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Analog Devices Inc. AD7862BRZ-3
- Part No.:
- AD7862BRZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7862BRZ-3.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
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Product details
Overview
AD7862BRZ-3 from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter (ADC) with ±2.5 V input range, 250 kSPS throughput, 3.6 µs conversion time, and integrated +2.5 V reference. It preserves phase coherence between channel A (VA1/VA2) and channel B (VB1/VB2) for synchronized acquisition in motor control and power monitoring systems.
For engineers reviewing the AD7862BRZ-3 datasheet, AD7862BRZ-3 pinout, AD7862BRZ-3 application, or AD7862BRZ-3 equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-channel timing behavior, real-world use cases in AC motor control and UPS systems, and two technically documented alternative parts with explicit functional and interface differences.
Technical Context
The AD7862BRZ-3 implements two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling across four analog inputs (VA1/VA2/VB1/VB2) grouped into two channels. Its internal laser-trimmed clock oscillator eliminates external timing components, and aperture delay matching of ≤200 ps ensures sub-degree phase alignment between channels.
It uses a high-speed parallel 12-bit TTL-compatible interface with CS/RD/CONVST control logic and twos-complement output coding. The device operates from a single +5 V supply, enters automatic power-down after conversion (75 µW standby), and features overvoltage protection up to ±7 V on analog inputs without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes and supports 4096 distinct digital output levels |
| Sampling Rate | 250 kSPS - enables real-time capture of signals up to 125 kHz (Nyquist-limited) |
| Analog Input Range | ±2.5 V - optimized for signal processing applications requiring bipolar dynamic range |
| Conversion Time | 3.6 µs - determines minimum inter-conversion interval and maximum sustained throughput |
| Relative Accuracy | ±1 LSB max - ensures end-point linearity error remains within one quantization step |
| Signal-to-(Noise+Distortion) | 70 dB min at 100 kHz - defines usable dynamic range for medium-frequency AC signals |
| Power Dissipation | 60 mW typ - supports low-thermal-load designs in compact industrial enclosures |
Pinout & Package
AD7862BRZ-3 is housed in a 28-lead SOIC package (R-28 footprint), with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | No Connect | Unused pins; must remain unconnected per datasheet |
| 2–6, 9–15 | DB11–DB0 | 12-bit parallel data bus (MSB DB11 → LSB DB0); three-state TTL outputs with twos-complement coding |
| 7 | DGND | Digital ground reference for logic circuitry and data bus drivers |
| 8 | CONVST | Active-low conversion start trigger; falling edge initiates simultaneous hold and conversion on both channels |
| 16, 27 | AGND | Analog ground reference for multiplexer, track/hold, reference, and ADC core |
| 17, 18, 25, 26 | VB2, VA2, VA1, VB1 | Four analog inputs grouped as Channel A (VA1/VA2) and Channel B (VB1/VB2); ±2.5 V range with ±7 V overvoltage tolerance |
| 19 | VREF | Reference I/O pin; supplies or accepts +2.5 V ±5% reference; internal buffer provides 2 kΩ output impedance |
| 20 | A0 | Multiplexer select; controls read sequence: A0 low → VA1/VB1 first, A0 high → VA2/VB2 second |
| 21 | CS | Chip select; active-low enable for data bus and internal control logic |
| 22 | RD | Read strobe; active-low signal that latches valid data onto DB11–DB0 bus |
| 23 | BUSY | Open-drain status indicator; high during conversion, low when results are ready to read |
| 24 | VDD | +5 V ±5% analog/digital supply; powers all internal blocks including reference and logic |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling & conversion | Preserves phase relationship between VA1/VA2 and VB1/VB2 with ≤200 ps aperture delay matching |
| Integrated +2.5 V reference | ±10 mV initial error and 25 ppm/°C drift enable stable gain calibration without external components |
| Overvoltage protected analog inputs | Withstands ±7 V transients on VA1/VA2/VB1/VB2 without latch-up or parametric shift |
| Auto power-down mode | Reduces standby current to 25 µA and dissipation to 75 µW, extending battery life in portable DAQ |
| High-speed parallel interface | Supports direct connection to microcontrollers and DSPs with standard CS/RD handshaking and <60 ns data access |
Applications
| AC Motor Control | Uninterruptible Power Supplies (UPS) |
|---|---|
Use Scenario: Real-time acquisition of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling captures current and voltage waveforms with preserved phase alignment for precise vector control. Use Value: Enables accurate field-oriented control (FOC) by eliminating inter-channel timing skew that would distort torque estimation. |
Use Scenario: Monitoring input AC waveform, battery voltage, and inverter output during grid failure and switchover events. IC Role / Device Role / Timing Role: Synchronized sampling of line voltage and load current ensures correct RMS calculation and harmonic analysis during transient conditions. Use Value: Maintains measurement integrity during millisecond-scale transfer switching, preventing false overload trips or misregulated output. |
| Data Acquisition Systems | Communications Baseband Processing |
Use Scenario: Multi-channel vibration and temperature monitoring in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Simultaneous capture of accelerometer X/Y/Z axes and thermal sensor outputs on shared sample clock. Use Value: Eliminates phase-induced cross-talk in FFT-based spectral analysis, improving fault signature detection accuracy. |
Use Scenario: Digitizing I/Q baseband signals from RF front-ends in software-defined radio receivers. IC Role / Device Role / Timing Role: Dual ADC channels acquire in-phase (I) and quadrature (Q) signal paths with matched group delay. Use Value: Prevents image frequency distortion and EVM degradation caused by channel-to-channel sampling skew. |
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-3 | 14-bit resolution, same pinout and interface, but higher power (100 mW typ) and no auto power-down mode | Required where >70 dB SNR or finer amplitude resolution is needed; unsuitable for battery-powered operation | Select AD7863ARZ-3 only when 14-bit precision justifies increased power and cost; verify layout compatibility with identical R-28 footprint |
| ADS8325IPW | Single 16-bit SAR ADC with serial SPI interface, no simultaneous sampling, ±2.5 V range, 100 kSPS max | Applicable only for non-phase-critical, lower-throughput applications; requires external synchronization for dual-channel use | Choose ADS8325IPW if resolution >12-bit is mandatory and phase coherence is not required; redesign interface and timing logic |
Compared with AD7862BRZ-3, AD7863ARZ-3 delivers higher resolution at the cost of power efficiency and sleep capability, while ADS8325IPW trades simultaneous sampling and speed for greater bit depth and serial simplicity-neither offers drop-in replacement capability due to architectural and interface divergence.
Availability
AD7862BRZ-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 traceable sourcing.
Supply support for AD7862BRZ-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 global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7862BRZ-3 belongs to Analog Devices' precision dual-sampling ADC product line, engineered specifically for industrial automation and power electronics applications demanding phase-coherent multi-channel acquisition under harsh electrical conditions.
FAQ
What is the analog input voltage range supported by the AD7862BRZ-3?
The AD7862BRZ-3 supports a bipolar ±2.5 V analog input range across all four inputs (VA1, VA2, VB1, VB2). This range is factory-configured and cannot be reconfigured. Overvoltage protection allows inputs to tolerate up to ±7 V without damage, making it robust in noisy industrial environments where transient spikes occur.
Does the AD7862BRZ-3 require an external reference voltage?
No, the AD7862BRZ-3 includes an internal +2.5 V reference with ±10 mV initial error and 25 ppm/°C temperature coefficient. The VREF pin can be used as an output (with 0.1 µF decoupling to AGND) or accept an external +2.5 V reference for improved accuracy. Using the internal reference eliminates BOM cost and board space for external references in most applications.
How does the AD7862BRZ-3 achieve simultaneous sampling across two channels?
The AD7862BRZ-3 achieves true simultaneous sampling using two matched track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same instant, capturing VA1/VA2 and VB1/VB2 concurrently. Aperture delay matching is guaranteed ≤200 ps, preserving relative phase information critical for vector control and power quality analysis.
What is the function of the A0 pin on the AD7862BRZ-3?
The A0 pin on the AD7862BRZ-3 selects which pair of conversion results is presented on the data bus during sequential reads. When A0 is low, the first RD pulse after conversion outputs VA1 (Channel A, Input 1) or VB1 (Channel B, Input 1); when A0 is high, the second RD pulse outputs VA2 or VB2. This enables efficient interleaved reading without additional address lines.
Can the AD7862BRZ-3 operate from a single +5 V supply?
Yes, the AD7862BRZ-3 operates exclusively from a single +5 V ±5% supply (VDD = +5 V) applied to Pin 24. This supply powers both analog and digital sections, including the internal reference and parallel interface drivers. No negative or auxiliary supplies are required, simplifying power architecture in space-constrained industrial modules.
AD7862BRZ-3 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:
- -
AD7862BRZ-3 FAQ
1.How can I place an order for AD7862BRZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862BRZ-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 AD7862BRZ-3 reliable?
The price and inventory of AD7862BRZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862BRZ-3 is usually 5 days.
3.What payment methods are accepted for AD7862BRZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862BRZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862BRZ-3?
AD7862BRZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862BRZ-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 AD7862BRZ-3?
For technical support, including AD7862BRZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862BRZ-3 requirements.
6.How does Aetrix verify that AD7862BRZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7862BRZ-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 AD7862BRZ-3 meets industry standards.
7.What is the process for return or replacement of AD7862BRZ-3?
All AD7862BRZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862BRZ-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 AD7862BRZ-3 part is unused and in its original packaging.
Return procedure for AD7862BRZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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