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Texas Instruments ADS8881CDGS
- Part No.:
- ADS8881CDGS
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8881CDGS.pdf
- Description:
- IC ADC 18BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,060
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Product details
Overview
ADS8881CDGS from Texas Instruments is an 18-bit, 1-MSPS, true-differential SAR analog-to-digital converter with SPI-compatible serial interface, 90 dB minimum CMRR, ±2.0 LSB max INL, and 100 dB SNR at 1 kHz - deployed in precision instrumentation and battery-powered medical sensors requiring high-resolution, low-latency digitization of differential analog signals.
For engineers reviewing the ADS8881CDGS datasheet, ADS8881CDGS pinout, ADS8881CDGS application, or ADS8881CDGS equivalent, this page delivers verified technical context, validated pin functions, confirmed AC/DC performance specs, real-world use-value per application, and two rigorously cross-checked alternative parts - all grounded in TI's SBAS547D production data sheet (Rev D, August 2015).
Technical Context
The ADS8881CDGS implements a successive-approximation register (SAR) architecture with no pipeline latency, enabling deterministic conversion timing (500–710 ns tconv) and full-scale step settling to 18 bits in 290 ns. Its true-differential input accepts –VREF to +VREF swing while supporting common-mode voltage from 0 V to VREF - independent of AVDD and DVDD supplies.
It supports three SPI-compatible interface modes: 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain - all synchronized to SCLK up to 70 MHz. Power dissipation scales linearly with throughput: 5.5 mW at 1 MSPS, 0.55 mW at 100 kSPS, and 55 µW at 10 kSPS, with 50 nA AVDD power-down current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 distinct output codes for sub-ppm-level measurement fidelity. |
| Sample Rate | 1 MSPS - enables real-time capture of signals up to 500 kHz Nyquist bandwidth. |
| INL (max) | ±2.0 LSB - ensures monotonicity and < ±0.0076% full-scale error across temperature. |
| SNR | 100 dB at 1 kHz - corresponds to ~16.6 effective number of bits (ENOB) under ideal conditions. |
| CMRR (min) | 90 dB - rejects >99.988% of common-mode interference within 0 V to VREF range. |
| Power @ 1 MSPS | 5.5 mW - achieves 5.5 µW per sample, critical for portable, thermally constrained systems. |
| Reference Range | 2.5 V to 5 V - allows flexible signal scaling without external gain stages or level shifting. |
Pinout & Package
VSSOP-10 (DGS) package: 3.00 mm × 3.00 mm body, exposed thermal pad not present (unlike VSON-10), surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP (Pin 3) | Noninverting analog input | Accepts true-differential signal; must remain within –0.1 V to VREF + 0.1 V for valid operation. |
| AINN (Pin 4) | Inverting analog input | Paired with AINP; differential span = AINP – AINN = –VREF to +VREF. |
| REF (Pin 1) | Positive reference input | External 2.5–5 V reference; decoupled with ≥10 µF capacitor; independent of AVDD/DVDD. |
| AVDD (Pin 2) | Analog supply | 2.7–3.6 V analog rail; requires 1-µF decoupling to GND; powers internal SAR core and reference buffer. |
| GND (Pin 5) | Common ground | Shared return for AVDD, DVDD, and REF; internal connection to reference return path. |
| CONVST (Pin 6) | Convert start / chip select | Edge-triggered conversion initiation; doubles as CS in 3-wire mode; min pulse width = 10 ns. |
| DOUT (Pin 7) | Serial data output | SPI-compatible MSB-first output; data valid on SCLK falling edge; 3-state controlled by CONVST/DIN. |
| SCLK (Pin 8) | Serial clock input | Up to 70 MHz; defines timing for DIN sampling and DOUT output; duty cycle 45–55%. |
| DIN (Pin 9) | Serial data input | Mode selection at conversion start; serves as CS in 4-wire mode; setup time = 7.5 ns to CONVST rising edge. |
| DVDD (Pin 10) | Digital supply | 2.7–3.6 V (SCLK > 40 MHz) or 1.65–3.6 V (SCLK < 40 MHz); powers digital I/O only; independent of AVDD. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency output | Zero-cycle pipeline delay ensures deterministic timing - critical for closed-loop control and time-of-flight measurements. |
| True-differential input | Supports –VREF to +VREF differential swing with 0 V to VREF common-mode range - eliminates need for external instrumentation amplifiers in noise-prone environments. |
| Daisy-chain capability | Enables cascading multiple ADS8881 devices on single SPI bus - reduces MCU GPIO count and simplifies multi-channel synchronization. |
| Scalable power consumption | Draws only 55 µW at 10 kSPS - extends battery life in portable diagnostics and handheld test equipment without sacrificing resolution. |
| High CMRR (90 dB min) | Maintains accuracy in presence of EMI or ground bounce - essential for industrial sensor interfaces and medical EEG/ECG front ends. |
Applications
| Automatic Test Equipment (ATE) | Instrumentation and Process Controls |
|---|---|
Use Scenario: High-speed parametric testing of semiconductor devices requiring precise voltage/current digitization at 1 MSPS. IC Role / Device Role / Timing Role: Primary ADC capturing analog stimulus responses with deterministic 500–710 ns conversion time and no latency. Use Value: 18-bit resolution and ±2.0 LSB INL ensure pass/fail decisions meet Class A metrology standards without post-processing calibration. |
Use Scenario: Analog monitoring of pressure, flow, and temperature transducers in PLC I/O modules operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: True-differential front-end digitizer rejecting common-mode noise from motor drives and switching power supplies. Use Value: 90 dB CMRR and 100 dB SNR enable stable 16+ ENOB performance even with long sensor cables and unshielded wiring. |
| Precision Medical Equipment | Low-Power, Battery-Operated Instruments |
Use Scenario: Digitizing low-amplitude bio-signals (e.g., EEG, EMG) in portable diagnostic devices where signal integrity and DC accuracy are paramount. IC Role / Device Role / Timing Role: High-linearity ADC providing 18-bit NMC output with ±1.2 LSB typical INL and < 1 µV/°C offset drift. Use Value: Unipolar true-differential input accommodates bipolar biopotentials without external level-shifting circuitry, reducing BOM and board area. |
Use Scenario: Portable multimeter or handheld oscilloscope requiring extended runtime from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Ultra-low-power ADC dynamically scaling from 5.5 mW (1 MSPS) down to 55 µW (10 kSPS) based on measurement demand. Use Value: 50 nA power-down current preserves battery charge during idle periods - enabling months of standby operation between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8861IDRCT | 16-bit, 1-MSPS, true-differential SAR; lower resolution but identical VSSOP-10 footprint and SPI interface. | Lower dynamic range (93 dB SNR vs 100 dB); suitable when 16-bit ENOB suffices and cost reduction is prioritized. | Select ADS8861IDRCT if system-level SNR requirements are ≤95 dB and BOM cost optimization is critical. |
| ADS8885IPW | 18-bit, 500 kSPS, true-differential SAR; same architecture and INL spec (±2 LSB), but halved throughput and TSSOP-16 package. | Slower acquisition (tACQ = 420 ns vs 290 ns); better suited for lower-bandwidth, higher-channel-count systems with PCB space for larger package. | Choose ADS8885IPW when throughput >1 MSPS is unnecessary and thermal management favors larger package footprint. |
Compared with ADS8881CDGS, ADS8861IDRCT trades 2 bits of resolution and 7 dB SNR for lower unit cost and identical pinout, while ADS8885IPW retains full 18-bit fidelity at half the speed and in a physically larger package - offering distinct trade-offs in resolution, speed, thermal profile, and layout compatibility.
Availability
ADS8881CDGS is available at Aetrix Electronics and suitable for automatic test equipment, precision instrumentation, medical diagnostics, and portable measurement instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADS8881CDGS 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 and embedded processing technologies, with over 90 years of innovation in precision data converters and industrial-grade ICs.
The ADS8881CDGS belongs to TI's ADS88xx family of ultra-low-power, high-resolution SAR ADCs - engineered specifically for battery-constrained, noise-sensitive applications demanding 18-bit accuracy without latency or missing codes.
FAQ
What is the maximum SCLK frequency supported by the ADS8881CDGS?
The ADS8881CDGS supports SCLK frequencies up to 70 MHz in all interface modes (3-wire, 4-wire, and daisy-chain), as specified in Section 8.6 of the SBAS547D datasheet. This allows high-speed serial data transfer while maintaining timing margins - for example, completing an 18-bit read in under 260 ns. The ADS8881CDGS maintains full functionality and AC performance at this rate when DVDD ≥ 2.7 V and ambient temperature remains within its rated range.
Does the ADS8881CDGS require an external reference, and what voltage range is supported?
Yes, the ADS8881CDGS requires an external precision reference applied to the REF pin, supporting 2.5 V to 5 V - independently of AVDD and DVDD supply voltages. This flexibility enables direct interfacing with references like REF5045 or REF2925 without level-shifting. The device specifies 300 µA typical reference input current during conversion and requires ≥10 µF decoupling capacitance at the REF pin to maintain stability and noise performance.
What is the operating temperature range for the ADS8881CDGS variant?
The ADS8881CDGS is the commercial-grade variant, rated for operation from 0°C to +70°C ambient temperature. This distinguishes it from the ADS8881IDGS (industrial grade, –40°C to +85°C). Both variants share identical electrical specifications, pinout, and package dimensions - only the temperature qualification differs. System designs targeting extended environmental ranges must select the 'I' suffix version.
How does the ADS8881CDGS achieve true-differential input operation?
The ADS8881CDGS accepts true-differential analog inputs on AINP and AINN pins, with a full-scale range of –VREF to +VREF. Its input structure allows any common-mode voltage between 0 V and VREF - provided both inputs stay within –0.1 V to VREF + 0.1 V. This eliminates the need for external differential amplifiers or level shifters in applications such as bridge sensor interfaces or isolated current sensing, directly digitizing bipolar signals with inherent noise rejection.
Can the ADS8881CDGS be used in daisy-chain configuration, and how many devices can be cascaded?
Yes, the ADS8881CDGS supports daisy-chain operation via its SPI-compatible interface - allowing multiple devices to share one SCLK and CONVST line while using a single DOUT line routed serially (DOUT₁ → DIN₂ → DOUT₂ → DIN₃, etc.). The datasheet confirms functional validation for multi-device chains; practical limits depend on SCLK rise/fall times and trace capacitance, but systems with 4–8 devices are routinely implemented. No additional control logic or glue logic is required beyond proper signal routing and timing margining.
ADS8881CDGS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8881CDGS FAQ
1.How can I place an order for ADS8881CDGS through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8881CDGS 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 ADS8881CDGS reliable?
The price and inventory of ADS8881CDGS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8881CDGS is usually 5 days.
3.What payment methods are accepted for ADS8881CDGS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8881CDGS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8881CDGS?
ADS8881CDGS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8881CDGS 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 ADS8881CDGS?
For technical support, including ADS8881CDGS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8881CDGS requirements.
6.How does Aetrix verify that ADS8881CDGS is sourced from the original manufacturer or authorized distributors?
All ADS8881CDGS 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 ADS8881CDGS meets industry standards.
7.What is the process for return or replacement of ADS8881CDGS?
All ADS8881CDGS units undergo pre-shipment inspection (PSI). If there is an issue with ADS8881CDGS, 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 ADS8881CDGS part is unused and in its original packaging.
Return procedure for ADS8881CDGS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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