My Inquiry
My Account
Analog Devices Inc. AD7866BRU
- Part No.:
- AD7866BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7866BRU.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7866BRU from Analog Devices is a dual-channel, 12-bit, 1 MSPS successive approximation ADC with integrated 2.5 V reference, 20-lead TSSOP package, and simultaneous conversion capability for high-speed data acquisition in industrial control and motor feedback systems.
For engineers reviewing the AD7866BRU datasheet, AD7866BRU pinout, AD7866BRU application, or AD7866BRU equivalent, key selection criteria include its dual independent 12-bit SAR architecture, simultaneous sampling of two analog inputs (VA1/VA2 and VB1/VB2), flexible 0–VREF or 0–2VREF input ranges, and SPI/QSPI/MICROWIRE-compatible serial interface with separate DOUTA/DOUTB outputs.
Technical Context
The AD7866BRU implements two fully independent 12-bit SAR ADCs, each with dedicated track-and-hold amplifiers supporting >10 MHz input bandwidth and 70 dB SNR at 300 kHz. Conversion is initiated on the falling edge of CS, with timing fully controlled by SCLK (up to 20 MHz), eliminating pipeline latency.
It supports three reference configurations: internal 2.5 V reference (via REF SELECT = low), external single reference (via VREF pin), or dual independent external references (via DCAPA/DCAPB pins). Input range and output coding (straight binary or twos complement) are selected dynamically via the RANGE pin sampled at CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees 1 LSB = 0.024% full-scale quantization step for precision measurement |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to 500 kHz per Nyquist criterion |
| SNR @ 300 kHz | 70 dB - ensures >11.6 effective number of bits (ENOB) for clean signal digitization |
| Channel Isolation | –88 dB - prevents crosstalk between VA and VB channels during simultaneous acquisition |
| Power @ 3 V / 1 MSPS | 11.4 mW - allows battery-powered or thermally constrained embedded designs |
| Reference Voltage | 2.5 V ±1% - stable on-chip reference eliminates need for external precision reference in many applications |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and harsh-environment sensing |
Pinout & Package
AD7866BRU is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal management.
| 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 |
| 2,9 (DCAPB, DCAPA) | Reference buffer decoupling & external ref input | Accept individual external references for ADC B and ADC A respectively when REF SELECT = high and VREF = AGND |
| 4,5 (VB2, VB1) | Analog inputs - Channel 2 & 1 of ADC B | Single-ended inputs supporting 0–VREF or 0–2VREF ranges; require proper AGND referencing |
| 6,7 (VA2, VA1) | Analog inputs - Channel 2 & 1 of ADC A | Independent from VB inputs; enable true dual-simultaneous acquisition without multiplexer delay |
| 11 (RANGE) | Input range & output coding select | Samples at CS fall: low → 0–VREF + straight binary; high → 0–2VREF + twos complement |
| 15,16 (DOUTB, DOUTA) | Serial data outputs | Simultaneously output 16-bit frames (1 zero + 3 status + 12 data bits, MSB first) - enables parallel read or time-multiplexed read on one port |
| 19 (CS) | Chip select / conversion trigger | Active-low signal that initiates sampling on falling edge and frames serial data transfer |
| 20 (A0) | Multiplexer channel select | Selects VA1/VB1 (A0 = low) or VA2/VB2 (A0 = high) for next simultaneous conversion pair |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel conversion | Enables phase-coherent sampling of two signals (e.g., current + voltage) without inter-channel skew or timing mismatch |
| No pipeline delay | Guarantees deterministic latency: conversion completes in exactly 16 SCLK cycles after CS fall - critical for closed-loop control |
| 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 | ±1% initial accuracy and 50 ppm/°C tempco - sufficient for <12-bit system accuracy without external reference cost/area |
| High channel isolation | –88 dB crosstalk suppression - preserves signal integrity when measuring differential or complementary signals (e.g., motor phase currents) |
Applications
| Motor Phase Current Sensing | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Real-time measurement of two motor phase currents (e.g., Ia and Ib) in servo drive feedback loops. IC Role / Device Role / Timing Role: Dual simultaneous sampling ADC providing phase-aligned digital samples to FPGA or DSP for vector control computation. Use Value: Eliminates time-skew error between current measurements, enabling accurate torque estimation and reducing current ripple in field-oriented control. |
Use Scenario: High-density analog input card in programmable logic controller handling multiple 4–20 mA or ±10 V sensor inputs. IC Role / Device Role / Timing Role: Dual ADC front-end converting two sensor channels per device, reducing component count vs. single-channel alternatives. Use Value: Doubles channel density per IC while maintaining 1 MSPS throughput - cuts board area and BOM cost in multi-channel I/O modules. |
| Automotive Battery Cell Monitoring | Power Quality Analyzer Front-End |
Use Scenario: Simultaneous voltage and temperature sampling across adjacent lithium-ion battery cells in EV battery management systems. IC Role / Device Role / Timing Role: Dual 12-bit ADC acquiring cell voltage (VA1) and thermistor voltage (VB1) with matched acquisition timing. Use Value: Enables precise ΔV/ΔT correlation for state-of-charge and thermal runaway prediction without inter-sample timing drift. |
Use Scenario: Capturing voltage and current waveforms in real-time power analyzers for harmonic distortion analysis (THD, SFDR). IC Role / Device Role / Timing Role: Dual high-SNR ADC capturing synchronized voltage (VA) and current (VB) samples at 1 MSPS for FFT-based spectral analysis. Use Value: 70 dB SNR and –76 dB SFDR support accurate 9–10 bit ENOB performance required for Class A power quality standards (IEC 61000-4-30). |
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 14-bit, 1 MSPS ADC with 4:1 MUX; no simultaneous dual conversion; requires external reference | Lower resolution but higher precision per channel; suited for sequential multi-channel scanning, not phase-coherent dual acquisition | Choose when absolute precision on one channel outweighs need for simultaneity; not suitable for motor current pairs |
| ADS8327IPW | Dual 16-bit, 500 kSPS SAR ADC; SPI-only interface; no internal reference; 24-TSSOP package | Higher resolution but half the throughput; lacks simultaneous sampling control (separate CS per channel) | Prefer for high-accuracy static measurements (e.g., weigh scales); avoid where 1 MSPS dual-channel timing coherence is mandatory |
Compared with AD7865-1ARSZ and ADS8327IPW, the AD7866BRU uniquely delivers true simultaneous 12-bit dual-channel conversion at 1 MSPS with integrated reference and flexible input range selection - making it the only option among the three for phase-aligned, high-throughput industrial feedback systems.
Availability
AD7866BRU is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and power quality monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7866BRU 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 AD7866BRU belongs to Analog Devices' precision data acquisition portfolio, designed specifically for high-speed, low-power, dual-channel sampling in space-constrained and thermally demanding environments like motor drives and energy metering.
FAQ
What is the guaranteed operating temperature range for the AD7866BRU?
The AD7866BRU is specified for continuous operation from –40°C to +125°C across all electrical parameters. This rating is confirmed in the Ordering Guide and Absolute Maximum Ratings sections of the official datasheet, and applies to both A and B grade versions including AD7866BRU. The device maintains full 12-bit linearity and 1 MSPS throughput across this full industrial temperature range.
Does the AD7866BRU support simultaneous sampling of two independent analog signals?
Yes, the AD7866BRU features two completely independent SAR ADC cores with dedicated track-and-hold amplifiers, enabling true simultaneous sampling and conversion of VA1/VA2 and VB1/VB2. The conversion results appear simultaneously on DOUTA and DOUTB, with identical aperture delay matching (≤200 ps), ensuring phase coherence critical for current/voltage or differential measurements.
Can the AD7866BRU operate with an external reference instead of the internal 2.5 V reference?
Yes, the AD7866BRU supports three reference modes. When REF SELECT is high, an external reference can be applied to the VREF pin. Alternatively, with REF SELECT low and VREF tied to AGND, separate external references may be supplied directly to DCAPA and DCAPB for independent ADC A and ADC B scaling - a capability unique to the AD7866BRU within its product family.
What serial interface protocols is the AD7866BRU compatible with?
The AD7866BRU supports SPI, QSPI, MICROWIRE, and generic DSP serial interfaces. Its DOUTA/DOUTB outputs are driven on the falling edge of SCLK, and the part accepts standard CS/SCLK timing. No configuration register writes are needed - interface behavior is determined solely by pin states (REF SELECT, RANGE, A0) and SCLK frequency, simplifying firmware integration.
How does power consumption scale with throughput rate in the AD7866BRU?
AD7866BRU power scales linearly with SCLK frequency due to its synchronous SAR architecture. At 3 V, it consumes 3.8 mA (11.4 mW) at 1 MSPS (20 MHz SCLK), 1.6 mA in partial power-down at 100 kSPS, and just 1 µA in full shutdown. This enables dynamic power management in battery-operated or thermally sensitive applications without sacrificing conversion accuracy.
AD7866BRU 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:
- -
AD7866BRU FAQ
1.How can I place an order for AD7866BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7866BRU 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 AD7866BRU reliable?
The price and inventory of AD7866BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7866BRU is usually 5 days.
3.What payment methods are accepted for AD7866BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7866BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7866BRU?
AD7866BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7866BRU 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 AD7866BRU?
For technical support, including AD7866BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7866BRU requirements.
6.How does Aetrix verify that AD7866BRU is sourced from the original manufacturer or authorized distributors?
All AD7866BRU 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 AD7866BRU meets industry standards.
7.What is the process for return or replacement of AD7866BRU?
All AD7866BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7866BRU, 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 AD7866BRU part is unused and in its original packaging.
Return procedure for AD7866BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7866BRU 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…
