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Texas Instruments ADS8885IDGS
- Part No.:
- ADS8885IDGS
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8885IDGS.pdf
- Description:
- IC ADC 18BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
ADS8885IDGS from Texas Instruments is an 18-bit, 400-kSPS true-differential SAR analog-to-digital converter with no latency output, 100 dB SNR, ±3.0 LSB max INL, and SPI-compatible serial interface. It operates from 2.7 V to 3.6 V AVDD and 1.65 V to 3.6 V DVDD, supporting unipolar differential input ranges from –VREF to +VREF with 90 dB min CMRR - used in precision medical instrumentation and low-power battery-operated test equipment.
For engineers reviewing the ADS8885IDGS datasheet, ADS8885IDGS pinout, ADS8885IDGS application, or ADS8885IDGS equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and two validated alternative parts - all grounded in TI's SBAS568A datasheet (Dec 2013) and official package documentation for the MSOP-10 (DGS) variant.
Technical Context
The ADS8885IDGS implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling true-differential acquisition across AINP/AINN without external signal conditioning. Its internal clock drives conversion independently of SCLK, and it supports three interface modes: 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain - all with optional busy indicator bit.
It features a unique common-mode voltage detection block allowing VCM anywhere from 0 V to VREF without performance degradation, unlike conventional differential SAR ADCs. Input sampling uses 55-pF capacitors per channel with 96-Ω series switch resistance, and full-scale settling to 18 bits occurs in 1200 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic output with no missing codes (NMC) over full temperature range. |
| Sample Rate | 400 kSPS - fixed maximum throughput; power scales linearly (2.6 mW at full rate, 65 µW at 10 kSPS). |
| SNR / THD | 100 dB / –115 dB - measured at 1 kHz, VREF = 5 V; enables high-fidelity signal capture in precision instrumentation. |
| INL / DNL | ±3.0 LSB (max) / +1.5/–1 LSB (max) - ensures accurate end-point linearity for calibration-critical applications. |
| Input Range | True-differential: –VREF to +VREF - supports direct connection to bridge sensors or isolated amplifiers without level-shifting. |
| CMRR | 90 dB (min) - maintains accuracy despite common-mode noise up to VREF, critical in noisy industrial environments. |
| Supply Range | AVDD: 2.7–3.6 V; DVDD: 1.65–3.6 V - enables dual-supply flexibility and compatibility with modern low-voltage logic. |
Pinout & Package
ADS8885IDGS is packaged in a 10-pin MSOP (DGS) with exposed thermal pad. The package requires GND connection of the thermal pad per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Reference input | Accepts 2.5–5 V external reference; must be decoupled with ≥10 µF capacitor to maintain SNR and linearity. |
| AINP / AINN | Differential analog inputs | Sampled simultaneously; support common-mode voltage 0 V to VREF with 90 dB CMRR - eliminates need for front-end biasing. |
| AVDD | Analog supply | 2.7–3.6 V; powers internal SAR core and reference buffer; requires 1-µF local decoupling to GND. |
| DVDD | Digital supply | 1.65–3.6 V; independent of AVDD; powers SPI interface and logic; requires 1-µF local decoupling. |
| GND | Common ground | Single-pin return for AVDD, DVDD, REF, and digital I/O; internal connection to REF return - mandates star grounding. |
| CONVST | Conversion start / CS | Edge-triggered start; doubles as chip select in 3-wire mode; minimum pulse width 10 ns. |
| DIN | Serial data input | Configures interface mode (3-wire/4-wire/daisy-chain) at conversion start; serves as CS in 4-wire mode. |
| DOUT | Serial data output | SPI-compatible MSB-first output; tri-state controlled by CONVST or SCLK edge depending on mode. |
| SCLK | Serial clock input | Up to 16 MHz; timing-critical for data valid windows (td-CK-DO = 13.4 ns typical). |
Key Features
| Feature | Design Value |
|---|---|
| No-latency output | Delivers conversion result immediately after completion - eliminates pipeline delay for real-time control loops. |
| True-differential input with wide VCM range | Supports 0 V to VREF common-mode voltage without gain/offset error penalty - enables direct sensor interfacing. |
| Power scaling with throughput | Dissipates only 65 µW at 10 kSPS - ideal for duty-cycled, energy-constrained portable instrumentation. |
| SPI-compatible daisy-chain mode | Allows cascading multiple ADS8885IDGS devices on single SCLK/DIN/DOUT lines - reduces MCU GPIO count in multi-channel systems. |
| Internal sample-and-hold | Integrated S/H eliminates external circuitry and timing alignment complexity - simplifies PCB layout and BOM. |
Applications
| Medical ECG Monitoring | Industrial Process Controller |
|---|---|
Use Scenario: High-resolution digitization of low-amplitude, low-frequency biopotential signals from electrode pairs. IC Role / Device Role / Timing Role: True-differential ADC capturing microvolt-level differential inputs with 100 dB SNR and 90 dB CMRR to reject 50/60 Hz mains interference. Use Value: Enables clinical-grade signal fidelity without external instrumentation amplifiers or active filtering stages. |
Use Scenario: Closed-loop feedback acquisition of analog sensor outputs (e.g., pressure, temperature, flow) in PLC I/O modules. IC Role / Device Role / Timing Role: Precision SAR ADC providing 18-bit resolution and ±3 LSB INL for accurate setpoint comparison and PID computation. Use Value: Reduces calibration drift and improves long-term measurement stability in harsh factory environments. |
| Battery-Powered Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Portable handheld multimeter or data logger requiring extended runtime and high DC accuracy. IC Role / Device Role / Timing Role: Low-power ADC consuming 65 µW at 10 kSPS while maintaining ±1.5 LSB typ INL and 100 dB SNR. Use Value: Extends battery life by >3× versus comparable 16-bit converters without sacrificing DC precision. |
Use Scenario: High-speed parametric testing of semiconductor devices using synchronized multi-channel sampling. IC Role / Device Role / Timing Role: 400-kSPS SAR ADC with deterministic 1200 ns settling and no latency - enables tight timing margins in production test fixtures. Use Value: Eliminates pipeline delay uncertainty, improving test repeatability and reducing per-device test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8865IDRC | 16-bit, 400-kSPS, same MSOP-10 package; lower resolution but improved THD (–120 dB) and lower power (1.8 mW @ 400 kSPS). | Best suited for cost-sensitive applications where 16-bit resolution suffices and ultra-low distortion is prioritized over dynamic range. | Select when system SNR requirement ≤ 95 dB and budget constraints outweigh need for 18-bit quantization. |
| ADS8881IDGS | 18-bit, 1-MSPS, same DGS package; higher speed but increased power (4.2 mW @ 1 MSPS) and reduced CMRR (85 dB min). | Targeted at high-throughput applications like motor control position feedback where speed dominates over common-mode rejection. | Choose when sampling rate > 400 kSPS is mandatory and board space allows for additional thermal management. |
Compared with ADS8885IDGS, ADS8865IDRC trades 2 bits of resolution for lower power and better harmonic performance, while ADS8881IDGS doubles throughput at the expense of CMRR and quiescent dissipation - making ADS8885IDGS the optimal balance for precision, power, and noise immunity in portable and industrial sensing.
Availability
ADS8885IDGS is available at Aetrix Electronics and suitable for precision medical equipment, industrial process controllers, and battery-powered test instruments requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS8885IDGS 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 decades of expertise in precision data converters and industrial-grade IC design.
The ADS8885IDGS belongs to TI's 18-bit SAR ADC family engineered for high-accuracy, low-power, true-differential signal acquisition in portable, medical, and industrial instrumentation - emphasizing noise immunity, supply flexibility, and ease of digital integration.
FAQ
What is the absolute maximum input voltage range for AINP and AINN on the ADS8885IDGS?
The absolute maximum voltage at AINP or AINN is –0.3 V to (REF + 0.3) V, per the ADS8885IDGS absolute maximum ratings table. Exceeding this range risks ESD diode conduction and potential damage. For reliable operation, keep both inputs within –0.1 V to (VREF + 0.1) V under normal conditions, as specified in the electrical characteristics.
Does the ADS8885IDGS require an external clock source for conversion?
No - the ADS8885IDGS uses an internal conversion clock and does not require an external clock for core SAR operation. SCLK is only needed for serial data transfer. Conversion timing is governed by tconv (500–1300 ns) and tACQ (1200 ns), both internally generated. SCLK frequency up to 16 MHz controls readout speed, not conversion initiation.
Can the ADS8885IDGS operate with different analog and digital supply voltages?
Yes - the ADS8885IDGS supports independent supplies: AVDD from 2.7 V to 3.6 V and DVDD from 1.65 V to 3.6 V. This allows interfacing with 1.8-V or 3.3-V logic while powering the analog core at an optimized voltage. Both supplies must be decoupled locally with 1-µF capacitors to GND as specified in the ADS8885IDGS datasheet.
What is the purpose of the thermal pad on the ADS8885IDGS MSOP-10 package?
The exposed thermal pad on the ADS8885IDGS (DGS package) must be soldered to a PCB ground plane to ensure proper thermal dissipation and electrical stability. TI specifies θJA = 151.9°C/W for the DGS package; omitting thermal pad connection degrades thermal performance and may cause parametric drift or reliability issues under sustained 400-kSPS operation.
How does the ADS8885IDGS handle power-down between conversions?
The ADS8885IDGS automatically enters a low-power state (50 nA AVDD current) at the end of each conversion and remains powered down during the acquisition phase. This feature reduces average power consumption proportionally to throughput - e.g., 65 µW at 10 kSPS - without requiring external control signals. Full functionality resumes upon next CONVST assertion.
ADS8885IDGS 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):
- 400k
- 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:
- 1.65V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8885IDGS FAQ
1.How can I place an order for ADS8885IDGS through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8885IDGS 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 ADS8885IDGS reliable?
The price and inventory of ADS8885IDGS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8885IDGS is usually 5 days.
3.What payment methods are accepted for ADS8885IDGS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8885IDGS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8885IDGS?
ADS8885IDGS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8885IDGS 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 ADS8885IDGS?
For technical support, including ADS8885IDGS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8885IDGS requirements.
6.How does Aetrix verify that ADS8885IDGS is sourced from the original manufacturer or authorized distributors?
All ADS8885IDGS 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 ADS8885IDGS meets industry standards.
7.What is the process for return or replacement of ADS8885IDGS?
All ADS8885IDGS units undergo pre-shipment inspection (PSI). If there is an issue with ADS8885IDGS, 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 ADS8885IDGS part is unused and in its original packaging.
Return procedure for ADS8885IDGS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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