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Texas Instruments ADC122S021CIMMX/NOPB
- Part No.:
- ADC122S021CIMMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADC122S021CIMMX/NOPB.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,961
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Product details
Overview
ADC122S021CIMMX/NOPB from Texas Instruments is a 12-bit, dual-channel successive-approximation ADC with serial SPI-compatible interface, operating at 50–200 ksps sample rates, 72 dB typical SNR, and 2.2 mW power consumption at 3V - used for precision analog signal digitization in portable instrumentation and remote data acquisition systems.
For engineers reviewing the ADC122S021CIMMX/NOPB datasheet, ADC122S021CIMMX/NOPB pinout, ADC122S021CIMMX/NOPB application, or ADC122S021CIMMX/NOPB equivalent, key selection factors include its guaranteed no-missing-codes performance, channel-to-channel crosstalk of −86 dB, track-and-hold acquisition time of 3 SCLK cycles, and industrial temperature range (−40°C to +85°C) in an 8-pin VSSSOP package.
Technical Context
The ADC122S021CIMMX/NOPB implements a charge-redistribution DAC architecture with internal track-and-hold, supporting single-ended analog inputs IN1 and IN2 referenced to VA. It uses a 16-cycle serial frame (3 cycles track + 13 cycles convert/readout) synchronized to CS falling edge and SCLK.
Its control register (loaded via DIN on first 8 rising SCLK edges after CS fall) selects input channel (IN1 or IN2) using ADD0–ADD2 bits; ADD1 = 1 is invalid. Output coding is straight binary, MSB-first, compatible with SPI, QSPI, and MICROWIRE protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and full code coverage across full input range. |
| Sample Rate Range | 50 ksps to 200 ksps - fully specified over entire range, enabling flexible timing design without derating. |
| SNR | 72.0 dB (typ) at fIN = 39.9 kHz - supports >11.7 ENOB for high-fidelity signal capture in sensor interfaces. |
| INL / DNL | ±0.35 LSB (typ) / +0.4/−0.2 LSB (typ) - enables accurate multi-channel measurement with <0.1 LSB channel matching. |
| Power Consumption | 2.2 mW at 3V (typ), 0.14 µW shutdown - suitable for battery-powered systems requiring low quiescent current. |
| Analog Supply Range | +2.7 V to +5.25 V - allows direct interfacing with 3.3 V or 5 V logic and mixed-voltage systems. |
| Crosstalk | −86 dB - prevents signal coupling between IN1 and IN2 during simultaneous or interleaved sampling. |
Pinout & Package
ADC122S021CIMMX/NOPB is housed in an 8-lead VSSSOP (Very Small Outline Package) with exposed thermal pad, package code DGK, θJA = 250°C/W, and lead-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Falling edge initiates conversion frame; high state enables power-down mode (0.14 µW at 3V). |
| VA | Analog Power Supply | +2.7 V to +5.25 V supply; also serves as reference - requires local 1 µF + 0.1 µF bypassing. |
| GND | Analog Ground | Common return for analog circuitry; must be separated from digital ground for optimal noise performance. |
| SCLK | Serial Clock Input | Controls conversion timing and serial data transfer; supports 0.8–3.2 MHz clock frequency. |
| DOUT | Digital Output | MSB-first serial output of 12-bit result; tri-state when CS is high. |
| DIN | Digital Input | Loads 8-bit control register (ADD0–ADD2) on rising SCLK edges to select next input channel. |
| IN1 / IN2 | Analog Inputs | Single-ended inputs ranging 0 V to VA; multiplexed internally; input capacitance 33 pF (track) / 3 pF (hold). |
Key Features
| Feature | Design Value |
|---|---|
| Variable Power Management | Dynamic power scaling across 50–200 ksps range plus hardware shutdown (CS high) reduces idle power to sub-µW level. |
| Single-Supply Operation | Eliminates need for dual rails or external reference - VA serves as both supply and full-scale reference (1 LSB = VA/4096). |
| Pin-Compatible Family | Shares 8-pin VSSSOP footprint and register map with ADC102S021 (10-bit) and ADC082S021 (8-bit) for scalable design reuse. |
| Industrial Temperature Range | Specified from −40°C to +85°C - validated for deployment in harsh environments without derating. |
| SPI-Compatible Serial Interface | Direct connection to microcontrollers/DSPs without level-shifting or protocol translation; supports daisy-chaining via shared SCLK/CS. |
Applications
| Portable Data Loggers | Industrial Sensor Nodes |
|---|---|
Use Scenario: Battery-powered environmental monitoring units measuring temperature, pressure, and humidity over extended field deployments. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two sensor outputs per conversion cycle with 200 ksps throughput and 72 dB SNR. Use Value: Low 2.2 mW active power and 0.14 µW shutdown extend battery life; no-missing-codes guarantee ensures reliable data integrity across full operating range. | Use Scenario: Distributed I/O modules in PLC backplanes acquiring analog signals from multiple transmitters in factory automation. IC Role / Device Role / Timing Role: Precision front-end converter handling 4–20 mA loop inputs via external resistors, with channel-to-channel crosstalk <−86 dB. Use Value: Single 3.3 V supply simplifies power architecture; industrial temp rating and robust ESD protection (2500 V HBM) ensure reliability in electrically noisy plants. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Handheld diagnostic tools capturing biopotential signals (ECG, EMG) with minimal size and thermal load. IC Role / Device Role / Timing Role: High-fidelity analog front-end digitizing conditioned bio-signals at up to 200 ksps with 11.7-bit ENOB. Use Value: 72 dB SNR and −84 dB THD enable clean waveform reconstruction; small VSSSOP package saves PCB area in space-constrained enclosures. | Use Scenario: Benchtop multimeters and data acquisition systems requiring calibrated, repeatable DC and AC measurements. IC Role / Device Role / Timing Role: Reference-grade ADC providing traceable 12-bit resolution with ±0.35 LSB INL and matched channel offset error (±0.1 LSB). Use Value: Guaranteed monotonicity and tight linearity specs support metrology-grade accuracy without post-calibration trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC122S051 | Same 12-bit resolution but rated for 200–500 ksps range; higher max clock (6.4 MHz); identical pinout and control register. | Better suited for higher-throughput systems requiring >200 ksps sustained sampling without sacrificing resolution. | Select ADC122S051 when system demands faster sampling while retaining same PCB layout and firmware interface. |
| ADC102S021 | 10-bit resolution, same 50–200 ksps range, identical VSSSOP-8 package and pin mapping; lower power (1.3 mW at 3V). | Appropriate where 10-bit precision suffices and power budget is tighter, e.g., cost-sensitive consumer sensors. | Choose ADC102S021 for reduced BOM cost and lower dynamic power when 12-bit ENOB is not required. |
Compared with ADC122S021CIMMX/NOPB, ADC122S051 offers higher speed headroom within identical footprint, while ADC102S021 trades 2 bits of resolution for lower power and cost - both retain full software and layout compatibility.
Availability
ADC122S021CIMMX/NOPB is available at Aetrix Electronics and suitable for portable systems, remote data acquisition, instrumentation and control systems requiring stable component supply and long-term manufacturability.
Supply support for ADC122S021CIMMX/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 broad industrial and automotive portfolio coverage.
The ADC122S021CIMMX/NOPB belongs to TI's precision SAR ADC family designed for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems.
FAQ
What is the maximum sample rate supported by the ADC122S021CIMMX/NOPB?
The ADC122S021CIMMX/NOPB is fully specified for operation from 50 ksps to 200 ksps. Its maximum guaranteed sample rate is 200 ksps, with corresponding timing parameters (e.g., tCONV = 13 SCLK cycles, throughput = 16 SCLK cycles) validated across the full industrial temperature range and supply voltage (2.7 V to 5.25 V). Exceeding 200 ksps may degrade INL, SNR, or crosstalk performance.
Does the ADC122S021CIMMX/NOPB require an external reference voltage?
No, the ADC122S021CIMMX/NOPB does not require an external reference. It uses its analog supply voltage (VA) as the reference - full-scale range is 0 V to VA, and 1 LSB = VA/4096. This eliminates external reference components but requires clean, well-bypassed VA (1 µF + 0.1 µF capacitors within 1 cm) to maintain 72 dB SNR and low THD.
How is channel selection implemented on the ADC122S021CIMMX/NOPB?
Channel selection is controlled via the 3-bit ADD0–ADD2 field in the 8-bit control register loaded on DIN during each conversion frame. ADD0 = 0 and ADD1 = 0 selects IN1 (default); ADD0 = 1 and ADD1 = 0 selects IN2. Setting ADD1 = 1 results in indeterminate DOUT behavior and is prohibited per datasheet Table 4.
What is the power-down current of the ADC122S021CIMMX/NOPB?
The ADC122S021CIMMX/NOPB draws 38 nA typical supply current in shutdown mode at +3.6 V (0.14 µW power consumption), and 60 nA at +5.25 V (0.32 µW). Shutdown is activated automatically when CS is held high, and the device resumes conversion on the next CS falling edge with no wake-up delay or dummy cycles required.
Is the ADC122S021CIMMX/NOPB pin-compatible with other devices in its family?
Yes, the ADC122S021CIMMX/NOPB is fully pin- and function-compatible with ADC102S021 (10-bit) and ADC082S021 (8-bit), as confirmed in Table 1 of the SNAS280D datasheet. All share identical 8-pin VSSSOP package (DGK), pin assignments, control register structure, and serial timing - enabling resolution-scaling without PCB redesign.
ADC122S021CIMMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-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:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC122S021CIMMX/NOPB FAQ
1.How can I place an order for ADC122S021CIMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC122S021CIMMX/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 ADC122S021CIMMX/NOPB reliable?
The price and inventory of ADC122S021CIMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC122S021CIMMX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC122S021CIMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC122S021CIMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC122S021CIMMX/NOPB?
ADC122S021CIMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC122S021CIMMX/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 ADC122S021CIMMX/NOPB?
For technical support, including ADC122S021CIMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC122S021CIMMX/NOPB requirements.
6.How does Aetrix verify that ADC122S021CIMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC122S021CIMMX/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 ADC122S021CIMMX/NOPB meets industry standards.
7.What is the process for return or replacement of ADC122S021CIMMX/NOPB?
All ADC122S021CIMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC122S021CIMMX/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 ADC122S021CIMMX/NOPB part is unused and in its original packaging.
Return procedure for ADC122S021CIMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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