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Texas Instruments ADC121S051CIMFX/NOPB
- Part No.:
- ADC121S051CIMFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
ADC121S051CIMFX/NOPB.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,124
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Product details
Overview
ADC121S051CIMFX/NOPB from Texas Instruments is a single-channel, 12-bit successive-approximation ADC with SPI/QSPI/MICROWIRE/DSP-compatible serial interface, operating at 200–500 ksps sample rates, 2.7V–5.25V supply, and delivering 72 dB typical SNR for precision sensor and control signal digitization in portable instrumentation.
For engineers reviewing the ADC121S051CIMFX/NOPB datasheet, ADC121S051CIMFX/NOPB pinout, ADC121S051CIMFX/NOPB application, or ADC121S051CIMFX/NOPB equivalent, this page delivers verified pin functions, real-world timing constraints (tACQ = 350 ns max, tQUIET ≥ 50 ns), power-down capability (2.6 µW at 5.25V), and drop-in alternatives within the ADC121S family.
Technical Context
The ADC121S051CIMFX/NOPB implements a charge-redistribution DAC core with internal track-and-hold, enabling precise sampling of analog inputs (0 V to VA) without external hold capacitors. Its conversion sequence is initiated by CS falling edge, with acquisition completed before the next CS pulse-requiring ≥350 ns quiet time (tQUIET) and ≥13 SCLK rising edges between conversions.
Serial output is straight binary, 3 leading zeros + 12 data bits MSB-first on SDATA, synchronized to SCLK falling edges. Timing is fully specified across 4–10 MHz SCLK and 200–500 ksps sample rates, with aperture jitter of 30 ps and full-power bandwidth of 8–11 MHz depending on supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes-guarantees monotonicity and full-scale linearity for control-loop feedback. |
| Sample Rate Range | 200–500 ksps-fully characterized across this range, not just at a single rate, enabling flexible throughput tuning. |
| INL / DNL | +0.45/−0.40 LSB and +0.5/−0.25 LSB typical-supports <±1 LSB error in closed-loop systems requiring high code accuracy. |
| SNR | 72.0 dB typical at 100 kHz input-enables >11.7 ENOB for clean digitization of low-noise sensor outputs. |
| Power Consumption | 1.7 mW at 3.6V / 8.7 mW at 5.25V normal mode; 2.6 µW shutdown-ideal for battery-powered devices with duty-cycled sensing. |
| Supply Voltage | 2.7V to 5.25V-supports direct interfacing with 3.3V and 5V logic domains without level-shifting. |
| Interface Compatibility | SPI™/QSPI™/MICROWIRE/DSP-ensures plug-and-play integration with common microcontrollers and DSPs. |
Pinout & Package
ADC121S051CIMFX/NOPB is packaged in a 6-lead WSON (NGF) package with exposed thermal pad, pin-compatible with SOT-23 (DBV); both packages support industrial −40°C to +85°C operation and require local 1 μF + 0.1 μF bypassing on VA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA | Analog supply input | Provides reference and core power; must be bypassed within 1 cm using 1 μF + 0.1 μF capacitors to maintain SNR performance. |
| GND | Analog/digital ground return | Common reference for analog input, digital I/O, and supply; center pad (if present) must be connected to GND for thermal and noise integrity. |
| VIN | Analog input | Single-ended input ranging 0 V to VA; driven by low-impedance source to minimize distortion from 26 pF sampling capacitor charging. |
| SCLK | Serial clock input | Controls conversion timing and data readout; supports 4–10 MHz operation with 40–60% duty cycle; defines 16-cycle frame for full 12-bit transfer. |
| SDATA | Serial data output | Tri-state output delivering 3 zero bits + 12-bit result MSB-first on falling SCLK edges; enters high-Z after 16th falling edge or CS rise. |
| CS | Chip select | Falling edge initiates conversion and enables SDATA; high state forces shutdown mode (2.6 µW), enabling dynamic power scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Variable power management | Shuts down to 2.6 µW via CS high; enables microcontroller-controlled sleep/wake cycles without external regulators. |
| Specified over full sample rate range | Guaranteed INL, DNL, SNR, and timing across 200–500 ksps-not interpolated or extrapolated-reducing design validation effort. |
| Straight binary output format | Eliminates offset correction in firmware; simplifies data alignment and reduces CPU overhead in real-time systems. |
| Internal track-and-hold circuit | Removes need for external sample-hold IC or precision op-amp buffer, reducing BOM count and board area in space-constrained designs. |
| ESD-protected analog inputs | Withstands ±10 mA transient current and 3500V HBM-tolerates handling and board-level transients without external protection diodes. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Digitizing thermistor, strain gauge, or pH electrode outputs in handheld diagnostic tools with 24-hour battery life. IC Role / Device Role / Timing Role: Single-channel precision ADC acquiring analog sensor signals at 250 ksps with minimal power draw during active measurement bursts. Use Value: 1.7 mW at 3.6V and 2.6 µW shutdown enable >1000 measurements per battery charge while maintaining <±1 LSB linearity. |
Use Scenario: Sampling temperature, pressure, and flow transducer outputs in PLC analog input modules deployed in factory automation cabinets. IC Role / Device Role / Timing Role: High-reliability ADC interfacing directly to 3.3V microcontrollers via SPI, operating continuously across −40°C to +85°C. Use Value: Pin compatibility with ADC121S021/ADC121S101 allows modular hardware reuse; guaranteed specs over full temp range eliminate derating calculations. |
| Remote Environmental Data Loggers | Test & Measurement Front Ends |
|
Use Scenario: Battery-powered field nodes measuring air quality (CO₂, NOₓ), humidity, and ambient light over multi-week deployments. IC Role / Device Role / Timing Role: Low-quiescent ADC triggered by MCU on scheduled intervals, entering shutdown between samples to conserve energy. Use Value: 350 ns acquisition time and 50 ns minimum tQUIET allow rapid wake-sense-sleep cycles, extending battery life without sacrificing resolution. |
Use Scenario: Embedded digitizer in benchtop multimeters or oscilloscope auxiliary channels requiring stable 12-bit accuracy and low THD. IC Role / Device Role / Timing Role: Precision ADC capturing calibrated analog references with 72 dB SNR and −83 dB THD at 100 kHz input. Use Value: 8–11 MHz full-power bandwidth and 30 ps aperture jitter preserve signal fidelity for AC-coupled measurements up to 100 kHz. |
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 |
|---|---|---|---|
| ADC121S021CIMFX/NOPB | Same 6-lead WSON package, identical pinout, but rated for 50–200 ksps sample rate range and lower power (1.1 mW at 3.6V). | Better suited for low-throughput, ultra-low-power systems where 200 ksps is excessive and longer acquisition windows are acceptable. | Select when system requires <200 ksps and prioritizes sub-mW average power over maximum speed. |
| ADC121S101CIMFX/NOPB | Pin- and function-compatible 12-bit SAR ADC rated for 500 ksps to 1 Msps, with higher supply current (12.5 mW at 5.25V) and tighter timing (tACQ = 200 ns). | Required for applications needing >500 ksps sustained throughput, such as motor phase current sampling or ultrasonic echo digitization. | Select when system demands >500 ksps with same footprint and firmware interface, accepting higher power and faster clock requirements. |
Compared with ADC121S021CIMFX/NOPB, the ADC121S051CIMFX/NOPB delivers 2.5× higher maximum sample rate with only +0.6 mW additional power at 3.6V; versus ADC121S101CIMFX/NOPB, it trades 500 ksps headroom for 3.8 mW lower active power and relaxed timing margins-making it optimal for mid-speed, power-sensitive industrial sensing.
Availability
ADC121S051CIMFX/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, remote environmental data loggers, and test & measurement front ends requiring stable component supply, long-term manufacturability, and TI's industrial-grade qualification.
Supply support for ADC121S051CIMFX/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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade reliability.
The ADC121S051CIMFX/NOPB belongs to TI's single-channel, serial-interface SAR ADC product line, designed specifically for space-constrained, low-power industrial and portable instrumentation where accuracy, simplicity, and supply flexibility are critical.
FAQ
What is the minimum acquisition time required between consecutive conversions for ADC121S051CIMFX/NOPB?
The ADC121S051CIMFX/NOPB requires a minimum acquisition time (tACQ) of 350 ns between the 13th rising edge of SCLK and the next falling edge of CS. This ensures the internal sampling capacitor fully charges to the input voltage before the next conversion begins. Failure to meet tACQ degrades INL and DNL performance. The timing is independent of SCLK frequency and must be enforced in firmware or hardware timing control.
Does ADC121S051CIMFX/NOPB support true 12-bit resolution with no missing codes across its full operating range?
Yes, ADC121S051CIMFX/NOPB guarantees no missing codes across its entire specified operating range: −40°C to +85°C, 2.7V–5.25V supply, and 200–500 ksps sample rates. This is confirmed in the Electrical Characteristics table under "Resolution with No Missing Codes" (12 bits) and validated by monotonicity testing per National Semiconductor AOQL standards. It ensures reliable code sequencing in closed-loop control applications.
How does the power-down mode of ADC121S051CIMFX/NOPB operate, and what is its lowest power consumption?
ADC121S051CIMFX/NOPB enters shutdown mode when CS is held high, reducing supply current to 500 nA at 5.25V (2.6 µW). This mode disables the internal oscillator, track-and-hold, and digital logic-retaining no state. Recovery is immediate upon CS falling edge, with no startup delay. Power-down is ideal for intermittent sampling in battery-powered systems where average current must stay below 1 µA.
Is ADC121S051CIMFX/NOPB compatible with 3.3V microcontrollers when powered from a 5.25V supply?
Yes, ADC121S051CIMFX/NOPB supports mixed-voltage operation: its digital pins (SCLK, CS, SDATA) tolerate input voltages up to 5.25V regardless of VA, and VIH/VIL thresholds scale with supply-e.g., VIH = 2.1 V min at 3.6V VA. When VA = 5.25V, VOH = VA − 0.1 V and VOL = 0.1 V, ensuring robust logic-level compatibility with 3.3V MCUs without level shifters.
What is the exact serial data format output by ADC121S051CIMFX/NOPB on the SDATA pin?
ADC121S051CIMFX/NOPB outputs 16 clocked bits per conversion: three leading zero bits followed by twelve straight-binary data bits (MSB first), all aligned to SCLK falling edges. The first bit appears on the first falling SCLK edge after CS falls. SDATA enters high-impedance state after the 16th falling edge or immediately upon CS rising-whichever occurs first-enabling shared bus operation.
ADC121S051CIMFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- 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:
- -
ADC121S051CIMFX/NOPB FAQ
1.How can I place an order for ADC121S051CIMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S051CIMFX/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 ADC121S051CIMFX/NOPB reliable?
The price and inventory of ADC121S051CIMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S051CIMFX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC121S051CIMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S051CIMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S051CIMFX/NOPB?
ADC121S051CIMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S051CIMFX/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 ADC121S051CIMFX/NOPB?
For technical support, including ADC121S051CIMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S051CIMFX/NOPB requirements.
6.How does Aetrix verify that ADC121S051CIMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC121S051CIMFX/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 ADC121S051CIMFX/NOPB meets industry standards.
7.What is the process for return or replacement of ADC121S051CIMFX/NOPB?
All ADC121S051CIMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S051CIMFX/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 ADC121S051CIMFX/NOPB part is unused and in its original packaging.
Return procedure for ADC121S051CIMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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