust CMTI, and seamless integration with C2000 microcontrollers.

FAQ

What is the maximum recommended operating temperature for the AMC1203?

The AMC1203 is fully specified from –40°C to +105°C ambient temperature. All key parameters - including offset error (±1mV max), gain error (±2% max), and CMTI (15kV/µs min) - are guaranteed across this full industrial range. Thermal resistance RθJA for the DW package is 104°C/W, allowing safe operation at full load within this envelope when PCB layout follows TI's recommended copper pour guidelines.

Does the AMC1203 require an external clock source?

No, the AMC1203 does not require an external clock source. It integrates a 10MHz ±2MHz internal clock generator, and the CLKOUT pin provides this clock directly for synchronization with downstream digital filters (e.g., sinc3 in C2000 MCUs). This eliminates timing jitter from external oscillators and reduces system component count - a key advantage over alternatives like ISO224 or AMC1303 variants that lack internal clocks.

How does the AMC1203 achieve 16-bit resolution?

The AMC1203 achieves 16-bit effective resolution (ENOB) through delta-sigma modulation combined with external digital filtering - specifically a sinc3 filter at oversampling ratio (OSR) = 256. This configuration yields 39kSPS output data rate and 87dB dynamic range. The modulator itself outputs a 1-bit bitstream; resolution enhancement occurs entirely in the digital domain, making it dependent on proper filter implementation in the host processor or FPGA.

What isolation certifications apply to the AMC1203?

The AMC1203 is certified to DIN EN IEC 60747-17 (VDE 0884-17) for 3500V_PEAK basic isolation and UL1577 for 2500V_RMS/1 minute withstand voltage. These certifications validate its use in industrial equipment requiring functional isolation up to 690VAC mains. Certificate number 40047657 (VDE) and UL file E181974 confirm compliance - no additional system-level testing is needed for these ratings.

Can the AMC1203 be used with shunt resistors outside the ±280mV range?

The AMC1203's linear input range is strictly ±280mV (VFSR); operation beyond this causes clipping and nonlinearity. While absolute maximum input is ±320mV, sustained use above ±280mV invalidates accuracy specs. For shunts generating >280mV, external attenuation or gain scaling is required - but doing so degrades SNR and introduces matching errors. Optimal practice is selecting a shunt yielding ≤280mV at peak current, preserving the AMC1203's ±1mV offset and 87dB dynamic range.