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Texas Instruments ADC121S021CIMF-TI
- Part No.:
- ADC121S021CIMF-TI
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
ADC121S021CIMF-TI.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
ADC121S021CIMF-TI from Texas Instruments is a single-channel, 12-bit successive-approximation analog-to-digital converter with SPI/QSPI/MICROWIRE-compatible serial interface, operating at 50–200 ksps sample rates, 2.7V–5.25V supply, and guaranteed −40°C to +85°C industrial temperature range. It delivers 72.3 dB SNR and ±0.45 LSB typical INL for precision data acquisition in portable instrumentation.
For engineers reviewing the ADC121S021CIMF-TI datasheet, ADC121S021CIMF-TI pinout, ADC121S021CIMF-TI application, or ADC121S021CIMF-TI equivalent, key selection criteria include its 6-lead SOT-23 package, 1.5 mW power at 3.6V, shutdown mode consuming only 2.6 µW, straight-binary output format, and full specification across variable throughput-not just fixed-rate operation.
Technical Context
The ADC121S021CIMF-TI implements a charge-redistribution SAR architecture with internal track-and-hold, where acquisition begins on the 13th rising edge of SCLK after CS assertion and sampling occurs on the falling edge of CS. Aperture jitter is specified at 30 ps, and full-power bandwidth reaches 11 MHz at 5V supply.
Its serial interface uses a 3-wire SPI-compatible protocol: CS initiates conversion and frames data, SCLK controls timing (1–4 MHz), and SDATA outputs 12-bit straight-binary data with three leading zeros on falling edges. The device supports two operational modes-normal (continuous or burst) and shutdown-with automatic power-up requiring one dummy conversion before valid output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes-ensures monotonicity and deterministic code mapping for control-loop feedback. |
| Sample Rate Range | 50–200 ksps-fully specified across this range, enabling flexible throughput tuning without derating. |
| INL (typ) | +0.45 / −0.4 LSB-limits end-point error in calibrated sensor systems requiring <±1 LSB linearity. |
| SNR (typ) | 72.3 dB-supports >11.7 ENOB for high-fidelity signal capture in audio-grade or vibration monitoring applications. |
| Power @ 3.6V | 1.5 mW-enables battery-powered operation for >1 year in low-duty-cycle remote sensing nodes. |
| Shutdown Power | 2.6 µW @ 5.25V-reduces idle current by >3000×, critical for energy harvesting or wake-on-event designs. |
| Supply Range | 2.7V–5.25V-interoperable with both 3.3V and 5V logic domains without level-shifting. |
Pinout & Package
ADC121S021CIMF-TI is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), footprint-compatible with standard pick-and-place equipment and offering thermal resistance θJA = 265°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VA) | Analog supply input | Must be bypassed with 1 µF + 0.1 µF capacitors within 1 cm; serves as internal reference-supply noise directly degrades SNR. |
| 2 (GND) | Analog/digital ground return | Single ground plane required; no separation needed due to integrated digital isolation in SAR core. |
| 3 (VIN) | Analog input | 0V to VA range; input capacitance is 4 pF in hold mode-requires low-impedance driver or anti-aliasing filter for AC signals. |
| 4 (SCLK) | Serial clock input | Accepts 1–4 MHz clock; duty cycle 40–60%; controls both conversion timing and data readout synchronization. |
| 5 (SDATA) | Serial data output | Tri-state output; clocks out 15-bit frame (3 leading zeros + 12 data bits MSB-first) on falling SCLK edges. |
| 6 (CS) | Chip select | Falling edge starts conversion; high state forces shutdown mode; rising edge returns SDATA to high-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Variable sample rate specification | Full AC/DC performance guaranteed from 50 to 200 ksps-eliminates need for derating or overspecifying clock sources. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to TI C2000, MSP430, and Sitara processors without protocol translation or glue logic. |
| Supply-as-reference architecture | Eliminates external voltage reference component and associated cost, layout area, and drift errors. |
| Low-power shutdown mode | 2.6 µW quiescent consumption enables microamp-level system sleep states in portable medical or IoT endpoints. |
| Industrial temperature range | −40°C to +85°C operation validated-suitable for under-hood automotive sensors or factory-floor PLC modules. |
Applications
| Portable Data Loggers | Remote Sensor Nodes |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure every 10 seconds using solar charging. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog sensor outputs; operates in burst mode-active only during sampling window. Use Value: 1.5 mW active power and 2.6 µW shutdown enable multi-year field deployment without battery replacement. | Use Scenario: Wireless vibration sensors mounted on rotating machinery in unattended industrial facilities. IC Role / Device Role / Timing Role: High-fidelity analog front-end digitizing accelerometer outputs at 100 ksps for FFT-based fault detection. Use Value: 72.3 dB SNR and 11.7 ENOB ensure accurate spectral resolution down to −83 dBFS intermodulation distortion. |
| Programmable Logic Controller I/O Modules | Medical Diagnostic Equipment |
Use Scenario: DIN-rail mounted PLC analog input card acquiring 4–20 mA loop signals from process transmitters. IC Role / Device Role / Timing Role: Isolated channel ADC interfacing via optocoupled SPI bus; handles 50–200 ksps configurable scan rates per channel. Use Value: Pin-compatible family allows scaling resolution/speed without PCB redesign-e.g., upgrade to ADC121S101 for 1 Msps. | Use Scenario: Portable ECG monitor digitizing lead-II differential signals with 12-bit resolution and clinical-grade linearity. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC referenced to its own supply-minimizes calibration drift over time and temperature. Use Value: ±0.45 LSB typical INL and 30 ps aperture jitter meet AAMI EC11 requirements for diagnostic waveform fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC121S051CIMF-TI | Same 6-lead SOT-23 package and SPI interface, but specified for 200–500 ksps range; higher clock requirement (up to 8 MHz). | Better suited for real-time motor control loops requiring faster sampling, not low-power intermittent acquisition. | Select when system demands >200 ksps sustained throughput and can support higher SCLK frequency. |
| ADS7822U | 12-bit SAR ADC in 8-lead SOIC; requires external reference; 200 ksps max; 3.3V-only supply; no shutdown mode. | Lacks integrated power management and supply-as-reference-increases BOM count and reduces flexibility in mixed-voltage systems. | Choose only if legacy board space accommodates larger SOIC and design tolerates fixed 3.3V operation without ultra-low-power sleep. |
Compared with ADC121S021CIMF-TI, ADC121S051CIMF-TI trades lower idle power for higher minimum sample rate, while ADS7822U sacrifices integration and flexibility for marginally lower cost in non-battery-constrained applications.
Availability
ADC121S021CIMF-TI is available at Aetrix Electronics and suitable for portable data loggers, remote sensor nodes, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for ADC121S021CIMF-TI 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy precision analog products.
The ADC121S021CIMF-TI belongs to TI's legacy SAR ADC portfolio designed for cost-sensitive, low-power industrial and portable measurement systems where integration, small size, and guaranteed performance across variable throughput are essential.
FAQ
What is the maximum guaranteed sample rate for ADC121S021CIMF-TI?
The ADC121S021CIMF-TI is fully specified for operation up to 200 ksps. While the device can function at up to 1 Msps under certain conditions, only the 50–200 ksps range guarantees all AC and DC specifications-including INL, SNR, and THD-across the full industrial temperature range and supply voltage span. This ensures predictable performance in production systems without test-margin uncertainty.
Does ADC121S021CIMF-TI require an external voltage reference?
No, ADC121S021CIMF-TI uses its analog supply voltage (VA) as the internal reference, eliminating the need for an external precision reference. This simplifies BOM, reduces board area, and avoids reference-related drift-but means supply noise directly impacts SNR, so proper decoupling (1 µF + 0.1 µF near VA pin) is mandatory for achieving the specified 72.3 dB SNR.
How does the shutdown mode of ADC121S021CIMF-TI work?
ADC121S021CIMF-TI enters shutdown mode when CS is pulled high between the 2nd and 10th falling edge of SCLK after conversion initiation. In shutdown, analog circuitry powers down, reducing consumption to 2.6 µW at 5.25V. Exiting shutdown requires pulling CS low again, followed by one dummy conversion before valid data appears-ensuring reliable wake-up timing without external reset sequencing.
Is ADC121S021CIMF-TI pin-compatible with other devices in the ADC121Sxx1 family?
Yes, ADC121S021CIMF-TI is fully pin- and function-compatible with ADC121S051CIMF-TI and ADC121S101CIMF-TI in the same 6-lead SOT-23 package. This allows direct substitution to increase sample rate (to 500 ksps or 1 Msps) without PCB changes-provided the host processor supports the higher SCLK frequency and timing constraints of the faster variants.
What is the purpose of the three leading zero bits in ADC121S021CIMF-TI's SDATA output?
The three leading zero bits in ADC121S021CIMF-TI's 15-bit SDATA frame (000 + 12-bit result) align the 12-bit conversion result to a byte boundary, simplifying firmware parsing on 8-bit microcontrollers. They also provide timing margin for setup/hold compliance and allow unambiguous identification of frame start-even if CS timing varies-ensuring robust communication in electrically noisy industrial environments.
ADC121S021CIMF-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- DSP, Microwire, QSPI, SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC121S021CIMF-TI FAQ
1.How can I place an order for ADC121S021CIMF-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S021CIMF-TI 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 ADC121S021CIMF-TI reliable?
The price and inventory of ADC121S021CIMF-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S021CIMF-TI is usually 5 days.
3.What payment methods are accepted for ADC121S021CIMF-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S021CIMF-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S021CIMF-TI?
ADC121S021CIMF-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S021CIMF-TI 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 ADC121S021CIMF-TI?
For technical support, including ADC121S021CIMF-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S021CIMF-TI requirements.
6.How does Aetrix verify that ADC121S021CIMF-TI is sourced from the original manufacturer or authorized distributors?
All ADC121S021CIMF-TI 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 ADC121S021CIMF-TI meets industry standards.
7.What is the process for return or replacement of ADC121S021CIMF-TI?
All ADC121S021CIMF-TI units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S021CIMF-TI, 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 ADC121S021CIMF-TI part is unused and in its original packaging.
Return procedure for ADC121S021CIMF-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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