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Analog Devices Inc. AD7706BRU-REEL
- Part No.:
- AD7706BRU-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7706BRU-REEL.pdf
- Description:
- IC ADC 16BIT 3CH 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
AD7706BRU-REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter with three pseudo-differential input channels, programmable gain (1–128), 0.003% integral nonlinearity, and 1 mW max power dissipation at 3 V. It integrates a buffered front end, on-chip digital filter with programmable notch, and SPI-/QSPI-/MICROWIRE-compatible 3-wire serial interface - enabling direct digitization of low-level transducer signals in battery-powered industrial sensor nodes.
For engineers reviewing the AD7706BRU-REEL datasheet, AD7706BRU-REEL pinout, AD7706BRU-REEL application, or AD7706BRU-REEL equivalent, key selection criteria include its 3-channel pseudo-differential architecture, ±2.5 V bipolar input range at 5 V supply, 8 μA standby current, 16-lead TSSOP package, and support for 50/60 Hz rejection via configurable digital filter notch.
Technical Context
The AD7706BRU-REEL employs a charge-balancing sigma-delta modulator followed by an on-chip sinc³ digital filter whose first notch frequency is software-programmable - allowing precise adjustment of output update rate (e.g., 50 Hz or 60 Hz rejection) and effective resolution trade-offs. Its programmable-gain amplifier (PGA) accepts unipolar (0–2.5 V) or bipolar (±2.5 V) inputs referenced to the COMMON pin, eliminating external signal conditioning for bridge sensors and RTDs.
It operates from a single 2.7–3.3 V or 4.75–5.25 V supply, features Schmitt-triggered SCLK for noise immunity, supports self- and system calibration to remove offset/gain errors, and includes a dedicated DRDY output for synchronous data capture - making it suitable for microcontroller-based measurement systems requiring high DC accuracy without external precision components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, no missing codes - guarantees monotonicity and full code coverage across full temperature range. |
| Integral Nonlinearity | ±0.003% of FSR - ensures <1 LSB error over full scale, critical for precision weight scales and process control. |
| Input Channels | 3 pseudo-differential - each channel shares COMMON reference, enabling simultaneous multi-sensor acquisition with common-mode rejection. |
| Programmable Gain | 1 to 128 - allows direct interface to mV-range outputs (e.g., load cells, thermocouples) without external amplification. |
| Power Dissipation | 1 mW max @ 3 V - enables continuous operation in energy-constrained IoT sensor nodes with >1-year battery life. |
| Standby Current | 8 μA max @ 3 V - supports ultra-low-power wake-on-event architectures with rapid return-to-measurement (<1 ms). |
| Digital Interface | 3-wire SPI/QSPI/MICROWIRE - reduces MCU GPIO count and isolation component count in industrial fieldbus modules. |
| 50/60 Hz Rejection | 98 dB typ - achieved via programmable digital filter notch, eliminating need for external line-frequency notch filters. |
Pinout & Package
AD7706BRU-REEL is housed in a 16-lead, low-profile, thin shrink small outline package (TSSOP) with 0.65 mm lead pitch, optimized for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; enables robust timing in noisy industrial environments with variable clock duty cycle (45–55%). |
| MCLK IN | Master clock input | Accepts crystal (500 kHz–5 MHz) or CMOS clock; determines conversion throughput and filter notch placement. |
| CS | Chip select | Active-low; enables 3-wire mode when hardwired low, reducing interconnect count in space-constrained designs. |
| DIN | Serial data input | Writes to on-chip registers (setup, clock, calibration); supports configuration and calibration without external logic. |
| DOUT | Serial data output | Reads conversion results or register contents; tri-state controlled by CS to allow bus sharing. |
| DRDY | Data ready output | Open-drain; signals valid conversion data and completion of on-chip calibration - synchronizes firmware reads. |
| AIN1 / AIN2 / AIN3 | Analog input channels | Pseudo-differential inputs referenced to COMMON; support ±10 mV to ±2.5 V ranges depending on gain and reference. |
| COMMON | Common-mode reference | Shared negative reference for all three channels; simplifies layout vs. fully differential topologies. |
| REF IN(+), REF IN(−) | Differential reference inputs | Accept 1.225 V (3 V supply) or 2.5 V (5 V supply); define full-scale range and enable ratiometric measurements. |
| RESET | Hardware reset | Active-low; resets digital filter, calibration coefficients, and interface logic - ensures deterministic startup state. |
| GND, VDD | Power supply terminals | Separate analog/digital ground not required; single-supply operation simplifies power design. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Eliminates zero-scale and full-scale errors without external equipment - reduces production test time and BOM cost. |
| Configurable digital filter notch | Enables precise 50 Hz or 60 Hz line-frequency rejection in software - avoids fixed-hardware filter limitations. |
| Bipolar/unipolar input mode | Software-selectable via B/U bit; supports both signed (e.g., thermocouple) and unsigned (e.g., pressure) sensor outputs. |
| Buffered analog input option | Enables high-impedance source interfacing (e.g., pH electrodes) with minimal gain error drift. |
| Low-power standby mode | Reduces current to 8 μA while preserving register state - ideal for wake-on-interrupt sensor polling. |
| CMOS process & ESD protection | Rated >4000 V HBM; withstands handling in factory and field environments without additional protection circuitry. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
Use Scenario: Digital pressure transmitter for HVAC and industrial process control using strain-gauge bridge sensors. IC Role / Device Role / Timing Role: ADC front end performing ratiometric digitization of mV-level bridge output with integrated PGA and reference. Use Value: Eliminates external instrumentation amplifier and precision voltage reference, reducing bill-of-materials by ≥3 components and PCB area by 35%. | Use Scenario: Multi-point RTD temperature monitoring in building automation panels. IC Role / Device Role / Timing Role: Simultaneous sampling of three 3-wire RTD channels with COMMON-referenced pseudo-differential inputs. Use Value: Enables single-chip acquisition of three independent temperature zones without multiplexer settling delay or crosstalk. |
| Battery Voltage Monitoring | Smart Transmitter Interface |
Use Scenario: Precision Li-ion battery pack voltage and current sensing in portable medical devices. IC Role / Device Role / Timing Role: High-accuracy DC measurement of cell voltages and shunt-based current with 16-bit resolution and low drift. Use Value: Achieves <0.1% SOC estimation error over temperature via on-chip calibration, extending usable battery life per charge. | Use Scenario: HART-enabled 4–20 mA smart transmitter with embedded diagnostics and local display. IC Role / Device Role / Timing Role: Sensor signal digitization and digital communication co-processor interfacing to microcontroller via 3-wire SPI. Use Value: Reduces isolation barrier complexity by consolidating analog acquisition and digital interface into one IC, cutting optocoupler count by 2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7705BRU-REEL | 2 fully differential input channels; identical architecture, gain range, and digital interface - but lacks third channel and COMMON pin. | Best suited for dual-sensor systems (e.g., dual-axis inclinometer); not drop-in for 3-channel designs due to pinout and channel topology mismatch. | Select when only two fully isolated differential inputs are required and board layout cannot accommodate COMMON-referenced topology. |
| ADS114S08IPWR | 12-channel, 16-bit delta-sigma ADC with integrated PGA, reference, and burn-out current sources; higher integration but larger 32-pin TQFP package. | Targets high-channel-count systems (e.g., data loggers); requires different layout, power sequencing, and firmware register map. | Choose for scalable multi-sensor platforms where future expansion beyond 3 channels is planned and PCB area permits larger footprint. |
Compared with AD7706BRU-REEL, AD7705BRU-REEL offers superior channel isolation at the cost of reduced channel count and no COMMON-based simplification, while ADS114S08IPWR trades pin efficiency and layout simplicity for higher channel density and integrated diagnostics - making AD7706BRU-REEL optimal for cost-sensitive, space-constrained 3-sensor industrial nodes.
Availability
AD7706BRU-REEL is available at Aetrix Electronics and suitable for pressure transmitters, battery management units, smart sensor modules, and industrial data acquisition systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7706BRU-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, 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 AD7705/AD7706 product line was engineered specifically for low-frequency, high-accuracy industrial measurement applications - delivering integrated signal conditioning, calibration, and digital filtering in a single IC to replace discrete front-end solutions.
FAQ
What is the maximum input voltage range supported by the AD7706BRU-REEL with a 5 V supply?
The AD7706BRU-REEL supports bipolar input ranges up to ±2.5 V and unipolar ranges up to 0–2.5 V when operating with a 5 V supply and 2.5 V reference. Absolute analog input voltage must remain within GND − 100 mV to VDD + 30 mV for specified performance. The COMMON pin serves as the reference point for all three pseudo-differential channels, enabling consistent common-mode rejection across inputs.
Does the AD7706BRU-REEL require an external crystal oscillator?
No, the AD7706BRU-REEL does not require an external crystal oscillator. It accepts either a crystal/resonator connected between MCLK IN and MCLK OUT, or an external CMOS-compatible clock applied to MCLK IN alone. The device operates across 500 kHz to 5 MHz; typical configurations use 2.4576 MHz for 50/60 Hz rejection. Internal oscillator circuitry eliminates need for external timing components unless highest stability is required.
How does the AD7706BRU-REEL handle 50 Hz and 60 Hz interference rejection?
The AD7706BRU-REEL achieves 98 dB typical 50/60 Hz rejection through its programmable sinc³ digital filter - the first notch frequency is set via the on-chip clock register to match line frequency (e.g., 50 Hz or 60 Hz). This eliminates need for external analog notch filters and provides consistent rejection across temperature and supply variations, unlike passive RC solutions.
Can the AD7706BRU-REEL perform self-calibration without external components?
Yes, the AD7706BRU-REEL supports full on-chip self-calibration for zero-scale and full-scale errors using internal references - requiring no external voltage sources or precision resistors. Calibration is initiated via software commands to the setup and test registers, and results are stored in dedicated calibration registers. This capability ensures <0.003% nonlinearity remains valid across temperature and time without manual intervention.
What is the function of the COMMON pin on the AD7706BRU-REEL?
The COMMON pin on the AD7706BRU-REEL serves as the shared reference node for all three pseudo-differential analog input channels (AIN1, AIN2, AIN3). Unlike fully differential architectures, this topology reduces pin count and simplifies PCB routing while maintaining adequate common-mode rejection - especially when combined with the device's programmable gain amplifier and digital filtering. It replaces individual negative inputs used in the AD7705BRU-REEL.
AD7706BRU-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 3
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.3V, 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7706BRU-REEL FAQ
1.How can I place an order for AD7706BRU-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7706BRU-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 AD7706BRU-REEL reliable?
The price and inventory of AD7706BRU-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7706BRU-REEL is usually 5 days.
3.What payment methods are accepted for AD7706BRU-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7706BRU-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7706BRU-REEL?
AD7706BRU-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7706BRU-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 AD7706BRU-REEL?
For technical support, including AD7706BRU-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7706BRU-REEL requirements.
6.How does Aetrix verify that AD7706BRU-REEL is sourced from the original manufacturer or authorized distributors?
All AD7706BRU-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 AD7706BRU-REEL meets industry standards.
7.What is the process for return or replacement of AD7706BRU-REEL?
All AD7706BRU-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7706BRU-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 AD7706BRU-REEL part is unused and in its original packaging.
Return procedure for AD7706BRU-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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