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Analog Devices Inc. AD7863ARS-3REEL
- Part No.:
- AD7863ARS-3REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7863ARS-3REEL.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
AD7863ARS-3REEL from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) with ±2.5 V input range, 5.2 μs conversion time, and single 5 V supply operation. It integrates two track-and-hold amplifiers, internal 2.5 V reference, and high-speed parallel interface - enabling phase-coherent acquisition in motor control and power quality monitoring systems.
For engineers reviewing the AD7863ARS-3REEL datasheet, AD7863ARS-3REEL pinout, AD7863ARS-3REEL application, or AD7863ARS-3REEL equivalent, key selection criteria include simultaneous dual-channel sampling capability, aperture delay matching ≤350 ps, channel-to-channel isolation of −86 dB, and support for 175 kSPS throughput in Mode 1 operation.
Technical Context
The AD7863ARS-3REEL implements two independent successive approximation register (SAR) ADCs sharing a common CONVST trigger and BUSY status signal. Each ADC uses a dedicated track-and-hold amplifier with 7 MHz small-signal bandwidth and 35 ns maximum aperture delay, ensuring precise phase alignment between VA1/VA2 or VB1/VB2 pairs.
It operates in two modes: high-speed Mode 1 (5.2 μs conversion, 175 kSPS) and auto-power-down Mode 2 (10.0 μs effective conversion, 105 μW max standby). Input scaling is fixed per variant: AD7863ARS-3REEL supports only ±2.5 V bipolar input range with twos-complement output coding and 3 kΩ input resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Conversion Time | 5.2 μs (Mode 1) - enables 175 kSPS sustained sampling rate per channel without pipeline latency. |
| Analog Input Range | ±2.5 V - matches standard signal processing levels; supports overvoltage tolerance up to ±7 V without damage. |
| Channel Isolation | −86 dB - minimizes crosstalk between Channel A and B during simultaneous acquisition of differential signals. |
| Aperture Delay Matching | ≤350 ps - preserves sub-degree phase coherence between sampled VA1/VA2 or VB1/VB2 waveforms. |
| Power Dissipation | 70 mW typical (Mode 1), 105 μW max (Mode 2) - enables use in thermally constrained or battery-backed data loggers. |
| Reference Source | Internal 2.5 V ±10 mV (25°C), 25 ppm/°C TC - eliminates need for external reference in cost-sensitive industrial designs. |
Pinout & Package
AD7863ARS-3REEL is housed in a 28-lead SSOP (Shrink Small Outline Package) with 0.635 mm lead pitch and exposed thermal pad. The package is RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA1, VA2 | Channel A analog inputs | Accept ±2.5 V differential pair; sampled simultaneously on CONVST falling edge. |
| VB1, VB2 | Channel B analog inputs | Alternate input pair selected via A0; identical electrical specs to VA1/VA2. |
| CONVST | Convert Start input | Edge-triggered control: falling edge initiates simultaneous hold and conversion on both channels. |
| BUSY | Status output | Active-high open-drain signal indicates conversion in progress; goes low when results are ready. |
| A0 | Multiplexer select | Static logic input determining whether VA1/VA2 (A0 = low) or VB1/VB2 (A0 = high) are converted. |
| CS, RD | Parallel interface controls | Standard TTL-compatible chip select and read strobe for 14-bit data bus (DB0–DB13). |
| VREF | Reference I/O | 2.5 V output (buffered) or input; internal reference enabled by default; 5.5 kΩ source impedance limits external loading. |
| AGND, DGND | Analog/digital ground | Separate ground pins required for optimal SNR; must be connected at single point on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Preserves phase relationship between VA1/VA2 or VB1/VB2 inputs - critical for vector motor control and power factor analysis. |
| Internal 2.5 V reference | Eliminates external reference component while maintaining ±10 mV accuracy at 25°C and 25 ppm/°C drift - reduces BOM count and layout area. |
| Overvoltage protection | Withstands ±7 V on analog inputs without latch-up or parametric shift - simplifies front-end protection design in noisy industrial environments. |
| Auto power-down mode | Reduces quiescent current to 20 μA max after conversion completes - extends battery life in portable measurement equipment. |
| High-speed parallel interface | 14-bit TTL-compatible bus with <35 ns CONVST pulse width and <45 ns RD pulse width - interfaces directly with legacy microcontrollers and DSPs. |
Applications
| Motor Control Feedback | Power Quality Monitoring |
|---|---|
Use Scenario: Real-time acquisition of phase currents and back-EMF voltages in three-phase PMSM drives. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling ADC capturing synchronized VA1/VA2 (current/voltage) pairs at 175 kSPS to compute torque ripple and field orientation. Use Value: 350 ps aperture delay matching ensures <0.1° phase error at 1 kHz fundamental - enabling precise FOC algorithm execution. |
Use Scenario: Detection of harmonics, interharmonics, and transient events in utility-grade energy meters. IC Role / Device Role / Timing Role: Simultaneous digitization of voltage and current waveforms across multiple phases using time-aligned VA1/VB1 pairs. Use Value: −86 dB channel isolation prevents cross-phase contamination during THD and intermodulation distortion measurements per IEC 61000-4-7. |
| Industrial Data Acquisition | Test & Measurement Equipment |
Use Scenario: High-fidelity logging of sensor outputs (strain gauges, accelerometers) in structural health monitoring systems. IC Role / Device Role / Timing Role: Dual 14-bit ADC providing correlated time-domain samples for FFT-based spectral analysis and modal identification. Use Value: 78 dB SNR at 80 kHz input frequency meets Class A accuracy requirements for IEEE 1057-compliant digitizers. |
Use Scenario: Embedded digitizer module in portable oscilloscopes and signal analyzers requiring compact, low-power ADC subsystems. IC Role / Device Role / Timing Role: Core sampling engine delivering 175 kSPS dual-channel data to FPGA-based decimation and display pipeline. Use Value: 70 mW typical power dissipation allows integration into fanless handheld instruments without thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7656ASTZ | 6-channel, 16-bit SAR ADC; 3.5 μs conversion; requires external reference; higher power (110 mW) | Supports more input channels but lacks integrated ±2.5 V scaling - needs external op-amp gain stages for same input range. | Choose when higher resolution (16-bit) and multi-channel count outweigh board space and power constraints. |
| ADS8556IPMR | 6-channel, 16-bit simultaneous-sampling ADC; 1.25 MSPS; 3.3 V supply; SPI interface only | No parallel interface; incompatible with legacy 80C196/MC68000 buses; requires FPGA or microcontroller with SPI master support. | Prefer when migrating to modern digital interfaces and higher throughput is mandatory, accepting redesign of host interface logic. |
Compared with AD7863ARS-3REEL, AD7656ASTZ offers greater channel density and resolution but increases system complexity with external reference and scaling; ADS8556IPMR delivers higher speed and resolution but abandons the parallel bus - making AD7863ARS-3REEL optimal for cost-sensitive, space-constrained industrial controllers retaining legacy MCU interfaces.
Availability
AD7863ARS-3REEL is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, and industrial data acquisition requiring stable component supply across extended product lifecycles.
Supply support for AD7863ARS-3REEL 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7863 family was designed specifically for real-time, phase-critical acquisition in industrial automation and energy systems - emphasizing simultaneous sampling integrity, robust overvoltage tolerance, and seamless integration with legacy parallel-bus microcontrollers.
FAQ
What is the input voltage range supported by the AD7863ARS-3REEL?
The AD7863ARS-3REEL supports a bipolar analog input range of ±2.5 V, optimized for signal processing applications. This range is factory-configured and not user-selectable; overvoltage protection allows transient excursions up to ±7 V without damage. Input resistance is specified at 3 kΩ, and the device uses twos-complement output coding for this variant. The AD7863ARS-3REEL does not support ±10 V or 0 V to 2.5 V ranges - those require AD7863-10 or AD7863-2 variants respectively.
How does the AD7863ARS-3REEL achieve simultaneous sampling across two channels?
The AD7863ARS-3REEL achieves true simultaneous sampling using two matched track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same instant, freezing their respective input voltages (e.g., VA1 and VA2) with ≤350 ps aperture delay matching. This preserves relative phase information between sampled signals - a requirement verified in the datasheet's dynamic specifications and essential for vector control and power analysis. Conversion proceeds in parallel within the same 5.2 μs window.
Can the AD7863ARS-3REEL operate with an external reference?
Yes, the AD7863ARS-3REEL can operate with an external 2.5 V reference applied to the VREF pin, though its internal 2.5 V reference is enabled by default. When using the internal reference, two 0.1 μF ceramic capacitors must be placed from VREF to AGND. External references must meet ±0.5% initial accuracy and <10 ppm/°C drift to avoid degrading the AD7863ARS-3REEL's specified gain error (±8 LSB max). Reference errors directly translate to full-scale gain errors in the AD7863ARS-3REEL output.
What are the timing requirements for reading conversion results from the AD7863ARS-3REEL?
After BUSY goes low, the first RD pulse reads the result from VA1 (if A0 = low) or VB1 (if A0 = high); the second RD pulse reads VA2 or VB2. Minimum RD pulse width is 45 ns, with 30 ns minimum data access time after RD falling edge. Consecutive reads require ≥10 ns spacing, and a 400 ns quiet period must precede the next CONVST pulse to ensure valid acquisition. These timings are validated under load conditions defined in Figure 3 of the AD7863ARS-3REEL datasheet.
Is the AD7863ARS-3REEL pin-compatible with other AD7863 variants?
Yes, the AD7863ARS-3REEL is pin-compatible with AD7863-10 and AD7863-2 in the same SSOP package - all share identical pinout, interface signaling, and timing. However, input range, output coding (twos-complement vs. straight binary), and input resistance differ between variants. No PCB changes are required when substituting among AD7863 variants, but firmware must be updated to handle different full-scale ranges and code formats. The AD7863ARS-3REEL specifically uses twos-complement coding for its ±2.5 V range.
AD7863ARS-3REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 175k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7863ARS-3REEL FAQ
1.How can I place an order for AD7863ARS-3REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7863ARS-3REEL 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 AD7863ARS-3REEL reliable?
The price and inventory of AD7863ARS-3REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7863ARS-3REEL is usually 5 days.
3.What payment methods are accepted for AD7863ARS-3REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7863ARS-3REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7863ARS-3REEL?
AD7863ARS-3REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7863ARS-3REEL 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 AD7863ARS-3REEL?
For technical support, including AD7863ARS-3REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7863ARS-3REEL requirements.
6.How does Aetrix verify that AD7863ARS-3REEL is sourced from the original manufacturer or authorized distributors?
All AD7863ARS-3REEL 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 AD7863ARS-3REEL meets industry standards.
7.What is the process for return or replacement of AD7863ARS-3REEL?
All AD7863ARS-3REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7863ARS-3REEL, 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 AD7863ARS-3REEL part is unused and in its original packaging.
Return procedure for AD7863ARS-3REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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