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Analog Devices Inc. AD7866BRUZ
- Part No.:
- AD7866BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7866BRUZ.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:149
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Product details
Overview
AD7866BRUZ from Analog Devices is a dual 12-bit, 2-channel successive approximation register (SAR) ADC with simultaneous sampling, 1 MSPS throughput, 70 dB SNR at 300 kHz, on-chip 2.5 V reference, and operation from 2.7 V to 5.25 V supply. It serves as a high-precision analog front-end in industrial data acquisition systems requiring synchronized dual-channel measurement.
For engineers reviewing the AD7866BRUZ datasheet, AD7866BRUZ pinout, AD7866BRUZ application, or AD7866BRUZ equivalent, key selection criteria include simultaneous dual-channel conversion capability, flexible input range selection (0–VREF or ±VREF), SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and guaranteed no missing codes over temperature.
Technical Context
The AD7866BRUZ integrates two independent SAR ADCs, each with its own 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 timing fully controlled by SCLK - no pipeline delay, no latency beyond 16 SCLK cycles.
It supports dual reference configurations: internal 2.5 V reference (enabled via REF SELECT = low), external reference applied to VREF (REF SELECT = high), or separate external references per ADC via DCAPA/DCAPB. Input range (0–VREF or 2×VREF) and output coding (straight binary or twos complement) are selected dynamically via RANGE pin state sampled at CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% full-scale accuracy for precision sensor digitization |
| Throughput Rate | 1 MSPS - enables real-time capture of fast transients in motor control or power quality monitoring |
| SNR | 70 dB at 300 kHz - ensures clean spectral representation for FFT-based analysis in vibration sensing |
| Channel Isolation | –88 dB - prevents crosstalk between simultaneously sampled channels in differential signal conditioning |
| Power Dissipation | 11.4 mW max at 3 V / 1 MSPS - supports thermally constrained embedded designs without active cooling |
| Aperture Jitter | 50 ps typ - limits sampling uncertainty to <0.1 LSB at 100 kHz input, critical for high-fidelity waveform capture |
| Integral Nonlinearity | ±1 LSB max (B grade, 0–VREF range) - guarantees monotonicity and end-point accuracy for calibration-critical applications |
Pinout & Package
AD7866BRUZ 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 θJA = 143°C/W enables operation up to +125°C ambient when properly mounted on ≥2 cm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, REF SELECT | Reference mode control | Selects internal 2.5 V reference (low) or external reference (high); determines decoupling topology for VREF/DCAPA/DCAPB |
| 6,7 VA1,VA2 / 4,5 VB1,VB2 | Analog inputs (ADC A/B) | Four single-ended channels; A0 pin selects which pair (1 or 2) converts simultaneously on next CS edge |
| 11, RANGE | Input range & coding select | Sampled at CS fall: low → 0–VREF + straight binary; high → ±VREF + twos complement |
| 15,16 DOUTA,DOUTB | Serial data outputs | Simultaneous 16-bit frames (1 zero + 3 status + 12 data bits, MSB first); support independent or time-multiplexed readout |
| 19, CS | Chip select | Active-low signal initiating conversion and framing serial transfer; sampling occurs on its falling edge |
| 18, SCLK | Serial clock | Drives both data transfer and internal conversion timing; 2–20 MHz range sets throughput and power trade-off |
| 2,9 DCAPB,DCAPA | Reference decoupling / external ref input | Accept individual external references per ADC when REF SELECT = low and VREF = AGND; require 10 µF + 0.1 µF decoupling |
| 10, VREF | Reference voltage node | Internal 2.5 V reference output (when REF SELECT = low); external reference input (when REF SELECT = high) |
| 12 AVDD / 13 DVDD / 17 VDRIVE | Supply rails | AVDD (2.7–5.25 V) powers analog circuitry; DVDD (2.7–5.25 V) powers digital logic; VDRIVE sets I/O voltage level (2.7–5.25 V) |
| 3,8 AGND / 14 DGND | Analog & digital ground | Must be tied at single point; voltage difference ≤0.3 V transiently to prevent ground bounce-induced INL error |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Enables true time-aligned capture of phase-sensitive signals (e.g., current/voltage in power metering) without inter-channel skew |
| No pipeline delay | Guarantees deterministic 16-SCLK conversion latency - essential for closed-loop control timing budgets |
| Flexible power/throughput scaling | Power scales linearly with SCLK frequency; partial power-down mode reduces IDD to 560 µA at 100 kSPS |
| On-chip 2.5 V reference with ±15 mV error over –40°C to +125°C | Eliminates external reference IC in cost-sensitive industrial sensors while maintaining system-level accuracy |
| Channel-to-channel isolation >88 dB | Prevents signal leakage between ADC A and B inputs - critical for isolated current sensing with shared shunt resistor |
Applications
| Industrial Motor Control | Energy Metering |
|---|---|
Use Scenario: Real-time sampling of phase current and bus voltage in three-phase inverters for field-oriented control. IC Role / Device Role / Timing Role: Dual ADC simultaneously captures current (VA1/VB1) and voltage (VA2/VB2) with sub-100 ps aperture matching to preserve vector angle integrity. Use Value: Enables accurate torque estimation and PWM synchronization without external sample-hold circuits or timing compensation firmware. |
Use Scenario: Simultaneous measurement of voltage and current waveforms in Class 0.2 electricity meters for harmonic analysis and billing accuracy. IC Role / Device Role / Timing Role: ADC A digitizes voltage channel (0–VREF), ADC B digitizes current channel (±VREF), both referenced to same 2.5 V internal source. Use Value: Eliminates gain/offset mismatch between channels, reducing calibration effort and improving THD-dependent meter certification pass rate. |
| Vibration Monitoring Sensor Node | Medical Ultrasound Beamforming |
Use Scenario: Battery-powered wireless sensor collecting triaxial accelerometer data for predictive maintenance in rotating machinery. IC Role / Device Role / Timing Role: Dual ADC samples X/Y axes simultaneously at 1 MSPS; low 11.4 mW power at 3 V extends battery life in sealed enclosures. Use Value: Achieves 70 dB SNR at 300 kHz input - sufficient for detecting early bearing faults via envelope spectrum analysis. |
Use Scenario: Compact ultrasound probe requiring low-latency, matched-channel digitization of echo return signals from multiple transducer elements. IC Role / Device Role / Timing Role: Two AD7866BRUZ devices (one per probe half) provide four synchronized channels with <200 ps aperture delay matching across all inputs. Use Value: Maintains beam coherence during dynamic focusing, directly improving image resolution and contrast without post-processing correction. |
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 ADC, 1 MSPS, 20-lead SSOP; lacks simultaneous dual-channel architecture and on-chip reference | Requires external reference and external multiplexer for dual-channel use; adds latency and channel skew | Choose only if single-channel sampling suffices and board space allows discrete reference/mux implementation |
| ADS8325IPW | Single 16-bit, 100 kSPS SAR ADC, 20-lead TSSOP; higher resolution but lower speed and no dual-channel capability | Cannot perform simultaneous sampling; unsuitable for phase-critical measurements requiring time-aligned capture | Select when absolute precision > speed (e.g., DC sensor calibration), not for dynamic waveform capture |
Compared with AD7865-1ARSZ and ADS8325IPW, the AD7866BRUZ uniquely delivers true simultaneous dual-channel 12-bit conversion at 1 MSPS with integrated reference - eliminating external components and timing alignment complexity required by alternatives.
Availability
AD7866BRUZ is available at Aetrix Electronics and suitable for industrial motor control, energy metering, predictive maintenance sensors, and medical ultrasound subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7866BRUZ 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 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 AD7866BRUZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for industrial and instrumentation applications demanding simultaneous multi-channel sampling, wide temperature operation (–40°C to +125°C), and minimal external component count.
FAQ
What is the maximum sampling rate supported by the AD7866BRUZ?
The AD7866BRUZ 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 completes deterministically within that window. 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 AD7866BRUZ support simultaneous sampling of two independent analog signals?
Yes, the AD7866BRUZ features two fully independent SAR ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling of two analog inputs (e.g., VA1/VA2 and VB1/VB2). Aperture delay matching is specified at 200 ps max, ensuring time-aligned digitization critical for phase-sensitive applications like power metering and motor control - a capability confirmed in the AD7866BRUZ functional block diagram and timing specifications.
Can the AD7866BRUZ operate with an external reference instead of the internal 2.5 V reference?
Yes, the AD7866BRUZ supports three reference configurations: (1) internal 2.5 V reference (REF SELECT = low), (2) single external reference applied to VREF (REF SELECT = high), or (3) separate external references per ADC applied to DCAPA and DCAPB (REF SELECT = low + VREF = AGND). The reference input range is 2/3 V min to VDD max, and DCAPA/DCAPB pins accept references up to AVDD + 0.3 V, as specified in the Absolute Maximum Ratings and Pin Function Descriptions.
What are the power consumption characteristics of the AD7866BRUZ at 3 V supply?
At 3 V supply and 1 MSPS throughput, the AD7866BRUZ consumes a maximum of 3.8 mA (11.4 mW), including internal reference operation. In partial power-down mode at 100 kSPS, it draws 560 µA (1.68 mW static). Full power-down reduces current to 1 µA (3 µW) - values verified in the REV. A datasheet's Power Requirements table and confirmed across the –40°C to +125°C temperature range.
Is the AD7866BRUZ pin-compatible with other members of the AD786x family?
No, the AD7866BRUZ is not pin-compatible with AD7865 or AD7862 variants. While all share the 20-lead TSSOP package, pin functions differ significantly - for example, AD7865 lacks DOUTB, DCAPA, and DCAPB pins, and uses different control logic for channel selection. The AD7866BRUZ pinout is unique to its dual-ADC, dual-output architecture, as shown in the official Pin Configuration diagram on page 6 of the datasheet.
AD7866BRUZ 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:
- -
AD7866BRUZ FAQ
1.How can I place an order for AD7866BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7866BRUZ 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 reliable?
The price and inventory of AD7866BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7866BRUZ is usually 5 days.
3.What payment methods are accepted for AD7866BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7866BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7866BRUZ?
AD7866BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7866BRUZ 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?
For technical support, including AD7866BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7866BRUZ requirements.
6.How does Aetrix verify that AD7866BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7866BRUZ 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 meets industry standards.
7.What is the process for return or replacement of AD7866BRUZ?
All AD7866BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7866BRUZ, 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 part is unused and in its original packaging.
Return procedure for AD7866BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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