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Texas Instruments ADS8568SPMR
- Part No.:
- ADS8568SPMR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
ADS8568SPMR.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
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Product details
Overview
ADS8568SPMR from Texas Instruments is a 16-bit, 8-channel simultaneous-sampling SAR ADC with true bipolar inputs, 91.5 dB SNR, –94 dB THD, and selectable parallel/serial interface supporting up to 510 kSPS per channel in parallel mode. It operates across –40°C to +125°C and supports ±12 V input ranges via programmable internal reference, targeting high-accuracy industrial power monitoring systems.
For engineers reviewing the ADS8568SPMR datasheet, ADS8568SPMR pinout, ADS8568SPMR application, or ADS8568SPMR equivalent, key selection considerations include simultaneous sampling integrity across four channel pairs, auto-sleep power scaling (32 mW at 10 kSPS), hardware/software configuration modes, and dual-package availability (64-pin VQFN or LQFP) with verified thermal performance (RθJA = 22°C/W for VQFN).
Technical Context
The ADS8568SPMR implements eight independent SAR ADCs grouped into four synchronized channel pairs (A–D), each with dedicated analog front-end references (REFAP/AN, REFDP/DN, etc.) and individual CONVST_x control lines enabling flexible staggered or fully simultaneous acquisition. Its internal 10-bit string DAC configures reference output from 0.5 V to 3.0 V with ±10 ppm/°C drift.
It supports two operational modes: hardware mode (pin-strapped configuration) and software mode (register-based control via CONFIG register), with configurable interface (PAR/SER), range selection (±2× or ±4× VREF), daisy-chain capability, and auto-sleep activation via ASLEEP pin or STBY bit - all validated over full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 15.3 µV at ±12 V full-scale range, enabling sub-0.0015% measurement precision |
| Max Data Rate (Parallel) | 510 kSPS per channel - supports real-time capture of 160 kHz sinusoidal signals with ≥5× oversampling |
| Signal-to-Noise Ratio | 91.5 dB typical - ensures >65,536 effective resolution bits (ENOB ≈ 15.0 bits) at DC–100 kHz |
| Total Harmonic Distortion | –94 dB typical - maintains spectral purity critical for harmonic analysis in power quality meters |
| Input Voltage Range | Programmable ±2× or ±4× VREF (up to ±12 V) - eliminates external signal conditioning for legacy industrial sensor interfaces |
| Reference Output | 2.5 V or 3.0 V, 10-bit DAC-tuned, ±10 ppm/°C drift - enables stable calibration without external voltage references |
| Operating Temperature | –40°C to +125°C - qualified for deployment in protection relays and motor drives exposed to harsh ambient conditions |
| Power Consumption | 32 mW at 10 kSPS (auto-sleep mode) - reduces thermal load and system cooling requirements in dense PCB layouts |
Pinout & Package
ADS8568SPMR is available in a 64-pin VQFN package (9.0 mm × 9.0 mm, 7.3 mm × 7.3 mm body with exposed thermal pad), optimized for thermal dissipation (RθJA = 22°C/W) and high-density routing in industrial data acquisition modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH_A0 / CH_A1 | Analog input pair A | Master channel pair; must run at highest data rate when channel groups operate asynchronously |
| CONVST_A–D | Digital input (active-high) | Independent conversion triggers per channel pair; rising edge initiates simultaneous sampling on associated CH_x[1:0] |
| REFAP / REFAN, REFDP / REFDN, etc. | Analog reference decoupling terminals | Dedicated pins per channel pair for low-noise reference bypassing; require 4.7–10 µF capacitors to AGND |
| DB0–DB15 / SDO_A–SDO_D | Parallel data bus or serial daisy-chain outputs | Configurable 16-bit parallel output or four independent serial outputs (SDO_A–D) with SEL_B/SEL_CD control |
| ASLEEP / STBY / RESET | Power management controls | Hardware pins for immediate low-power entry (ASLEEP), full shutdown (STBY), or register reset (RESET ≥50 ns pulse) |
| HW/SW / PAR/SER | Configuration mode select | Two-pin encoding determines whether device behavior is defined by external pins (HW) or internal CONFIG register (SW) |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling across 8 channels | Four matched channel pairs (A–D) acquire synchronized samples with <100 ps aperture delay matching - essential for phase-accurate multi-phase power measurements |
| Programmable internal reference | 10-bit DAC tunes REFIO from 0.5 V to 3.0 V with ±0.1 LSB INL; supports ±12 V input without external op-amps or level shifters |
| Selectably buffered reference outputs | REFBUFEN pin or CONFIG bit C14 enables/disables internal buffers - allows direct connection to REF_xP/N pins while maintaining <10 ppm gain error |
| Dual-interface flexibility | Single device supports parallel (16-bit bus, 510 kSPS) or serial (daisy-chainable SDO_A–D, 400 kSPS) operation - simplifies migration between throughput- and space-constrained designs |
| Auto-sleep power optimization | Reduces power to 32 mW at 10 kSPS by gating internal clock and hold circuitry six tCCLK cycles after CONVST - cuts idle consumption by >70% vs. continuous operation |
| Extended temperature qualification | Full electrical specs guaranteed from –40°C to +125°C - meets IEC 61850-3 and UL 508 industrial environmental requirements |
Applications
| Protection Relays | Power Quality Analyzers |
|---|---|
Use Scenario: Real-time detection of overcurrent, undervoltage, and phase-angle faults in medium-voltage distribution networks. IC Role / Device Role / Timing Role: Simultaneous sampling of three-phase voltage and current (six channels) plus auxiliary signals (two channels) with <100 ps inter-pair skew ensures accurate sequence component calculation. Use Value: 91.5 dB SNR and –94 dB THD enable reliable fault classification at <0.1% fundamental amplitude, meeting IEEE C37.118.1a synchrophasor accuracy class P. |
Use Scenario: Continuous monitoring of voltage flicker, harmonics (up to 50th), and interharmonics in commercial building substations. IC Role / Device Role / Timing Role: 16-bit resolution and 510 kSPS parallel throughput capture 10-cycle windows (500 ms @ 50 Hz) with 100 kSPS effective sampling per channel for FFT bin resolution ≤0.5 Hz. Use Value: Programmable ±12 V input range accepts direct connection to CT/PT secondaries without attenuation, reducing BOM count and signal chain error accumulation. |
| Multi-Axis Servo Drives | Programmable Logic Controllers (PLCs) |
Use Scenario: Closed-loop current and position feedback acquisition across 4 motor axes in CNC machine tools. IC Role / Device Role / Timing Role: Four channel pairs (A–D) independently triggered via CONVST_A–D allow staggered sampling aligned to PWM switching edges, minimizing torque ripple. Use Value: Auto-sleep mode reduces average power to 32 mW during idle motion segments - extends thermal margin in compact drive enclosures. |
Use Scenario: High-fidelity analog input modules for modular PLC backplanes requiring 8 synchronized channels per slot. IC Role / Device Role / Timing Role: Hardware-mode operation (HW/SW = 0) enables deterministic timing via external CONVST and RANGE pins - eliminates firmware dependency for scan-cycle synchronization. Use Value: 64-pin VQFN package fits standard 25 mm module pitch; RθJA = 22°C/W allows conduction-cooled mounting without heatsinks in IP20-rated cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8548IPMR | 14-bit resolution, 85 dB SNR, 600 kSPS (PAR), identical pinout and software compatibility | Limited to Class A power quality (IEC 61000-4-30 Ed. 3) due to lower ENOB; insufficient for synchrophasor P-class | Choose when cost sensitivity outweighs need for 16-bit dynamic range and harmonic analysis depth |
| AD7606C-16BSTZ | 16-bit, 1 MSPS, integrated analog front-end (PGA, anti-alias filter), SPI-only interface, different pinout | Requires PCB redesign; lacks independent CONVST per pair but offers on-chip filtering for noisy industrial environments | Prefer when board space is constrained and analog signal conditioning overhead must be minimized |
Compared with ADS8548IPMR, ADS8568SPMR delivers 6.5 dB higher SNR and 3 LSB greater resolution for demanding metrology; versus AD7606C-16BSTZ, it retains pin/software compatibility within TI's ADS85x8 family but requires external signal conditioning for anti-aliasing.
Availability
ADS8568SPMR is available at Aetrix Electronics and suitable for protection relays, power quality analyzers, and multi-axis motor controls requiring stable component supply across extended product lifecycles and industrial temperature operation.
Supply support for ADS8568SPMR 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 industrial-grade ICs.
The ADS85x8 product line was designed specifically for high-reliability, simultaneous-sampling applications in energy infrastructure - emphasizing noise immunity, temperature stability, and configurability across protection, measurement, and control subsystems.
FAQ
What is the maximum sampling rate per channel for ADS8568SPMR in parallel interface mode?
The ADS8568SPMR achieves a maximum data rate of 510 kSPS per channel when configured in parallel interface mode. This specification is validated across the full operating temperature range (–40°C to +125°C) and enables accurate capture of signals up to 160 kHz with sufficient Nyquist margin. The ADS8568SPMR maintains this rate while delivering 91.5 dB SNR and –94 dB THD, confirming its suitability for high-fidelity industrial waveform acquisition.
Does ADS8568SPMR support true simultaneous sampling across all eight channels?
Yes, ADS8568SPMR supports true simultaneous sampling across all eight channels by grouping them into four matched pairs (A–D), each with dedicated sample-and-hold circuits and independent CONVST_x inputs. Aperture delay matching is specified at ≤100 ps across all pairs when triggered synchronously, ensuring phase coherence required for vector calculations in protection relays and power analyzers. This capability is intrinsic to the ADS8568SPMR silicon architecture and does not rely on external timing alignment.
Can ADS8568SPMR operate with an external reference, or is the internal reference mandatory?
The ADS8568SPMR supports both internal and external reference configurations. When REFEN/WR is high in hardware mode or CONFIG bit C15 = 1 in software mode, the internal 2.5 V or 3.0 V reference is enabled and tunable via the 10-bit REFDAC. Alternatively, an external reference (0.5 V–3.025 V) can be applied directly to the REFIO pin with REFEN/WR low or C15 = 0. The ADS8568SPMR's reference input resistance (100 MΩ) and low input current (1 µA) ensure minimal loading on precision external sources.
What package options are available for ADS8568SPMR, and how do they differ thermally?
The ADS8568SPMR is offered in two RoHS-compliant packages: 64-pin VQFN (RGC, 9.0 mm × 9.0 mm) and 64-pin LQFP (PM, 10.0 mm × 10.0 mm). The VQFN variant features an exposed thermal pad and achieves RθJA = 22°C/W, while the LQFP yields RθJA = 48.5°C/W. Both packages are rated for –40°C to +125°C operation, but the VQFN's superior thermal performance makes it preferred for high-throughput, high-ambient-temperature applications such as enclosed motor drives where heat dissipation is critical.
How does the auto-sleep mode function in ADS8568SPMR, and what power savings does it provide?
The ADS8568SPMR auto-sleep mode reduces power consumption to 32 mW at 10 kSPS by disabling internal clock generation and hold circuitry six conversion clock cycles after a CONVST_x assertion. Activation is controlled via the ASLEEP pin (high = sleep enabled) or CONFIG bit C25 (STBY). This feature cuts active power by >70% compared to continuous operation, extending thermal headroom in space-constrained industrial modules without compromising conversion integrity upon wake-up.
ADS8568SPMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8568SPMR FAQ
1.How can I place an order for ADS8568SPMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8568SPMR 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 ADS8568SPMR reliable?
The price and inventory of ADS8568SPMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8568SPMR is usually 5 days.
3.What payment methods are accepted for ADS8568SPMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8568SPMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8568SPMR?
ADS8568SPMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8568SPMR 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 ADS8568SPMR?
For technical support, including ADS8568SPMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8568SPMR requirements.
6.How does Aetrix verify that ADS8568SPMR is sourced from the original manufacturer or authorized distributors?
All ADS8568SPMR 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 ADS8568SPMR meets industry standards.
7.What is the process for return or replacement of ADS8568SPMR?
All ADS8568SPMR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8568SPMR, 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 ADS8568SPMR part is unused and in its original packaging.
Return procedure for ADS8568SPMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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