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Analog Devices Inc. AD7862ARZ-2
- Part No.:
- AD7862ARZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7862ARZ-2.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
AD7862ARZ-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), 3.6 µs conversion time, ±1 LSB relative accuracy, 0 V to +2.5 V unipolar input range, and integrated +2.5 V reference - used in motor control feedback loops requiring phase-coherent voltage/current sampling.
For engineers reviewing the AD7862ARZ-2 datasheet, AD7862ARZ-2 pinout, AD7862ARZ-2 application, or AD7862ARZ-2 equivalent, this page delivers verified technical context, real-world timing behavior, channel-isolation performance, power-down mode operation, and direct alternatives for industrial data acquisition systems.
Technical Context
The AD7862ARZ-2 implements two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2 pairs on falling edge of CONVST. Its internal laser-trimmed clock eliminates external timing components and ensures 3.6 µs deterministic conversion latency across both channels.
It uses straight (natural) binary output coding for unipolar 0 V–2.5 V inputs, features 200 ps aperture delay matching between channels, and supports high-speed parallel readout via 12-bit TTL-compatible DB0–DB11 bus with CS/RD handshaking - all operating from a single +5 V supply with 60 mW typical power consumption.
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 timing for real-time control loops. |
| Analog Input Range | 0 V to +2.5 V - optimized for unipolar sensor outputs and DAC-driven signal chains without level-shifting circuitry. |
| Relative Accuracy | ±1 LSB max - ensures end-point linearity within 0.024% FSR for precision measurement applications. |
| Channel Isolation | –80 dB max - prevents crosstalk-induced phase error between simultaneously sampled current/voltage signals. |
| Aperture Delay Matching | 200 ps typ - preserves sub-degree phase coherence between dual-channel inputs critical for vector control algorithms. |
| Power Dissipation | 60 mW typ at 250 kSPS - supports thermally constrained embedded designs without active cooling. |
Pinout & Package
AD7862ARZ-2 is housed in a 28-lead SOIC (Small Outline Integrated Circuit) package with standard 0.3-inch body width and gull-wing leads. Pin 1 is located at top-left corner when viewed from top with marking dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | NC | No connect - must remain floating; no internal connection or thermal function. |
| 2–6, 9–15 | DB11–DB0 | 12-bit parallel data bus - three-state TTL outputs delivering straight binary codes after RD assertion. |
| 7 | DGND | Digital ground reference - separate from AGND to minimize digital noise coupling into analog path. |
| 8 | CONVST | Convert start trigger - falling edge initiates simultaneous track-to-hold transition and dual-conversion sequence. |
| 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 - grouped as Channel A (VA1/VA2) and Channel B (VB1/VB2); each pair sampled simultaneously. |
| 19 | VREF | Reference I/O - provides or accepts +2.5 V reference; internal buffer has 2 kΩ output impedance and ±25 mV total error over temperature. |
| 20 | A0 | Multiplexer select - controls read sequence: A0 low reads VA1/VB1 first; A0 high reads VA2/VB2 first. |
| 21 | CS | Chip select - active-low enable for parallel interface; must be asserted before RD to activate data bus. |
| 22 | RD | Read strobe - active-low signal that latches conversion result onto DB11–DB0 bus; timing-critical for valid data capture. |
| 23 | BUSY | Status output - high during conversion; falls at completion to signal readiness of both channel results. |
| 24 | VDD | +5 V ±5% supply - powers analog and digital sections; decoupling capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling & conversion | Preserves phase relationship between dual analog inputs - essential for vector-controlled AC drives and power quality analyzers. |
| Integrated +2.5 V reference | ±10 mV initial error and 25 ppm/°C drift - eliminates need for external reference in cost-sensitive industrial sensors. |
| Overvoltage protection | +7 V absolute max on analog inputs - withstands transient surges in motor drive and UPS environments without damage. |
| Auto power-down mode | Reduces standby current to 25 µA - extends battery life in portable test equipment and field-deployed DAQ units. |
| High-speed parallel interface | Supports 250 kSPS sustained read rate with <60 ns data access time - interfaces directly to legacy microcontrollers without FIFO buffering. |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Real-time sampling of phase voltage and current in three-phase inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC captures voltage and current waveforms with <200 ps inter-channel skew to compute accurate torque and flux vectors. Use Value: Enables sub-microsecond phase alignment for precise PWM modulation and reduced torque ripple in servo drives. |
Use Scenario: Monitoring input/output AC waveforms and DC bus voltage during grid failure and battery switchover events. IC Role / Device Role / Timing Role: Synchronized sampling of line voltage and load current preserves zero-crossing timing integrity for seamless transfer logic. Use Value: Eliminates phase-induced measurement error in RMS calculation and harmonic distortion analysis during transient transitions. |
| Data Acquisition Systems | Industrial Communications Interfaces |
Use Scenario: High-fidelity acquisition of vibration, temperature, and pressure signals from rotating machinery in predictive maintenance nodes. IC Role / Device Role / Timing Role: Simultaneous dual-channel sampling captures correlated mechanical transients (e.g., bearing defect frequencies) without time-skew artifacts. Use Value: Delivers phase-coherent time-domain data required for FFT-based spectral analysis and envelope detection algorithms. |
Use Scenario: Signal conditioning front-end for PROFIBUS DP or Modbus RTU gateways interfacing analog field devices. IC Role / Device Role / Timing Role: Converts analog sensor outputs to digital values synchronized to master clock for deterministic cyclic data exchange. Use Value: Ensures timestamp-aligned measurements across distributed I/O modules in time-critical automation networks. |
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 |
|---|---|---|---|
| AD7863ARZ-2 | 14-bit resolution, same pinout and interface; higher SNR (74 dB vs. 70 dB), identical 0 V–2.5 V input range and timing. | Required where 0.006% FSR resolution is needed for high-dynamic-range sensor digitization (e.g., strain gauge bridges). | Select AD7863ARZ-2 when 14-bit precision justifies marginal cost increase and board layout reuse is prioritized. |
| ADS8325IPW | Single 16-bit SAR ADC, serial SPI interface, no simultaneous sampling; 0 V–5 V input range, 100 kSPS max. | Suitable for non-phase-critical applications like environmental monitoring where resolution >12-bit suffices and space is constrained. | Choose ADS8325IPW only if dual-channel simultaneity is unnecessary and system already uses SPI infrastructure. |
Compared with AD7862ARZ-2, AD7863ARZ-2 offers higher resolution with drop-in compatibility, while ADS8325IPW trades simultaneity and parallel speed for compactness and extended resolution - making AD7862ARZ-2 optimal for cost-sensitive, phase-critical industrial control where 12-bit fidelity meets design requirements.
Availability
AD7862ARZ-2 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 AD7862ARZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7862 product line delivers simultaneous-sampling dual ADCs for real-time control and measurement applications where phase coherence, low latency, and single-supply operation are mandatory - targeting motor drives, power converters, and automated test equipment.
FAQ
What is the analog input voltage range supported by the AD7862ARZ-2?
The AD7862ARZ-2 supports a unipolar 0 V to +2.5 V analog input range, optimized for sensors and signal sources referenced to ground. This differs from the AD7862-10 (±10 V) and AD7862-3 (±2.5 V) variants. Input current is limited to 500 nA max, enabling direct connection to high-impedance sources without buffering. The device includes overvoltage protection up to +7 V on all analog inputs.
Does the AD7862ARZ-2 require an external reference voltage?
No, the AD7862ARZ-2 includes an internal +2.5 V reference with ±10 mV accuracy at +25°C and ±25 mV max error over temperature. To use it, connect a 0.1 µF ceramic capacitor from VREF to AGND. An external +2.5 V reference (e.g., AD780 or REF43) may be applied to VREF to improve accuracy, but is not required for basic operation of the AD7862ARZ-2.
How does the AD7862ARZ-2 achieve simultaneous sampling across two channels?
The AD7862ARZ-2 achieves true simultaneous sampling using two matched track-and-hold amplifiers triggered by the same CONVST falling edge. Both amplifiers enter hold mode at precisely the same time, freezing their respective input voltages (e.g., VA1/VA2 or VB1/VB2) before conversion begins. Aperture delay matching is specified at 200 ps typ, ensuring sub-degree phase coherence critical for vector control algorithms.
What is the output data format of the AD7862ARZ-2?
The AD7862ARZ-2 outputs straight (natural) binary code on its 12-bit parallel bus (DB0–DB11), unlike the two's complement format used by AD7862-10 and AD7862-3. For a 0 V–2.5 V input range, full-scale corresponds to decimal 4095 (0xFFF), with 1 LSB = 0.61 mV. Data is read sequentially: first RD accesses VA1 or VB1; second RD accesses VA2 or VB2, depending on A0 state.
Can the AD7862ARZ-2 operate from a single +5 V supply?
Yes, the AD7862ARZ-2 operates exclusively from a single +5 V ±5% supply (VDD), powering both analog and digital sections. It consumes 60 mW typical during active conversion and drops to 75 µW in auto power-down mode. No negative or auxiliary supplies are needed - simplifying power design for embedded controllers and portable instrumentation using the AD7862ARZ-2.
AD7862ARZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7862ARZ-2 FAQ
1.How can I place an order for AD7862ARZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862ARZ-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 AD7862ARZ-2 reliable?
The price and inventory of AD7862ARZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862ARZ-2 is usually 5 days.
3.What payment methods are accepted for AD7862ARZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862ARZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862ARZ-2?
AD7862ARZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862ARZ-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 AD7862ARZ-2?
For technical support, including AD7862ARZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862ARZ-2 requirements.
6.How does Aetrix verify that AD7862ARZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7862ARZ-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 AD7862ARZ-2 meets industry standards.
7.What is the process for return or replacement of AD7862ARZ-2?
All AD7862ARZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862ARZ-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 AD7862ARZ-2 part is unused and in its original packaging.
Return procedure for AD7862ARZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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