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Texas Instruments ADC121S051CISD/NOPB
- Part No.:
- ADC121S051CISD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
ADC121S051CISD/NOPB.pdf
- Description:
- IC ADC 12BIT SAR 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
ADC121S051CISD/NOPB from Texas Instruments is a single-channel, 12-bit successive-approximation ADC with SPI™/QSPI™/MICROWIRE-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 in portable data acquisition systems requiring low power and compact footprint.
For engineers reviewing the ADC121S051CISD/NOPB datasheet, ADC121S051CISD/NOPB pinout, ADC121S051CISD/NOPB application, or ADC121S051CISD/NOPB equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance across industrial temperature (−40°C to +85°C), 6-lead WSON package compatibility, shutdown current as low as 2.6 µW, and straight-binary output timing aligned to falling SCLK edges.
Technical Context
The ADC121S051CISD/NOPB employs a charge-redistribution DAC core with internal track-and-hold, initiating conversion on CS falling edge and sampling at aperture delay of 3 ns. Its serial interface outputs three leading zero bits followed by 12 MSB-first data bits over SDATA, synchronized to SCLK falling edges.
It operates in two modes: normal mode (CS low, 1.7 mW at 3.6V) and shutdown mode (CS high, 2.6 µW at 5.25V), with acquisition time ≤350 ns and quiet time ≥50 ns between conversions. The analog input range is 0 V to VA, and digital I/O supports voltage levels up to 5.25 V independent of VA.
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. |
| Sample Rate Range | 200–500 ksps - fully specified across this range, enabling flexible throughput tuning without performance degradation. |
| INL (typ) | +0.45/−0.40 LSB - defines end-point linearity error affecting absolute accuracy in sensor or instrumentation scaling. |
| DNL (typ) | +0.5/−0.25 LSB - ensures monotonic behavior and prevents code skipping in dynamic signal capture. |
| SNR (typ) | 72.0 dB - determines effective resolution under sinusoidal input; corresponds to ~11.7 ENOB at 100 kHz. |
| Power (3.6V) | 1.7 mW (typ) - enables battery-powered operation in portable systems with minimal thermal impact. |
| Shutdown Current | 2.6 µW at 5.25V - allows microamp-level system sleep states while retaining fast wake-up (<1 µs power-up time). |
| Supply Range | 2.7 V to 5.25 V - supports direct interfacing with common logic rails and LDO outputs without level-shifting. |
Pinout & Package
The ADC121S051CISD/NOPB is housed in a 6-lead WSON package (3 mm × 3 mm, 0.65 mm pitch) with exposed thermal pad (GND-connected). Pin 1 is VA; Pin 2 is GND; Pin 3 is VIN; Pin 4 is SCLK; Pin 5 is SDATA; Pin 6 is CS. The center thermal pad must be soldered to PCB ground for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA (Pin 1) | Analog supply input | Provides reference and core power; requires local 1 μF + 0.1 μF bypassing within 1 cm to maintain SNR performance. |
| GND (Pin 2) | Analog/digital ground return | Common reference for analog input and digital interface; center pad must be connected to GND plane for thermal dissipation. |
| VIN (Pin 3) | Analog input | 0 V to VA range; input impedance modeled as 500 Ω series + 26 pF sampling capacitor - demands low-impedance source or anti-alias filter. |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data readout; 25 kHz–20 MHz range; duty cycle 40–60%; falling edge clocks SDATA output. |
| SDATA (Pin 5) | Serial data output | Three leading zeros + 12-bit straight binary, MSB first; tri-stated when CS high or after 16th SCLK falling edge. |
| CS (Pin 6) | Chip select | Falling edge initiates conversion and enables SDATA; high state forces shutdown mode with sub-µW power consumption. |
Key Features
| Feature | Design Value |
|---|---|
| Full-speed specification across 200–500 ksps | Eliminates need for derating or interpolation - all AC/DC specs (INL, DNL, SNR) validated across entire sample rate range. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Enables plug-in integration with TI C2000, STM32, and Renesas MCUs without protocol translation or glue logic. |
| Single-supply operation (2.7–5.25 V) | Removes requirement for dual supplies or external references - simplifies power architecture in space-constrained designs. |
| Low-power shutdown mode (2.6 µW) | Supports burst-mode sensing in IoT nodes where average current must stay below 10 µA over duty-cycled operation. |
| Industrial temperature range (−40°C to +85°C) | Validated performance for deployment in motor drives, PLC modules, and outdoor environmental monitors without derating. |
| 6-lead WSON package with thermal pad | Reduces PCB area by >40% vs. SOIC-8; thermal pad lowers θJA to 94°C/W - critical for sustained 500 ksps operation in sealed enclosures. |
Applications
| Portable Systems | Remote Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter capturing DC voltage, thermocouple, or RTD signals with 12-bit resolution and battery life >100 hours. IC Role / Device Role / Timing Role: Primary analog-to-digital converter; samples conditioned sensor output at user-selectable rates (200–500 ksps); interfaces via SPI to ARM Cortex-M0+ MCU. Use Value: 1.7 mW active power at 3.6 V extends battery runtime; WSON package enables <12 mm² total front-end area; no-missing-codes guarantee ensures accurate low-level measurements. |
Use Scenario: Solar inverter monitoring module measuring DC bus voltage and current with galvanically isolated inputs. IC Role / Device Role / Timing Role: Isolated-side ADC feeding isolated SPI interface; operates at 250 ksps with 72 dB SNR to resolve 12-bit grid synchronization waveforms. Use Value: 2.7–5.25 V supply range matches isolated DC-DC output; shutdown mode reduces standby leakage during night-time sleep cycles; robust ESD protection (3500 V HBM) withstands field transients. |
| Instrumentation and Control Systems | Industrial Sensor Interfaces |
Use Scenario: Lab-grade bench power supply digitizing output voltage/current feedback for closed-loop regulation. IC Role / Device Role / Timing Role: High-fidelity ADC in analog control loop; tracks fast load transients with 3 ns aperture jitter and 350 ns acquisition window. Use Value: 72 dB SNR and 11.7 ENOB enable sub-0.1% full-scale accuracy; INL ±0.4 LSB ensures linearity-critical calibration traceability; SPI timing aligns with FPGA-based controller clocks. |
Use Scenario: Smart pressure transmitter with HART modulation, converting 4–20 mA loop signals and local sensor readings. IC Role / Device Role / Timing Role: Auxiliary ADC for diagnostics and secondary sensing; shares same 3.3 V rail as main processor; sampled at 200 ksps during commissioning mode. Use Value: Pin-compatible with ADC121S021/ADC121S101 - enables single PCB design supporting 50–1000 ksps variants; 0–VA input range simplifies op-amp buffer design. |
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 |
|---|---|---|---|
| ADC121S021 | Same pinout and interface, but rated for 50–200 ksps; lower power (1.1 mW at 3.6 V), reduced SNR (70 dB). | Better suited for low-throughput sensor polling (e.g., temperature logging every 100 ms) where 200 ksps headroom is unnecessary. | Select ADC121S021 when system maximum sample rate ≤200 ksps and lowest possible active power is prioritized. |
| ADC121S101 | Pin/function compatible, rated for 500 ksps–1 Msps; higher power (2.5 mW at 3.6 V), identical INL/DNL, SNR 71.5 dB. | Required for real-time waveform capture (e.g., motor phase current reconstruction) demanding >500 ksps sustained throughput. | Select ADC121S101 when design requires guaranteed 1 Msps capability and can accommodate +0.8 mW additional active power. |
Compared with ADC121S021 and ADC121S101, the ADC121S051CISD/NOPB delivers optimal balance of throughput (200–500 ksps), power (1.7 mW), and noise performance (72 dB SNR) for mid-speed industrial data loggers and portable test equipment - avoiding over-specification or under-capability trade-offs.
Availability
ADC121S051CISD/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor nodes, and industrial control systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for ADC121S051CISD/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 over 50 years of innovation in precision data converters and industrial-grade ICs.
The ADC121S051CISD/NOPB belongs to TI's precision SAR ADC family designed for space- and power-constrained industrial and portable applications where 12-bit resolution, serial interface simplicity, and guaranteed performance across temperature and sample rate are mandatory.
FAQ
What is the maximum guaranteed sample rate for ADC121S051CISD/NOPB?
The ADC121S051CISD/NOPB is fully specified and guaranteed for operation up to 500 ksps across −40°C to +85°C. While functional up to 1 Msps per operating ratings, only the 200–500 ksps range ensures all AC and DC specifications (including INL, DNL, and SNR) meet published limits. For designs requiring 1 Msps with full spec compliance, ADC121S101 is the validated alternative.
Does ADC121S051CISD/NOPB require an external reference voltage?
No. The ADC121S051CISD/NOPB uses its VA supply pin as the reference - the full-scale input range is 0 V to VA. This eliminates need for external reference components, simplifying BOM and layout. However, supply noise directly impacts SNR, so proper bypassing (1 μF + 0.1 μF near VA) is mandatory to achieve the specified 72 dB typical SNR.
Is ADC121S051CISD/NOPB pin-compatible with other devices in the ADC121S family?
Yes. ADC121S051CISD/NOPB is fully pin- and function-compatible with ADC121S021 (50–200 ksps) and ADC121S101 (500 ksps–1 Msps) in the same 6-lead WSON or SOT-23 packages. This allows one PCB layout to support multiple speed grades - critical for platform-based product families targeting varying performance tiers.
What is the purpose of the three leading zero bits in ADC121S051CISD/NOPB's serial output?
The three leading zero bits in ADC121S051CISD/NOPB's SDATA stream ensure consistent 16-clock-cycle framing for each conversion result, regardless of MCU word size. They provide alignment for 16-bit SPI peripherals and simplify firmware bit-shifting - the 12 data bits follow MSB-first, enabling direct loading into a 16-bit register without masking or repositioning logic.
How does ADC121S051CISD/NOPB enter and exit shutdown mode?
ADC121S051CISD/NOPB enters shutdown mode when CS is driven high before the 10th falling edge of SCLK after conversion initiation. It exits shutdown and begins a new conversion on the next CS falling edge. Shutdown current drops to 2.6 µW at 5.25 V, and power-up time from shutdown is guaranteed ≤1 µs - enabling rapid wake-up for event-triggered sampling.
ADC121S051CISD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 6-WSON (2.2x2.5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC121S051CISD/NOPB FAQ
1.How can I place an order for ADC121S051CISD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S051CISD/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 ADC121S051CISD/NOPB reliable?
The price and inventory of ADC121S051CISD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S051CISD/NOPB is usually 5 days.
3.What payment methods are accepted for ADC121S051CISD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S051CISD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S051CISD/NOPB?
ADC121S051CISD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S051CISD/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 ADC121S051CISD/NOPB?
For technical support, including ADC121S051CISD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S051CISD/NOPB requirements.
6.How does Aetrix verify that ADC121S051CISD/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC121S051CISD/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 ADC121S051CISD/NOPB meets industry standards.
7.What is the process for return or replacement of ADC121S051CISD/NOPB?
All ADC121S051CISD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S051CISD/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 ADC121S051CISD/NOPB part is unused and in its original packaging.
Return procedure for ADC121S051CISD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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