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Analog Devices Inc. AD7797BRUZ-REEL
- Part No.:
- AD7797BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7797BRUZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
AD7797BRUZ-REEL from Analog Devices is a 24-bit sigma-delta analog-to-digital converter optimized for bridge sensor front ends, featuring 65 nV rms noise, fixed-gain (×128) instrumentation amplifier, integrated temperature sensor, and simultaneous 50/60 Hz rejection - enabling high-accuracy weigh scale and strain gage measurements at 4.17–123 Hz update rates.
For engineers reviewing the AD7797BRUZ-REEL datasheet, AD7797BRUZ-REEL pinout, AD7797BRUZ-REEL application, or AD7797BRUZ-REEL equivalent, key selection considerations include its 16-lead TSSOP package, 250 µA typical supply current, 2.7–5.25 V dual-supply operation (AVDD/DVDD), SPI-compatible 3-wire interface, and internal clock oscillator eliminating external timing components.
Technical Context
The AD7797BRUZ-REEL implements a Σ-Δ modulator with sinc3 digital filter, supporting software-programmable output data rates from 4.17 Hz to 123 Hz and delivering up to 19 effective bits (16.5 p-p) at 4.17 Hz with a 2.5 V reference. Its on-chip instrumentation amplifier provides fixed ×128 gain, enabling direct connection of low-level bridge outputs without external signal conditioning.
It integrates a calibrated temperature sensor (±2°C accuracy, 0.81 mV/°C sensitivity) connected internally to the ADC channel, allowing real-time thermal compensation of bridge sensors. The device supports both internal 64 kHz oscillator and external clock inputs, with configurable CLK pin functionality for synchronization across multiple ADCs in multi-channel systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Noise | 65 nV at 4.17 Hz - enables sub-microvolt resolution for ultra-low-level bridge signals |
| Resolution | 24-bit output with 19 effective bits (p-p: 16.5) at slowest rate - ensures no code flicker in precision weighing |
| Update Rate | 4.17 Hz to 123 Hz - selectable via mode register FS[3:0] bits for trade-off between noise and speed |
| Supply Current | 250 µA typical (3 V AVDD) - supports battery-powered portable instrumentation |
| Power-Down Current | 1 µA max - enables rapid sleep/wake cycles in energy-constrained systems |
| Input Range | ±VREF/128 - matches typical bridge output swing when using 2.5 V reference |
| 50/60 Hz Rejection | 90 dB min (internal clock), 94 dB min at 50 Hz (external clock) - eliminates mains interference without external notch filters |
Pinout & Package
AD7797BRUZ-REEL is housed in a 16-lead TSSOP (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin 1 marked by dot; pins 4, 7, 8, and 11 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered for noise immunity; supports opto-isolated interfaces and noncontinuous clocking |
| CLK | Clock I/O | Configurable as internal clock output or external clock input - enables synchronized multi-ADC sampling |
| CS | Chip select | Active-low; allows 3-wire operation when hardwired low, reducing interface wiring count |
| AIN(+), AIN(−) | Differential analog input | Direct connection point for Wheatstone bridge outputs; accepts common-mode voltage from 0.5 V to AVDD − 1.1 V |
| REFIN(+), REFIN(−) | Reference input | Accepts 0.1 V to AVDD reference; nominal 2.5 V - supports ratiometric or absolute measurement modes |
| DOUT/RDY | Combined data output / conversion ready | Functions as interrupt-capable RDY signal or serial data output - simplifies host processor polling/interrupt handling |
| DIN | Serial data input | Writes to communication, mode, configuration, offset, and full-scale registers - enables full runtime reconfiguration |
| AVDD, DVDD | Analog/digital supplies | Independent 2.7–5.25 V rails - permits mixed-voltage system integration (e.g., 5 V AVDD, 3.3 V DVDD) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier | Fixed ×128 gain eliminates need for external op-amp stage in bridge sensor interfaces |
| On-chip temperature sensor | ±2°C accuracy with 0.81 mV/°C output - enables real-time thermal drift correction without external sensor |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-filtered rejection at both frequencies - removes mains interference without firmware overhead or external filters |
| Internal 64 kHz clock oscillator | 64 ± 3% kHz, 50:50 duty cycle - eliminates external crystal/capacitor, reducing BOM and layout complexity |
| Low-power operation | 250 µA typical active current, 1 µA power-down - extends battery life in portable instrumentation |
Applications
| Weigh Scales | Strain Gage Monitoring |
|---|---|
|
Use Scenario: High-precision platform scales for industrial and commercial use requiring <10 ppm linearity and temperature stability over –40°C to +85°C. IC Role / Device Role / Timing Role: Primary ADC front end with integrated gain and temperature sensing - digitizes mV-level bridge output while compensating for thermal drift. Use Value: Achieves 19-bit effective resolution at 4.17 Hz, enabling 1:1,000,000 dynamic range without external amplification or calibration hardware. |
Use Scenario: Structural health monitoring of bridges or machinery using bonded foil strain gages under varying ambient temperatures. IC Role / Device Role / Timing Role: Signal conditioner and digitizer - acquires differential strain voltage and reads on-chip temperature sensor simultaneously for real-time compensation. Use Value: Eliminates separate temperature sensor and analog multiplexer, reducing component count and PCB area while maintaining ±0.01% full-scale accuracy. |
| Portable Instrumentation | Industrial Process Control |
|
Use Scenario: Handheld torque testers and load cells powered by coin-cell batteries requiring >100-hour operation per charge. IC Role / Device Role / Timing Role: Low-power ADC subsystem - operates from single 3 V supply with 250 µA current and 1 µA shutdown mode. Use Value: Enables continuous 12.5 Hz sampling for 5 days on CR2032, with no external clock or reference needed beyond 2.5 V reference IC. |
Use Scenario: Factory-floor pressure transmitters interfacing 350 Ω bridge sensors in noisy 24 V DC environments with 50/60 Hz EMI. IC Role / Device Role / Timing Role: Immune analog front end - uses internal clock and sinc3 filter to reject mains interference without external filtering. Use Value: Delivers 80 dB normal-mode rejection at 50/60 Hz with internal clock, avoiding costly shielded cabling or active filters in PLC-connected systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision bridge sensor ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7124-4BRUZ | 4-channel, 24-bit Σ-Δ ADC with PGA (1–128), lower noise (27 nV), but higher current (380 µA); includes burnout currents and AVDD monitor | Multi-sensor systems requiring channel scanning; less suitable for single-bridge cost-sensitive designs | Choose AD7124-4BRUZ when multi-channel acquisition or enhanced diagnostics (e.g., open-wire detection) are required |
| ADS124S08IPW | Texas Instruments part: 24-bit, 4-kSPS max, integrated PGA (1–128), 200 µA current, but no on-chip temperature sensor or simultaneous 50/60 Hz rejection | Higher-speed applications needing >123 Hz updates; requires external temperature compensation logic | Choose ADS124S08IPW when sampling rate >123 Hz is mandatory and external thermal compensation is acceptable |
Compared with AD7797BRUZ-REEL, AD7124-4BRUZ offers superior noise and multi-channel flexibility at higher power and cost, while ADS124S08IPW trades off integrated temperature sensing and mains rejection for higher throughput - making AD7797BRUZ-REEL optimal for single-channel, low-power, thermally compensated bridge measurement where 123 Hz is sufficient.
Availability
AD7797BRUZ-REEL is available at Aetrix Electronics and suitable for weigh scales, strain gage systems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for AD7797BRUZ-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 a legacy of precision data conversion innovation since 1965.
The AD7797 is part of Analog Devices' precision sigma-delta ADC product line, designed specifically for low-power, high-resolution bridge sensor measurement in industrial and instrumentation applications - emphasizing integrated signal conditioning, noise immunity, and ease of system integration.
FAQ
What is the maximum effective resolution achievable with the AD7797BRUZ-REEL?
The AD7797BRUZ-REEL achieves up to 19 effective bits (16.5 peak-to-peak) at its slowest update rate of 4.17 Hz when using a 2.5 V reference. This resolution is derived from its 65 nV rms noise floor and applies to bipolar input configurations. At faster rates like 123 Hz, effective resolution drops to 16.5 bits (13.5 p-p), as confirmed in Table 7 of the AD7796/AD7797 Rev. B datasheet.
Does the AD7797BRUZ-REEL require an external clock to achieve 50/60 Hz rejection?
No - the AD7797BRUZ-REEL achieves simultaneous 50 Hz and 60 Hz rejection using its internal 64 kHz clock oscillator. With internal clock enabled, it delivers minimum 65 dB rejection at both frequencies (80 dB typical). External clock improves rejection further (e.g., 94 dB min at 50 Hz), but is not required for basic mains interference suppression.
How does the on-chip temperature sensor in the AD7797BRUZ-REEL interface with the ADC?
The AD7797BRUZ-REEL's temperature sensor is internally connected to the same ADC channel used for AIN(+) and AIN(−). It is accessed by configuring the configuration register to select the temperature sensor input instead of the analog input pair. Its output is calibrated to ±2°C accuracy and provides 0.81 mV/°C sensitivity, enabling direct thermal compensation of bridge measurements without external components.
Can the AD7797BRUZ-REEL operate with different analog and digital supply voltages?
Yes - the AD7797BRUZ-REEL supports independent AVDD (2.7–5.25 V) and DVDD (2.7–5.25 V) supplies. This allows mixed-voltage operation, such as AVDD = 5 V for analog performance while DVDD = 3.3 V for compatibility with 3.3 V microcontrollers. Logic levels on SCLK, CS, DIN, and DOUT/RDY are referenced to DVDD, not AVDD.
What is the function of the DOUT/RDY pin on the AD7797BRUZ-REEL?
The DOUT/RDY pin on the AD7797BRUZ-REEL serves dual roles: as a serial data output during read operations, and as a data-ready indicator that goes low upon conversion completion. When used as RDY, it can trigger a microcontroller interrupt; when used as DOUT, it shifts out conversion data on SCLK falling edges. The pin automatically toggles between modes based on interface commands - no external logic is needed.
AD7797BRUZ-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:
- 24
- 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:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7797BRUZ-REEL FAQ
1.How can I place an order for AD7797BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7797BRUZ-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 AD7797BRUZ-REEL reliable?
The price and inventory of AD7797BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7797BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7797BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7797BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7797BRUZ-REEL?
AD7797BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7797BRUZ-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 AD7797BRUZ-REEL?
For technical support, including AD7797BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7797BRUZ-REEL requirements.
6.How does Aetrix verify that AD7797BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7797BRUZ-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 AD7797BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7797BRUZ-REEL?
All AD7797BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7797BRUZ-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 AD7797BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7797BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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