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Analog Devices Inc. AD7796BRUZ-REEL
- Part No.:
- AD7796BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7796BRUZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,737
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Product details
Overview
AD7796BRUZ-REEL from Analog Devices is a low-power, 16-bit sigma-delta ADC optimized for bridge sensor front ends, featuring an integrated instrumentation amplifier (gain = 128), on-chip temperature sensor (±2°C accuracy), internal 64 kHz clock oscillator, and simultaneous 50 Hz/60 Hz rejection - enabling high-precision weigh scale and strain gage measurement at 4.17–123 Hz update rates.
For engineers reviewing the AD7796BRUZ-REEL datasheet, AD7796BRUZ-REEL pinout, AD7796BRUZ-REEL application, or AD7796BRUZ-REEL equivalent, key selection criteria include its 65 nV RMS noise at 4.17 Hz, 250 µA typical supply current, 16-lead TSSOP package with independent AVDD/DVDD supplies, and SPI-compatible 3-wire serial interface supporting QSPI/MICROWIRE protocols.
Technical Context
The AD7796BRUZ-REEL implements a fully integrated analog front end with a fixed-gain (×128) instrumentation amplifier directly conditioning low-level bridge outputs, a Σ-Δ modulator with programmable digital filter, and dual-supply operation (AVDD: 2.7–5.25 V; DVDD: 2.7–5.25 V). Its internal temperature sensor connects directly to the ADC input path for real-time thermal compensation of bridge elements.
It supports both internal and external clocking modes - with CLK pin configurable as output (internal clock) or input (external 64 kHz or 128 kHz with divide-by-2) - enabling synchronized multi-ADC systems and enhanced 50/60 Hz rejection via precise external timing. The device delivers no-missing-codes performance over its full 16-bit range and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no-missing-codes; effective resolution up to 16 bits (p-p) at 4.17 Hz with 2.5 V reference |
| RMS Noise | 65 nV at 4.17 Hz update rate - enables sub-µV-level signal resolution in precision bridge applications |
| Update Rate Range | 4.17 Hz to 123 Hz, software-programmable via mode register FS[3:0] bits - balances speed vs. noise for industrial weighing |
| Supply Current | 250 µA typical at 3 V AVDD; drops to 1 µA in power-down mode - extends battery life in portable instrumentation |
| Input Gain | Fixed ×128 instrumentation amplifier - eliminates external gain stages for mV-range bridge outputs (e.g., 2 mV/V) |
| Power Supply Range | AVDD: 2.7–5.25 V; DVDD: 2.7–5.25 V - allows independent analog/digital rail optimization and mixed-voltage system integration |
| Temperature Sensor | On-chip ±2°C accurate sensor with 0.81 mV/°C sensitivity - enables direct cold-junction or bridge temperature compensation without external components |
Pinout & Package
AD7796BRUZ-REEL is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 12 is GND; pins 4, 7, 8, and 11 are no-connect (NC); AVDD (Pin 13) and DVDD (Pin 14) are separate supply inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Schmitt-triggered for noise immunity; supports opto-isolated interfaces and continuous/noncontinuous clocking |
| CLK (Pin 2) | Clock I/O | Configurable as internal clock output or external clock input - enables synchronization of multiple ADCs |
| CS (Pin 3) | Chip select | Active-low frame sync; can be hardwired low for 3-wire operation (SCLK/DIN/DOUT/RDY only) |
| AIN(+) / AIN(−) (Pins 5–6) | Differential analog input | Direct connection point for bridge sensor outputs; common-mode voltage range: 0.5 V to AVDD − 1.1 V |
| REFIN(+) / REFIN(−) (Pins 9–10) | Reference input | Accepts 0.1 V to AVDD external reference; nominal 2.5 V differential; 100 dB CMRR ensures stable scaling |
| DOUT/RDY (Pin 15) | Serial data output / data ready | Dual-function pin: outputs conversion data and asserts low to signal valid result - usable as interrupt source |
| DIN (Pin 16) | Serial data input | Loads configuration registers (mode, config, offset, full-scale) and initiates read/write operations via communication register |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz/60 Hz rejection | 80 dB min at both frequencies using internal clock; improves to 94 dB min at 50 Hz with external clock - eliminates mains interference without external notch filters |
| Integrated instrumentation amplifier | Fixed ×128 gain with ±1 µV offset error and ±10 nV/°C drift - enables direct digitization of 10–20 mV bridge outputs without external op-amps |
| Independent AVDD/DVDD supplies | Separate analog and digital rails allow 3 V DVDD logic interfacing with 5 V AVDD sensor excitation - reduces digital noise coupling into analog path |
| On-chip temperature sensor | ±2°C accuracy (calibrated), 0.81 mV/°C sensitivity, internally connected to ADC - provides real-time thermal correction for bridge nonlinearity and zero drift |
| Low-power operation | 250 µA typical active current, 1 µA power-down current - supports battery-powered handheld scales and field instruments with >1-year runtime |
Applications
| Weigh Scales | Strain Gage Monitoring |
|---|---|
|
Use Scenario: High-accuracy platform scales and retail counting scales measuring loads from 100 g to 100 kg with <10 mg resolution. IC Role / Device Role / Timing Role: Primary ADC front end; digitizes mV-level Wheatstone bridge output from load cells; performs synchronous sampling at 4.17–123 Hz. Use Value: 65 nV RMS noise and 16-bit no-missing-codes guarantee stable 1:65,536 resolution; internal temp sensor enables automatic zero-point drift correction across –40°C to +85°C. |
Use Scenario: Structural health monitoring of bridges, cranes, or pressure vessels using bonded foil strain gages under varying ambient temperatures. IC Role / Device Role / Timing Role: Signal conditioner and digitizer; amplifies and converts microstrain-induced bridge imbalances; integrates temperature compensation in real time. Use Value: Fixed ×128 gain eliminates external amplification; simultaneous 50/60 Hz rejection suppresses EMI from nearby motors or lighting; 250 µA current enables solar-powered remote nodes. |
| Industrial Process Control | Portable Instrumentation |
|
Use Scenario: Pressure transmitters and level sensors in chemical plants requiring SIL-2 compliant analog-to-digital conversion with long-term stability. IC Role / Device Role / Timing Role: Precision ADC subsystem; interfaces with 4–20 mA loop-powered sensors via ratiometric bridge excitation; handles calibration and diagnostics. Use Value: ±10 ppm FSR INL and ±3 ppm/°C gain drift ensure metrological accuracy over 10+ years; AVDD monitor and burnout current detection support functional safety diagnostics. |
Use Scenario: Handheld multimeters, torque analyzers, and portable calibration tools needing ultra-low power, small footprint, and high noise immunity. IC Role / Device Role / Timing Role: Core measurement engine; acquires DC-coupled sensor data with minimal external components; manages sleep/wake cycles via RDY interrupt. Use Value: 16-lead TSSOP fits compact PCBs; 1 µA power-down current enables instant-on wake-up; Schmitt-triggered SCLK tolerates noisy handheld environments. |
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 |
|---|---|---|---|
| AD7795BRUZ | 24-bit resolution, higher RMS noise (120 nV @ 4.17 Hz), same pinout and register map - requires recalibration for 16-bit system compatibility | Targeted at higher-resolution weighing (e.g., analytical balances) where 1 µg resolution is required | Select AD7795BRUZ only if 24-bit resolution and ≥19-bit effective bits are mandatory; AD7796BRUZ-REEL offers lower noise per bit and better power efficiency for 16-bit use cases. |
| ADS1232IPW | 24-bit delta-sigma ADC with PGA (1–128), but no integrated temp sensor or internal oscillator; requires external clock and reference | Used in cost-sensitive industrial scales where external components are acceptable to reduce BOM count | Choose ADS1232IPW when system already includes precision reference/clock and thermal compensation is handled externally; AD7796BRUZ-REEL reduces design complexity with full integration. |
Compared with AD7795BRUZ and ADS1232IPW, the AD7796BRUZ-REEL uniquely combines 16-bit precision, ultra-low 65 nV noise, integrated temp sensing, and internal clock in a single 16-pin TSSOP - minimizing component count and layout area while delivering optimal power/noise trade-off for mid-tier weighing and process control.
Availability
AD7796BRUZ-REEL is available at Aetrix Electronics and suitable for weigh scales, strain gage systems, and industrial process control equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability for medical and industrial certifications.
Supply support for AD7796BRUZ-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 Wilmington, MA, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7796BRUZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-power, high-accuracy bridge sensor measurement - emphasizing integrated signal conditioning, noise immunity, and ease of calibration in harsh industrial environments.
FAQ
What is the maximum update rate supported by the AD7796BRUZ-REEL?
The AD7796BRUZ-REEL supports a maximum output update rate of 123 Hz, achieved by programming the mode register's FS[3:0] bits to 0000. At this rate, RMS noise rises to 0.43 µV and effective resolution decreases to 16.5 bits (p-p), making it suitable for dynamic weighing or fast-response industrial control loops where speed outweighs ultimate noise performance.
Does the AD7796BRUZ-REEL require an external reference voltage?
No - the AD7796BRUZ-REEL operates with either an external reference (0.1 V to AVDD, nominal 2.5 V) or uses the internal bandgap as a reference when REFIN(+) and REFIN(−) are tied appropriately. However, external referencing is recommended for highest accuracy, as the internal reference exhibits ±0.5% initial tolerance and 30 ppm/°C drift - whereas a precision 2.5 V reference maintains <10 ppm/°C stability.
How does the AD7796BRUZ-REEL handle temperature compensation for bridge sensors?
The AD7796BRUZ-REEL integrates a calibrated on-chip temperature sensor (±2°C accuracy, 0.81 mV/°C sensitivity) that connects directly to the ADC input multiplexer. Users can sequentially sample the bridge output and temperature sensor, then apply linear or polynomial compensation in firmware - eliminating need for external thermistors or RTDs and reducing system BOM and calibration effort.
Can the AD7796BRUZ-REEL operate with different analog and digital supply voltages?
Yes - the AD7796BRUZ-REEL features independent AVDD (2.7–5.25 V) and DVDD (2.7–5.25 V) supplies. This allows interfacing with 3 V microcontrollers while powering the analog front end at 5 V for improved SNR, or vice versa. Digital I/O levels (SCLK, DIN, DOUT/RDY, CS) are referenced to DVDD, ensuring robust logic compatibility across mixed-voltage systems.
Is the AD7796BRUZ-REEL pin-compatible with the AD7797BRUZ?
Yes - the AD7796BRUZ-REEL and AD7797BRUZ share identical 16-lead TSSOP packaging, pinout, register map, and interface protocol. The primary difference is resolution: AD7796BRUZ-REEL is 16-bit, while AD7797BRUZ is 24-bit. Firmware designed for one can typically run on the other with minor configuration adjustments, though noise performance and effective resolution differ significantly at matching update rates.
AD7796BRUZ-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):
- 123
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7796BRUZ-REEL FAQ
1.How can I place an order for AD7796BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7796BRUZ-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 AD7796BRUZ-REEL reliable?
The price and inventory of AD7796BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7796BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7796BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7796BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7796BRUZ-REEL?
AD7796BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7796BRUZ-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 AD7796BRUZ-REEL?
For technical support, including AD7796BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7796BRUZ-REEL requirements.
6.How does Aetrix verify that AD7796BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7796BRUZ-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 AD7796BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7796BRUZ-REEL?
All AD7796BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7796BRUZ-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 AD7796BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7796BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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