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Analog Devices Inc. AD7863ARS-3
- Part No.:
- AD7863ARS-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7863ARS-3.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,464
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Product details
Overview
AD7863ARS-3 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) operating from a single 5 V supply. It delivers 175 kSPS throughput per channel with 5.2 μs conversion time, ±2.5 V input range, and integrated 2.5 V reference - designed for precision phase-coherent acquisition in motor control and power quality monitoring.
For engineers reviewing the AD7863ARS-3 datasheet, AD7863ARS-3 pinout, AD7863ARS-3 application, or AD7863ARS-3 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), channel-to-channel isolation (−86 dB), and parallel interface timing compliance with microcontrollers such as ADSP-2100 and MC68000.
Technical Context
The AD7863ARS-3 integrates two independent successive approximation ADCs, each paired with a track-and-hold amplifier and sharing a common internal 2.5 V reference. Its dual-channel architecture enables true simultaneous sampling of VA1/VA2 or VB1/VB2 via A0 multiplexer select, preserving inter-channel phase integrity for dynamic signal analysis.
Conversion is initiated by a falling edge on CONVST, triggering both track/holds into hold mode and starting concurrent conversions. BUSY remains high for 5.2 μs (Mode 1), after which results are read sequentially over a 14-bit parallel bus using CS and RD strobes - first access returns VA1/VB1, second returns VA2/VB2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonicity and no missing codes across full temperature range. |
| Sampling Rate | 175 kSPS per channel - supports real-time capture of signals up to ~87.5 kHz (Nyquist-limited). |
| Input Range | ±2.5 V - optimized for signal processing applications requiring bipolar dynamic range without external scaling. |
| Conversion Time | 5.2 μs - enables maximum throughput while maintaining DC accuracy (±2 LSB relative accuracy) and dynamic performance (77 dB SNR). |
| Aperture Delay Matching | 350 ps max - ensures sub-degree phase alignment between channels at 50 kHz, critical for vector control and FFT-based analysis. |
| Channel Isolation | −86 dB - minimizes crosstalk during simultaneous acquisition of differential or adjacent sensor signals. |
| Power Dissipation | 70 mW typical (16 mA @ 5 V) - suitable for embedded systems with thermal constraints; drops to 105 μW in power-down mode. |
| Overvoltage Tolerance | ±7 V on analog inputs - protects against transient surges without external clamping circuitry. |
Pinout & Package
AD7863ARS-3 is housed in a 28-lead SOIC_W (Wide) package with standard 0.3-inch body width and 0.025-inch lead pitch. Pin layout supports compact PCB routing for analog/digital partitioning and includes dedicated AGND/DGND pins for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VA1, VA2, VB1, VB2 | Analog Input Pairs | Four differential-capable inputs grouped into two simultaneously sampled channels (A/B); ±2.5 V range with 3 kΩ input resistance. |
| CONVST | Convert Start Trigger | Falling-edge–activated global control signal that places both track/holds into hold and initiates dual-channel conversion. |
| BUSY | Conversion Status Flag | Active-high open-drain output indicating conversion progress; goes low 5.2 μs after CONVST fall, enabling precise read timing. |
| A0 | Multiplexer Select | Static logic input determining active channel pair: low = VA1/VA2, high = VB1/VB2 - sampled at CONVST edge. |
| CS, RD | Parallel Interface Controls | Standard TTL-compatible chip select and read strobe; enable sequential 14-bit data reads (DB0–DB13) without wait states. |
| VREF | Reference I/O | 2.5 V nominal internal reference output (±10 mV @ 25°C); can be overdriven by external reference for improved stability. |
| AGND, DGND | Separate Ground Returns | Dedicated analog and digital ground pins - must be connected at single point to minimize noise coupling into conversion path. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two independent track/hold amplifiers acquire VA1/VA2 or VB1/VB2 at identical instants - preserves phase relationship for vector calculations. |
| Tight Aperture Matching | 350 ps max delay mismatch between channels - enables <0.1° phase error at 50 kHz, essential for servo feedback and power metering. |
| Integrated Reference | On-chip 2.5 V bandgap reference (25 ppm/°C TC) eliminates need for external reference IC in cost-sensitive designs. |
| Overvoltage Protection | Withstands ±7 V on analog inputs without damage - reduces requirement for external TVS or series resistors in industrial environments. |
| Low-Power Operation | 70 mW typical active power and 105 μW max sleep mode - extends battery life in portable test equipment and field sensors. |
| Lead-Compatible Upgrade | Pins and timing compatible with AD7862 - allows drop-in migration to higher resolution (14-bit vs. 12-bit) without layout changes. |
Applications
| Motor Control Feedback | Power Quality Monitoring |
|---|---|
|
Use Scenario: Real-time acquisition of current and voltage waveforms in three-phase inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous sampling of VA1 (phase A current) and VA2 (phase A voltage) preserves instantaneous power calculation accuracy. Use Value: 350 ps aperture matching ensures <0.1° phase error at 50 Hz, directly improving torque ripple suppression and efficiency. |
Use Scenario: Capturing harmonics and transients in utility-grade power analyzers for IEEE 519 compliance reporting. IC Role / Device Role / Timing Role: Dual-channel synchronized sampling of line-to-line voltage and neutral current enables coherent FFT bin alignment. Use Value: −86 dB channel isolation prevents harmonic leakage between voltage and current paths, improving THD measurement fidelity. |
| Industrial Data Acquisition | Test & Measurement Equipment |
|
Use Scenario: Multi-sensor monitoring in PLC analog input modules for vibration, temperature, and pressure. IC Role / Device Role / Timing Role: Time-aligned sampling of VA1 (accelerometer) and VB1 (thermocouple) enables cross-domain correlation analysis. Use Value: 175 kSPS throughput supports oversampling for noise reduction while maintaining deterministic latency for closed-loop response. |
Use Scenario: Digitizing dual-channel oscilloscope front-ends requiring matched gain and phase response. IC Role / Device Role / Timing Role: Simultaneous hold-and-convert operation eliminates skew-induced waveform distortion in Lissajous displays. Use Value: 5.2 μs conversion time enables >190 kSPS effective sampling rate when interleaved with processor read cycles. |
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 |
|---|---|---|---|
| AD7863ARZ-3 | Same die, 28-lead SOIC_N package (narrow body, 0.3-inch width); identical electrical specs and pinout except mechanical footprint. | Preferred for legacy board layouts using standard SOIC-N footprints; requires PCB land pattern revision from SOIC_W. | Select AD7863ARZ-3 only if SOIC_N mounting is required; AD7863ARS-3 offers better thermal dissipation (θJA = 71.4°C/W vs. 85°C/W). |
| AD7656ASTZ | 6-channel, 16-bit SAR ADC with 250 kSPS/channel; uses serial LVDS interface instead of parallel; no internal reference (requires external 2.5 V). | Suitable for higher-resolution, multi-channel systems where board space permits complex interface logic and external reference design. | Choose AD7656ASTZ when >14-bit resolution and >2 channels are needed; AD7863ARS-3 remains optimal for cost-sensitive dual-channel 14-bit designs with minimal support components. |
Compared with AD7863ARZ-3, AD7863ARS-3 provides superior thermal performance in high-density layouts; compared with AD7656ASTZ, it delivers simpler integration via parallel interface and lower BOM count due to integrated reference - making AD7863ARS-3 the preferred choice for deterministic dual-channel acquisition at 175 kSPS.
Availability
AD7863ARS-3 is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, and industrial data acquisition requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for AD7863ARS-3 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 belongs to Analog Devices' precision data acquisition portfolio, engineered specifically for applications demanding simultaneous sampling, tight channel matching, and robust industrial operation.
FAQ
What is the maximum sampling rate supported by the AD7863ARS-3?
The AD7863ARS-3 supports a maximum sampling rate of 175 kSPS per channel in Mode 1 operation. This is achieved with a guaranteed 5.2 μs conversion time and requires proper timing coordination of CONVST and RD signals. The device maintains full 14-bit accuracy and specified dynamic performance (77 dB SNR) at this rate across its full operating temperature range.
Does the AD7863ARS-3 require an external reference voltage?
No, the AD7863ARS-3 includes an internal 2.5 V reference with ±10 mV accuracy at 25°C and 25 ppm/°C temperature coefficient. The VREF pin serves as both output and input - it can be used as-is or overdriven by a higher-precision external reference. Using the internal reference eliminates external component count while meeting most industrial signal chain requirements.
How does the AD7863ARS-3 handle simultaneous sampling of two channels?
The AD7863ARS-3 uses two independent track-and-hold amplifiers that respond identically to the falling edge of the CONVST signal, capturing VA1/VA2 or VB1/VB2 at precisely the same instant. Aperture delay matching is guaranteed ≤350 ps, ensuring phase coherence for FFT, vector control, and power calculations - a core differentiator versus multiplexed single-ADC architectures.
What are the power consumption characteristics of the AD7863ARS-3?
In normal operation, the AD7863ARS-3 draws 16 mA typical from a 5 V supply (70 mW). In power-down mode (Mode 2), quiescent current drops to 20 μA max (105 μW), activated automatically after conversion completion. This dual-mode operation makes AD7863ARS-3 suitable for battery-powered instrumentation where duty-cycled acquisition is employed.
Can the AD7863ARS-3 interface directly with common microcontrollers?
Yes, the AD7863ARS-3 features a standard 14-bit parallel TTL-compatible interface with CS and RD control lines. It has been validated for direct connection to ADSP-2100, MC68000, TMS320C25, and 80C196 processors without glue logic. Timing margins meet or exceed industry-standard microprocessor bus specifications, including setup/hold and access time requirements.
AD7863ARS-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-3 FAQ
1.How can I place an order for AD7863ARS-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7863ARS-3 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-3 reliable?
The price and inventory of AD7863ARS-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7863ARS-3 is usually 5 days.
3.What payment methods are accepted for AD7863ARS-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7863ARS-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7863ARS-3?
AD7863ARS-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7863ARS-3 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-3?
For technical support, including AD7863ARS-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7863ARS-3 requirements.
6.How does Aetrix verify that AD7863ARS-3 is sourced from the original manufacturer or authorized distributors?
All AD7863ARS-3 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-3 meets industry standards.
7.What is the process for return or replacement of AD7863ARS-3?
All AD7863ARS-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7863ARS-3, 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-3 part is unused and in its original packaging.
Return procedure for AD7863ARS-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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