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Texas Instruments ADC121S021CISD/NOPB
- Part No.:
- ADC121S021CISD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
ADC121S021CISD/NOPB.pdf
- Description:
- IC ADC 12BIT SAR 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,875
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Product details
Overview
ADC121S021CISD/NOPB from Texas Instruments is a single-channel, 12-bit successive-approximation ADC with internal track-and-hold, serial SPI-compatible interface, 50–200 ksps sample rate range, and operation from 2.7 V to 5.25 V supply. It delivers 72.3 dB SNR (typ), ±0.45 LSB INL (typ), and 1.5 mW power at 3.6 V - used in portable instrumentation for precision analog sensor digitization.
For engineers reviewing the ADC121S021CISD/NOPB datasheet, ADC121S021CISD/NOPB pinout, ADC121S021CISD/NOPB application, or ADC121S021CISD/NOPB equivalent, key selection considerations include guaranteed performance across full 50–200 ksps range, ultra-low shutdown power (2.6 µW), SOT-23-6/WSON-6 package options, SPI/QSPI/MICROWIRE compatibility, and industrial temperature support (–40°C to +85°C).
Technical Context
The ADC121S021CISD/NOPB implements a charge-redistribution SAR architecture with integrated track-and-hold, enabling precise sampling without external hold circuitry. Its conversion timing is fully synchronized to the SCLK falling edge, and it supports variable throughput via CS-controlled normal/shutdown mode transitions.
It uses straight binary output coding, requires no external reference (uses VA as reference), and features TRI-STATE SDATA with programmable quiet time (tQUIET = 50 ns) to prevent bus contention. Power management is controlled solely by CS level - high = shutdown (2.6 µW), low = active (1.5–7.9 mW depending on supply and sample rate).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement systems. |
| Sample Rate Range | 50–200 ksps - fully specified across entire range, eliminating interpolation uncertainty in variable-rate applications. |
| INL / DNL (typ) | ±0.45 LSB / +0.45/–0.25 LSB - enables <12-bit effective accuracy without calibration in industrial sensor interfaces. |
| SNR (typ) | 72.3 dBFS at 100 kHz input - supports >11.7 ENOB for high-fidelity signal capture in portable data loggers. |
| Supply Voltage | 2.7 V to 5.25 V - allows direct interfacing with 3.3 V or 5 V microcontrollers and battery-powered systems. |
| Power (3.6 V) | 1.5 mW active, 2.6 µW shutdown - enables duty-cycled operation in energy-constrained remote sensors. |
| Interface | SPI/QSPI/MICROWIRE/DSP-compatible serial - simplifies host integration with standard MCU peripheral drivers. |
Pinout & Package
ADC121S021CISD/NOPB is available in 6-pin SOT-23 (DBV) and 6-pin WSON (NGF) packages. The CISD suffix denotes SOT-23-6 with exposed thermal pad (recommended grounded). Both packages share identical pinout and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA | Analog power supply | Single 2.7–5.25 V supply serving as reference and analog rail; requires local 1-µF + 0.1-µF bypassing within 1 cm. |
| GND | Analog/digital ground return | Common ground for all supplies and signals; must be low-impedance to minimize noise coupling into SAR core. |
| VIN | Analog input | 0–VA unipolar input range; internal ESD diodes limit safe overvoltage to GND–0.3 V / VA+0.3 V. |
| CS | Chip select / mode control | Falling edge initiates conversion; high state forces shutdown mode (2.6 µW); timing determines normal vs. shutdown entry. |
| SCLK | Serial clock input | Controls conversion timing and data readout; 1–4 MHz range; falling edges clock out 12-bit result plus 3 leading zeros. |
| SDATA | Serial data output | TRI-STATE output delivering straight-binary 12-bit word MSB-first on SCLK falling edges; enters high-Z after 16th edge. |
Key Features
| Feature | Design Value |
|---|---|
| Full-range sample rate specification | Performance guaranteed from 50 ksps to 200 ksps - eliminates derating assumptions and enables flexible firmware-controlled throughput. |
| Variable power management | CS-driven shutdown reduces power to 2.6 µW; enables microcontroller-governed duty cycling for multi-year battery life. |
| SPI-compatible serial interface | Native support for SPI, QSPI, MICROWIRE, and common DSP protocols - avoids glue logic or custom driver development. |
| Internal track-and-hold | Eliminates need for external sample-hold circuitry - reduces BOM count and PCB area in compact sensor nodes. |
| Industrial temperature range | Specified operation from –40°C to +85°C - ensures reliability in outdoor instrumentation, factory automation, and automotive cabin modules. |
Applications
| Portable Data Loggers | Remote Sensor Nodes |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over weeks using intermittent sampling. IC Role / Device Role: Primary analog front-end ADC converting conditioned sensor outputs to digital for MCU processing and wireless transmission. Use Value: 2.6 µW shutdown power extends battery life; 50–200 ksps flexibility allows adaptive sampling; SOT-23-6 footprint minimizes board space. |
Use Scenario: Wireless industrial vibration sensors mounted on motors or pumps, transmitting FFT-based diagnostics periodically. IC Role / Device Role: High-fidelity digitizer capturing accelerometer waveforms prior to on-device spectral analysis. Use Value: 72.3 dB SNR preserves signal integrity for accurate frequency-domain analysis; SPI interface simplifies connection to low-power Cortex-M0+ MCUs. |
| Programmable Logic Controllers | Test & Measurement Front Ends |
Use Scenario: Modular I/O cards in PLCs acquiring analog process signals (4–20 mA, 0–10 V) with configurable update rates. IC Role / Device Role: Channel-isolated ADC per analog input, interfaced via SPI to FPGA or ARM-based controller. Use Value: Guaranteed INL/DNL across full sample rate range ensures consistent accuracy regardless of scan rate; 2.7–5.25 V supply accommodates diverse backplane voltages. |
Use Scenario: Handheld multimeters and portable oscilloscopes requiring compact, low-noise digitization of DC/AC signals up to 100 kHz. IC Role / Device Role: Core acquisition ADC feeding real-time display and storage subsystems. Use Value: 11.7-bit ENOB and 85 dB SFDR enable clean waveform reconstruction; straight-binary output simplifies firmware math operations. |
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, 2.7–5.25 V supply, SPI interface, no shutdown mode. | Limited to lower-accuracy applications (e.g., basic threshold detection); lacks power-down capability for battery use. | Select only when 8-bit resolution suffices and continuous operation is acceptable. |
| ADS8320EB | 16-bit resolution, 100 ksps max, 2.7–5.25 V, SPI, 12 mW active power, no shutdown mode. | Higher precision but lower speed and higher power; not suitable for duty-cycled or high-throughput designs. | Choose for metrology-grade accuracy where throughput ≤100 ksps and power budget allows. |
Compared with ADS7822U and ADS8320EB, ADC121S021CISD/NOPB uniquely balances 12-bit precision, 200 ksps maximum throughput, sub-µW shutdown power, and full-range specification - making it optimal for portable, battery-aware, medium-accuracy data acquisition systems.
Availability
ADC121S021CISD/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor networks, and industrial PLC analog input modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ADC121S021CISD/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 ADC121S021CISD/NOPB belongs to TI's precision SAR ADC product line, engineered for low-power, high-accuracy analog sensing in space- and energy-constrained applications such as portable test equipment and distributed industrial monitoring.
FAQ
What is the maximum guaranteed sample rate for ADC121S021CISD/NOPB?
The ADC121S021CISD/NOPB is fully specified from 50 ksps to 200 ksps - meaning all electrical characteristics (INL, DNL, SNR, etc.) are guaranteed across this entire range. At 200 ksps, it achieves 72.3 dB SNR (typ) and ±0.45 LSB INL (typ) with 3.6 V supply. Performance remains valid up to the absolute maximum clock frequency of 4 MHz.
Does ADC121S021CISD/NOPB require an external voltage reference?
No, ADC121S021CISD/NOPB uses its VA supply pin as the reference voltage - eliminating need for external reference components. The analog input VIN ranges from 0 V to VA, and LSB size equals VA/4096. This simplifies design and reduces cost in systems where supply rail stability meets accuracy requirements.
How does power-down mode work on ADC121S021CISD/NOPB?
ADC121S021CISD/NOPB enters shutdown mode when CS is held high; power drops to 2.6 µW (at 5.25 V). To resume operation, pull CS low - the first conversion after power-up is invalid, but the second is fully specified. This behavior enables precise microcontroller-controlled duty cycling without external power switches.
Is ADC121S021CISD/NOPB compatible with standard SPI controllers?
Yes, ADC121S021CISD/NOPB supports SPI, QSPI, MICROWIRE, and common DSP serial protocols. It outputs straight-binary 12-bit data MSB-first on SDATA, clocked by SCLK falling edges, with CS framing each conversion. No mode bits or configuration registers are required - it operates as a true SPI slave device.
What package options are available for ADC121S021CISD/NOPB?
ADC121S021CISD/NOPB is offered in two RoHS-compliant packages: 6-pin SOT-23 (DBV, body size 2.90 mm × 1.60 mm) and 6-pin WSON (NGF, 2.50 mm × 2.20 mm). The CISD/NOPB suffix specifically denotes the SOT-23 variant with exposed thermal pad, recommended to be connected to GND for optimal thermal performance.
ADC121S021CISD/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):
- 200k
- 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:
- -
ADC121S021CISD/NOPB FAQ
1.How can I place an order for ADC121S021CISD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC121S021CISD/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 ADC121S021CISD/NOPB reliable?
The price and inventory of ADC121S021CISD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC121S021CISD/NOPB is usually 5 days.
3.What payment methods are accepted for ADC121S021CISD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC121S021CISD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC121S021CISD/NOPB?
ADC121S021CISD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC121S021CISD/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 ADC121S021CISD/NOPB?
For technical support, including ADC121S021CISD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC121S021CISD/NOPB requirements.
6.How does Aetrix verify that ADC121S021CISD/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC121S021CISD/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 ADC121S021CISD/NOPB meets industry standards.
7.What is the process for return or replacement of ADC121S021CISD/NOPB?
All ADC121S021CISD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC121S021CISD/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 ADC121S021CISD/NOPB part is unused and in its original packaging.
Return procedure for ADC121S021CISD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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