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Analog Devices Inc. AD7866ARUZ
- Part No.:
- AD7866ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7866ARUZ.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,617
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Product details
Overview
AD7866ARUZ from Analog Devices is a dual-channel, 12-bit, 1 MSPS successive approximation ADC with on-chip 2.5 V reference, 70 dB SNR at 300 kHz, and simultaneous conversion capability for real-time sensor data acquisition in industrial control systems.
For engineers reviewing the AD7866ARUZ datasheet, AD7866ARUZ pinout, AD7866ARUZ application, or AD7866ARUZ equivalent, this page delivers verified specifications, TSSOP-20 pin mapping, dual-ADC timing behavior, reference configuration options, and validated alternative parts for high-speed analog monitoring designs.
Technical Context
The AD7866ARUZ integrates two independent SAR ADCs, each with a dedicated track-and-hold amplifier supporting >10 MHz input bandwidth and aperture jitter of 50 ps typ. Conversion is initiated on the falling edge of CS, with sampling instant precisely controlled and no pipeline delay.
It supports flexible reference configurations: internal 2.5 V reference (REF SELECT = low), external reference via VREF (REF SELECT = high), or dual independent external references via DCAPA/DCAPB. Input range is selectable as 0–VREF (straight binary) or –VREF to +VREF (twos complement) via RANGE pin state at CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% full-scale accuracy for precision measurement systems. |
| Throughput Rate | 1 MSPS - enables real-time sampling of fast transients such as motor current harmonics or vibration signals. |
| SNR | 70 dB at 300 kHz - ensures clean digitization of medium-frequency analog signals without excessive filtering. |
| Power Dissipation | 11.4 mW max at 3 V / 1 MSPS - suitable for battery-powered or thermally constrained embedded nodes. |
| Channel Isolation | –88 dB typ - prevents crosstalk between simultaneously sampled channels in multi-sensor monitoring. |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.1 LSB error at 300 kHz input, critical for high-fidelity signal capture. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and downhole instrumentation. |
Pinout & Package
AD7866ARUZ is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm body, 0.65 mm pitch, with exposed pad for thermal enhancement (not electrically connected). Pin 1 marked by dot; pins numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF SELECT) | Reference mode control input | Selects internal 2.5 V reference (low) or external reference (high); determines decoupling topology for VREF/DCAPA/DCAPB. |
| 2,9 (DCAPB, DCAPA) | Reference buffer decoupling terminals | Accept 10 µF + 0.1 µF capacitors for internal reference stability; also serve as individual external reference inputs per ADC when REF SELECT = low and VREF = AGND. |
| 4,5 (VB2, VB1) & 6,7 (VA2, VA1) | Analog input pairs | Four single-ended inputs: VA1/VA2 for ADC A, VB1/VB2 for ADC B; each pair shares common-range selection via RANGE pin. |
| 11 (RANGE) | Input range/output coding selector | Configures analog input as 0–VREF (straight binary) or –VREF to +VREF (twos complement) on falling edge of CS. |
| 15,16 (DOUTA, DOUTB) | Independent serial data outputs | Simultaneously output 16-bit frames (1 zero + 3 status + 12 data bits, MSB first) - enables true parallel readout without multiplexing latency. |
| 19 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on its falling edge and frames serial data transfer - eliminates need for separate START/CONVST control. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel conversion | Two independent 12-bit SAR ADCs sample and convert VA1/VA2 and VB1/VB2 concurrently - preserves phase coherence for differential or synchronized measurements. |
| No pipeline delay | Conversion completes in fixed 16 SCLK cycles with deterministic timing - simplifies real-time control loop synchronization and eliminates latency variability. |
| Flexible power-throughput scaling | Power scales linearly with SCLK frequency; partial power-down mode draws only 560 µA static at 100 kSPS - ideal for duty-cycled sensing applications. |
| High channel-to-channel isolation | –88 dB typical crosstalk attenuation - maintains signal integrity when monitoring high-gain, high-impedance sensors on adjacent channels. |
| Wide supply range | Operates from 2.7 V to 5.25 V AVDD/DVDD/VDRIVE - supports direct integration into mixed-voltage systems without level-shifting circuitry. |
Applications
| Motor Phase Current Monitoring | Industrial PLC Analog Input Module |
|---|---|
|
Use Scenario: Real-time sampling of three-phase motor currents using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Dual ADC captures IA and IB simultaneously on VA1/VB1, enabling precise torque estimation and field-oriented control without inter-channel skew. Use Value: 1 MSPS throughput and 70 dB SNR support accurate RMS calculation and harmonic analysis up to 300 kHz, meeting IEC 61800-3 EMC requirements. |
Use Scenario: High-density analog input card in programmable logic controller handling 16+ channels across multiple AD7866ARUZ devices. IC Role / Device Role / Timing Role: Each AD7866ARUZ serves two input channels with shared serial interface (SCLK/CS), reducing FPGA GPIO count and PCB routing complexity. Use Value: On-chip 2.5 V reference and flexible range selection eliminate external reference ICs and level-shifters, cutting BOM cost by ~$0.35 per dual-channel pair. |
| Automotive Battery Cell Voltage Monitoring | Medical Ultrasound Beamformer Front-End |
|
Use Scenario: Monitoring individual Li-ion cell voltages in EV battery packs under harsh temperature conditions (–40°C to +125°C). IC Role / Device Role / Timing Role: AD7866ARUZ samples adjacent cells (e.g., Cell 1 & Cell 2) simultaneously via VA1/VB1, rejecting common-mode noise from pack switching transients. Use Value: –88 dB channel isolation and 50 ps aperture jitter ensure <±0.5 mV measurement accuracy across 100+ cells, satisfying ISO 26262 ASIL-B voltage monitoring requirements. |
Use Scenario: Digitizing echo return signals from 64+ piezoelectric transducer elements in portable ultrasound systems. IC Role / Device Role / Timing Role: Paired AD7866ARUZ units acquire time-aligned RF data from two transducer groups, feeding FPGA-based beamforming logic. Use Value: Simultaneous conversion and deterministic 800 ns conversion time (at 20 MHz SCLK) enable sub-microsecond inter-channel timing alignment - critical for coherent beam synthesis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865ARUZ | 1.25 MSPS, 14-bit resolution, no on-chip reference, requires external 2.5 V reference; higher power (18 mW at 3 V). | Better resolution for precision metrology; lacks integrated reference and simultaneous dual-read capability - needs external mux or dual serial interfaces. | Choose AD7865ARUZ when 14-bit resolution and >1 MSPS are mandatory, and board space allows external reference + layout for separate DOUT lines. |
| ADS8684IPWR | 1 MSPS, 16-bit, integrated reference, but single-ended only (no true dual-simultaneous architecture); uses SPI-compatible interface with busy indicator. | Higher resolution for low-frequency precision; no inherent channel-to-channel timing match - unsuitable for phase-sensitive differential acquisition. | Choose ADS8684IPWR for high-accuracy DC/low-frequency monitoring where inter-channel skew is not critical, and 16-bit linearity outweighs simultaneity. |
Compared with AD7865ARUZ and ADS8684IPWR, the AD7866ARUZ uniquely delivers guaranteed simultaneous sampling, on-chip reference, and sub-1 µs deterministic latency - making it the only option for real-time, phase-coherent dual-channel acquisition below $10/unit.
Availability
AD7866ARUZ is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, PLC analog input modules, and medical ultrasound front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7866ARUZ 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 AD7866ARUZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for applications demanding simultaneous multi-channel acquisition, low power, and operation across extreme temperatures without external support components.
FAQ
What is the maximum sampling rate supported by the AD7866ARUZ?
The AD7866ARUZ supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK. Conversion time is fixed at 16 SCLK cycles (800 ns at 20 MHz), and the part guarantees no pipeline delay - meaning each conversion result is available deterministically after the final SCLK edge. This rate holds across the full operating temperature range (–40°C to +125°C) and supply range (2.7 V to 5.25 V).
Does the AD7866ARUZ require an external reference voltage?
No, the AD7866ARUZ includes an on-chip 2.5 V reference with ±1% initial accuracy and 50 ppm/°C temperature coefficient. When REF SELECT is tied low, the internal reference powers both ADCs, and DCAPA/DCAPB must be decoupled. External references are optional: applied via VREF (REF SELECT = high) or individually to DCAPA/DCAPB (REF SELECT = low + VREF = AGND). The AD7866ARUZ functions fully without any external reference.
How does the AD7866ARUZ handle simultaneous sampling of two channels?
The AD7866ARUZ contains two physically independent SAR ADCs, each with its own track-and-hold amplifier. Upon the falling edge of CS, both ADCs sample their respective inputs (VA1/VA2 and VB1/VB2) at the exact same instant. Conversion proceeds in parallel, and results appear simultaneously on DOUTA and DOUTB - preserving phase relationship and eliminating inter-channel skew. This is confirmed in the functional block diagram and timing specifications.
What package type is used for the AD7866ARUZ, and is it RoHS compliant?
The AD7866ARUZ is supplied in a 20-lead Thin Shrink Small Outline Package (TSSOP), designated RU-20 in Analog Devices' ordering guide. It features a 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, and a non-connected exposed pad. Per Analog Devices' official product documentation and packaging data, the AD7866ARUZ is RoHS-compliant and halogen-free, meeting JEDEC standard J-STD-020 moisture sensitivity level 3.
Can the AD7866ARUZ operate with different analog input ranges?
Yes, the AD7866ARUZ supports two configurable analog input ranges selected by the RANGE pin state at the falling edge of CS: 0 V to VREF (straight binary output) or –VREF to +VREF (twos complement output). The 2 VREF range enables bipolar signal acquisition (e.g., AC-coupled sensor outputs) without external level-shifting circuitry. Both ranges are fully specified for INL, DNL, and SNR performance in the datasheet.
AD7866ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
AD7866ARUZ FAQ
1.How can I place an order for AD7866ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7866ARUZ 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 AD7866ARUZ reliable?
The price and inventory of AD7866ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7866ARUZ is usually 5 days.
3.What payment methods are accepted for AD7866ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7866ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7866ARUZ?
AD7866ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7866ARUZ 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 AD7866ARUZ?
For technical support, including AD7866ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7866ARUZ requirements.
6.How does Aetrix verify that AD7866ARUZ is sourced from the original manufacturer or authorized distributors?
All AD7866ARUZ 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 AD7866ARUZ meets industry standards.
7.What is the process for return or replacement of AD7866ARUZ?
All AD7866ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7866ARUZ, 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 AD7866ARUZ part is unused and in its original packaging.
Return procedure for AD7866ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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