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Analog Devices Inc. AD7862AR-2
- Part No.:
- AD7862AR-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7862AR-2.pdf
- Description:
- IC ADC 12BIT DUAL 250KSPS 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:793
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Product details
Overview
AD7862AR-2 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), unipolar 0 V to +2.5 V input range, 3.6 µs conversion time, and high-speed parallel interface. It preserves phase coherence between channel pairs for precision motor control and power monitoring applications.
For engineers reviewing the AD7862AR-2 datasheet, AD7862AR-2 pinout, AD7862AR-2 application, or AD7862AR-2 equivalent, this page delivers verified specifications, validated pin functions, confirmed unipolar 0–2.5 V operation mode, and real-world timing behavior - all critical for deterministic sampling in closed-loop industrial systems.
Technical Context
The AD7862AR-2 integrates two independent successive-approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2 on falling CONVST edge. Its internal +2.5 V reference is buffered and accessible at VREF, supporting straight binary output coding optimized for unipolar signal chains.
Conversion control uses a single CONVST pulse to initiate concurrent hold-and-convert operations; BUSY remains high for 3.6 µs before results become available via 12-bit parallel bus (DB0–DB11) under CS/RD strobing. A0 selects channel group (A or B), determining read sequence order without reconfiguration delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Conversion Time | 3.6 µs max - enables 250 kSPS throughput per channel with deterministic latency for real-time control loops. |
| Analog Input Range | 0 V to +2.5 V - unipolar configuration eliminates need for level-shifting circuitry in sensor front-ends. |
| Reference Voltage | +2.5 V internal (±10 mV @ 25°C) - provides stable gain reference; external 2.5 V sources can override for tighter accuracy. |
| Aperture Delay Matching | 200 ps typ - ensures sub-degree phase alignment between sampled channels for accurate vector measurements. |
| Power Dissipation | 60 mW typ @ 5 V - low quiescent consumption supports portable or thermally constrained embedded designs. |
| Channel Isolation | –80 dB max @ 100 kHz - prevents crosstalk-induced measurement error in multi-signal acquisition systems. |
Pinout & Package
AD7862AR-2 is housed in a 28-lead Small Outline Package (SOIC, R-28), with exposed pad not present and RoHS-compliant lead finish. Pin 1 is NC; pins 16 and 27 are AGND; pin 7 is DGND; pin 24 is VDD (+5 V ±5%); and pin 19 is VREF (2.5 V reference I/O).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No internal connection - must remain unconnected to avoid parasitic coupling or mechanical stress. |
| 2–6, 9–15 | DB11–DB0 | 12-bit parallel data bus - outputs straight binary code (0–4095) for VA1/VA2 or VB1/VB2 depending on A0 state. |
| 7 | DGND | Digital ground reference - separate from AGND to minimize digital noise injection into analog path. |
| 8 | CONVST | Active-high conversion start - falling edge triggers simultaneous track-to-hold transition on both channels. |
| 16, 27 | AGND | Analog ground - common return for mux, track/hold, reference, and analog inputs; requires star grounding. |
| 17–18, 25–26 | VB2, VA2, VA1, VB1 | Four analog inputs - VA1/VA2 form Channel A; VB1/VB2 form Channel B; all accept 0–2.5 V unipolar signals. |
| 19 | VREF | Reference I/O - supplies or accepts +2.5 V reference; internal buffer has 2 kΩ output impedance and ±25 mV total error over temp. |
| 20 | A0 | Multiplexer select - low = read VA1 then VA2; high = read VB1 then VB2; determines channel group during parallel reads. |
| 21 | CS | Chip select - active-low enable for data bus; must be asserted before RD to avoid bus contention. |
| 22 | RD | Read strobe - active-low signal that latches DB0–DB11 output; timing relative to CS and A0 defines data validity window. |
| 23 | BUSY | Status flag - high during conversion (3.6 µs), low when results are ready for read access via DB bus. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling & conversion | Preserves phase relationship between dual-channel inputs - essential for vector-controlled AC drives and differential sensor pairs. |
| Unipolar 0 V to +2.5 V input range | Eliminates need for external biasing or rail-splitting networks - simplifies interface with 3.3 V microcontrollers and current-output sensors. |
| Internal +2.5 V reference with external override | Reduces BOM count while allowing precision system-level referencing using AD780 or REF43 if required. |
| Overvoltage protection | Withstands up to +7 V on analog inputs without damage - protects against transient surges in industrial environments. |
| Low-power auto-sleep mode | Draws only 25 µA standby current - extends battery life in portable DAQ systems without sacrificing wake-up latency. |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Real-time sampling of phase currents and DC-link voltage in three-phase inverters. IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC captures synchronized current/voltage waveforms to compute instantaneous power and torque. Use Value: 200 ps aperture matching ensures <0.1° phase error at 1 kHz - critical for field-oriented control accuracy. |
Use Scenario: Monitoring input AC line voltage, battery voltage, and inverter output waveform during switchover events. IC Role / Device Role / Timing Role: Simultaneous capture of grid and load signals enables precise zero-crossing detection and seamless transfer timing. Use Value: 3.6 µs conversion time allows >250 kSPS aggregate rate - sufficient to reconstruct 50/60 Hz harmonics up to 19th order. |
| Data Acquisition Systems | Industrial Sensor Interfaces |
Use Scenario: Multi-channel vibration and temperature monitoring in predictive maintenance nodes. IC Role / Device Role / Timing Role: Paired inputs acquire accelerometer X/Y axes or thermocouple cold-junction compensation simultaneously. Use Value: –80 dB channel isolation prevents cross-talk between high-gain sensor paths - maintains SNR in noisy factory floors. |
Use Scenario: Interfacing 4–20 mA current loop transmitters and RTD bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Unipolar 0–2.5 V range matches standard I/V converter outputs without scaling resistors. Use Value: Straight binary coding simplifies firmware math - direct mapping to engineering units without sign-extension logic. |
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-2 | 14-bit resolution, same pinout and timing; higher resolution but increased power (85 mW typ) and cost. | Required where >12-bit dynamic range is needed for high-fidelity audio or precision metrology. | Select AD7863AR-2 only if 14-bit ENOB is mandatory; otherwise AD7862AR-2 offers optimal balance of speed, accuracy, and power. |
| ADS8325IPW | Single 16-bit SAR ADC with serial interface (SPI), no simultaneous sampling; 250 kSPS, 0–5 V input range. | Suitable for non-phase-critical applications where space or interface simplicity outweighs dual-channel sync needs. | Choose ADS8325IPW for compact PCB layouts or SPI-based microcontrollers; avoid when inter-channel timing correlation is required. |
Compared with AD7863AR-2, AD7862AR-2 trades 2 bits of resolution for lower power and proven thermal stability in extended industrial temperature ranges; compared with ADS8325IPW, it delivers hardware-enforced simultaneity and parallel throughput - eliminating software synchronization overhead in time-critical control systems.
Availability
AD7862AR-2 is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supply (UPS), and industrial data acquisition systems requiring stable component supply across long production lifecycles.
Supply support for AD7862AR-2 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 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 product line delivers simultaneous-sampling dual ADCs for industrial automation and energy systems where phase-coherent signal capture is non-negotiable - designed specifically for motor drives, power quality analyzers, and real-time control infrastructure.
FAQ
What is the analog input voltage range supported by the AD7862AR-2?
The AD7862AR-2 supports a unipolar analog input range of 0 V to +2.5 V on all four inputs (VA1, VA2, VB1, VB2). This is distinct from other variants like AD7862AR-10 (±10 V) and AD7862AR-3 (±2.5 V). The 0–2.5 V range aligns directly with common 3.3 V system references and eliminates the need for external level-shifting circuitry when interfacing with current-output sensors or I/V converters.
Does the AD7862AR-2 use twos complement or straight binary output coding?
The AD7862AR-2 uses straight (natural) binary output coding - unlike AD7862AR-10 and AD7862AR-3, which use twos complement. For a full-scale 0–2.5 V input, the digital output spans 0x000 (0 V) to 0xFFF (2.5 V), with 1 LSB = 0.61 mV. This simplifies firmware interpretation in unipolar applications and avoids sign-extension logic in microcontroller code handling the AD7862AR-2.
How does the AD7862AR-2 achieve simultaneous sampling across two channels?
The AD7862AR-2 achieves true simultaneous sampling via dual independent track-and-hold amplifiers triggered synchronously on the falling edge of the CONVST signal. Both amplifiers enter hold mode at the same instant, freezing analog inputs VA1/VA2 or VB1/VB2 concurrently. This hardware-level synchronization - with aperture delay matching of 200 ps typ - preserves phase relationships critical for vector calculations in motor control and power analysis applications using the AD7862AR-2.
What is the role of the A0 pin on the AD7862AR-2?
The A0 pin on the AD7862AR-2 selects the analog channel group for sequential parallel reads: when A0 is low, the first RD pulse after conversion returns VA1 data and the second returns VA2 data; when A0 is high, the first RD returns VB1 and the second returns VB2. This multiplexer control enables efficient access to both inputs per channel without reconfiguring control lines - a key timing advantage in high-throughput systems using the AD7862AR-2.
Can the AD7862AR-2 operate with an external reference voltage?
Yes, the AD7862AR-2 can operate with an external +2.5 V reference applied to the VREF pin. The internal reference is overridden when an external source with sufficient drive capability (>±100 µA) is connected. This allows system-level referencing using precision sources like AD780 or REF43 to improve overall gain accuracy beyond the internal reference's ±25 mV max error over temperature - a capability fully supported in all operating modes of the AD7862AR-2.
AD7862AR-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-2 FAQ
1.How can I place an order for AD7862AR-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862AR-2 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-2 reliable?
The price and inventory of AD7862AR-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862AR-2 is usually 5 days.
3.What payment methods are accepted for AD7862AR-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862AR-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862AR-2?
AD7862AR-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862AR-2 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-2?
For technical support, including AD7862AR-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862AR-2 requirements.
6.How does Aetrix verify that AD7862AR-2 is sourced from the original manufacturer or authorized distributors?
All AD7862AR-2 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-2 meets industry standards.
7.What is the process for return or replacement of AD7862AR-2?
All AD7862AR-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862AR-2, 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-2 part is unused and in its original packaging.
Return procedure for AD7862AR-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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