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Analog Devices Inc. AD7706BRZ-REEL
- Part No.:
- AD7706BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7706BRZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
AD7706BRZ-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 - designed for precision low-frequency sensor signal acquisition in industrial instrumentation and battery-powered measurement systems.
For engineers reviewing the AD7706BRZ-REEL datasheet, AD7706BRZ-REEL pinout, AD7706BRZ-REEL application, or AD7706BRZ-REEL equivalent, key selection criteria include its 3-channel pseudo-differential architecture, on-chip digital filtering with programmable notch frequency, unipolar/bipolar input range support, SPI/QSPI/MICROWIRE-compatible 3-wire interface, and integrated self/system calibration capability.
Technical Context
The AD7706BRZ-REEL employs a charge-balancing sigma-delta modulator followed by an on-chip digital filter with programmable first-notch cutoff (e.g., 20 Hz, 25 Hz, 50 Hz, 60 Hz) to reject line-frequency interference. Its analog front end includes a fully differential reference input and a programmable-gain amplifier (PGA) that supports gains from 1 to 128, enabling direct connection to low-level transducers such as strain gauges and RTDs.
It operates from a single 2.7 V to 3.3 V or 4.75 V to 5.25 V supply, features Schmitt-triggered SCLK input, and supports buffered or unbuffered analog inputs via the BUF bit in the setup register. The device delivers 16-bit no-missing-codes performance with ±0.003% integral nonlinearity and <600 nV rms noise at 3 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no missing codes - guarantees monotonicity and full code coverage across full temperature range. |
| Input Channels | 3 pseudo-differential channels - AIN1, AIN2, AIN3 referenced to COMMON pin; enables simultaneous multi-sensor monitoring without external multiplexing. |
| PGA Gain Range | 1 to 128 - allows direct digitization of microvolt-level signals (e.g., ±10 mV to ±1.225 V at 3 V) without external amplification. |
| Power Dissipation | 1 mW max at 3 V - enables use in energy-constrained portable and remote sensing applications. |
| Integral Nonlinearity | ±0.003% of FSR - ensures high accuracy in closed-loop control and calibration-critical metrology systems. |
| Digital Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible - reduces PCB routing complexity and isolation component count in noisy industrial environments. |
| Common-Mode Rejection | Up to 130 dB at gain ≥8 - suppresses shared-mode noise from long sensor cables or shared ground paths. |
Pinout & Package
AD7706BRZ-REEL is supplied in a 16-lead SOIC package (width = 7.5 mm, body size 10.3 × 7.5 mm, lead pitch 1.27 mm), RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered logic input controlling data transfer timing; supports discontinuous clocking for low-power burst reads. |
| MCLK IN | Master clock input | Accepts crystal (500 kHz–5 MHz) or CMOS clock; determines conversion rate and filter notch settings. |
| MCLK OUT | Master clock output | Inverted clock output usable as system clock source; disableable via CLKDIS bit to reduce power and EMI. |
| CS | Chip select | Active-low enable for 3-wire serial interface; allows multiple AD7706 devices on shared DIN/DOUT lines. |
| RESET | Hardware reset | Asynchronous active-low signal initializing all registers, filter state, and calibration coefficients to power-on defaults. |
| AIN1 / AIN2 / AIN3 | Analog input terminals | Pseudo-differential channel inputs referenced to COMMON; each accepts ±VREF/gain voltage range with polarity controlled by B/U bit. |
| COMMON | Reference node for AIN1–AIN3 | Shared negative reference for all three input channels - eliminates need for individual differential receivers per channel. |
| REF IN(+), REF IN(−) | Differential reference inputs | Accept 1.225 V (3 V supply) or 2.5 V (5 V supply) reference; enable ratiometric measurements and rejection of reference drift. |
| DRDY | Data ready indicator | Open-drain output signaling valid conversion result; used for interrupt-driven read or polling synchronization. |
| DIN / DOUT | Serial data I/O | Half-duplex 3-wire interface pins - DIN writes configuration registers; DOUT reads data/registers; both share same bus timing. |
| VDD, GND | Power supply | Single 2.7–3.3 V or 4.75–5.25 V supply; internal LDO not required; standby current ≤8 μA at 3 V enables ultra-low-power sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable digital filter notch | Configurable first-notch frequencies (20 Hz, 25 Hz, 50 Hz, 60 Hz) eliminate mains interference without external analog filters. |
| On-chip self-calibration | Zero-scale and full-scale calibration routines remove offset/gain errors at power-up or during operation - no external calibration hardware needed. |
| Bipolar/unipolar mode selection | Software-selectable input polarity via B/U bit enables seamless adaptation to thermocouple (bipolar) or pressure sensor (unipolar) signal ranges. |
| Buffered analog input option | BUF bit enables internal buffer, allowing high-impedance sensor sources (e.g., pH electrodes) to drive ADC directly without external op-amp. |
| High CMRR at high gain | 130 dB common-mode rejection at gains ≥8 ensures accurate measurement in electrically noisy plant-floor environments. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
|
Use Scenario: Digital pressure transmitter acquiring output from a 350 Ω bridge-based piezoresistive sensor in HVAC or process control. IC Role / Device Role / Timing Role: ADC front end performing PGA gain scaling, sigma-delta conversion, and digital filtering before SPI transmission to MCU. Use Value: Direct bridge interface at gain=128 eliminates external instrumentation amplifier; 50/60 Hz notch rejects ambient EMI in factory wiring. |
Use Scenario: Battery-powered handheld thermometer using Pt100 RTD with 4-wire connection in field service equipment. IC Role / Device Role / Timing Role: Precision 3-channel ADC digitizing excitation current sense, RTD voltage, and cold-junction compensation simultaneously. Use Value: Three pseudo-differential inputs allow full 4-wire RTD measurement without external MUX; 16-bit resolution resolves <0.01°C steps. |
| Smart Transmitter | Battery Monitoring |
|
Use Scenario: HART-enabled 4–20 mA loop-powered transmitter integrating sensor signal conditioning and digital communication. IC Role / Device Role / Timing Role: Primary ADC handling analog sensor input while supporting low-power standby mode during HART burst transmission. Use Value: 8 μA standby current extends loop-powered operation; 3-wire interface minimizes isolation components between analog and digital domains. |
Use Scenario: Multi-cell Li-ion battery pack monitor measuring cell voltages, temperature, and current shunt voltage in UPS or EV auxiliary systems. IC Role / Device Role / Timing Role: High-accuracy ADC converting shunt voltage (gain=128), thermistor voltage (gain=1), and reference voltage (gain=1) sequentially. Use Value: Programmable gain allows single ADC to handle µV-level shunt signals and V-level thermistor outputs; on-chip calibration maintains accuracy over life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7705BRZ-REEL | 2 fully differential input channels; identical architecture, register map, and timing; lacks third input channel and COMMON pin. | Not suitable for 3-sensor systems; requires external multiplexer for >2 inputs - adds cost, noise, and calibration complexity. | Select AD7705BRZ-REEL only when exactly two fully differential channels are required and board space/layout constraints favor pin compatibility. |
| ADS124S08IPWR | 24-bit resolution, 4-channel differential, integrated PGA and burnout current; higher power (2.5 mW), different SPI framing and register structure. | Targets higher-precision applications (e.g., weigh scales); requires firmware rewrite and layout revision due to different pinout and biasing requirements. | Choose ADS124S08IPWR when 24-bit resolution and integrated diagnostics outweigh migration effort; AD7706BRZ-REEL remains optimal for cost-sensitive 16-bit 3-channel needs. |
Compared with AD7705BRZ-REEL, AD7706BRZ-REEL provides a dedicated third input and COMMON reference simplifying 3-sensor designs; versus ADS124S08IPWR, it offers proven 16-bit stability at lower power and simpler integration in legacy 3-wire systems.
Availability
AD7706BRZ-REEL is available at Aetrix Electronics and suitable for industrial instrumentation, smart transmitter design, and battery-powered sensor nodes requiring stable component supply, long-term manufacturability, and guaranteed RoHS compliance.
Supply support for AD7706BRZ-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 and manufacturing facilities worldwide.
The AD7705/AD7706 product line was engineered specifically for low-frequency, high-accuracy sensor signal acquisition in resource-constrained embedded systems - emphasizing low power, integrated signal conditioning, and robust noise immunity in harsh electrical environments.
FAQ
What is the maximum sampling rate of the AD7706BRZ-REEL at gain = 1 and MCLK = 2.4576 MHz?
The AD7706BRZ-REEL achieves a maximum output data rate of 38.4 Hz at gain = 1 and MCLK = 2.4576 MHz. This is calculated as fCLKIN / 64 = 2.4576 MHz / 64. At higher gains (≥8), the update rate drops to fCLKIN / 8, yielding 307.2 Hz - but this trades off resolution and noise performance. The AD7706BRZ-REEL's digital filter architecture prioritizes accuracy over speed, making it ideal for static or slowly varying sensor signals.
Does the AD7706BRZ-REEL support true differential input channels like the AD7705BRZ-REEL?
No, the AD7706BRZ-REEL implements three pseudo-differential input channels (AIN1, AIN2, AIN3), all referenced to the COMMON pin - unlike the AD7705BRZ-REEL's two fully differential pairs (AIN1±, AIN2±). This architecture reduces pin count and simplifies PCB layout for multi-sensor systems where a shared reference is acceptable. The AD7706BRZ-REEL's COMMON pin serves as the return path for all three channels, enabling cost-effective 3-channel acquisition without duplicated negative inputs.
Can the AD7706BRZ-REEL operate with a 2.5 V reference when powered from a 3 V supply?
No - the AD7706BRZ-REEL requires matching reference and supply conditions per datasheet specifications: a 1.225 V reference (±1%) is mandatory for 2.7–3.3 V operation, while a 2.5 V reference (±1%) is required for 4.75–5.25 V operation. Using a 2.5 V reference with a 3 V supply violates the specified REF IN(+) − REF IN(−) voltage range (1/1.75 V) and risks degraded INL, increased noise, or undefined behavior. Always pair VDD and VREF per the AD7706BRZ-REEL's dual-supply operating modes.
How does the AD7706BRZ-REEL handle input overvoltage conditions beyond its absolute maximum ratings?
The AD7706BRZ-REEL specifies absolute maximum analog input voltage as GND − 100 mV to VDD + 30 mV for guaranteed performance; operation down to GND − 200 mV is functional but increases leakage current at elevated temperatures. Exceeding these limits risks permanent damage - the part lacks integrated overvoltage protection diodes. System designers must implement external clamping (e.g., series resistors + Schottky diodes to VDD/GND) or isolation (e.g., optocoupled front ends) when interfacing to potentially faulted sensor lines. The AD7706BRZ-REEL itself provides no fault-tolerant input stage.
Is the AD7706BRZ-REEL pin-compatible with other packages of the same part number, such as AD7706BNZ (PDIP) or AD7706BRUZ (TSSOP)?
Yes - all AD7706 variants (AD7706BNZ, AD7706BRZ, AD7706BRUZ) share identical 16-pin functionality and pinout per Figures 3 and 4 in the datasheet. The AD7706BRZ-REEL (SOIC) uses the same pin assignments as the PDIP and TSSOP versions: Pin 1 = SCLK, Pin 2 = MCLK IN, ..., Pin 16 = GND. Mechanical dimensions and thermal characteristics differ, but electrical interface, register mapping, timing, and software drivers are fully interchangeable across packages. Layout changes are required only for footprint and soldering profile - not signal routing.
AD7706BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7706BRZ-REEL FAQ
1.How can I place an order for AD7706BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7706BRZ-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 AD7706BRZ-REEL reliable?
The price and inventory of AD7706BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7706BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7706BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7706BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7706BRZ-REEL?
AD7706BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7706BRZ-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 AD7706BRZ-REEL?
For technical support, including AD7706BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7706BRZ-REEL requirements.
6.How does Aetrix verify that AD7706BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7706BRZ-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 AD7706BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7706BRZ-REEL?
All AD7706BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7706BRZ-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 AD7706BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7706BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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