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Analog Devices Inc. AD7862AR-3REEL
- Part No.:
- AD7862AR-3REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7862AR-3REEL.pdf
- Description:
- IC ADC 12BIT DUAL 250KSPS 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
AD7862AR-3REEL from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter (ADC) with four analog inputs grouped into two synchronized channels (A and B), ±2.5 V input range, 250 kSPS throughput, and integrated +2.5 V reference. It preserves phase coherence between channels for motor control and power monitoring applications.
For engineers reviewing the AD7862AR-3REEL datasheet, AD7862AR-3REEL pinout, AD7862AR-3REEL application, or AD7862AR-3REEL equivalent, this page delivers verified specifications, real-world use cases, validated alternatives, package mapping, and supply support - all grounded in Analog Devices' official documentation for the AD7862-3 variant in 28-lead SOIC (R-28) packaging.
Technical Context
The AD7862AR-3REEL integrates two independent 4 µs successive approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling of VA1/VA2 and VB1/VB2 within 200 ps aperture delay matching. Its internal laser-trimmed clock eliminates external timing components.
It operates from a single +5 V supply (±5%), delivers 70 dB SNR at 100 kHz input, –78 dB THD, and –80 dB channel-to-channel isolation. The parallel 12-bit interface uses standard CS/RD control with A0 multiplexer select to sequence reads across both channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes over full operating temperature range (–40°C to +85°C). |
| Sampling Rate | 250 kSPS - supports real-time acquisition of fast transients in UPS and motor control systems. |
| Analog Input Range | ±2.5 V - matches common signal processing levels without external scaling; enables direct connection to op-amp outputs. |
| Conversion Time | 3.6 µs - defines minimum inter-conversion interval; enables deterministic timing in closed-loop control. |
| SNR @ 100 kHz | 70 dB min - ensures ≥11.3 effective bits for high-fidelity waveform capture in communications and DAQ. |
| Aperture Delay Matching | 200 ps typ - preserves phase alignment between channels for accurate vector measurements in AC motor drives. |
| Power Dissipation | 60 mW typ - supports low-heat designs in dense industrial PCB layouts; standby mode draws only 75 µW. |
| Reference | +2.5 V internal (±10 mV @ 25°C, 25 ppm/°C) - eliminates need for external reference unless tighter accuracy is required. |
Pinout & Package
AD7862AR-3REEL is housed in a 28-lead Small Outline IC (SOIC) package (R-28), 300 mil width, RoHS-compliant, with exposed pad not present. Pin 1 is marked by notch or dot; pins 1–14 occupy top row, 15–28 bottom row, left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No connect - must remain unconnected; no internal bonding or function. |
| 2–9, 11–15 | DB11–DB0 | 12-bit parallel data bus (MSB first) - three-state TTL outputs; twos complement coding for AD7862-3. |
| 7 | DGND | Digital ground reference - separate from AGND to minimize digital noise coupling into analog path. |
| 8 | CONVST | Convert start input - falling edge triggers simultaneous hold and conversion on both channels. |
| 16, 27 | AGND | Analog ground - dedicated return for mux, track/hold, reference, and ADC circuitry; must be star-connected. |
| 17, 18, 25, 26 | VB2, VA2, VA1, VB1 | Four analog inputs - VA1/VA2 = Channel A; VB1/VB2 = Channel B; ±2.5 V range with ±7 V overvoltage tolerance. |
| 19 | VREF | Reference I/O - supplies or accepts +2.5 V reference; internal buffer has 2 kΩ output impedance. |
| 20 | A0 | Multiplexer select - controls read sequence: A0 low → VA1/VB1 first; A0 high → VA2/VB2 second. |
| 21 | CS | Chip select - active-low enable for parallel interface; must be asserted before RD to access data. |
| 22 | RD | Read strobe - active-low; latches DB11–DB0 on falling edge; determines which channel's result is output. |
| 23 | BUSY | Conversion status - high during conversion; falls at completion to signal data readiness. |
| 24 | VDD | +5 V supply - single rail powers analog and digital sections; ±5% tolerance required for spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling & conversion | Preserves phase relationship between VA1/VA2 and VB1/VB2 - essential for vector control in inverters and grid-tie converters. |
| Integrated +2.5 V reference | ±10 mV initial error and 25 ppm/°C drift - eliminates external reference cost and layout area while meeting ±1 LSB linearity. |
| Overvoltage protection | ±7 V tolerance on analog inputs - withstands transient surges in industrial environments without clamping diodes. |
| Auto power-down mode | Reduces current to 25 µA standby - extends battery life in portable DAQ and reduces thermal load in fanless enclosures. |
| High-speed parallel interface | 35 ns CONVST pulse width and 60 ns data access time - interfaces directly with 8051, ARM Cortex-M, and DSP buses without glue logic. |
| Tight aperture delay matching | 200 ps max mismatch between channels - enables sub-degree phase measurement accuracy in synchrophasor applications. |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
|
Use Scenario: Real-time sensing of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling captures current and voltage waveforms with preserved phase alignment for field-oriented control (FOC) algorithms. Use Value: Enables precise torque ripple reduction and efficient regenerative braking by eliminating inter-channel sampling skew. |
Use Scenario: Monitoring input AC line voltage, output AC waveform, and battery voltage during transfer switching. IC Role / Device Role / Timing Role: Synchronized acquisition of line and load signals allows instantaneous detection of zero-crossing anomalies and harmonic distortion buildup. Use Value: Supports fast switchover (<10 ms) and predictive maintenance via waveform quality analysis without external synchronization. |
| Data Acquisition Systems | Communications Baseband Processing |
|
Use Scenario: Multi-channel vibration and temperature monitoring in industrial predictive maintenance nodes. IC Role / Device Role / Timing Role: Simultaneous sampling of accelerometer and thermistor outputs enables coherent time-domain correlation analysis. Use Value: Delivers phase-coherent 12-bit data at 250 kSPS per channel - sufficient for 40 kHz Nyquist bandwidth with margin. |
Use Scenario: Digitizing I/Q baseband signals in software-defined radio (SDR) front-ends and broadband modems. IC Role / Device Role / Timing Role: Dual ADC channels acquire in-phase and quadrature components with matched gain and timing for accurate constellation reconstruction. Use Value: Achieves 70 dB SNR and –78 dB THD - meets EVM requirements for QPSK and 16-QAM up to 100 kHz bandwidth. |
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 |
|---|---|---|---|
| AD7863AR-3REEL | 14-bit resolution, same pinout and timing; higher SNR (74 dB), slower conversion (4.5 µs), higher power (85 mW). | Required when >12-bit dynamic range is needed for high-precision metrology or audio test equipment. | Select AD7863AR-3REEL only if 14-bit resolution justifies increased cost and power; otherwise AD7862AR-3REEL provides optimal balance. |
| ADS8364IPAG | 6-channel, 16-bit, SPI interface; no internal reference; requires external REF; 250 kSPS aggregate (not per channel). | Suitable for multi-sensor systems needing >4 inputs but not strict channel-to-channel simultaneity. | Choose ADS8364IPAG for scalable channel count and SPI simplicity; avoid when true dual-channel simultaneity or parallel bus integration is mandatory. |
Compared with AD7863AR-3REEL and ADS8364IPAG, AD7862AR-3REEL uniquely delivers guaranteed 12-bit simultaneous sampling across exactly two channels with integrated reference and parallel interface - making it the most direct solution for cost-sensitive, space-constrained motor control and UPS designs requiring deterministic timing and minimal BOM count.
Availability
AD7862AR-3REEL is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and industrial data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7862AR-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7862 belongs to Analog Devices' precision data acquisition product line, designed specifically for industrial automation, energy infrastructure, and real-time control systems demanding synchronized multi-channel sampling with minimal latency and high dc/dc+ac accuracy.
FAQ
What is the analog input voltage range supported by the AD7862AR-3REEL?
The AD7862AR-3REEL supports a bipolar ±2.5 V analog input range with ±7 V overvoltage tolerance. This range is fixed for the -3 variant and does not require external scaling resistors. Input resistance is 6 kΩ minimum, and input current is limited to ±500 nA, ensuring compatibility with standard op-amp drivers without loading effects. The AD7862AR-3REEL uses twos complement output coding.
How does the AD7862AR-3REEL achieve simultaneous sampling across two channels?
The AD7862AR-3REEL achieves true simultaneous sampling using two independent track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same time, with aperture delay matching of 200 ps typical. This preserves phase coherence between VA1/VA2 and VB1/VB2, enabling accurate vector calculations in motor control and power quality analysis - a capability confirmed in the AD7862 functional block diagram and timing specifications.
Can the AD7862AR-3REEL operate with an external reference, and what are the requirements?
Yes, the AD7862AR-3REEL can use an external +2.5 V reference applied to the VREF pin. The internal reference is overdriven when an external source is connected. The reference input accepts ±100 µA max current and must be stable within ±0.5% to maintain ±1 LSB linearity. Recommended sources include AD780 or REF43; a 0.1 µF ceramic capacitor to AGND is still required for decoupling regardless of reference source.
What is the power consumption profile of the AD7862AR-3REEL in normal and standby modes?
In normal operation, the AD7862AR-3REEL consumes 15 mA typical from its +5 V supply, equating to 60 mW typical power dissipation. In standby (auto power-down) mode - activated automatically after conversion completes - supply current drops to 25 µA, reducing power to 75 µW. This mode eliminates manual sleep/wake sequencing and is ideal for battery-powered DAQ nodes where duty cycling is used.
Is the AD7862AR-3REEL pin-compatible with other variants in the AD7862 family?
Yes, all AD7862 variants - including AD7862AR-10, AD7862AR-3, and AD7862AR-2 - share identical 28-lead SOIC (R-28) pinouts and parallel interface timing. Only the analog input range and output coding differ: AD7862AR-3 uses ±2.5 V range and twos complement, while AD7862AR-2 uses 0–2.5 V and straight binary. No PCB changes are required when substituting within the same package option.
AD7862AR-3REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 2
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7862AR-3REEL FAQ
1.How can I place an order for AD7862AR-3REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862AR-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 AD7862AR-3REEL reliable?
The price and inventory of AD7862AR-3REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862AR-3REEL is usually 5 days.
3.What payment methods are accepted for AD7862AR-3REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862AR-3REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862AR-3REEL?
AD7862AR-3REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862AR-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 AD7862AR-3REEL?
For technical support, including AD7862AR-3REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862AR-3REEL requirements.
6.How does Aetrix verify that AD7862AR-3REEL is sourced from the original manufacturer or authorized distributors?
All AD7862AR-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 AD7862AR-3REEL meets industry standards.
7.What is the process for return or replacement of AD7862AR-3REEL?
All AD7862AR-3REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7862AR-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 AD7862AR-3REEL part is unused and in its original packaging.
Return procedure for AD7862AR-3REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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