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Analog Devices Inc. AD7866ARU
- Part No.:
- AD7866ARU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7866ARU.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
AD7866ARU from Analog Devices is a dual 12-bit, 2-channel successive approximation ADC with simultaneous sampling, 1 MSPS throughput, on-chip 2.5 V reference, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface. It operates from a single 2.7 V to 5.25 V supply and delivers 70 dB SNR at 300 kHz input frequency for high-fidelity data acquisition in industrial sensor interfaces.
For engineers reviewing the AD7866ARU datasheet, AD7866ARU pinout, AD7866ARU application, or AD7866ARU equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the AD7866ARU TSSOP-20 variant.
Technical Context
The AD7866ARU integrates two independent SAR ADCs, each with a dedicated track-and-hold amplifier supporting >10 MHz input bandwidth and 12 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, with timing fully governed by SCLK (2–20 MHz), eliminating pipeline delay and enabling deterministic latency of exactly 16 SCLK cycles.
It supports flexible analog input configuration: 0 V to VREF or 0 V to 2×VREF ranges selected dynamically via the RANGE pin at CS fall, with straight binary or twos complement output coding. Reference sourcing is configurable-internal 2.5 V reference (enabled via REF SELECT low), external reference on VREF, or separate external references on DCAPA/DCAPB-each with specified 25 Ω output impedance and 50 ppm/°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees 1 part-in-4096 quantization granularity for precision measurement systems. |
| Throughput Rate | 1 MSPS - enables real-time capture of signals up to 500 kHz Nyquist bandwidth per channel. |
| SNR | 70 dB at 300 kHz - ensures <0.1% RMS noise contribution relative to full-scale sine wave, critical for vibration or audio monitoring. |
| Channel Isolation | –88 dB - prevents crosstalk between simultaneously sampled VA1/VA2 and VB1/VB2 inputs in multi-sensor systems. |
| Power Dissipation | 11.4 mW max at 3 V / 1 MSPS - allows battery-powered operation with <3.8 mA total current draw. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.03 LSB error at 100 kHz input, preserving dynamic range. |
| Integral Nonlinearity | ±1.5 LSB max (A grade) - defines end-to-end transfer function deviation, directly impacting absolute accuracy in calibration-critical applications. |
Pinout & Package
AD7866ARU is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad not connected internally. Thermal resistance is θJA = 143°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF SELECT) | Reference mode control input | Logic level selects internal 2.5 V reference (low) or external reference source (high); determines decoupling topology for VREF/DCAPA/DCAPB. |
| 6,7 (VA1, VA2) | Analog inputs for ADC A | Single-ended channels accepting 0–VREF or –VREF to +VREF ranges; require ≤30 pF source impedance for full 12-bit accuracy. |
| 4,5 (VB1, VB2) | Analog inputs for ADC B | Independent single-ended inputs with identical range and timing behavior as VA1/VA2; channel-to-channel isolation ≥88 dB. |
| 11 (RANGE) | Input range/output coding select | Configures analog input span (0–VREF or 0–2×VREF) and output format (straight binary or twos complement) on CS falling edge. |
| 15,16 (DOUTA, DOUTB) | Serial data outputs | Simultaneous MSB-first 12-bit conversion results with leading zero and status bits; support independent or multiplexed readout over one port. |
| 19 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data transfer; defines conversion start instant with aperture jitter ≤50 ps. |
| 18 (SCLK) | Serial clock / conversion clock | Drives both data transfer and internal SAR logic; conversion time fixed at 16 cycles (e.g., 800 ns @ 20 MHz), enabling precise throughput control. |
| 20 (A0) | Multiplexer channel select | Selects simultaneous conversion pair: low → VA1/VB1; high → VA2/VB2; sampled synchronously on CS falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Enables phase-coherent acquisition across two sensors without inter-channel skew, essential for motor current/voltage monitoring. |
| No pipeline delay | Guarantees deterministic 16-SCLK conversion latency and immediate data availability-no FIFO buffering or latency variation. |
| Flexible power/throughput scaling | Power scales linearly with SCLK frequency; reducing SCLK from 20 MHz to 2 MHz cuts dynamic current from 3.8 mA to ~0.5 mA at 3 V. |
| On-chip 2.5 V reference with 50 ppm/°C drift | Eliminates need for external reference IC in cost-sensitive designs while maintaining ±15 mV total error over –40°C to +125°C. |
| Full industrial temperature range | Specified from –40°C to +125°C with guaranteed INL, THD, and SNR performance-suitable for under-hood automotive or factory-floor use. |
Applications
| Motor Phase Current Monitoring | Industrial Vibration Sensor Interface |
|---|---|
|
Use Scenario: Simultaneous sampling of high-side and low-side shunt voltages in 3-phase inverter legs to compute instantaneous phase currents. IC Role / Device Role / Timing Role: Dual ADC performs synchronized acquisition of VA1/VB1 (e.g., U-phase high/low) with <200 ps aperture matching, feeding real-time FOC algorithms. Use Value: Eliminates time-skew-induced torque ripple; 70 dB SNR preserves resolution for detecting <1% load changes in predictive maintenance systems. |
Use Scenario: Condition monitoring of rotating machinery using piezoelectric accelerometers with wide dynamic range requirements. IC Role / Device Role / Timing Role: Converts differential accelerometer outputs (conditioned to single-ended) on VA2/VB2 with simultaneous 1 MSPS capture and 12 MHz bandwidth. Use Value: 12-bit resolution + 70 dB SNR enables detection of sub-millig acceleration events; –88 dB channel isolation prevents cross-talk between orthogonal axes. |
| Multi-Channel Data Logger | High-Speed Power Quality Analyzer |
|
Use Scenario: Compact battery-powered logger capturing voltage, current, and temperature across distributed nodes in smart grid infrastructure. IC Role / Device Role / Timing Role: Provides two independent 12-bit channels per device, reducing component count vs. single-channel alternatives; uses internal reference to minimize BOM. Use Value: 11.4 mW at 3 V extends battery life; shutdown mode draws only 1 µA, enabling years of standby operation with periodic wake-up sampling. |
Use Scenario: Real-time harmonic analysis of AC mains (50/60 Hz ± interharmonics) requiring simultaneous voltage and current sampling at >1 kSPS. IC Role / Device Role / Timing Role: Samples line voltage (VA1) and CT-derived current (VB1) with matched gain/offset error (<±0.2 LSB) to ensure accurate power factor calculation. Use Value: Gain error match ±0.2 LSB and offset error match ±1.2 LSB minimize computation errors in RMS, THD, and reactive power algorithms. |
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, 4-channel ADC (not dual simultaneous); 1 MSPS aggregate rate; no on-chip reference; requires external 2.5 V ref. | Lacks true simultaneous sampling; suitable only where channel skew <100 ns is acceptable and external reference is available. | Choose when system needs >2 channels but can tolerate sequential acquisition and has space for external reference circuitry. |
| ADS8325IPW | Single 16-bit, 1-MSPS SAR ADC; no dual-channel capability; higher resolution but no simultaneous dual conversion; SPI-only interface. | Provides superior DC accuracy (±1 LSB INL) but cannot replace AD7866ARU's phase-coherent dual acquisition role. | Choose only if resolution >12 bits is mandatory and dual-channel simultaneity is unnecessary-requires redesign for single-channel architecture. |
Compared with AD7866ARU, AD7865-1ARSZ trades simultaneity for channel count and AD7866ARU's integrated reference, while ADS8325IPW sacrifices dual-channel functionality for higher resolution-neither offers drop-in replacement capability due to fundamental architectural differences in sampling architecture and pinout.
Availability
AD7866ARU is available at Aetrix Electronics and suitable for industrial motor control, predictive maintenance sensor hubs, portable power quality analyzers, and high-reliability data loggers requiring stable component supply across extended temperature ranges.
Supply support for AD7866ARU 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 AD7866ARU belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding simultaneous multi-channel acquisition, low power, and guaranteed performance from –40°C to +125°C without calibration.
FAQ
What is the maximum sampling rate supported by the AD7866ARU?
The AD7866ARU supports a maximum throughput rate of 1 MSPS per channel, achieved with a 20 MHz SCLK. Conversion time is fixed at 16 SCLK cycles (800 ns at 20 MHz), and the part guarantees full 12-bit performance-including SNR, THD, and INL-at this rate across its full –40°C to +125°C operating range. The AD7866ARU does not support oversampling or decimation modes.
Does the AD7866ARU require an external reference voltage?
No-the AD7866ARU includes an on-chip 2.5 V reference with ±1% initial accuracy and 50 ppm/°C temperature coefficient, sufficient for most industrial applications. When REF SELECT is tied low, the internal reference powers both ADCs via DCAPA/DCAPB decoupling caps. External references may be applied on VREF, DCAPA, or DCAPB if higher precision or custom voltage levels are needed-but the AD7866ARU itself does not require them.
How does the AD7866ARU handle simultaneous conversion of two channels?
The AD7866ARU contains two fully independent SAR ADCs, each with its own track-and-hold amplifier. Sampling is triggered synchronously on the falling edge of CS, and both conversions complete in parallel within 16 SCLK cycles. Results appear simultaneously on DOUTA and DOUTB as MSB-first 12-bit words, with aperture delay matching ≤200 ps-enabling true phase-coherent acquisition required in motor control and power measurement.
What package type is used for the AD7866ARU?
The AD7866ARU is supplied in a 20-lead Thin Shrink Small Outline Package (TSSOP), designated RU-20 in Analog Devices' ordering nomenclature. It features a 0.65 mm lead pitch, conforms to JEDEC MO-153 standards, and includes an exposed pad that is not internally connected. The package is rated for operation from –40°C to +125°C and has θJA = 143°C/W.
Can the AD7866ARU operate from a 3.3 V supply?
Yes-the AD7866ARU is fully specified for operation from 2.7 V to 5.25 V on both AVDD and DVDD. At 3.3 V, it delivers 11.4 mW maximum power dissipation at 1 MSPS, drawing ≤3.8 mA total supply current. All AC and DC specifications-including 70 dB SNR, ±1.5 LSB INL, and –88 dB channel isolation-are guaranteed across the entire voltage range, including 3.3 V nominal systems.
AD7866ARU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7866ARU FAQ
1.How can I place an order for AD7866ARU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7866ARU 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 AD7866ARU reliable?
The price and inventory of AD7866ARU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7866ARU is usually 5 days.
3.What payment methods are accepted for AD7866ARU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7866ARU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7866ARU?
AD7866ARU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7866ARU 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 AD7866ARU?
For technical support, including AD7866ARU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7866ARU requirements.
6.How does Aetrix verify that AD7866ARU is sourced from the original manufacturer or authorized distributors?
All AD7866ARU 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 AD7866ARU meets industry standards.
7.What is the process for return or replacement of AD7866ARU?
All AD7866ARU units undergo pre-shipment inspection (PSI). If there is an issue with AD7866ARU, 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 AD7866ARU part is unused and in its original packaging.
Return procedure for AD7866ARU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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