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Texas Instruments SM73201IMMX/NOPB
- Part No.:
- SM73201IMMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
SM73201IMMX/NOPB.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
SM73201IMMX/NOPB from Texas Instruments is a 16-bit successive-approximation register (SAR) analog-to-digital converter optimized for photovoltaic DC arc detection and solar data acquisition. It delivers 250 kSPS maximum sampling rate, 93.2 dBc SNR at 4.5–5.5 VREF, and 85 dB common-mode rejection ratio with true differential input. Its zero-power track mode enables low-power operation in battery-powered remote monitoring systems.
For engineers reviewing the SM73201IMMX/NOPB datasheet, SM73201IMMX/NOPB pinout, SM73201IMMX/NOPB application, or SM73201IMMX/NOPB equivalent, key selection criteria include its 50–250 kSPS programmable throughput, separate VA/VIO supplies (+4.5–5.5 V / +2.7–5.5 V), external reference range (+0.5 V to VA), SPI-compatible serial interface, and −40°C to +85°C industrial temperature rating.
Technical Context
The SM73201IMMX/NOPB implements a capacitive redistribution SAR architecture with integrated sample-and-hold, maintaining full differential signal path from input pins through conversion to ensure 85 dB CMRR. Its zero-power track mode (ZPTM) allows continuous analog input tracking during idle periods without latency on conversion initiation.
It uses an external voltage reference (VREF) to define the ±VREF differential input range, supports binary 2's complement output coding, and requires exactly 18 SCLK cycles per full 16-bit conversion. The SPI-compatible interface operates with independent digital I/O supply (VIO), enabling mixed-voltage system interfacing with 3.3 V controllers while analog section runs at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - provides 65,536 discrete output codes for high-precision measurement of small-signal transducer outputs. |
| Sampling Rate | 50–250 kSPS - configurable throughput supports both high-speed transient capture (e.g., arc fault rise time) and lower-rate energy logging. |
| SNR | 93.2 dBc at VREF = 4.5–5.5 V - enables >15-bit effective resolution for clean spectral analysis in PV string monitoring. |
| CMRR | 85 dB - rejects common-mode noise from long cable runs in solar farm environments without external instrumentation amplifiers. |
| Power (250 kSPS) | 5.8 mW at VA = 5 V - ultra-low active power enables direct integration into energy-harvesting sensor nodes. |
| Power-Down Current | 10 µW - allows microamp-level sleep-state current for duty-cycled arc detection systems. |
| Analog Supply Range | +4.5 V to +5.5 V - compatible with standard 5 V rail while ensuring robust operation across line and load variation. |
| Digital I/O Supply | +2.7 V to +5.5 V - supports direct interfacing to 3.3 V microcontrollers without level-shifting circuitry. |
Pinout & Package
SM73201IMMX/NOPB is housed in a 10-lead VSSOP package (Package Number DGS0010A), 3.0 mm × 3.0 mm × 1.0 mm body, 0.5 mm pitch, thermally enhanced for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Voltage reference input | Defines full-scale differential input range (±VREF); accepts 0.5 V to VA, enabling flexible scaling for bridge sensors or shunt-based current sensing. |
| +IN | Non-inverting analog input | Differential input terminal; used with −IN to reject common-mode noise in high-impedance PV string voltage monitoring. |
| −IN | Inverting analog input | Completes differential pair; maintains matched trace routing requirement for optimal CMRR performance. |
| GND (Pins 4 & 5) | Analog/digital ground reference | Dual GND pins support star grounding - Pin 4 for analog return, Pin 5 for digital return - minimizing coupling between domains. |
| CS | Chip select (active-low) | Initiates conversion and controls serial output enable; high state activates zero-power track mode (ZPTM) for lowest quiescent current. |
| DOUT | Serial data output | SPI-compatible MSB-first output; no pipeline delay - data reflects conversion in progress, enabling deterministic timing control. |
| SCLK | Serial clock input | Drives conversion timing and data transfer; 1–5 MHz range allows trade-off between speed and EMI; duty cycle not critical. |
| VIO | Digital I/O supply | Independent 2.7–5.5 V rail powers logic interface - decouples digital noise from analog section and enables 3.3 V MCU compatibility. |
| VA | Analog supply | 4.5–5.5 V analog rail powers internal SAR core and reference buffer - higher PSRR (−78 dB) ensures stable conversion under supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input with 85 dB CMRR | Enables direct connection to floating PV string voltages without isolation amplifiers, reducing BOM cost and board space in arc detection modules. |
| Zero-power track mode (ZPTM) | Eliminates wake-up latency when transitioning from ultra-low-power tracking (<10 µW) to full conversion - critical for event-triggered arc sensing. |
| Separate VA and VIO supplies | Allows analog section to run at 5 V for optimal SNR while interfacing to 3.3 V microcontrollers - avoids level shifters and associated timing skew. |
| External reference (0.5 V to VA) | Permits precision scaling: e.g., 2.5 V reference yields 76.3 µV/LSB for high-resolution current sensing; 5 V reference maximizes dynamic range for voltage monitoring. |
| SPI/QSPI/MICROWIRE-compatible interface | Uses only three wires (CS, SCLK, DOUT) - simplifies PCB layout and firmware integration in resource-constrained solar gateway MCUs. |
| −40°C to +85°C operating range | Rated for outdoor deployment in rooftop and ground-mount PV installations with no derating - validated across full temperature and supply range. |
Applications
| Photovoltaic DC Arc Detection | Solar String Monitoring |
|---|---|
|
Use Scenario: Real-time detection of series arc faults in ungrounded PV arrays using high-frequency current/voltage signature analysis. IC Role / Device Role / Timing Role: Primary ADC capturing 250 kSPS differential current samples across shunt resistor for FFT-based arc classification. Use Value: 93.2 dBc SNR and 108 dBc SFDR enable reliable separation of arc harmonics from switching noise in inverters and optimizers. |
Use Scenario: Continuous monitoring of individual PV string voltage and current for performance degradation and mismatch analysis. IC Role / Device Role / Timing Role: High-accuracy 16-bit ADC digitizing isolated string outputs via precision resistive dividers and current sense amplifiers. Use Value: ±0.8 LSB INL and 2.5 µV/°C offset drift ensure <0.1% measurement error over temperature - critical for yield loss attribution. |
| Industrial I/O Modules | Renewable Energy Data Loggers |
|
Use Scenario: Modular analog input cards for PLCs and SCADA systems acquiring sensor data from wind turbine pitch control or battery management systems. IC Role / Device Role / Timing Role: Precision SAR ADC providing galvanically isolated analog inputs with programmable gain and filtering in compact DIN-rail enclosures. Use Value: Separate VA/VIO supplies and 85 dB CMRR eliminate need for external isolation amplifiers - reducing component count and thermal footprint. |
Use Scenario: Low-power, solar-charged field loggers collecting irradiance, temperature, and panel voltage data in off-grid telecom or agricultural sites. IC Role / Device Role / Timing Role: Core ADC operating in burst mode: 250 kSPS acquisition for 10 ms, then 10 µW power-down for 990 ms between measurements. Use Value: 10 µW power-down current extends battery life to >5 years on single Li-SOCl₂ cell - validated across −40°C to +85°C operating envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1 MSPS, single-ended input only; no ZPTM; requires external reference buffer; 1.8 V VIO only. | Better speed but lacks differential input and CMRR - unsuitable for noisy PV string sensing without front-end signal conditioning. | Select only if system uses fully differential driver stage and requires >250 kSPS; verify VIO compatibility with host controller. |
| ADS7953IRHBT | 12-bit, 1 MSPS, 8-channel SAR with integrated sequencer; no external VREF; 2.7–5.25 V VIO. | Higher channel count and integrated MUX simplify multi-string monitoring but sacrifices 4-bit resolution and SNR for arc signature fidelity. | Prefer for cost-sensitive multi-string gateways where 12-bit resolution suffices; avoid for arc fault spectral analysis requiring ≥15 ENOB. |
Compared with ADS8860IDRCT and ADS7953IRHBT, SM73201IMMX/NOPB uniquely combines true differential input, 85 dB CMRR, zero-power track mode, and 16-bit/250 kSPS performance in a 10-pin VSSOP - making it the only option qualified for direct PV string voltage/current digitization in arc detection systems without added signal conditioning.
Availability
SM73201IMMX/NOPB is available at Aetrix Electronics and suitable for photovoltaic DC arc detection, solar string monitoring, and industrial I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SM73201IMMX/NOPB 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 heritage in precision data converters and renewable energy solutions.
The SM73201IMMX/NOPB belongs to TI's renewable-energy-grade precision SAR ADC product line, designed specifically for high-reliability, low-power, high-accuracy sensing in photovoltaic monitoring, arc fault detection, and distributed energy systems.
FAQ
What is the maximum sampling rate supported by the SM73201IMMX/NOPB?
The SM73201IMMX/NOPB supports a maximum sampling rate of 250 kSPS at full 16-bit resolution with VREF = 4.5–5.5 V and fSCLK = 5 MHz. At lower clock frequencies or reduced resolution (via short cycling), the effective throughput may be lower. The device is specified across 50–250 kSPS, with guaranteed performance including 93.2 dBc SNR and ±0.8 LSB INL at the top end of this range. SM73201IMMX/NOPB achieves this using an 18-cycle SCLK conversion protocol with no pipeline latency.
Does the SM73201IMMX/NOPB support true differential input operation?
Yes, the SM73201IMMX/NOPB features a true differential input architecture with dedicated +IN and −IN pins, delivering 85 dB common-mode rejection ratio (CMRR) across its operating temperature range. This allows direct connection to floating, high-impedance sources such as PV string voltage taps without external instrumentation amplifiers. The transfer function is defined as (+IN) − (−IN), and the full-scale range is ±VREF - a capability confirmed in the functional description and electrical characteristics tables of the SNOSB89B datasheet. SM73201IMMX/NOPB maintains differential signaling throughout its internal SAR core.
What power supply configurations does the SM73201IMMX/NOPB require?
The SM73201IMMX/NOPB requires two independent supplies: analog supply VA (+4.5 V to +5.5 V) and digital I/O supply VIO (+2.7 V to +5.5 V). This dual-supply architecture isolates analog noise from digital switching and enables interfacing with 3.3 V microcontrollers while maintaining optimal analog performance at 5 V. An external reference voltage VREF (0.5 V to VA) sets the input range. Ground connections are split: Pins 4 and 5 are both GND, intended for separate analog and digital return paths to minimize coupling. SM73201IMMX/NOPB draws 5.8 mW at 250 kSPS and drops to 10 µW in power-down mode.
Is the SM73201IMMX/NOPB compatible with SPI interface standards?
Yes, the SM73201IMMX/NOPB provides an SPI-compatible serial interface using CS (active-low chip select), SCLK (serial clock), and DOUT (data out) pins. It supports SPI, QSPI, and MICROWIRE protocols with MSB-first, binary 2's complement output. Each full 16-bit conversion requires exactly 18 SCLK cycles, and CS can be asserted early to truncate output for partial-word reads. Timing parameters (tCSS, tCSH, tDA, etc.) are fully specified and compliant with standard SPI timing conventions. SM73201IMMX/NOPB does not require a data-in line, making it a simplified SPI slave device ideal for read-only sensor interfaces.
What is Zero-Power Track Mode (ZPTM) and how does it benefit system design?
Zero-Power Track Mode (ZPTM) is a proprietary low-power state in the SM73201IMMX/NOPB where the internal sampling capacitor array continuously tracks the applied analog input voltage while consuming only 10 µW (typical). ZPTM is entered automatically after conversion completion or when CS is held high, and transitions to active conversion mode occur with zero latency. This eliminates wake-up delays in event-driven systems like arc fault detectors, enabling immediate response to transients. SM73201IMMX/NOPB leverages ZPTM to achieve ultra-low average power in duty-cycled solar monitoring applications - a feature not found in most competing 16-bit SAR ADCs.
SM73201IMMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
SM73201IMMX/NOPB FAQ
1.How can I place an order for SM73201IMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM73201IMMX/NOPB 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 SM73201IMMX/NOPB reliable?
The price and inventory of SM73201IMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM73201IMMX/NOPB is usually 5 days.
3.What payment methods are accepted for SM73201IMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM73201IMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM73201IMMX/NOPB?
SM73201IMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM73201IMMX/NOPB 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 SM73201IMMX/NOPB?
For technical support, including SM73201IMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM73201IMMX/NOPB requirements.
6.How does Aetrix verify that SM73201IMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All SM73201IMMX/NOPB 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 SM73201IMMX/NOPB meets industry standards.
7.What is the process for return or replacement of SM73201IMMX/NOPB?
All SM73201IMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM73201IMMX/NOPB, 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 SM73201IMMX/NOPB part is unused and in its original packaging.
Return procedure for SM73201IMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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