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Texas Instruments ADC121S051CIMF/NOPB
- Part No.:
- ADC121S051CIMF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
ADC121S051CIMF/NOPB.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
ADC121S051CIMF/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 72.0 dB typical SNR. It serves as a precision analog front-end digitizer in portable instrumentation and remote sensor nodes.
For engineers reviewing the ADC121S051CIMF/NOPB datasheet, ADC121S051CIMF/NOPB pinout, ADC121S051CIMF/NOPB application, or ADC121S051CIMF/NOPB equivalent, key selection criteria include guaranteed 12-bit no-missing-code performance over industrial temperature (−40°C to +85°C), low-power shutdown mode (2.6 µW at 5.25V), and WSON/SOT-23 package compatibility with space-constrained embedded designs.
Technical Context
The ADC121S051CIMF/NOPB implements a charge-redistribution DAC core with internal track-and-hold, enabling precise sampling of analog inputs up to VA (2.7V–5.25V) with 350 ns minimum acquisition time. Its conversion timing is fully synchronous to SCLK, requiring exactly 16 falling edges to output 12 data bits preceded by three leading zeros.
It operates in two modes: normal (CS low, active conversion and serial readout) and shutdown (CS high, <60 µW quiescent current). The digital interface supports variable clock frequency (4–10 MHz), and input voltage range is strictly 0 V to VA - no external reference required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and full code coverage for precision measurement systems. |
| Sample Rate Range | 200–500 ksps - fully specified across this range, eliminating derating assumptions for mid-speed data acquisition. |
| SNR | 72.0 dB (typ) at fIN = 100 kHz - enables >11.7 ENOB for accurate dynamic signal capture in instrumentation. |
| Power Consumption | 1.7 mW at 3.6V / 8.7 mW at 5.25V (normal mode); 2.6 µW at 5.25V (shutdown) - supports battery-powered operation with rapid wake-up. |
| INL / DNL | +0.45/−0.40 LSB and +0.5/−0.25 LSB (typ) - meets tight linearity requirements for closed-loop control and calibration-critical applications. |
| Supply Voltage | 2.7V to 5.25V - allows direct interfacing with 3.3V or 5V logic domains without level-shifting. |
| Interface Compatibility | SPI™/QSPI™/MICROWIRE/DSP - simplifies integration with common microcontrollers and DSPs using standard serial peripheral drivers. |
Pinout & Package
The ADC121S051CIMF/NOPB is available in a 6-lead WSON (3 mm × 3 mm) package with exposed thermal pad, and is also offered in 6-lead SOT-23. Both packages are pin-compatible and support industrial temperature operation (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA | Analog power supply | Provides reference and core supply; must be bypassed with 1 µF + 0.1 µF capacitors within 1 cm to maintain SNR performance. |
| CS | Chip select input | Falling edge initiates conversion and enables SDATA; high state forces shutdown mode with ultra-low power consumption. |
| GND | Analog/digital ground | Common return for all signals and supplies; center pad (in WSON) must be connected to GND for thermal and noise integrity. |
| SDATA | Serial data output | 3-state output delivering 12-bit straight-binary result (MSB first) with 3 leading zeros on falling SCLK edges. |
| VIN | Analog input | Single-ended input referenced to GND, range 0 V to VA; input capacitance is 30 pF (track) / 4 pF (hold) - requires low-Z drive. |
| SCLK | Serial clock input | Controls conversion timing and data readout; supports 4–10 MHz operation with 40–60% duty cycle requirement. |
Key Features
| Feature | Design Value |
|---|---|
| Variable power management | Dynamic trade-off between throughput and power via CS-controlled shutdown - enables µW-level idle current without sacrificing startup latency. |
| Single-supply operation | No external reference needed; VA serves as both supply and full-scale reference - reduces BOM count and layout complexity. |
| Industrial temperature range | Specified from −40°C to +85°C - ensures reliability in harsh environments such as factory automation and outdoor telemetry. |
| Low aperture jitter | 30 ps typical - preserves SNR at higher input frequencies and minimizes noise floor degradation in AC-coupled sensing. |
| Flexible serial interface | Hardware-compatible with SPI, QSPI, MICROWIRE, and DSP serial protocols - eliminates need for custom driver development. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Battery-powered ECG front-end digitizing biopotential signals at 250 ksps with minimal self-heating. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring conditioned analog inputs with 12-bit resolution and 72 dB SNR. Use Value: Low 1.7 mW power at 3.6V extends battery life while maintaining diagnostic-grade signal fidelity under varying load conditions. |
Use Scenario: Remote RTD/thermocouple transmitter in oil & gas pipeline monitoring, operating unattended for years. IC Role / Device Role / Timing Role: Precision digitizer interfaced to sigma-delta sensor conditioner, providing calibrated 12-bit readings over RS-485. Use Value: Guaranteed no-missing-code performance and −40°C to +85°C operation ensure long-term accuracy without recalibration drift. |
| Smart Building Environmental Nodes | Test & Measurement Data Loggers |
|
Use Scenario: Wireless air quality node measuring CO₂, humidity, and VOCs using multi-sensor analog outputs. IC Role / Device Role / Timing Role: Shared ADC resource multiplexed across sensors via external analog switch; SPI interface synchronizes with MCU sleep/wake cycles. Use Value: Shutdown current of 2.6 µW enables microamp-level system sleep current, extending 10-year battery life targets. |
Use Scenario: Benchtop oscilloscope auxiliary channel capturing transient waveforms up to 100 kHz bandwidth. IC Role / Device Role / Timing Role: Secondary digitizer augmenting main ADC with independent sampling control and low-jitter aperture timing. Use Value: 30 ps aperture jitter and 72 dB SNR preserve waveform integrity for post-processing FFT and harmonic analysis. |
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 |
|---|---|---|---|
| ADC121S021CIMF/NOPB | Same pinout and interface, 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 sufficient. | Select when maximum sample rate ≤200 ksps and lowest possible active power is prioritized over speed headroom. |
| ADC121S101CIMF/NOPB | Same footprint, but specified for 500 ksps–1 Msps; higher typical power (10.5 mW at 5.25V) and slightly reduced SNR (70.5 dB). | Targeted at high-speed data logging and real-time control loops requiring ≥500 ksps sustained throughput. | Choose when design requires guaranteed 1 Msps capability and can accommodate higher power and marginally lower dynamic performance. |
Compared with ADC121S021CIMF/NOPB and ADC121S101CIMF/NOPB, the ADC121S051CIMF/NOPB uniquely balances mid-range speed (200–500 ksps), ultra-low shutdown power (2.6 µW), and best-in-class 72 dB SNR - making it optimal for portable instrumentation needing both precision and energy efficiency.
Availability
ADC121S051CIMF/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, smart building environmental nodes, test & measurement data loggers, and remote telemetry systems requiring stable component supply across extended production lifecycles.
Supply support for ADC121S051CIMF/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 IC design.
The ADC121S051CIMF/NOPB belongs to TI's precision SAR ADC family designed specifically for low-power, single-supply, serial-interface applications in portable and distributed sensing systems - emphasizing ease of integration, guaranteed performance across temperature, and robust EMC behavior.
FAQ
What is the absolute maximum analog input voltage for ADC121S051CIMF/NOPB?
The absolute maximum analog input voltage for ADC121S051CIMF/NOPB is VA + 0.3 V, and the minimum is −0.3 V relative to GND. However, the functional input range is strictly 0 V to VA. Exceeding VA or going below GND risks forward-biasing internal ESD diodes, causing unpredictable behavior or damage. Always limit VIN to 0–VA during normal operation.
Does ADC121S051CIMF/NOPB require an external voltage reference?
No, ADC121S051CIMF/NOPB does not require an external voltage reference. It uses its VA supply pin as both power source and full-scale reference, with LSB = VA / 4096. This simplifies design and reduces component count, though supply noise directly impacts accuracy - hence strict bypassing (1 µF + 0.1 µF) is mandatory near the VA pin.
How many clock cycles are needed to read a full conversion result from ADC121S051CIMF/NOPB?
ADC121S051CIMF/NOPB requires exactly 16 falling edges of SCLK to output a complete 12-bit conversion result. The SDATA pin delivers three leading zero bits followed by the 12-bit straight-binary word (MSB first), all synchronized to SCLK falling edges. The output returns to high-impedance after the 16th falling edge or upon CS rising.
Can ADC121S051CIMF/NOPB operate with a 3.3V microcontroller SPI interface?
Yes, ADC121S051CIMF/NOPB is fully compatible with 3.3V SPI interfaces. Its digital inputs (CS, SCLK) accept VIH ≥ 2.1 V at 3.6V VA and VIL ≤ 0.4 V - well within 3.3V logic thresholds. SDATA output swings from 0.03 V to VA − 0.2 V, so at VA = 3.3V, it delivers clean 0–3.1V levels acceptable to standard 3.3V receivers.
What is the quiet time (tQUIET) requirement between consecutive conversions of ADC121S051CIMF/NOPB?
The minimum quiet time tQUIET for ADC121S051CIMF/NOPB is 50 ns. This interval must elapse between the rising edge of CS (ending one conversion) and the next falling edge of CS (initiating the subsequent conversion). Violating tQUIET may cause data corruption or incomplete hold-mode settling, degrading INL/DNL performance.
ADC121S051CIMF/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:
- -
ADC121S051CIMF/NOPB FAQ
1.How can I place an order for ADC121S051CIMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S051CIMF/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 ADC121S051CIMF/NOPB reliable?
The price and inventory of ADC121S051CIMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S051CIMF/NOPB is usually 5 days.
3.What payment methods are accepted for ADC121S051CIMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S051CIMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S051CIMF/NOPB?
ADC121S051CIMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S051CIMF/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 ADC121S051CIMF/NOPB?
For technical support, including ADC121S051CIMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S051CIMF/NOPB requirements.
6.How does Aetrix verify that ADC121S051CIMF/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC121S051CIMF/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 ADC121S051CIMF/NOPB meets industry standards.
7.What is the process for return or replacement of ADC121S051CIMF/NOPB?
All ADC121S051CIMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S051CIMF/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 ADC121S051CIMF/NOPB part is unused and in its original packaging.
Return procedure for ADC121S051CIMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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