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Texas Instruments ADS8568SRGCT
- Part No.:
- ADS8568SRGCT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
ADS8568SRGCT.pdf
- Description:
- IC ADC 16BIT SAR 64VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
ADS8568SRGCT 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 510 kSPS parallel / 400 kSPS serial data rate-designed for high-accuracy industrial power monitoring and protection relay systems.
For engineers reviewing the ADS8568SRGCT datasheet, ADS8568SRGCT pinout, ADS8568SRGCT application, or ADS8568SRGCT equivalent, key selection considerations include simultaneous sampling across four channel pairs, programmable ±2 VREF / ±4 VREF input ranges up to ±12 V, auto-sleep mode for low-power operation at 10 kSPS (32 mW), and dual interface support (parallel/serial with daisy-chain capability).
Technical Context
The ADS8568SRGCT implements eight independent SAR ADCs grouped into four synchronized channel pairs (A–D), each supporting simultaneous conversion triggered by dedicated CONVST_x signals. Its internal 10-bit string DAC enables programmable reference output from 0.5 V to 3.0 V, directly supporting analog input ranges up to ±12 V without external scaling.
It operates in hardware mode (pin-strapped configuration) or software mode (via 32-bit CONFIG register), with configurable interface timing, selectable SDO outputs (SDO_A–SDO_D), and flexible power management including ASLEEP and STBY control-fully specified from –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR architecture delivering 91.5 dB SNR and –94 dB THD for high-fidelity signal capture in power quality analysis. |
| Sampling Rate | 510 kSPS per channel (parallel interface) or 400 kSPS (serial interface), enabling real-time acquisition of fast transients in protection relays. |
| Input Range | Programmable ±2 VREF or ±4 VREF (up to ±12 V with 3-V reference), supporting direct connection to isolated current/voltage sensor outputs. |
| Reference | Internal 10-bit DAC-tuned reference (0.5–3.0 V), eliminating need for external precision reference ICs in space-constrained designs. |
| Power Consumption | 32 mW at 10 kSPS in auto-sleep mode; full-rate power dissipation is 275 mW (HVDD = 15 V, AVDD = 5 V, DVDD = 3.3 V). |
| Temperature Range | –40°C to +125°C industrial grade operation, validated across full range with no derating required. |
| Interface Options | Selectable parallel (16-bit bus) or serial (SPI-compatible) with daisy-chain support for multi-ADC synchronization without FPGA logic overhead. |
Pinout & Package
ADS8568SRGCT is housed in a 64-pin VQFN package (9.0 mm × 9.0 mm, 0.5-mm pitch) with exposed thermal pad for enhanced thermal performance in high-density industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH_A0, CH_A1 | Analog input pair A | Master channel pair; must run at highest data rate when mixed-rate sampling is used; supports ±12 V input via programmable RANGE control. |
| CONVST_A–D | Dedicated conversion start inputs | Enable independent or synchronized sampling across four channel pairs-critical for phase-aligned voltage/current capture in 3-phase motor control. |
| DB0–DB15 / SDO_A–SDO_D | Data I/O (parallel) or serial output | Parallel mode: 16-bit bidirectional bus; serial mode: four independent SDO pins allow concurrent readout of all eight channels without multiplexing delay. |
| REFIO, REFN, REFAP/AN, etc. | Reference I/O and decoupling terminals | Separate reference buffer inputs per channel pair minimize crosstalk; REFIO serves as DAC-controlled reference output or external reference input. |
| ASLEEP, STBY, RESET | Power and reset control | ASLEEP enables automatic low-power hold after conversion; STBY powers down entire device including clock and reference; RESET clears CONFIG register and aborts conversions. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling across 8 channels | Four independent channel pairs (A–D) acquire synchronized samples with <100 ps aperture delay matching-enabling accurate phasor calculation in power analyzers. |
| Programmable internal reference | 10-bit DAC (0.5–3.0 V range) eliminates external reference ICs and reduces BOM count while maintaining ±10 ppm/°C drift over temperature. |
| Dual interface flexibility | Hardware-selectable parallel or serial mode with daisy-chain capability allows scalable system expansion from single to multiple ADS8568SRGCT devices using same PCB footprint. |
| Auto-sleep power optimization | Reduces power to 32 mW at 10 kSPS by automatically entering hold mode six tCCLK cycles after CONVST assertion-ideal for burst-mode data logging in PLCs. |
| True bipolar input architecture | Direct ±12 V input support without external op-amp level-shifting simplifies front-end design for CT/PT sensor interfaces in protection relays. |
Applications
| Protection Relays | Power Quality Measurement |
|---|---|
Use Scenario: Real-time detection of fault currents and voltages during grid disturbances with sub-cycle response time. IC Role / Device Role / Timing Role: Simultaneous sampling of three-phase voltage and current pairs ensures coherent phasor estimation for IEC 61850-compliant trip decision logic. Use Value: 91.5 dB SNR and <100 ps inter-pair aperture matching enable accurate harmonic analysis up to 50th order under transient conditions. | Use Scenario: Continuous monitoring of voltage sags, swells, flicker, and harmonic distortion in industrial substations. IC Role / Device Role / Timing Role: 16-bit resolution and –94 dB THD preserve spectral integrity for IEEE 519-compliant harmonic measurements across 50/60 Hz fundamental and higher orders. Use Value: Programmable ±12 V input range accepts direct output from isolation amplifiers, avoiding gain error and noise introduced by external signal conditioning. |
| Multi-Axis Motor Controls | Programmable Logic Controllers |
Use Scenario: Closed-loop torque and flux control in servo drives requiring synchronized current sensing across U/V/W phases and rotor position feedback. IC Role / Device Role / Timing Role: Four channel pairs (A–D) sample motor phase currents and encoder signals simultaneously-eliminating time-skew errors in field-oriented control algorithms. Use Value: Dedicated CONVST inputs per pair allow staggered or fully synchronized acquisition, supporting both high-bandwidth current loops and lower-rate position tracking on same device. | Use Scenario: Modular I/O modules in distributed control systems requiring high-accuracy analog input for process variables (temperature, pressure, flow). IC Role / Device Role / Timing Role: Parallel interface provides deterministic low-latency readout for hard real-time scan cycles; serial mode enables compact wiring in space-constrained DIN-rail enclosures. Use Value: Auto-sleep mode cuts idle power by >80% versus continuous conversion, extending thermal margin in fanless PLC backplanes operating at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8548SRGCT | 14-bit resolution, 85 dB SNR, 600 kSPS (PAR), identical pinout and software compatibility. | Lower resolution suitable for cost-sensitive motor drives where 16-bit dynamic range is not required for torque ripple suppression. | Select when SNR >90 dB is unnecessary and system BOM cost reduction is prioritized over ultimate measurement fidelity. |
| AD7606BSTZ | 16-bit, 8-channel, but uses charge redistribution SAR; fixed ±10 V input range; no internal reference DAC; SPI-only interface. | Lacks programmable reference and dual interface-requires external reference and parallel-to-SPI bridge for legacy parallel bus systems. | Choose only if existing design already uses AD7606 pinout/layout and reference architecture; not drop-in compatible due to missing REFIO/REFBUFEN functionality. |
Compared with ADS8548SRGCT, the ADS8568SRGCT delivers 6.5 dB higher SNR and extended input range flexibility, justifying its use in premium power analytics; versus AD7606BSTZ, it offers superior integration (internal reference DAC, dual interface, auto-sleep) but requires layout revision due to non-identical pin mapping and enhanced thermal management.
Availability
ADS8568SRGCT is available at Aetrix Electronics and suitable for protection relays, power quality analyzers, and multi-axis motor control systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for ADS8568SRGCT 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 signal chain solutions.
The ADS85x8 family-including ADS8568SRGCT-is designed specifically for high-accuracy, simultaneous-sampling applications in harsh industrial environments, emphasizing robustness, configurability, and system-level integration.
FAQ
What is the maximum sampling rate of the ADS8568SRGCT in parallel interface mode?
The ADS8568SRGCT achieves a maximum data rate of 510 kSPS per channel when configured for parallel interface operation. This rate is guaranteed across the full –40°C to +125°C temperature range and supports simultaneous sampling across all eight channels using dedicated CONVST_A–D inputs. The parallel bus uses DB0–DB15 for 16-bit bidirectional data transfer with RD, WR, CS, and PAR/SER control signals.
Does the ADS8568SRGCT require an external reference voltage?
No, the ADS8568SRGCT includes an integrated 10-bit string DAC that generates a programmable internal reference from 0.5 V to 3.0 V, accessible via the REFIO pin. When REFEN is asserted (via REFEN/WR pin or CONFIG bit C15), the internal reference buffers are enabled and the DAC output becomes active-eliminating the need for external reference ICs in most applications. An external reference can still be applied at REFIO if higher precision or different voltage is required.
How does the auto-sleep mode function in the ADS8568SRGCT?
The ADS8568SRGCT auto-sleep mode activates six conversion clock (tCCLK) cycles after a CONVST_x signal initiates conversion. In this state, the device enters hold mode, reducing power consumption to 32 mW at 10 kSPS. It exits sleep automatically upon next CONVST assertion. This behavior is controlled by the ASLEEP pin (active-high) and is especially useful in burst-acquisition systems like portable power analyzers where low average power is critical.
Can the ADS8568SRGCT interface with an FPGA using serial communication?
Yes, the ADS8568SRGCT supports SPI-compatible serial communication with configurable clock polarity and phase. When PAR/SER = 1, it uses DB9/SDI (data in), DB10/SCLK (clock), DB15/SDO_D (data out), and optional FS (frame sync). Daisy-chain capability allows multiple ADS8568SRGCT devices to share one SPI bus-reducing FPGA pin count and simplifying synchronization in multi-channel acquisition systems.
What package type is used for the ADS8568SRGCT, and what are its thermal characteristics?
The ADS8568SRGCT is supplied in a 64-pin VQFN package (RGC suffix) measuring 9.0 mm × 9.0 mm with an exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 22°C/W, and junction-to-board (RθJB) is 3.6°C/W-enabling reliable operation at full speed in industrial environments up to +125°C ambient when mounted on a 2-layer PCB with adequate copper pour and thermal vias under the pad.
ADS8568SRGCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad
- 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-VQFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8568SRGCT FAQ
1.How can I place an order for ADS8568SRGCT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8568SRGCT 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 ADS8568SRGCT reliable?
The price and inventory of ADS8568SRGCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8568SRGCT is usually 5 days.
3.What payment methods are accepted for ADS8568SRGCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8568SRGCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8568SRGCT?
ADS8568SRGCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8568SRGCT 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 ADS8568SRGCT?
For technical support, including ADS8568SRGCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8568SRGCT requirements.
6.How does Aetrix verify that ADS8568SRGCT is sourced from the original manufacturer or authorized distributors?
All ADS8568SRGCT 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 ADS8568SRGCT meets industry standards.
7.What is the process for return or replacement of ADS8568SRGCT?
All ADS8568SRGCT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8568SRGCT, 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 ADS8568SRGCT part is unused and in its original packaging.
Return procedure for ADS8568SRGCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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