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Analog Devices Inc. AD7706BRUZ-REEL7
- Part No.:
- AD7706BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7706BRUZ-REEL7.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,459
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Product details
Overview
AD7706BRUZ-REEL7 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 and targets precision sensor signal conditioning in industrial transmitters and battery-powered instrumentation.
For engineers reviewing the AD7706BRUZ-REEL7 datasheet, AD7706BRUZ-REEL7 pinout, AD7706BRUZ-REEL7 application, or AD7706BRUZ-REEL7 equivalent, key selection criteria include its 3-channel pseudo-differential architecture, on-chip calibration support, 3-wire SPI-compatible serial interface, and compatibility with low-noise transducer front ends requiring ±20 mV to ±2.5 V bipolar input ranges.
Technical Context
The AD7706BRUZ-REEL7 employs a charge-balancing sigma-delta modulator followed by an on-chip digital filter with programmable first-notch frequency, enabling configurable output update rates and 50/60 Hz rejection. Its analog front end includes a programmable-gain amplifier (PGA) and optional input buffer, supporting both unipolar (0 mV to 1.225 V) and bipolar (±10 mV to ±1.225 V) input ranges when using a 1.225 V reference at 3 V supply.
It features differential reference inputs (REF IN(+) and REF IN(−)), a Schmitt-triggered SCLK input, and DRDY-driven data-ready signaling. The device supports self-calibration and system calibration to eliminate zero-scale and full-scale errors, with CMOS construction enabling standby current as low as 8 μA at 3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, no missing codes - guarantees monotonicity and full code coverage for high-fidelity sensor digitization. |
| Input Channels | 3 pseudo-differential - enables simultaneous measurement of three referenced signals (e.g., strain gage bridges sharing COMMON). |
| PGA Gain Range | 1 to 128 - allows direct connection of low-level transducers (e.g., 20 mV full-scale load cells) without external amplification. |
| INL | ±0.003% of FSR - ensures <1 LSB error over full scale at 16-bit resolution, critical for calibrated measurement systems. |
| Power Dissipation | 1 mW max @ 3 V - supports extended battery life in portable or energy-constrained IoT sensor nodes. |
| Reference Input | Differential (REF IN(+)/REF IN(−)) - permits ratiometric measurements and rejection of common-mode noise on reference path. |
| Serial Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible - reduces MCU GPIO count and simplifies isolation in industrial interfaces. |
Pinout & Package
AD7706BRUZ-REEL7 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 3–4 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered input accepting discontinuous or continuous clocks; controls timing of DIN/DOUT data transfers. |
| MCLK IN | Master clock input | Accepts crystal (with MCLK OUT) or external CMOS clock (500 kHz–5 MHz); required for modulator and filter operation. |
| CS | Chip select | Active-low enable for 3-wire mode; when tied low, eliminates need for address decoding in simple microcontroller interfaces. |
| AIN1, AIN2, AIN3 | Analog input channels | Pseudo-differential inputs referenced to COMMON pin; each accepts ±VREF/gain range (e.g., ±10 mV at gain=128, 1.225 V ref). |
| COMMON | Common-mode reference | Shared negative reference for all three analog inputs - defines DC bias point and enables true pseudo-differential operation. |
| REF IN(+), REF IN(−) | Differential reference inputs | Set full-scale range; support ratiometric accuracy and allow reference voltage anywhere between GND and VDD (subject to VREF = 1.225 V or 2.5 V spec). |
| DRDY | Data ready output | Open-drain logic low indicates valid conversion result in data register; synchronizes read operations and prevents partial-word reads. |
| DIN/DOUT | Serial data I/O | Half-duplex 3-wire interface - DIN loads configuration registers; DOUT streams conversion results or register contents. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self- and system calibration | Eliminates zero-scale and full-scale errors in-circuit without external equipment - enables field recalibration of sensor chains. |
| Programmable digital filter notch | Adjustable first-notch frequency (20 Hz, 25 Hz, 50 Hz, 60 Hz) - provides >98 dB normal-mode rejection at line frequencies without external filtering. |
| Input buffer enable (BUF bit) | Reduces source impedance sensitivity and leakage-induced offset drift - essential for high-impedance sensors like thermistors or pH electrodes. |
| Low-power standby mode | 8 μA max current at 3 V - allows periodic wake-up sampling in battery-operated devices while maintaining calibration state. |
| CMOS process with rail-to-rail compatible I/O | Supports mixed-voltage systems: logic inputs accept 0.4 V/2.0 V thresholds at 3 V, and outputs drive standard CMOS loads directly. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
Use Scenario: Digitizing output from bridge-based pressure sensors in HVAC or industrial process controllers. IC Role / Device Role / Timing Role: ADC front end performing PGA gain scaling, sigma-delta conversion, and digital filtering before MCU ingestion. Use Value: Direct interface to mV-level bridge outputs (e.g., 30 mV full-scale) at gain=64 eliminates discrete op-amp stages and improves THD. | Use Scenario: High-accuracy thermocouple or RTD signal acquisition in building automation panels. IC Role / Device Role / Timing Role: Precision analog front end providing cold-junction compensation-ready bipolar input and ratiometric reference tracking. Use Value: ±2.5 V bipolar range with 0.003% INL enables <0.1°C resolution over –40°C to +85°C without external trimming. |
| Smart Transmitter | Battery Voltage Monitoring |
Use Scenario: 4–20 mA loop-powered field transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Primary ADC handling sensor signal, diagnostics, and internal supply monitoring under strict 4 mA loop budget. Use Value: 1 mW power at 3 V and 8 μA standby allow continuous background calibration and low-duty-cycle sensing within loop power limits. | Use Scenario: State-of-charge estimation in portable medical or handheld test equipment. IC Role / Device Role / Timing Role: Low-drift ADC measuring battery terminal voltage and internal cell voltages with programmable gain for multi-cell stacks. Use Value: 16-bit resolution with <600 nV rms noise enables detection of <1 mV changes in 3.7 V Li-ion cells, supporting precise Coulomb counting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7705BRUZ | 2 fully differential input channels; identical PGA, filter, and interface architecture; same 16-lead TSSOP package. | Lacks third analog input channel; requires external multiplexing for >2 sensor inputs. | Select when only two high-precision differential channels are needed and board space must match AD7706BRUZ-REEL7 footprint. |
| ADS124S08IPWR | 24-bit resolution, integrated PGA (1–128), 4-channel differential input, built-in temperature sensor and burnout current sources. | Higher resolution and integrated diagnostics increase BOM count but reduce external component needs. | Choose for next-generation designs requiring enhanced resolution, on-chip diagnostics, or tighter long-term drift specs beyond AD7706BRUZ-REEL7 capabilities. |
Compared with AD7706BRUZ-REEL7, AD7705BRUZ offers identical performance per channel but reduced channel count, while ADS124S08IPWR delivers higher resolution and embedded features at the cost of increased complexity and power - making AD7706BRUZ-REEL7 optimal for cost-sensitive, 3-channel, 16-bit industrial sensor nodes where proven reliability and minimal external components are prioritized.
Availability
AD7706BRUZ-REEL7 is available at Aetrix Electronics and suitable for pressure measurement, smart transmitter design, and battery monitoring applications requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial OEMs.
Supply support for AD7706BRUZ-REEL7 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 product line was designed specifically for low-frequency, high-accuracy sensor signal conditioning in industrial, instrumentation, and process control systems - emphasizing low power, integrated calibration, and robust noise rejection.
FAQ
What is the maximum input voltage range supported by AD7706BRUZ-REEL7 in bipolar mode?
AD7706BRUZ-REEL7 supports bipolar input ranges from ±10 mV to ±2.5 V, depending on selected PGA gain and reference voltage. With a 1.225 V reference at 3 V supply, the usable range is ±10 mV to ±1.225 V; with a 2.5 V reference at 5 V supply, it extends to ±20 mV to ±2.5 V. Absolute input voltage must remain within GND − 100 mV to VDD + 30 mV for specified performance.
Does AD7706BRUZ-REEL7 require an external crystal oscillator?
No - AD7706BRUZ-REEL7 can operate with either an external CMOS clock applied to MCLK IN or a crystal/resonator connected between MCLK IN and MCLK OUT. The device supports master clock frequencies from 500 kHz to 5 MHz; 2.4576 MHz is commonly used for standard 50/60 Hz rejection configurations. No external crystal is mandatory.
How does the COMMON pin function in AD7706BRUZ-REEL7?
The COMMON pin serves as the shared reference node for all three pseudo-differential analog inputs (AIN1, AIN2, AIN3). Unlike fully differential inputs, each channel measures voltage relative to COMMON - enabling simplified wiring for multiple sensors sharing a common return, such as bridge transducers in multi-point monitoring systems. It is not internally connected to GND or REF IN(−).
Can AD7706BRUZ-REEL7 perform self-calibration without host processor intervention?
Yes - AD7706BRUZ-REEL7 supports autonomous self-calibration triggered via its communication register. Writing to the appropriate calibration command bits initiates zero-scale or full-scale calibration sequences that execute entirely on-chip, updating internal coefficients without requiring real-time host supervision or external voltage references.
What serial interface protocols is AD7706BRUZ-REEL7 compatible with?
AD7706BRUZ-REEL7 implements a 3-wire serial interface compatible with SPI®, QSPI™, MICROWIRE™, and generic DSP serial protocols. It uses CS, SCLK, and bidirectional DIN/DOUT lines - no dedicated MOSI/MISO separation. The Schmitt-triggered SCLK input tolerates slow edges and variable duty cycles, easing integration with diverse microcontrollers and isolated digital interfaces.
AD7706BRUZ-REEL7 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-REEL7 FAQ
1.How can I place an order for AD7706BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7706BRUZ-REEL7 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-REEL7 reliable?
The price and inventory of AD7706BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7706BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7706BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7706BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7706BRUZ-REEL7?
AD7706BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7706BRUZ-REEL7 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-REEL7?
For technical support, including AD7706BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7706BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7706BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7706BRUZ-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7706BRUZ-REEL7?
All AD7706BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7706BRUZ-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD7706BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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