Texas Instruments AMC1200BDUB

Overview

AMC1200BDUB from Texas Instruments is a fully-differential isolation amplifier with SiO₂ capacitive barrier, optimized for shunt-based current sensing in high-voltage motor-control systems. It delivers ±250-mV input range, 8× fixed gain (±0.5% accuracy), 108 dB CMRR at DC, 60 kHz minimum bandwidth, and 4250 V_PEAK certified galvanic isolation per UL1577 and VDE V 0884-10.

For engineers reviewing the AMC1200BDUB datasheet, AMC1200BDUB pinout, AMC1200BDUB application, or AMC1200BDUB equivalent, this device supports precision current measurement in isolated high-side power stages where low offset (1.5 mV max), low nonlinearity (0.075% max), and high CMTI (10 kV/µs min) are critical to system stability and torque ripple reduction.

Technical Context

The AMC1200BDUB employs a second-order delta-sigma modulator on the high-voltage side, digitizing the differential analog input and transmitting the bitstream across a silicon dioxide isolation barrier. Its internal 2.5-V reference and 10-MHz clock enable stable conversion without external timing components.

On the low-voltage side, a third-order active low-pass filter reconstructs the analog signal and applies fixed 8× gain. Output common-mode voltage auto-adjusts to either 3.3 V or 5 V supply (1.29 V or 2.55 V typical), enabling direct interface with downstream ADCs or controllers without level-shifting.

Key Specifications

Pinout & Package

AMC1200BDUB uses an 8-pin SOP (Small Outline Package) with gull-wing leads, body size 9.50 mm × 6.57 mm, rated for extended industrial temperature range (–40°C to +105°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolation amplifier applications.

Compared with AMC1301SDUB and ISO224BDWVR, the AMC1200BDUB provides the optimal balance of shunt-optimized input range, integrated reference, low power, and certified 4250-V_PEAK isolation-making it the most direct fit for cost- and space-constrained industrial motor drives.

Availability

AMC1200BDUB is available at Aetrix Electronics and suitable for motor control, green energy inverters, and uninterruptible power supplies requiring stable component supply, long-lifecycle assurance, and certified safety isolation.

Supply support for AMC1200BDUB 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 delivering analog and embedded processing solutions, with decades of expertise in isolation technology and industrial signal conditioning.

The AMC1200B product line targets high-reliability current sensing in industrial motor drives and renewable energy systems, emphasizing robust galvanic isolation, low drift, and seamless integration with shunt resistors and 3.3-V/5-V controllers.

FAQ

What is the isolation rating of the AMC1200BDUB and which standards does it meet?

The AMC1200BDUB is UL1577 and VDE V 0884-10 certified for 4250 V_PEAK galvanic isolation, with 1200 V_PEAK maximum working voltage and ≥10 kV/µs common-mode transient immunity. These ratings are validated per standardized test protocols including partial discharge <5 pC and 60-second withstand at VIOTM, making AMC1200BDUB suitable for reinforced insulation in IEC 61800-5-1 compliant drives.

Can the AMC1200BDUB operate with a 3.3-V low-side supply, and what is its output common-mode voltage in that configuration?

Yes, the AMC1200BDUB supports 2.7–3.6 V on VDD2 and delivers a typical output common-mode voltage of 1.29 V (range: 1.15–1.45 V) when operating at 3.3 V. This allows direct connection to 3.3-V SAR or sigma-delta ADCs without external level-shifting circuitry, preserving signal integrity and simplifying layout.

What is the maximum differential input voltage the AMC1200BDUB can handle before clipping occurs?

The AMC1200BDUB clips when the differential input voltage (VINP – VINN) exceeds ±320 mV. However, guaranteed linear operation with ≤0.075% nonlinearity is specified only within ±250 mV - the range optimized for standard shunt resistors. Exceeding ±250 mV degrades accuracy but does not damage the device if input current remains ≤10 mA.

How does the AMC1200BDUB achieve low offset drift, and what is its typical value over temperature?

The AMC1200BDUB achieves ±1.5 µV/K input offset thermal drift through laser-trimmed internal resistor networks and matched transistor pairs in its delta-sigma modulator front-end. Over –40°C to +105°C, total offset variation remains within ±1.5 mV (max), enabling stable current measurement without periodic recalibration in thermally demanding motor control environments.

Does the AMC1200BDUB require an external clock or reference voltage to operate?

No, the AMC1200BDUB integrates both a precision 2.5-V reference and a 10-MHz RC oscillator, eliminating the need for external timing or reference components. This reduces bill-of-materials cost, PCB area, and design complexity - a key advantage over alternatives like the AMC1301, which requires an external clock source.