Texas Instruments AMC1203BPSA

Overview

AMC1203BPSA 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, ±1% max gain error, and 3500V_PEAK isolation per VDE 0884-17 - enabling direct connection to motor drive shunt resistors with high CMRR and 15kV/µs CMTI.

For engineers reviewing the AMC1203BPSA datasheet, AMC1203BPSA pinout, AMC1203BPSA application, or AMC1203BPSA equivalent, this device serves as a critical signal-conditioning interface between analog current sense points and isolated digital processing stages in safety-rated motor control, UPS, and frequency inverter designs requiring stable DC accuracy and robust transient immunity.

Technical Context

The AMC1203BPSA implements a second-order switched-capacitor delta-sigma modulator with SiO₂ capacitive isolation barrier, delivering a synchronous 1-bit bitstream output referenced to its internally generated 10MHz clock (±2MHz tolerance). Its differential analog front-end exhibits 28kΩ dynamic input resistance and supports common-mode voltages from 0V to AVDD.

It operates across two galvanically separated domains: high-side analog section (AVDD/AGND) and low-side digital section (DVDD/DGND), both rated 4.5–5.5V. The isolation barrier provides certified basic insulation (2500V_RMS/1min UL1577, 3500V_PEAK VDE 0884-17) with 1.5pF input-to-output capacitance and >10¹²Ω insulation resistance at 25°C.

Key Specifications

Pinout & Package

SOP-8 surface-mount package (PSA), 5.27mm × 7.9mm body, gull-wing leads, 1.27mm pitch. Designed for automated assembly and thermal performance up to 105°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AMC1303M0510 and ISO224B, the AMC1203BPSA offers optimal balance of integration (internal clock), isolation robustness (15kV/µs), and digital-native interface - minimizing external components while maintaining compatibility with TI C2000 SDFM and Xilinx Zynq-based motor control platforms.

Availability

AMC1203BPSA 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 production.

Supply support for AMC1203BPSA 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 motor control ICs.

The AMC1203BPSA belongs to TI's precision isolated delta-sigma modulator product line, designed specifically for high-fidelity current sensing in industrial power conversion systems where galvanic isolation, DC accuracy, and transient immunity are non-negotiable.

FAQ

What is the exact isolation rating certified for the AMC1203BPSA?

The AMC1203BPSA is certified to 3500V_PEAK basic isolation per DIN EN IEC 60747-17 (VDE 0884-17) and 2500V_RMS for 1 minute per UL1577. These ratings apply to the PSA package and are verified across the full –40°C to +105°C operating temperature range. The AMC1203BPSA achieves this using a silicon-dioxide capacitive barrier with 8µm minimum DTI and >10¹²Ω insulation resistance at 25°C.

Does the AMC1203BPSA require an external clock source?

No, the AMC1203BPSA does not require an external clock source. It integrates a precision 10MHz internal clock generator, with output available on the CLKOUT pin. This eliminates the need for external crystals, oscillators, or clock distribution circuitry - reducing BOM cost, PCB area, and potential jitter sources. The internal clock operates from 8MHz to 12MHz across temperature and supply variations, and its output directly synchronizes the DOUT bitstream.

How does the AMC1203BPSA handle common-mode transients in motor drive applications?

The AMC1203BPSA delivers 15kV/µs minimum common-mode transient immunity (CMTI), validated per VDE 0884-17. This performance stems from its SiO₂ capacitive isolation barrier and differential input architecture, which rejects fast-rising dv/dt noise from IGBT switching. In practice, the AMC1203BPSA maintains valid bitstream output during 10kV/µs transients - preventing data corruption and false overcurrent faults in three-phase inverter leg current sensing.

What digital filtering is required to extract usable data from the AMC1203BPSA's DOUT pin?

The AMC1203BPSA outputs a 1-bit sigma-delta bitstream that must be processed by a digital low-pass decimation filter - typically a sinc3 filter with oversampling ratio (OSR) of 256. When implemented in hardware (e.g., TI C2000 SDFM or Xilinx FPGA logic), this yields 16-bit effective resolution, 87dB SNR, and 39kSPS output rate. The filter removes out-of-band quantization noise shifted to high frequencies by the modulator, converting the bitstream into calibrated integer values representing the input voltage.

Can the AMC1203BPSA be used with microcontrollers lacking dedicated sigma-delta filter modules?

Yes, the AMC1203BPSA can be used with general-purpose MCUs, but requires software-based sinc3 filtering or external FPGA/CPLD implementation. While TI C2000 and Sitara devices integrate hardware SDFM modules optimized for AMC1203BPSA timing, ARM Cortex-M or RISC-V MCUs can process the DOUT/CLKOUT signals using GPIO capture and fixed-point DSP routines - though this increases CPU load and may limit maximum achievable update rate compared to hardware-accelerated filtering.