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Analog Devices Inc. AD7706BRUZ-REEL
- Part No.:
- AD7706BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7706BRUZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,261
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Product details
Overview
AD7706BRUZ-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 operates from 2.7 V to 3.3 V or 4.75 V to 5.25 V, features on-chip digital filtering with configurable notch frequency, and targets precision sensor signal conditioning in industrial transmitters and battery-powered instrumentation.
For engineers reviewing the AD7706BRUZ-REEL datasheet, AD7706BRUZ-REEL pinout, AD7706BRUZ-REEL application, or AD7706BRUZ-REEL equivalent, key selection criteria include its 3-channel pseudo-differential architecture, ±0.003% INL, 16-bit no-missing-codes performance, 3-wire SPI-compatible serial interface, and support for bipolar/unipolar input ranges down to ±10 mV with internal PGA buffering.
Technical Context
The AD7706BRUZ-REEL employs a charge-balancing sigma-delta modulator followed by an on-chip digital filter with programmable first-notch cutoff (20 Hz to 60 Hz), enabling high-rejection of 50/60 Hz line interference. Its analog front end includes a fully differential reference input and a programmable-gain amplifier (PGA) with gains from 1 to 128, allowing direct connection to low-level transducer outputs such as strain gauges and RTDs.
It supports both buffered and unbuffered analog input modes via the BUF bit in the setup register, with absolute input voltage range of GND + 50 mV to VDD − 1.5 V (buffered) or GND − 100 mV to VDD + 30 mV (unbuffered). The device integrates self-calibration and system calibration registers to eliminate zero-scale and full-scale errors across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage over full operating range. |
| Integral Nonlinearity | ±0.003% of FSR - ensures high accuracy for precision measurement without external linearization. |
| Input Channels | 3 pseudo-differential - enables simultaneous acquisition from three sensors referenced to COMMON pin. |
| Programmable Gain | 1 to 128 - allows direct digitization of mV-level signals (e.g., ±10 mV to ±1.225 V) without external amplification. |
| Power Dissipation | 1 mW max at 3 V - supports ultra-low-power operation in battery-powered or thermally constrained systems. |
| Reference Input | Differential (REF IN(+) and REF IN(−)) - accepts 1.225 V (3 V supply) or 2.5 V (5 V supply) references with ±1% tolerance. |
| Serial Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible - reduces MCU GPIO count and simplifies isolation in noisy environments. |
Pinout & Package
AD7706BRUZ-REEL is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for compact PCB layouts and automated assembly. Pin functions are validated per Analog Devices Rev. C datasheet Figures 4 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered logic input accepting discontinuous or continuous clocks up to 2.5 MHz; controls timing of DIN/DOUT data transfers. |
| MCLK IN | Master clock input | Accepts crystal/resonator (500 kHz–5 MHz) or CMOS clock; drives internal oscillator and digital filter timing. |
| MCLK OUT | Master clock output | Inverted clock output usable for synchronizing external circuitry; disableable via CLKDIS bit to reduce power. |
| CS | Chip select | Active-low enable for 3-wire mode; when hardwired low, eliminates need for dedicated chip-select line. |
| RESET | Hardware reset | Active-low signal that resets all registers, digital filter, modulator, and calibration coefficients to power-on state. |
| AIN1 / AIN2 / AIN3 | Pseudo-differential analog inputs | Three single-ended inputs referenced to COMMON pin; each supports unipolar (0–VREF/gain) or bipolar (±VREF/gain) ranges. |
| COMMON | Common-mode reference | Shared reference node for all three analog inputs; replaces AIN(−) pins used in fully differential ADCs like AD7705. |
| REF IN(+), REF IN(−) | Differential reference inputs | Define full-scale range; require REF IN(+) > REF IN(−); support 1.225 V or 2.5 V references with 1% tolerance. |
| DRDY | Data ready indicator | Open-drain output asserts low when new conversion result is available in data register; used for interrupt-driven reads. |
| DIN / DOUT | Serial data I/O | Half-duplex 3-wire interface: DIN loads configuration registers; DOUT reads data/setup/clock registers via communication register addressing. |
| GND / VDD | Power supply terminals | Separate analog/digital ground not required; single 2.7–3.3 V or 4.75–5.25 V supply powers entire device including modulator and digital core. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip digital filter with programmable notch | First notch adjustable from 20 Hz to 60 Hz - enables rejection of 50/60 Hz mains interference without external hardware. |
| Self- and system-calibration capability | Zero-scale and full-scale calibration registers eliminate offset/gain errors - removes need for manual trim components or factory calibration steps. |
| Buffered analog input option | BUF bit enables internal buffer - allows direct connection to high-impedance sources (e.g., thermocouples, pH electrodes) without external op-amps. |
| Low-power standby mode | 8 μA max standby current at 3 V - extends battery life in portable instrumentation while retaining register state. |
| High common-mode rejection | Up to 130 dB CMR at gains ≥8 - suppresses noise coupled equally to all inputs, critical for noisy industrial environments. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
|
Use Scenario: Digitizing output from bridge-based pressure sensors in HVAC or process control transmitters. IC Role / Device Role / Timing Role: Front-end ADC performing PGA amplification, sigma-delta conversion, and digital filtering of low-level mV signals. Use Value: Eliminates external instrumentation amplifier and anti-aliasing filter; achieves <600 nV rms noise and ±0.003% INL for 0.1% FS accuracy. |
Use Scenario: Reading RTD or thermistor outputs in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Low-power ADC with programmable gain and internal reference handling sub-100 μA excitation currents. Use Value: Enables 16-bit resolution over –40°C to +85°C with on-chip calibration - avoids drift-induced recalibration cycles. |
| Smart Transmitter | Battery Voltage Monitoring |
|
Use Scenario: Embedding in 4–20 mA loop-powered field devices requiring HART compatibility. IC Role / Device Role / Timing Role: Precision ADC interfacing with microcontroller via 3-wire SPI, supporting dual-channel diagnostics and primary measurement. Use Value: Reduces component count vs. discrete signal chain; 1 mW power budget fits within 3.5 mA loop margin at 24 V. |
Use Scenario: Monitoring Li-ion cell voltage and current sense in portable medical or IoT devices. IC Role / Device Role / Timing Role: High-accuracy ADC measuring 0–4.2 V cell voltage and ±100 mV shunt voltage with shared reference. Use Value: Achieves ±0.5 mV absolute accuracy using internal 2.5 V reference and 128× gain - enables precise SOC estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7705BRUZ-REEL | 2 fully differential input channels; identical PGA, filter, and serial interface; same 16-lead TSSOP package. | Requires matched differential sensor pairs; less channel density than AD7706BRUZ-REEL for single-ended sources. | Select when fully differential inputs (e.g., load cells) are preferred and third channel is unnecessary. |
| ADS114S08IPWR | 12-channel, 16-bit delta-sigma ADC with integrated PGA, reference, and sensor bias; 32-pin TQFP package. | Higher integration (excitation current sources, burnout detection) but larger footprint and higher cost. | Choose when scaling beyond 3 channels or requiring integrated sensor excitation and diagnostics. |
Compared with AD7705BRUZ-REEL, AD7706BRUZ-REEL provides one additional pseudo-differential input and COMMON-referenced architecture better suited for single-ended transducers, while ADS114S08IPWR trades pin count and simplicity for multi-channel scalability and embedded sensor interface features.
Availability
AD7706BRUZ-REEL is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, and smart transmitter designs requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for AD7706BRUZ-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.
The AD7705/AD7706 family was designed specifically for low-frequency, high-accuracy sensor signal conditioning in industrial, instrumentation, and process control systems where resolution, noise, and power efficiency are critical.
FAQ
What is the maximum sampling rate of the AD7706BRUZ-REEL at gain = 1 and MCLK = 2.4576 MHz?
The AD7706BRUZ-REEL achieves a maximum output data rate of 38.4 Hz at gain = 1 and MCLK = 2.4576 MHz, calculated as fCLKIN/64. This rate is selectable via the filter notch setting and supports high-rejection 50/60 Hz line noise filtering. Higher update rates (e.g., 19.2 Hz or 9.6 Hz) are available with deeper digital filtering for improved noise performance. The AD7706BRUZ-REEL maintains 16-bit no-missing-codes integrity across all supported data rates.
Does the AD7706BRUZ-REEL support bipolar input ranges, and how is it configured?
Yes, the AD7706BRUZ-REEL supports bipolar input ranges (e.g., ±10 mV to ±1.225 V) by setting the B/U bit in the setup register to 0. Inputs are referenced to the COMMON pin, and the full-scale range is ±VREF/gain. For example, with VREF = 1.225 V and gain = 128, the input range is ±9.57 mV. The device automatically handles sign extension and offset binary coding in bipolar mode. This configuration is confirmed in the AD7706BRUZ-REEL datasheet Section "Bipolar/Unipolar Input" and Table 1.
Can the AD7706BRUZ-REEL operate with an external 2.5 V reference when powered from a 3 V supply?
No - the AD7706BRUZ-REEL requires the reference voltage to match the supply condition: a 1.225 V reference is specified for 2.7–3.3 V operation, and a 2.5 V reference for 4.75–5.25 V operation. Using a 2.5 V reference with a 3 V supply violates the REF IN(+) voltage limit (must be ≤ VDD) and risks incorrect conversion or damage. The AD7706BRUZ-REEL datasheet explicitly states "VREF = 1.225 ± 1% for specified performance" under 3 V conditions. Always pair VREF and VDD per the recommended operating conditions table.
How does the COMMON pin function in the AD7706BRUZ-REEL compared to AIN(−) pins in the AD7705?
The COMMON pin in the AD7706BRUZ-REEL serves as the shared reference node for all three pseudo-differential analog inputs (AIN1, AIN2, AIN3), unlike the AD7705's fully differential architecture which uses separate AIN1(−) and AIN2(−) pins. This simplifies PCB layout for single-ended sensors and reduces pin count, but requires all inputs to share the same common-mode voltage. The AD7706BRUZ-REEL's COMMON pin must remain within GND + 50 mV to VDD − 1.5 V (buffered) or GND − 100 mV to VDD + 30 mV (unbuffered) for specified performance.
Is the AD7706BRUZ-REEL pin-compatible with other members of the AD7705/AD7706 family in TSSOP packages?
Yes - the AD7706BRUZ-REEL shares identical pinout, package dimensions, and footprint with AD7705BRUZ-REEL and AD7706BN in 16-lead TSSOP. All variants use the same mechanical outline and electrical pin assignments per Figure 4 and Table 4 of the Rev. C datasheet. This allows drop-in replacement between AD7705 and AD7706 in TSSOP packages, though firmware must be updated to accommodate the different channel count and COMMON pin usage in AD7706BRUZ-REEL.
AD7706BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7706BRUZ-REEL FAQ
1.How can I place an order for AD7706BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7706BRUZ-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 AD7706BRUZ-REEL reliable?
The price and inventory of AD7706BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7706BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7706BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7706BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7706BRUZ-REEL?
AD7706BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7706BRUZ-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 AD7706BRUZ-REEL?
For technical support, including AD7706BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7706BRUZ-REEL requirements.
6.How does Aetrix verify that AD7706BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7706BRUZ-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 AD7706BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7706BRUZ-REEL?
All AD7706BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7706BRUZ-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 AD7706BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7706BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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