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Analog Devices Inc. AD7862AN-3
- Part No.:
- AD7862AN-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD7862AN-3.pdf
- Description:
- IC ADC 12BIT DUAL 250KSPS 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,613
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Product details
Overview
AD7862AN-3 from Analog Devices is a dual-channel, simultaneous-sampling 12-bit analog-to-digital converter (ADC) with ±2.5 V input range, 3.6 µs conversion time, and integrated +2.5 V reference - designed for phase-critical acquisition in motor control and power monitoring systems.
For engineers reviewing the AD7862AN-3 datasheet, AD7862AN-3 pinout, AD7862AN-3 application, or AD7862AN-3 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in Analog Devices' official AD7862 Rev. 0 documentation and ordering guide.
Technical Context
The AD7862AN-3 integrates two independent successive-approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling across four analog inputs (VA1/VA2/VB1/VB2) grouped into two channels. Its internal laser-trimmed clock eliminates external timing components.
It uses a single +5 V supply, features twos-complement output coding, and supports high-speed parallel readout via 12-bit TTL-compatible data bus (DB0–DB11), with CONVST-triggered synchronous capture and BUSY-driven status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes and supports 4096 distinct digital output levels. |
| Conversion Time | 3.6 µs max - enables 250 kSPS throughput per channel with deterministic latency. |
| Analog Input Range | ±2.5 V - optimized for signal processing applications requiring bipolar dynamic range without external scaling. |
| Relative Accuracy | ±1 LSB max - ensures end-point linearity within 0.024% of full scale for precision measurement. |
| Signal-to-(Noise+Distortion) | 70 dB min at 100 kHz - supports clean digitization of medium-frequency AC waveforms. |
| Aperture Delay Matching | 200 ps typ - preserves sub-degree phase coherence between Channel A and Channel B inputs. |
| Power Dissipation | 60 mW typ (normal mode) - suitable for thermally constrained industrial embedded designs. |
Pinout & Package
AD7862AN-3 is housed in a 28-pin plastic DIP (N-28) package with 0.6-inch width and through-hole mounting. Pin 1 is top-left corner (notch side), and pins 1 & 28 are NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No internal connection; must remain unconnected per datasheet. |
| 2–9, 11–15, 19, 21–22, 24–26 | DB11–DB0, CONVST, CS, RD, VDD, VA1–VB2, VREF, A0, BUSY | Primary functional interface: 12-bit parallel data bus, control signals, analog inputs, reference I/O, and status output. |
| 7, 16, 27 | DGND, AGND (×2) | Separate digital and analog ground returns - mandatory for noise isolation in mixed-signal layout. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Both track-and-hold amplifiers latch on same CONVST falling edge - preserves inter-channel phase integrity for vector measurements. |
| Integrated Reference | +2.5 V internal reference with ±10 mV error at 25°C - eliminates need for external reference in cost-sensitive designs. |
| Overvoltage Protection | ±7 V absolute max on analog inputs - withstands transient surges without damage in industrial sensor interfaces. |
| Low-Power Auto-Sleep | 75 µW standby power - extends battery life in portable DAQ systems while retaining fast wake-up (<1 µs). |
| Channel Isolation | –80 dB min crosstalk - prevents signal leakage between Channel A and Channel B during concurrent acquisition. |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Real-time acquisition of phase current and DC bus voltage for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling ADC capturing synchronized current/voltage waveforms to compute torque and flux vectors. Use Value: 200 ps aperture delay matching ensures <0.1° phase error at 1 kHz - critical for accurate rotor position estimation. |
Use Scenario: Monitoring input AC waveform, battery voltage, and inverter output during grid failure and switchover events. IC Role / Device Role / Timing Role: Simultaneous digitization of line voltage and load current to detect zero-crossing and harmonic distortion before transfer. Use Value: 3.6 µs conversion time enables >250 kSPS sampling - sufficient to resolve THD up to 50th harmonic (5 kHz) at 100 kHz Nyquist. |
| Data Acquisition Systems | Communications Baseband |
Use Scenario: Multi-sensor monitoring in industrial PLCs where vibration, temperature, and pressure signals require time-aligned capture. IC Role / Device Role / Timing Role: Dual 12-bit ADC providing synchronized samples from two sensor groups (e.g., accelerometers + strain gauges) on shared CONVST. Use Value: ±1 LSB relative accuracy over –40°C to +85°C ensures calibrated measurement repeatability without per-unit trimming. |
Use Scenario: Digitizing I/Q baseband signals from RF front-end mixers in software-defined radio receivers. IC Role / Device Role / Timing Role: Simultaneous sampling of in-phase (I) and quadrature (Q) analog paths to preserve complex signal integrity. Use Value: 70 dB SNR at 100 kHz supports 11-bit effective resolution - adequate for 16-QAM demodulation with <1% EVM. |
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-3 | 14-bit resolution, same pinout, identical timing and interface - requires no PCB change but increases data path width. | Higher resolution needed for dynamic range >80 dB (e.g., audio test equipment); not required for motor control SNR targets. | Select AD7863AR-3 only when 14-bit precision is mandated and system firmware/hardware can handle extended word length. |
| ADS8364IPAG | 6-channel simultaneous sampling, SPI interface, 2.7 V–5.5 V supply - different serial protocol and channel count. | Suitable for space-constrained multi-sensor systems where parallel bus is undesirable and higher channel density is needed. | Choose ADS8364IPAG when expanding beyond 2 channels or migrating to SPI-based microcontroller platforms. |
Compared with AD7862AN-3, AD7863AR-3 offers higher resolution in identical form factor, while ADS8364IPAG trades parallel simplicity for channel scalability and serial flexibility - neither is pin-compatible, but both address adjacent design requirements in industrial DAQ.
Availability
AD7862AN-3 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 obsolescence management, and traceable sourcing.
Supply support for AD7862AN-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 is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7862 product line was engineered for simultaneous dual-channel data acquisition in real-time industrial systems - emphasizing phase coherence, low-latency conversion, and robust operation under electrical stress.
FAQ
What is the analog input voltage range supported by the AD7862AN-3?
The AD7862AN-3 supports a bipolar ±2.5 V analog input range across all four inputs (VA1, VA2, VB1, VB2). This is fixed per device variant and cannot be reconfigured. Overvoltage protection allows inputs to safely reach ±7 V without damage, making it suitable for noisy industrial environments where transients may occur.
Does the AD7862AN-3 require an external reference voltage?
No, the AD7862AN-3 includes an internal +2.5 V reference with ±10 mV accuracy at +25°C and 25 ppm/°C temperature coefficient. To use it, simply connect a 0.1 µF ceramic capacitor from VREF to AGND. An external reference can be applied to VREF if tighter tolerance or system-level reference synchronization is required.
How does the AD7862AN-3 achieve simultaneous sampling across two channels?
The AD7862AN-3 achieves true simultaneous sampling using two matched track-and-hold amplifiers that both enter hold mode on the same falling edge of the CONVST signal. Aperture delay matching is specified at 200 ps typical, ensuring phase alignment between Channel A and Channel B inputs - essential for vector-based measurements.
What is the function of the A0 pin on the AD7862AN-3?
The A0 pin on the AD7862AN-3 selects which pair of conversion results is accessed during parallel readout: when A0 is low, the first RD pulse after conversion reads VA1 or VB1; when A0 is high, the next RD pulse reads VA2 or VB2. This multiplexer control enables sequential access to all four input channels using a single 12-bit data bus.
Is the AD7862AN-3 compatible with 3.3 V logic interfaces?
No, the AD7862AN-3 is a 5 V-only device: its digital inputs require VINH ≥ 2.4 V and VINL ≤ 0.8 V with VDD = 5 V ±5%, and outputs drive VOH ≥ 4.0 V (ISOURCE = 200 µA). Direct interfacing with 3.3 V microcontrollers requires level-shifting circuitry on CS, RD, CONVST, A0, and DBx lines.
AD7862AN-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7862AN-3 FAQ
1.How can I place an order for AD7862AN-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862AN-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 AD7862AN-3 reliable?
The price and inventory of AD7862AN-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862AN-3 is usually 5 days.
3.What payment methods are accepted for AD7862AN-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862AN-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862AN-3?
AD7862AN-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862AN-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 AD7862AN-3?
For technical support, including AD7862AN-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862AN-3 requirements.
6.How does Aetrix verify that AD7862AN-3 is sourced from the original manufacturer or authorized distributors?
All AD7862AN-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 AD7862AN-3 meets industry standards.
7.What is the process for return or replacement of AD7862AN-3?
All AD7862AN-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862AN-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 AD7862AN-3 part is unused and in its original packaging.
Return procedure for AD7862AN-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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