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Texas Instruments ADC121S101CISD/NOPB
- Part No.:
- ADC121S101CISD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
ADC121S101CISD/NOPB.pdf
- Description:
- IC ADC 12BIT SAR 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,453
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Product details
Overview
ADC121S101CISD/NOPB from Texas Instruments is a single-channel, 12-bit successive-approximation ADC with SPI-compatible serial interface, specified for 500 ksps to 1 Msps sample rates over −40°C to 125°C. It operates from a single 2.7 V to 5.25 V supply, delivers ±0.4 LSB INL (typ), +0.5/−0.3 LSB DNL (typ), and achieves 72 dB SINAD at 100 kHz input - used in automotive sensor signal conditioning and portable instrumentation front-ends.
For engineers reviewing the ADC121S101CISD/NOPB datasheet, ADC121S101CISD/NOPB pinout, ADC121S101CISD/NOPB application, or ADC121S101CISD/NOPB equivalent, key selection considerations include guaranteed performance across full sample-rate range (not just one point), low-power shutdown mode (2.6 µW at 5 V), WSON-6 package compatibility with space-constrained PCBs, and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The ADC121S101CISD/NOPB implements a charge-redistribution SAR architecture with integrated track-and-hold, enabling precise sampling of analog inputs up to 11 MHz full-power bandwidth (at 5 V). Its conversion timing is fully synchronous to SCLK, requiring exactly 16 falling edges to output 12 data bits preceded by three leading zeros in straight binary format.
It supports SPI™, QSPI™, MICROWIRE, and common DSP serial protocols via dedicated CS, SCLK, and SDATA pins. Power management is controlled solely by CS: pulling CS high between the 2nd and 10th SCLK falling edge forces shutdown mode, reducing supply current to 500 nA (fSCLK = 0 MHz) while maintaining full rail-to-rail input range (0 V to VA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function across full temperature range. |
| Sample Rate Range | 500 ksps to 1 Msps - fully specified performance across entire range, not extrapolated. |
| INL | ±0.4 LSB (typ) at −40°C to 85°C - limits end-point error in precision measurement systems. |
| DNL | +0.5 / −0.3 LSB (typ) - ensures absence of code-width anomalies affecting histogram linearity. |
| Power (3 V) | 2 mW (typ) in normal mode - enables battery-powered operation with minimal thermal load. |
| Power (5 V) | 10 mW (typ) in normal mode; 2.6 µW in shutdown - supports dynamic throughput/power trade-offs. |
| SINAD | 72 dB (typ) at fIN = 100 kHz - defines usable dynamic range for medium-bandwidth sensor signals. |
| Input Range | 0 V to VA - simplifies biasing with single-supply op-amp drivers without level-shifting. |
Pinout & Package
ADC121S101CISD/NOPB is supplied in a 6-pin WSON package (2.50 mm × 2.20 mm, 0.5 mm pitch) with exposed thermal pad. The center pad must be connected to GND for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VA | Positive analog supply | Must be bypassed with 1-µF + 0.1-µF capacitors within 1 cm; powers internal reference and core logic. |
| 2 - GND | Analog/digital ground return | Common reference for all analog and digital signals; connects to exposed thermal pad. |
| 3 - VIN | Analog input | Rail-to-rail capable (0 V to VA); input capacitance is 30 pF in track mode - requires low-Z driver. |
| 4 - SCLK | Serial clock input | Controls conversion timing and data readout; accepts 10–20 MHz clocks; duty cycle 40–60%. |
| 5 - SDATA | Serial data output | Three leading zero bits + 12-bit straight binary MSB-first; tri-stated when CS is high. |
| 6 - CS | Chip select | Falling edge initiates conversion; high during 2nd–10th SCLK edge forces shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for automotive applications operating from −40°C to +125°C ambient. |
| Variable power management | CS-controlled shutdown reduces supply current to 500 nA - enables microamp-level system sleep states. |
| SPI/QSPI/MICROWIRE compatible | Direct interface with standard microcontroller peripherals - no protocol translation required. |
| Specified over full sample-rate range | INL, DNL, SINAD, and timing guaranteed from 500 ksps to 1 Msps - eliminates derating uncertainty. |
| Single 2.7–5.25 V supply | Eliminates dual-rail design complexity; supports direct connection to 3.3 V or 5 V logic domains. |
| Internal track-and-hold | Enables accurate sampling of fast-changing signals without external hold circuitry. |
Applications
| Automotive Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Reading thermistor, pressure transducer, or position sensor outputs in engine control units or ADAS modules. IC Role / Device Role / Timing Role: Precision analog front-end digitizer with AEC-Q100 qualification and wide temperature operation. Use Value: Delivers ±0.4 LSB INL stability across −40°C to 125°C, enabling reliable calibration without software compensation. |
Use Scenario: Battery-powered environmental monitoring node acquiring temperature, humidity, and light levels. IC Role / Device Role / Timing Role: Low-power, single-supply ADC minimizing system BOM count and PCB area. Use Value: 2 mW typical power at 3 V and 2.6 µW shutdown enable >1-year battery life in intermittent-sampling deployments. |
| Industrial Process Controller | Medical Instrumentation Front-End |
Use Scenario: Digitizing 4–20 mA loop signals or RTD bridge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: High-linearity SAR converter interfacing directly with precision op-amp signal chains. Use Value: 72 dB SINAD and 11.6 ENOB support 10-bit effective resolution for industrial-grade accuracy. |
Use Scenario: Signal acquisition in portable ECG or pulse oximeter devices requiring compact, low-noise ADCs. IC Role / Device Role / Timing Role: Compact WSON-6 ADC with rail-to-rail input and minimal external components. Use Value: 2.50 mm × 2.20 mm footprint and 0.5 mm pitch simplify high-density medical PCB layout. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 ksps max, no AEC-Q100 rating, SO-8 package | Limited to lower-accuracy consumer or non-automotive industrial use | Select only if resolution and automotive qualification are not required. |
| ADS8320EB | 16-bit resolution, 100 ksps, SPI interface, SO-8, no shutdown mode | Higher precision but lower speed and fixed power consumption | Choose when ENOB >12 bits is mandatory and throughput ≤100 ksps suffices. |
Compared with ADS7822U and ADS8320EB, ADC121S101CISD/NOPB uniquely balances 12-bit linearity, 1-Msps throughput, AEC-Q100 Grade 1 compliance, and ultra-low shutdown power - making it optimal for automotive and portable systems demanding both precision and power agility.
Availability
ADC121S101CISD/NOPB is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data loggers, and industrial process controllers requiring stable component supply and long-term lifecycle support.
Supply support for ADC121S101CISD/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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and automotive-grade ICs.
The ADC121S101CISD/NOPB belongs to TI's precision SAR ADC product line, designed specifically for cost-sensitive, space-constrained applications needing guaranteed performance across wide temperature and sample-rate ranges - especially in automotive and portable instrumentation.
FAQ
What is the maximum guaranteed sample rate for ADC121S101CISD/NOPB?
The ADC121S101CISD/NOPB is fully specified for operation up to 1 Msps across its entire temperature range (−40°C to 125°C). This maximum rate is guaranteed when using an SCLK frequency of 20 MHz and observing the minimum CS-to-CS timing of 1000 ns, as defined in the timing requirements table of the datasheet. At lower SCLK frequencies, the achievable throughput scales linearly.
Does ADC121S101CISD/NOPB require an external reference voltage?
No, ADC121S101CISD/NOPB uses an internal reference derived from the VA supply and does not require an external reference. Its full-scale range is 0 V to VA, and all specifications - including INL and DNL - are referenced to this supply-based scale. This eliminates need for precision external references and reduces BOM count.
How is shutdown mode activated on ADC121S101CISD/NOPB?
Shutdown mode is activated by pulling the CS pin high between the 2nd and 10th falling edge of SCLK after initiating a conversion. Doing so aborts the current conversion, places SDATA in high-impedance state, and reduces supply current to 500 nA (at fSCLK = 0 MHz). The device remains in shutdown until CS is pulled low again to start a new conversion.
Is ADC121S101CISD/NOPB pin-compatible with other members of the ADC121S family?
Yes, ADC121S101CISD/NOPB is fully pin- and function-compatible with ADC121S021 and ADC121S051, differing only in specified sample-rate range (50–200 ksps and 200–500 ksps respectively). All share identical WSON-6 and SOT-23-6 footprints, pin functions, and serial interface behavior - enabling drop-in upgrades based on speed requirements.
What package type is used for ADC121S101CISD/NOPB?
ADC121S101CISD/NOPB is packaged in a 6-pin WSON (Wafer-Level Small Outline No-Lead) package with nominal dimensions of 2.50 mm × 2.20 mm and 0.5 mm pitch. It includes an exposed thermal pad that TI specifies must be connected to GND for proper thermal dissipation and electrical performance.
ADC121S101CISD/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):
- 1M
- 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 ~ 125°C
- Supplier Device Package:
- 6-WSON (2.2x2.5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC121S101CISD/NOPB FAQ
1.How can I place an order for ADC121S101CISD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S101CISD/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 ADC121S101CISD/NOPB reliable?
The price and inventory of ADC121S101CISD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S101CISD/NOPB is usually 5 days.
3.What payment methods are accepted for ADC121S101CISD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S101CISD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S101CISD/NOPB?
ADC121S101CISD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S101CISD/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 ADC121S101CISD/NOPB?
For technical support, including ADC121S101CISD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S101CISD/NOPB requirements.
6.How does Aetrix verify that ADC121S101CISD/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC121S101CISD/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 ADC121S101CISD/NOPB meets industry standards.
7.What is the process for return or replacement of ADC121S101CISD/NOPB?
All ADC121S101CISD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S101CISD/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 ADC121S101CISD/NOPB part is unused and in its original packaging.
Return procedure for ADC121S101CISD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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