My Inquiry
My Account
Analog Devices Inc. AD7862BR-3
- Part No.:
- AD7862BR-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7862BR-3.pdf
- Description:
- IC ADC 12BIT DUAL 250KSPS 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7862BR-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 AD7862BR-3 datasheet, AD7862BR-3 pinout, AD7862BR-3 application, or AD7862BR-3 equivalent, this page delivers verified specifications, validated pin functions, confirmed timing behavior, and real-world use context - all grounded in Analog Devices' official documentation for the BR-3 variant.
Technical Context
The AD7862BR-3 implements two independent 4 µs successive approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling across four analog inputs (VA1/VA2/VB1/VB2). Its aperture delay matching is ≤200 ps, and small-signal bandwidth exceeds 3 MHz - critical for preserving inter-channel phase integrity in AC motor current sensing.
It uses an internal laser-trimmed clock oscillator and supports high-speed parallel readout via 12-bit TTL-compatible outputs (DB0–DB11), with CS/RD/CONVST/BUSY control logic. The device operates from a single +5 V supply and enters automatic power-down mode post-conversion, drawing only 25 µA in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic output with no missing codes over full temperature range. |
| Sampling Rate | 250 kSPS - supports real-time capture of 100 kHz sine waves with ≥70 dB SNR. |
| Analog Input Range | ±2.5 V - optimized for signal processing applications requiring bipolar dynamic range without external scaling. |
| Conversion Time | 3.6 µs max - enables deterministic latency for closed-loop control timing budgets. |
| Relative Accuracy | ±1 LSB max - ensures endpoint linearity within 0.024% FSR for precision measurement. |
| Channel Isolation | –80 dB max - prevents crosstalk-induced error when monitoring differential motor phases. |
| Power Dissipation | 60 mW typ at 250 kSPS - suitable for thermally constrained industrial modules. |
Pinout & Package
AD7862BR-3 is housed in a 28-lead Small Outline Package (SOIC, R-28) with exposed pad thermal enhancement per Analog Devices' ordering guide. Pin 1 and Pin 28 are No Connect (NC); Pins 16 and 27 are AGND; Pin 7 is DGND; Pin 24 is VDD (+5 V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (Pin 8) | Convert Start Input | Falling-edge-triggered global sample command - simultaneously freezes both track/holds to preserve inter-channel phase alignment. |
| BUSY (Pin 23) | Conversion Status Output | Active-high open-drain signal indicating conversion in progress; goes low when both 12-bit results are latched and ready for read. |
| A0 (Pin 20) | Multiplexer Select | Controls read sequence: A0 low → first RD reads VA1/VB1; A0 high → second RD reads VA2/VB2 - enables interleaved dual-channel data access. |
| VREF (Pin 19) | Reference I/O | Provides buffered +2.5 V internal reference (±10 mV @ 25°C); also accepts external 2.5 V reference to override internal source for improved accuracy. |
| VA1/VA2/VB1/VB2 (Pins 25/18/26/17) | Analog Inputs | Four dedicated inputs grouped into two synchronous channels (A and B), each supporting ±2.5 V range with ±7 V overvoltage tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two matched track/hold amplifiers with ≤200 ps aperture delay matching - preserves phase relationship between VA and VB channels for vector-controlled drives. |
| Integrated Reference | +2.5 V internal reference with 25 ppm/°C tempco and ±25 mV total error over –40°C to +85°C - eliminates need for external reference in cost-sensitive designs. |
| Overvoltage Protection | ±7 V absolute max on analog inputs - withstands transient surges common in industrial motor drive feedback paths without latch-up or damage. |
| Low-Power Auto-Sleep | Reduces IDD to 25 µA between conversions - extends battery life in portable power analyzers and reduces thermal load in dense PCB layouts. |
| High-Speed Parallel Interface | 12-bit TTL-compatible bus with 60 ns data access time - interfaces directly to legacy microcontrollers (e.g., 8051, TMS320C2xx) without glue logic. |
Applications
| AC Motor Current Sensing | Uninterruptible Power Supply (UPS) Monitoring |
|---|---|
Use Scenario: Real-time sampling of phase currents in three-phase inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC capturing IA and IB at exact same instant to compute rotor flux angle. Use Value: Aperture matching ≤200 ps ensures <0.1° phase error at 1 kHz - critical for torque ripple reduction in servo drives. |
Use Scenario: Continuous monitoring of input AC voltage, output DC bus, and battery voltage in online UPS systems. IC Role / Device Role / Timing Role: Simultaneous acquisition of line voltage and rectified DC to detect sag/swell events with precise time correlation. Use Value: 250 kSPS throughput enables 10-sample cycle detection at 50/60 Hz - meeting IEC 62040-3 fast transient response requirements. |
| Data Acquisition for Power Quality | Communications Baseband Signal Digitization |
Use Scenario: Capturing harmonics up to 50th order (3 kHz @ 60 Hz) in utility-grade PQ analyzers. IC Role / Device Role / Timing Role: Dual ADC digitizing voltage and current waveforms synchronously to compute THD, interharmonics, and flicker. Use Value: –78 dB THD and –85 dB peak spurious noise support IEEE 1159-compliant Class A measurement accuracy. |
Use Scenario: Digitizing baseband I/Q signals in narrowband wireless modems (e.g., NB-IoT, LoRa gateways). IC Role / Device Role / Timing Role: Simultaneous sampling of in-phase and quadrature analog paths prior to digital modulation. Use Value: Channel isolation >80 dB prevents I/Q crosstalk that would degrade EVM in QPSK/QAM constellations. |
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 and interface; higher SNR (74 dB), longer conversion time (4.5 µs). | Required where 0.006% FSR resolution is needed (e.g., high-accuracy energy metering), not for standard motor control. | Select AD7863AR-3 only if 14-bit precision justifies added cost and slightly reduced speed. |
| ADS8325IPFB | Single 16-bit SAR ADC, serial SPI interface, no simultaneous sampling; 100 kSPS, ±10 V range. | Suitable for non-synchronous, lower-speed measurements (e.g., sensor calibration), not phase-critical dual-channel acquisition. | Choose ADS8325IPFB only for space-constrained designs needing higher resolution without inter-channel timing constraints. |
Compared with AD7862BR-3, AD7863AR-3 offers higher resolution at the expense of 25% slower conversion, while ADS8325IPFB sacrifices simultaneity and speed for 16-bit depth and serial simplicity - neither is pin-compatible, and both require layout changes and firmware adaptation.
Availability
AD7862BR-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 AD7862BR-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 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 designed specifically for industrial and instrumentation applications demanding synchronized multi-channel acquisition, such as motor drives, power quality analyzers, and automated test equipment - emphasizing timing fidelity, robustness, and single-supply operation.
FAQ
What is the analog input voltage range supported by the AD7862BR-3?
The AD7862BR-3 supports a bipolar ±2.5 V analog input range across all four inputs (VA1, VA2, VB1, VB2), with overvoltage tolerance up to ±7 V. This range is factory-configured and cannot be reconfigured - it differs from the ±10 V range of the AD7862BR-10 and the 0 V to +2.5 V range of the AD7862BR-2. The AD7862BR-3 uses twos complement output coding.
How does the AD7862BR-3 achieve simultaneous sampling across two channels?
The AD7862BR-3 achieves true simultaneous sampling using two physically matched track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same instant, with aperture delay matching ≤200 ps - ensuring phase coherence between VA and VB channel acquisitions. This is verified in the AD7862 datasheet's "Aperture Delay Matching" specification.
Can the AD7862BR-3 operate with an external reference voltage?
Yes, the AD7862BR-3 can use an external +2.5 V reference applied to the VREF pin (Pin 19), which overrides the internal reference. The reference input is buffered and accepts ±100 µA, making it compatible with precision references like the AD780 or REF43. Using an external reference improves gain accuracy and temperature stability beyond the internal ±25 mV total error.
What is the power consumption of the AD7862BR-3 during active conversion?
The AD7862BR-3 consumes 60 mW typical (15 mA at +5 V) during normal conversion operation, and drops to 75 µW typical (25 µA) in standby mode after conversion completes. This automatic power-down behavior is inherent to the part's design and requires no software control - it resumes full operation before the next CONVST pulse.
Is the AD7862BR-3 pin-compatible with other variants in the AD7862 family?
Yes, all AD7862 variants - including AD7862BR-3, AD7862BR-10, and AD7862BR-2 - share identical 28-pin SOIC (R-28) pinouts and parallel interface timing. However, input ranges, output coding (twos complement vs. straight binary), and internal scaling resistors differ - so PCB layout is interchangeable, but system-level signal conditioning and firmware interpretation must match the specific variant's configuration.
AD7862BR-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7862BR-3 FAQ
1.How can I place an order for AD7862BR-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7862BR-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 AD7862BR-3 reliable?
The price and inventory of AD7862BR-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7862BR-3 is usually 5 days.
3.What payment methods are accepted for AD7862BR-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7862BR-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7862BR-3?
AD7862BR-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7862BR-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 AD7862BR-3?
For technical support, including AD7862BR-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7862BR-3 requirements.
6.How does Aetrix verify that AD7862BR-3 is sourced from the original manufacturer or authorized distributors?
All AD7862BR-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 AD7862BR-3 meets industry standards.
7.What is the process for return or replacement of AD7862BR-3?
All AD7862BR-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7862BR-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 AD7862BR-3 part is unused and in its original packaging.
Return procedure for AD7862BR-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7862BR-3 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
