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Analog Devices Inc. AD7862ARSZ-2REEL
- Part No.:
- AD7862ARSZ-2REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7862ARSZ-2REEL.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,268
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Product details
Overview
AD7862ARSZ-2REEL 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), 3.6 µs conversion time, ±1 LSB relative accuracy, 0 V to +2.5 V unipolar input range, and high-speed parallel interface operating from a single +5 V supply. It is used in real-time motor control feedback loops where phase coherence between voltage and current sensing is critical.
For engineers reviewing the AD7862ARSZ-2REEL datasheet, AD7862ARSZ-2REEL pinout, AD7862ARSZ-2REEL application, or AD7862ARSZ-2REEL equivalent, this page delivers verified technical context, exact pin functions, confirmed dynamic performance (70 dB SNR, –78 dB THD), true alternative part comparisons, and supply-chain support for industrial embedded designs requiring synchronized dual-channel acquisition.
Technical Context
The AD7862ARSZ-2REEL implements two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling simultaneous sampling of VA1/VA2 or VB1/VB2 on falling edge of CONVST. Its internal +2.5 V reference (±10 mV at +25°C, 25 ppm/°C TC) directly supports the 0 V–2.5 V input range without external scaling.
Conversion is initiated by a single CONVST pulse; BUSY goes high during conversion and falls upon completion. Data is read via 12-bit parallel bus (DB0–DB11) using CS and RD controls, with A0 selecting channel pair (A or B), and output coding in straight binary format-distinct from twos complement used in AD7862-10/-3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes and full-scale quantization step of 0.61 mV (2.5 V / 4096) |
| Conversion Time | 3.6 µs max - enables 250 kSPS throughput per channel with deterministic timing |
| Input Range | 0 V to +2.5 V - unipolar operation eliminates need for level-shifting circuitry in sensor interfaces |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and ≤0.024% full-scale linearity error across temperature |
| SNR | 70 dB min at 100 kHz - supports clean digitization of medium-bandwidth signals like motor phase currents |
| THD | –78 dB max - preserves signal fidelity in closed-loop control applications sensitive to harmonic distortion |
| Supply Voltage | +5 V ±5% - single-rail compatibility simplifies power design versus dual-supply ADCs |
| Power Dissipation | 60 mW typ - low active power enables use in thermally constrained industrial modules |
Pinout & Package
AD7862ARSZ-2REEL is housed in a 28-lead Shrink Small Outline Package (SSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal enhancement. Pin 1 is marked with a dot; pins 1 and 28 are No Connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No internal connection - must remain unconnected per datasheet |
| 2–6, 9–15 | DB11–DB0 | 12-bit straight-binary data outputs - three-state TTL-compatible, driven only when CS and RD are low |
| 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 - common reference for mux, track/hold, reference, and ADC core; must be star-connected |
| 17, 18, 25, 26 | VB2, VA2, VA1, VB1 | Analog inputs - VA1/VA2 form Channel A; VB1/VB2 form Channel B; all accept 0–2.5 V range |
| 19 | VREF | Reference I/O - provides or accepts +2.5 V reference; internal buffer has 2 kΩ output impedance |
| 20 | A0 | Multiplexer select - selects channel pair (low = A, high = B) for sequential read access to VA1/VA2 or VB1/VB2 |
| 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-critical for valid data capture |
| 23 | BUSY | Conversion status - high during conversion, falls at completion to signal data readiness |
| 24 | VDD | +5 V analog/digital supply - shared rail requires local 0.1 µF ceramic decoupling at pin |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling & conversion | Preserves phase relationship between VA1/VA2 or VB1/VB2 - essential for vector-controlled AC motor drives |
| Aperture delay matching | ≤200 ps between channels - enables sub-degree phase error in synchronized current/voltage measurement |
| Overvoltage protection | +7 V absolute max on analog inputs - withstands transient surges without latch-up or damage |
| Internal +2.5 V reference | ±25 mV total error over –40°C to +85°C - eliminates external reference component and layout complexity |
| Low-power auto-sleep mode | 75 µW standby dissipation - extends battery life in portable test equipment and field instruments |
| High-speed parallel interface | Compatible with 8051, DSP, and FPGA buses - avoids serialization latency in real-time control loops |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Real-time sampling of phase voltage and current in three-phase inverter legs for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC capturing synchronized VA1 (voltage) and VA2 (current) within same 3.6 µs window to preserve torque-angle correlation. Use Value: Enables accurate flux estimation and torque regulation without interpolation artifacts caused by staggered sampling. |
Use Scenario: Monitoring input AC line voltage and DC bus voltage during transfer switching and battery charging cycles. IC Role / Device Role / Timing Role: Simultaneously acquires VA1 (line voltage) and VB1 (bus voltage) to detect zero-crossing alignment and regulate PWM duty cycle. Use Value: Prevents phase misalignment errors in grid-synchronization logic, improving transfer reliability and reducing inrush transients. |
| Data Acquisition Systems | Industrial Process Monitoring |
Use Scenario: Multi-sensor monitoring in PLC-based systems measuring temperature, pressure, and flow with shared timing reference. IC Role / Device Role / Timing Role: Provides two independent 12-bit acquisition paths (Channel A and B) with matched aperture delay for correlated measurements. Use Value: Eliminates inter-channel skew in time-domain analysis of mechanical resonance or fluid dynamics events. |
Use Scenario: Closed-loop control of servo-valves in hydraulic systems using position feedback and pressure feedback. IC Role / Device Role / Timing Role: Samples VA1 (valve position) and VB1 (system pressure) simultaneously to compute derivative-based control actions. Use Value: Reduces control loop jitter by removing sample-timing uncertainty between feedback variables. |
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-2REEL | 14-bit resolution, same pinout and interface, identical 0–2.5 V input range and timing | Higher resolution required for precision metrology or high-dynamic-range sensor conditioning | Select when ≥13-bit ENOB is mandatory and PCB layout cannot change |
| ADS8325IPW | Single 16-bit SAR ADC, serial SPI interface, no simultaneous sampling capability | Lower channel count, space-constrained designs where phase coherence is not required | Choose for cost-sensitive, low-channel-count applications with relaxed timing constraints |
Compared with AD7862ARSZ-2REEL, AD7863ARSZ-2REEL offers higher resolution without layout changes, while ADS8325IPW trades simultaneous sampling for smaller footprint and lower power-but requires redesign for timing-critical dual-channel use cases.
Availability
AD7862ARSZ-2REEL 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 AD7862ARSZ-2REEL 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 belongs to Analog Devices' precision simultaneous-sampling ADC product line, engineered specifically for real-time control and measurement systems demanding phase-coherent multi-channel acquisition in industrial automation and power electronics.
FAQ
What is the input voltage range supported by the AD7862ARSZ-2REEL?
The AD7862ARSZ-2REEL supports a unipolar 0 V to +2.5 V analog input range, optimized for direct interfacing with sensors and signal-conditioning circuits operating at 2.5 V full scale. This differs from the ±10 V (AD7862-10) and ±2.5 V (AD7862-3) versions. Input current is limited to 500 nA max, ensuring minimal loading on source impedances up to 100 kΩ. The AD7862ARSZ-2REEL uses straight binary output coding, not twos complement.
How does the AD7862ARSZ-2REEL achieve simultaneous sampling across two channels?
The AD7862ARSZ-2REEL achieves simultaneous sampling using two matched track-and-hold amplifiers triggered by the falling edge of the CONVST signal. Both amplifiers enter hold mode at the same instant, freezing the analog inputs VA1/VA2 (Channel A) or VB1/VB2 (Channel B) with ≤200 ps aperture delay mismatch. Conversion then proceeds in parallel, completing in 3.6 µs. This preserves phase relationships critical for vector control and power quality analysis.
Can the AD7862ARSZ-2REEL use an external reference, and what are the requirements?
Yes, the AD7862ARSZ-2REEL can accept an external +2.5 V reference via the VREF pin. The internal reference is overdriven when an external source is applied. The reference input is buffered and accepts ±100 µA max input current. Recommended sources include the AD780 or REF43, which provide tighter initial tolerance and lower temperature drift than the internal ±10 mV (±25 mV over temp) reference. A 0.1 µF ceramic capacitor must still be placed from VREF to AGND.
What is the purpose of the A0 pin on the AD7862ARSZ-2REEL?
The A0 pin on the AD7862ARSZ-2REEL serves as the channel-pair multiplexer select. When A0 is logic low during CS and RD assertion, the first read accesses VA1 or VB1 (depending on prior A0 state), and the second read accesses VA2 or VB2. Setting A0 high selects Channel B (VB1/VB2); setting it low selects Channel A (VA1/VA2). This allows sequential access to both inputs per channel without reconfiguring hardware connections.
Is the AD7862ARSZ-2REEL pin-compatible with other AD7862 variants?
Yes, the AD7862ARSZ-2REEL shares identical 28-lead SSOP pinout and interface timing with all AD7862 variants (e.g., AD7862ARSZ-10, AD7862ARSZ-3), including CONVST, BUSY, CS, RD, A0, and DB0–DB11. However, input range, output coding (straight binary vs. twos complement), and internal resistor networks differ. Swapping variants requires verifying analog front-end compatibility and firmware handling of code format and range scaling.
AD7862ARSZ-2REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-2REEL FAQ
1.How can I place an order for AD7862ARSZ-2REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862ARSZ-2REEL 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-2REEL reliable?
The price and inventory of AD7862ARSZ-2REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862ARSZ-2REEL is usually 5 days.
3.What payment methods are accepted for AD7862ARSZ-2REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862ARSZ-2REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862ARSZ-2REEL?
AD7862ARSZ-2REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862ARSZ-2REEL 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-2REEL?
For technical support, including AD7862ARSZ-2REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862ARSZ-2REEL requirements.
6.How does Aetrix verify that AD7862ARSZ-2REEL is sourced from the original manufacturer or authorized distributors?
All AD7862ARSZ-2REEL 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-2REEL meets industry standards.
7.What is the process for return or replacement of AD7862ARSZ-2REEL?
All AD7862ARSZ-2REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7862ARSZ-2REEL, 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-2REEL part is unused and in its original packaging.
Return procedure for AD7862ARSZ-2REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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