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Analog Devices Inc. AD7866BRUZ-REEL
- Part No.:
- AD7866BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7866BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
AD7866BRUZ-REEL from Analog Devices is a dual-channel, 12-bit, 1 MSPS successive approximation ADC with integrated 2.5 V reference, simultaneous sampling capability, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface. It operates from a single 2.7 V to 5.25 V supply, delivers 70 dB SNR at 300 kHz input, and supports –40°C to +125°C industrial operation in a 20-lead TSSOP package - ideal for high-speed data acquisition in motor control feedback loops.
For engineers reviewing the AD7866BRUZ-REEL datasheet, AD7866BRUZ-REEL pinout, AD7866BRUZ-REEL application, or AD7866BRUZ-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for volume deployment in embedded industrial systems.
Technical Context
The AD7866BRUZ-REEL integrates two independent 12-bit SAR ADCs, each with a wide-bandwidth track-and-hold amplifier (12 MHz full-power bandwidth) and separate analog input pairs (VA1/VA2, VB1/VB2). Conversion is initiated on the falling edge of CS, with timing fully controlled by SCLK - no pipeline delay, no latency beyond 16 SCLK cycles (800 ns at 20 MHz).
It supports flexible reference configuration: internal 2.5 V reference (±1% initial accuracy, 50 ppm/°C drift), external reference via VREF, or dual independent external references via DCAPA/DCAPB. Input range is selectable per conversion as 0 V to VREF (straight binary) or –VREF to +VREF (twos complement) using the RANGE pin sampled at CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = 0.244 mV (for 0–2.5 V range) or 0.122 mV (for 0–1.25 V range), enabling precise current/voltage sensing in closed-loop control. |
| Throughput Rate | 1 MSPS maximum - supports real-time sampling of 300 kHz sinusoidal signals with ≥70 dB SNR, sufficient for Class I power quality monitoring per IEC 61000-4-30. |
| Power Consumption | 11.4 mW max at 3 V / 1 MSPS - enables battery-backed or energy-constrained edge nodes without thermal derating in compact enclosures. |
| Channel Isolation | –88 dB typical - ensures minimal crosstalk between simultaneously sampled channels, critical for differential sensor pairs or phase-separated motor phase measurements. |
| Integral Nonlinearity | ±1 LSB max (B grade, 0 V to VREF range) - guarantees monotonicity and <0.025% end-point error for calibration-critical applications like precision transducer interfaces. |
| Reference Accuracy | 2.5 V ±1%, 50 ppm/°C drift - eliminates need for external reference trimming in temperature-stable industrial environments up to +125°C. |
| Aperture Jitter | 50 ps typical - limits SNR degradation to <0.1 dB at 300 kHz input, preserving dynamic performance without external clock conditioning. |
Pinout & Package
AD7866BRUZ-REEL is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm × 1.2 mm body, 0.65 mm pitch, moisture sensitivity level 3 (MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF SELECT) | Reference mode control | Logic input selecting internal 2.5 V reference (low) or external reference (high); determines decoupling topology for VREF/DCAPA/DCAPB. |
| 2, 9 (DCAPB, DCAPA) | ADC B/A reference buffer decoupling | Connect 10 µF + 0.1 µF capacitors; also serve as outputs for internal reference distribution or inputs for independent external references per ADC. |
| 4–7 (VB2, VB1, VA2, VA1) | Analog inputs | Four single-ended channels - A0 pin selects VA1/VB1 (low) or VA2/VB2 (high) for simultaneous dual-channel conversion. |
| 11 (RANGE) | Input range & coding select | Samples at CS fall: low → 0–VREF + straight binary; high → –VREF to +VREF + twos complement; reconfigurable mid-conversion. |
| 15–16 (DOUTA, DOUTB) | Serial data outputs | Simultaneous 16-bit frames (1 zero + 3 status + 12 data bits, MSB first); allow independent readout or daisy-chained single-port access. |
| 19 (CS) | Chip select / conversion trigger | Active-low signal initiating sampling on falling edge and framing serial data transfer - enables deterministic timing in deterministic real-time systems. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Enables true time-aligned capture of voltage/current pairs in motor drives or differential sensor arrays without inter-channel skew. |
| No pipeline delay | Guarantees deterministic 16-SCLK conversion latency (800 ns @ 20 MHz), essential for fast-loop digital control (e.g., field-oriented control at >20 kHz PWM). |
| Flexible power/throughput scaling | Power scales linearly with SCLK frequency - reducing SCLK from 20 MHz to 2 MHz cuts IDD from 3.8 mA to ~0.5 mA while maintaining functionality. |
| Three power-down modes | Full shutdown draws ≤1 µA (–40°C to +85°C), enabling wake-on-external-trigger architectures in always-on industrial gateways. |
| On-board 2.5 V reference | Eliminates external reference IC and associated layout complexity; ±15 mV total error over –40°C to +125°C ensures stable calibration across temperature extremes. |
Applications
| Motor Phase Current Sensing | Industrial Data Acquisition |
|---|---|
Use Scenario: Real-time measurement of two motor phase currents using shunt resistors in a three-phase inverter. IC Role / Device Role / Timing Role: Dual ADC simultaneously samples IA and IB at 1 MSPS with matched aperture delay (<200 ps), feeding FPGA or DSP for FOC algorithm execution. Use Value: Eliminates time-skew-induced torque ripple; 70 dB SNR preserves resolution down to 12-bit effective number of bits (ENOB) at 300 kHz bandwidth. |
Use Scenario: Multi-sensor monitoring in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Replaces two discrete 12-bit ADCs with one AD7866BRUZ-REEL, reducing PCB area and BOM count while supporting 4-channel scan via A0 multiplexer control. Use Value: 20-lead TSSOP saves >30% board space vs. dual SOIC-16 solution; –40°C to +125°C rating ensures reliability in uncooled control cabinets. |
| Power Quality Analyzer | Isolated Sensor Interface |
Use Scenario: Simultaneous voltage and current sampling for harmonic analysis per IEC 61000-4-30 Class I. IC Role / Device Role / Timing Role: ADC A acquires line voltage (0–1000 V via divider), ADC B acquires current (0–50 A via CT), both referenced to same 2.5 V internal reference. Use Value: Channel-to-channel isolation >88 dB prevents cross-coupling artifacts in FFT-based THD/SFDR calculations; 1 MSPS throughput captures up to 499 kHz harmonics. |
Use Scenario: High-voltage isolated current sensing using optocoupler or digital isolator between microcontroller and ADC. IC Role / Device Role / Timing Role: AD7866BRUZ-REEL resides on isolated side with local 3.3 V supply; serial interface crosses isolation barrier via SPI isolator (e.g., ADuM3401). Use Value: VDRIVE pin allows independent logic-level setting (2.7–5.25 V), matching isolator I/O voltage without level shifters; 1 µA shutdown current minimizes isolated-side quiescent load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865-1ARSZ | Single 12-bit, 1 MSPS ADC with 4-channel mux; no simultaneous sampling; requires external reference; 24-lead SSOP. | Lacks dual independent ADC cores - cannot capture time-aligned channel pairs; lower channel density per package. | Choose only if sequential multi-channel scanning suffices and board space permits larger SSOP package. |
| ADS8325IPW | Single 16-bit, 100 kSPS SAR ADC; no internal reference; SPI-only interface; 16-lead TSSOP. | Higher resolution but 10× slower throughput; no simultaneous dual-channel capability; requires external 2.5 V reference and decoupling. | Select when absolute precision > speed (e.g., static sensor calibration), not for dynamic waveform capture. |
Compared with AD7866BRUZ-REEL, AD7865-1ARSZ trades simultaneous dual-channel operation for higher input channel count but adds mux-induced delay and timing uncertainty, while ADS8325IPW sacrifices throughput and integration to achieve 16-bit resolution - neither matches the AD7866BRUZ-REEL's balance of speed, dual-core determinism, and reference integration for real-time industrial control.
Availability
AD7866BRUZ-REEL is available at Aetrix Electronics and suitable for motor control feedback, industrial PLC analog input modules, power quality analyzers, and isolated sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7866BRUZ-REEL 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 AD7866BRUZ-REEL belongs to Analog Devices' precision high-speed data acquisition product line, engineered specifically for deterministic, low-latency, dual-channel sampling in harsh industrial environments where temperature stability, power efficiency, and timing predictability are non-negotiable.
FAQ
What is the guaranteed operating temperature range for AD7866BRUZ-REEL?
The AD7866BRUZ-REEL is specified for continuous operation from –40°C to +125°C across all electrical parameters. This B-grade qualification is verified per the AD7866 datasheet Rev. A, including DC accuracy (INL ±1 LSB), dynamic performance (SNR ≥68 dB), and power consumption (IDD ≤3.8 mA at 3 V) across the full range - making it suitable for under-hood automotive sensors or uncooled factory-floor controllers.
Does AD7866BRUZ-REEL support true simultaneous sampling of both channels?
Yes, AD7866BRUZ-REEL features two independent track-and-hold amplifiers and SAR cores that sample VA1/VA2 and VB1/VB2 on the same falling edge of CS. Aperture delay matching is guaranteed ≤200 ps, ensuring sub-LSB timing alignment - critical for accurate phase difference calculation in motor control or power metering applications where channel skew would introduce systematic error.
Can AD7866BRUZ-REEL use an external reference while retaining the internal 2.5 V reference for system-level distribution?
No - when REF SELECT is high (external reference mode), the internal 2.5 V reference is disabled. However, AD7866BRUZ-REEL supports a hybrid configuration: tie REF SELECT low and VREF to AGND, then apply independent external references to DCAPA and DCAPB. In this mode, the internal reference is inactive, but each ADC uses its dedicated external reference - enabling ratiometric measurements with different sensor excitation sources.
What is the minimum SCLK frequency required for reliable operation of AD7866BRUZ-REEL?
The AD7866BRUZ-REEL requires a minimum SCLK frequency of 2 kHz for valid serial communication and conversion control, as specified in the Timing Specifications table (Rev. A, p.4). At this rate, conversion time extends to 8 ms (16 × 500 µs), but all timing margins (tQUIET, t2–t9) remain met - enabling ultra-low-power sleep-wake cycles in battery-powered condition monitoring nodes.
How does the RANGE pin affect output coding and input range in AD7866BRUZ-REEL?
The RANGE pin is sampled on the falling edge of CS to set both analog input range and output coding for the upcoming conversion: low → 0 V to VREF input range with straight binary coding; high → –VREF to +VREF input range with twos complement coding. If RANGE changes after CS fall but before the 8th SCLK edge, only the output coding toggles - the input range remains fixed - allowing dynamic format switching without interrupting acquisition.
AD7866BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- 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:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7866BRUZ-REEL FAQ
1.How can I place an order for AD7866BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7866BRUZ-REEL 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 AD7866BRUZ-REEL reliable?
The price and inventory of AD7866BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7866BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7866BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7866BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7866BRUZ-REEL?
AD7866BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7866BRUZ-REEL 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 AD7866BRUZ-REEL?
For technical support, including AD7866BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7866BRUZ-REEL requirements.
6.How does Aetrix verify that AD7866BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7866BRUZ-REEL 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 AD7866BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7866BRUZ-REEL?
All AD7866BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7866BRUZ-REEL, 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 AD7866BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7866BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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