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Texas Instruments AMC1203BDUB
- Part No.:
- AMC1203BDUB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SMD, Gull Wing
- Datasheet:
-
AMC1203BDUB.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
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Product details
Overview
AMC1203BDUB 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 3500VPEAK basic isolation per VDE 0884-17 - enabling direct connection to motor-phase shunt resistors in inverters and UPS.
For engineers reviewing the AMC1203BDUB datasheet, AMC1203BDUB pinout, AMC1203BDUB application, or AMC1203BDUB equivalent, this device delivers galvanically isolated 1-bit bitstream output synchronized to an on-chip clock, supporting sinc3 filtering for 16-bit resolution at 39kSPS - critical for real-time current feedback in safety-compliant motor control and power conversion designs.
Technical Context
The AMC1203BDUB implements a second-order switched-capacitor delta-sigma modulator with SiO₂ capacitive isolation barrier, providing inherent immunity to magnetic interference and 15kV/µs common-mode transient immunity. Its differential analog front-end has 28kΩ dynamic input impedance and supports ±320mV clipping voltage while maintaining linearity over ±280mV full-scale range.
Digital output (DOUT) and clock (CLKOUT) are referenced to separate low-side domains (DVDD/DGND), while analog inputs (INP/INN) and supply (AVDD/AGND) reside on the high-side domain. The modulator's 1-bit bitstream requires external digital decimation - typically via MCU-integrated SDFM or FPGA-based sinc3 filter with OSR=256 - to achieve 87dB SNR and 16-bit effective resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Range | ±280mV linear differential range - matches typical shunt resistor voltage drop at rated current, eliminating external scaling. |
| Isolation Rating | 3500VPEAK basic isolation (VDE 0884-17) - enables safe interfacing between high-voltage power stages and low-voltage control logic. |
| Internal Clock | 10MHz ±2MHz - eliminates need for external oscillator; CLKOUT provides synchronous timing reference for downstream filter sampling. |
| Offset Error | ±1mV max - ensures <100ppm full-scale error at ±280mV range, critical for accurate zero-current detection in bidirectional drives. |
| Gain Error | ±1% max (AMC1203B variant) - reduces calibration burden in production test; drift limited to ±20ppm/°C over –40°C to +105°C. |
| CM Transient Immunity | 15kV/µs min - sustains reliable operation during fast-switching IGBT events in 600V+ inverters without data corruption. |
| Supply Range | 4.5V–5.5V on both AVDD and DVDD - supports standard 5V rail design with margin for ripple and dropout. |
Pinout & Package
AMC1203BDUB is housed in an SOP-8 gull-wing (DUB) package measuring 9.5mm × 10.4mm, with 1.27mm lead pitch and creepage/clearance ≥7mm per VDE/UL standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AVDD | High-side power | Analog-domain supply (4.5–5.5V); must be decoupled near pin to minimize noise coupling into modulator core. |
| 2 INP | Analog input | Noninverting differential input; connects directly to shunt resistor high side - sensitive to layout parasitics. |
| 3 INN | Analog input | Inverting differential input; connects to shunt resistor low side or system ground - defines common-mode reference. |
| 4 AGND | High-side ground | Analog ground return for AVDD and inputs; must be isolated from DGND by physical separation and split planes. |
| 5 DGND | Low-side ground | Digital ground reference for DOUT/CLKOUT; ties to MCU/FPGA ground - forms isolation boundary with AGND. |
| 6 DOUT | Digital output | 1-bit Manchester-encoded bitstream synchronized to CLKOUT falling edge; requires matched trace length to CLKOUT. |
| 7 CLKOUT | Digital output | 10MHz square wave (83.3–125ns period); serves as sampling clock for external sinc3 filter - jitter <2ns. |
| 8 DVDD | Low-side power | Digital-domain supply (4.5–5.5V); powers output drivers only - independent of AVDD for noise isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive SiO₂ Isolation Barrier | Enables 3500VPEAK basic isolation with >10¹²Ω insulation resistance and ~1.5pF input-to-output capacitance - minimizes high-frequency coupling into control domain. |
| Integrated 10MHz Clock Generator | Removes external crystal or oscillator, reducing BOM count and PCB area while guaranteeing precise DOUT/CLKOUT phase alignment for deterministic filtering. |
| ±280mV Input Range Optimized for Shunts | Matches 50–100A current-sense shunts (e.g., 2mΩ @ 100A = 200mV), avoiding signal attenuation or amplification stages that degrade SNR and introduce offset drift. |
| 15kV/µs Common-Mode Transient Immunity | Withstands rapid dV/dt events from SiC/GaN switches without metastability or bit errors - validated per VDE 0884-17 Annex C. |
| Specified Performance Over –40°C to +105°C | Guarantees ±1mV offset and ±1% gain error across full industrial temperature range - enables single-point calibration in motor drive field deployments. |
Applications
| Industrial Motor Drives | Frequency Inverters |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase PMSM/induction motor drives using low-value shunt resistors mounted on inverter leg PCBs. IC Role / Device Role / Timing Role: Galvanically isolated delta-sigma modulator converting shunt voltage to synchronized 1-bit bitstream for FPGA/MCU-based sinc3 decimation. Use Value: Enables closed-loop torque control with <1µs latency and <0.1% current measurement error across temperature - meeting IEC 61800-5-1 functional safety requirements. |
Use Scenario: Bidirectional current monitoring in AC/DC and DC/AC stages of variable-frequency drives for HVAC and pump systems. IC Role / Device Role / Timing Role: High-CMTI isolated modulator feeding bitstream to C2000™ SDFM peripheral for simultaneous multi-channel current reconstruction. Use Value: Supports 20kHz PWM switching with 39kSPS data rate and 87dB SNR - eliminating current sensor drift-induced speed ripple in vector-controlled inverters. |
| Uninterruptible Power Supplies (UPS) | Power Conversion Circuits |
Use Scenario: Input/output DC current sensing in double-conversion online UPS units operating at 400V–800V bus voltages with fast load-step transients. IC Role / Device Role / Timing Role: Basic-isolated modulator providing isolated current feedback to digital controller without optocoupler latency or aging effects. Use Value: Delivers 16-bit resolution at 39kSPS with ±1mV offset stability - enabling precise battery charge/discharge current regulation and overload protection within 100µs response window. |
Use Scenario: Primary-side current sensing in isolated DC-DC converters (e.g., LLC, phase-shifted full-bridge) for peak-current-mode control and overcurrent shutdown. IC Role / Device Role / Timing Role: Isolated modulator placed on high-voltage primary side, transmitting bitstream across barrier to secondary-side controller via short traces. Use Value: Achieves <500ns propagation delay from analog input to DOUT edge - enabling cycle-by-cycle current limiting at 1MHz switching frequencies without added gate-driver delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated delta-sigma modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1303M0510DWR | Reinforced isolation (5000VPK), ±50mV input range, integrated ±10V output driver - requires external gain stage for shunt use. | Targeted at voltage sensing and higher-precision current sensing where reinforced isolation is mandated (e.g., medical, grid-tie). | Select when UL/IEC reinforced certification is required and system can accommodate signal conditioning for ±280mV shunt outputs. |
| ISO224BDWVR | Galvanic isolation with 10MHz bandwidth, ±10V input, 4.5V/V fixed gain - analog output, not bitstream; no internal clock. | Suitable for analog-domain feedback loops requiring continuous voltage output rather than digital bitstream processing. | Choose when existing control architecture lacks sinc3 filter capability and demands analog output compatible with standard ADCs or op-amp interfaces. |
Compared with AMC1303M0510DWR and ISO224BDWVR, the AMC1203BDUB uniquely combines basic isolation, ±280mV shunt-optimized input, and embedded 10MHz clock - making it the most direct fit for cost-sensitive, high-volume motor drive and inverter designs requiring minimal external components and deterministic digital interface timing.
Availability
AMC1203BDUB 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 programs.
Supply support for AMC1203BDUB 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 high-reliability ICs for industrial, automotive, and communications markets.
The AMC1203BDUB belongs to TI's precision isolated modulator product line, engineered specifically for high-accuracy, high-CMTI current sensing in noisy power electronics environments - with focus on motor control, energy conversion, and industrial automation.
FAQ
What is the isolation rating of the AMC1203BDUB and which standards does it meet?
The AMC1203BDUB provides 3500VPEAK basic isolation per DIN EN IEC 60747-17 (VDE 0884-17) and 2500VRMS for 1 minute per UL1577. It is certified for basic insulation only - not reinforced - and carries VDE certificate number 40047657 and UL file E181974. This rating applies specifically to the DUB package configuration.
Does the AMC1203BDUB require an external clock source?
No, the AMC1203BDUB integrates a 10MHz ±2MHz internal clock generator. The CLKOUT pin provides this clock as a CMOS-level square wave with 83.3–125ns period and <2ns jitter, eliminating need for external oscillators or crystals. This clock synchronizes the DOUT bitstream and serves as sampling reference for external sinc3 filters.
How does the AMC1203BDUB differ from the standard AMC1203 in terms of accuracy?
The AMC1203BDUB is the "B" grade variant: it specifies ±1% max gain error (vs ±2% for AMC1203) and ±6LSB INL (vs ±9LSB), while maintaining identical ±1mV offset error, ±5µV/°C offset drift, and ±20ppm/°C gain drift. These tighter specifications reduce calibration overhead in high-volume motor drive production.
What digital filtering is required to obtain usable data from the AMC1203BDUB?
The AMC1203BDUB outputs a 1-bit bitstream requiring external digital decimation. A sinc3 filter with oversampling ratio (OSR) of 256 is recommended to achieve 16-bit resolution, 87dB SNR, and 39kSPS output rate. This is commonly implemented in TI C2000™ MCUs via the SDFM peripheral or in FPGAs using HDL-based filter logic.
Can the AMC1203BDUB be used with shunt resistors larger than 2mΩ?
Yes - the AMC1203BDUB's ±280mV linear input range supports shunt values up to ~5.6mΩ at 50A (280mV/50A). However, for shunts >2mΩ, thermal drift and PCB layout parasitics become more influential on accuracy; TI recommends Kelvin connections, symmetric trace routing, and AGND/DGND separation to maintain specified ±1mV offset performance.
AMC1203BDUB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SMD, Gull Wing
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 8-SOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AMC1203BDUB FAQ
1.How can I place an order for AMC1203BDUB through Aetrix?
Please submit a Request for Quotation (RFQ) for AMC1203BDUB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AMC1203BDUB reliable?
The price and inventory of AMC1203BDUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMC1203BDUB is usually 5 days.
3.What payment methods are accepted for AMC1203BDUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMC1203BDUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMC1203BDUB?
AMC1203BDUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMC1203BDUB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AMC1203BDUB?
For technical support, including AMC1203BDUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMC1203BDUB requirements.
6.How does Aetrix verify that AMC1203BDUB is sourced from the original manufacturer or authorized distributors?
All AMC1203BDUB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AMC1203BDUB meets industry standards.
7.What is the process for return or replacement of AMC1203BDUB?
All AMC1203BDUB units undergo pre-shipment inspection (PSI). If there is an issue with AMC1203BDUB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AMC1203BDUB part is unused and in its original packaging.
Return procedure for AMC1203BDUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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