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Analog Devices Inc. AD7862ARSZ-3
- Part No.:
- AD7862ARSZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7862ARSZ-3.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,057
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Product details
Overview
AD7862ARSZ-3 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, 3.6 µs conversion time, and integrated +2.5 V reference. It preserves phase coherence between channel pairs and is used in AC motor control for real-time current/voltage vector sampling.
For engineers reviewing the AD7862ARSZ-3 datasheet, AD7862ARSZ-3 pinout, AD7862ARSZ-3 application, or AD7862ARSZ-3 equivalent, this page delivers verified specifications, validated pin functions, confirmed timing behavior, and real-world use context - all specific to the AD7862ARSZ-3 variant with RS-28 shrink SOIC package and ±2.5 V bipolar input range.
Technical Context
The AD7862ARSZ-3 implements two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2 on falling edge of CONVST. Its internal laser-trimmed clock eliminates external timing components, and aperture delay matching is ≤200 ps.
It uses a single +5 V supply, features twos-complement output coding, and integrates signal scaling circuitry optimized for ±2.5 V full-scale range - delivering 70 dB SNR at 100 kHz input, ±1 LSB relative accuracy, and ±7 V overvoltage protection on analog inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes across full operating temperature range. |
| Conversion Time | 3.6 µs max - enables 250 kSPS throughput per channel with deterministic latency. |
| Analog Input Range | ±2.5 V - supports standard signal processing levels without external scaling. |
| SNR @ 100 kHz | 70 dB min - ensures clean digitization of high-frequency motor control waveforms. |
| Relative Accuracy | ±1 LSB max - maintains linearity for precise amplitude measurement in closed-loop systems. |
| Aperture Delay Matching | ≤200 ps - preserves phase integrity between sampled channels for vector calculations. |
| Power Dissipation | 60 mW typ at +5 V - suitable for thermally constrained industrial modules. |
Pinout & Package
AD7862ARSZ-3 is housed in a 28-lead Shrink Small Outline Package (SSOP, RS-28), 5.6 mm × 10.2 mm body, 0.65 mm lead pitch, exposed pad optional. Pin 1 marked via notch or dot; pins 1 and 28 are NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (Pin 8) | Conversion Start Input | Falling-edge-triggered global sample command - initiates simultaneous hold on both track/holds and starts dual conversions. |
| BUSY (Pin 23) | Conversion Status Output | Active-high open-drain signal indicating conversion in progress; goes low when results are latched and ready for read. |
| A0 (Pin 20) | Multiplexer Channel Select | Controls data read sequence: A0 low reads VA1/VB1 first; A0 high reads VA2/VB2 first - enables flexible channel pairing. |
| VREF (Pin 19) | Reference I/O | Provides access to internal +2.5 V reference (±10 mV @ 25°C); can be overdriven by external precision reference for improved gain stability. |
| VA1/VA2/VB1/VB2 (Pins 25,18,26,17) | Analog Input Terminals | Four differential-pair-capable inputs with ±7 V fault tolerance - configured as two synchronized 2-input channels (A and B). |
| DB0–DB11 (Pins 2–6,9–15) | Parallel Data Bus | 12-bit three-state TTL outputs with twos-complement coding - supports direct interface to 8051, DSP, or FPGA without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two matched track/hold amplifiers acquire VA1/VA2 or VB1/VB2 within ≤200 ps timing skew - essential for accurate dq-axis decomposition. |
| Integrated Reference | +2.5 V buffered reference with 25 ppm/°C drift and ±25 mV total error over –40°C to +85°C - eliminates need for external reference in cost-sensitive designs. |
| Overvoltage Protection | Analog inputs withstand ±7 V continuously without damage - protects against transients in motor drive feedback paths. |
| Low-Power Auto-Sleep | Reduces IDD to 25 µA in standby; wakes before next CONVST - extends battery life in portable test equipment. |
| High-Speed Parallel Interface | Supports 250 kSPS sustained read rate with t5 = 60 ns data access time - avoids FIFO bottlenecks in real-time control loops. |
Applications
| AC Motor Current Sensing | Uninterruptible Power Supply (UPS) Monitoring |
|---|---|
Use Scenario: Real-time sampling of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC captures IA/IB or VDC/IDC pairs with sub-200 ps inter-channel skew to preserve vector angle fidelity. Use Value: Enables accurate field-oriented control (FOC) without interpolation artifacts; ±1 LSB linearity ensures torque ripple < 0.5%. |
Use Scenario: Concurrent monitoring of input AC line voltage, battery voltage, and load current during switchover events. IC Role / Device Role / Timing Role: Synchronized sampling of multiple safety-critical parameters ensures coherent state estimation during transient transitions. Use Value: Eliminates timing-induced measurement ambiguity during millisecond-scale transfer events; ±7 V input tolerance handles brownout surges. |
| Data Acquisition Front-End | Industrial Communications Interface |
Use Scenario: High-fidelity acquisition of vibration, temperature, and pressure signals in predictive maintenance nodes. IC Role / Device Role / Timing Role: Simultaneous dual-channel capture supports cross-correlation analysis of mechanical resonance modes. Use Value: 70 dB SNR at 100 kHz enables detection of sub-millivolt bearing fault signatures buried in noise floor. |
Use Scenario: Digitizing analog sensor outputs (e.g., 4–20 mA loop signals) for protocol translation to EtherCAT or PROFINET. IC Role / Device Role / Timing Role: Provides deterministic 3.6 µs conversion latency required for hard real-time industrial Ethernet cycle times. Use Value: Parallel interface reduces host CPU overhead vs. SPI alternatives; 60 mW power enables integration into space-constrained gateway modules. |
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 |
|---|---|---|---|
| AD7863ARSZ-3 | 14-bit resolution, same pinout and timing; higher SNR (74 dB), larger code width (0.305 mV), identical ±2.5 V range and RS-28 package. | Required where 0.1% amplitude resolution is critical (e.g., precision energy metering), not needed for motor control FOC. | Select AD7863ARSZ-3 only if 14-bit dynamic range is mandatory; otherwise AD7862ARSZ-3 offers optimal cost/performance balance. |
| ADS8364IPAG | 6-channel simultaneous-sampling, 16-bit, SPI interface, 2.5 V supply; no internal reference; requires external REF and level-shifting for 5 V logic. | Suitable for multi-sensor systems needing >2 channels; incompatible pinout and interface - demands PCB redesign and firmware changes. | Choose ADS8364IPAG only when expanding beyond 2 synchronized channels; AD7862ARSZ-3 remains superior for minimal-footprint dual-channel needs. |
Compared with AD7863ARSZ-3, AD7862ARSZ-3 trades 2 bits of resolution for lower cost and proven thermal stability in motor drive environments; versus ADS8364IPAG, it provides drop-in compatibility with legacy 5 V microcontrollers and eliminates external reference design complexity.
Availability
AD7862ARSZ-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 lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7862ARSZ-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7862 product line was designed specifically for real-time industrial control applications demanding synchronized multi-channel acquisition, including servo drives, power inverters, and automated test equipment.
FAQ
What is the absolute maximum analog input voltage for AD7862ARSZ-3?
The AD7862ARSZ-3 supports ±7 V on analog inputs (VA1, VA2, VB1, VB2) without damage, per its Absolute Maximum Ratings table. This overvoltage tolerance applies specifically to the -3 version and exceeds its ±2.5 V operating range - protecting against transients in motor current sensing and UPS monitoring circuits. Operation beyond ±2.5 V will saturate the ADC but won't degrade performance upon return to range.
Does AD7862ARSZ-3 require an external reference?
No, AD7862ARSZ-3 includes an internal +2.5 V reference with ±10 mV accuracy at +25°C and ±25 mV over –40°C to +85°C. A 0.1 µF ceramic capacitor from VREF to AGND is sufficient for most applications. An external reference (e.g., AD780) may be connected to VREF only if tighter initial accuracy or lower drift is required - the internal reference remains disabled when external voltage is applied.
How does the A0 pin control data sequencing in AD7862ARSZ-3?
In AD7862ARSZ-3, the A0 pin selects which pair of conversion results appears first on the parallel bus: when A0 is low during CS/RD assertion, the first read returns VA1 or VB1 (depending on channel selection), and the second read returns VA2 or VB2; when A0 is high, the order reverses. This allows flexible mapping of physical sensors to digital data words without changing hardware connections.
What is the minimum acquisition time between conversions for AD7862ARSZ-3?
The AD7862ARSZ-3 requires no minimum dead time between conversions in high-sampling mode - it supports continuous 250 kSPS operation. However, the track/hold acquisition time is 0.3 µs, meaning the analog input must settle to within ±1/2 LSB before the next CONVST edge. For step changes >1 LSB, allow ≥0.3 µs after BUSY goes low before issuing the next CONVST pulse.
Is AD7862ARSZ-3 pin-compatible with other AD7862 variants?
Yes, AD7862ARSZ-3 shares identical pinout, package (RS-28), and interface timing with all AD7862-x variants (e.g., AD7862ARSZ-10, AD7862ARSZ-2). Only the analog input scaling resistors and output coding differ internally - no PCB layout change is needed when substituting between -2, -3, and -10 versions in the same RS-28 package.
AD7862ARSZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- 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:
- -
AD7862ARSZ-3 FAQ
1.How can I place an order for AD7862ARSZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862ARSZ-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 AD7862ARSZ-3 reliable?
The price and inventory of AD7862ARSZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862ARSZ-3 is usually 5 days.
3.What payment methods are accepted for AD7862ARSZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862ARSZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862ARSZ-3?
AD7862ARSZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862ARSZ-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 AD7862ARSZ-3?
For technical support, including AD7862ARSZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862ARSZ-3 requirements.
6.How does Aetrix verify that AD7862ARSZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7862ARSZ-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 AD7862ARSZ-3 meets industry standards.
7.What is the process for return or replacement of AD7862ARSZ-3?
All AD7862ARSZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862ARSZ-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 AD7862ARSZ-3 part is unused and in its original packaging.
Return procedure for AD7862ARSZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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