My Inquiry
My Account
Analog Devices Inc. AD7797BRUZ
- Part No.:
- AD7797BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7797BRUZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,914
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7797BRUZ 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 datasheet, AD7797BRUZ pinout, AD7797BRUZ application, or AD7797BRUZ equivalent, this page delivers verified specifications, TSSOP-16 pin mapping, real-world use cases in industrial process control and portable instrumentation, and two validated alternative ADCs with documented functional trade-offs.
Technical Context
The AD7797BRUZ implements a fully integrated Σ-Δ modulator with on-chip digital filter, programmable output data rate (4.17–123 Hz), and internal 64 kHz clock (±3% tolerance). Its bipolar/unipolar configurable input supports ±VREF/128 differential range with 90 dB common-mode rejection at DC and 50/60 Hz.
It features a dedicated 16-bit mode register controlling clock source (internal/external), filter update rate (FS[3:0]), and operating mode, alongside a status register with RDY and ERR flags. The serial interface uses 3-wire SPI-compatible protocol with Schmitt-triggered SCLK and independent DVDD supply for logic-level flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Noise | 65 nV at 4.17 Hz - enables 19-bit effective resolution for ultra-low-noise bridge signal digitization |
| Resolution | 24-bit (AD7797 only) - provides 16.5-bit peak-to-peak resolution at 4.17 Hz for stable code output |
| Update Rate | 4.17 Hz to 123 Hz - software-selectable via FS[3:0] bits for optimal noise/speed trade-off per application |
| Power Consumption | 250 µA typical at 3 V AVDD - supports battery-powered portable instrumentation with 1 µA power-down mode |
| Input Range | ±VREF/128 with ×128 PGA - directly interfaces mV-level outputs from full-bridge sensors without external amplification |
| 50/60 Hz Rejection | 90 dB min at both frequencies - eliminates mains interference in industrial environments without external notch filters |
| Temperature Sensor | ±2°C accuracy (calibrated), 0.81 mV/°C sensitivity - enables on-chip cold-junction compensation for bridge temperature drift |
Pinout & Package
AD7797BRUZ is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin 12 is GND; pins 4, 7, 8, and 11 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial Clock Input | Schmitt-triggered clock input supporting opto-isolation; accepts continuous or burst-mode timing for flexible MCU interfacing |
| CLK (Pin 2) | Clock In/Out | Configurable as internal clock output or external 64 kHz clock input - enables synchronization of multiple AD7797BRUZ devices |
| CS (Pin 3) | Chip Select | Active-low enable for multi-device SPI buses; can be hardwired low for simplified 3-wire operation (SCLK/DIN/DOUT/RDY) |
| AIN(+) / AIN(−) (Pins 5–6) | Differential Analog Input | High-impedance (±250 pA avg) inputs accepting ±VREF/128 range - directly connects to Wheatstone bridge outputs |
| REFIN(+) / REFIN(−) (Pins 9–10) | Reference Input | Accepts 0.1 V to AVDD reference voltage; nominal 2.5 V reference enables 19-bit effective resolution at lowest update rate |
| DOUT/RDY (Pin 15) | Data Output / Ready Flag | Combines serial data output and conversion-complete interrupt - falling edge signals valid data availability to host processor |
| DIN (Pin 16) | Serial Data Input | Writes configuration registers (mode, config, offset, full-scale); supports 32-bit reset sequence on DIN line loss recovery |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Instrumentation Amplifier | Fixed ×128 gain with 90 dB CMRR - eliminates need for external signal conditioning in bridge sensor applications |
| Simultaneous 50 Hz/60 Hz Rejection | 90 dB min rejection at both frequencies - removes AC line interference without firmware-based digital filtering |
| Internal Temperature Sensor | ±2°C accuracy with 0.81 mV/°C output - enables real-time thermal compensation of bridge sensor offset and gain drift |
| Independent Interface Supply (DVDD) | 2.7 V to 5.25 V DVDD decoupled from AVDD - allows mixed-voltage systems (e.g., 3.3 V logic with 5 V analog rail) |
| Low-Power Operation | 250 µA typical current, 1 µA power-down - extends battery life in portable weighing and field instrumentation |
Applications
| Weigh Scales | Strain Gage Monitoring |
|---|---|
|
Use Scenario: High-precision platform scales measuring loads from 100 g to 100 kg in commercial and laboratory settings. IC Role / Device Role / Timing Role: Primary ADC capturing mV-level differential output from load cell bridges; performs simultaneous 50/60 Hz rejection during each 4.17–16.7 Hz conversion cycle. Use Value: 19-bit effective resolution at 4.17 Hz enables sub-gram resolution without external amplifiers or notch filters. |
Use Scenario: Structural health monitoring of bridges and buildings using bonded foil strain gages under variable ambient conditions. IC Role / Device Role / Timing Role: Front-end ADC with integrated temperature sensor providing real-time thermal drift correction for long-term measurement stability. Use Value: On-chip 0.81 mV/°C temperature sensing and ±2°C accuracy allow automatic offset/gain compensation without external sensors. |
| Industrial Process Control | Portable Instrumentation |
|
Use Scenario: Pressure transmitters in chemical plants where 4–20 mA loop-powered sensors require high-accuracy digitization amid EMI-rich environments. IC Role / Device Role / Timing Role: Isolated ADC interface with Schmitt-triggered SCLK and 90 dB normal-mode rejection - rejects conducted noise on long sensor cables. Use Value: 250 µA supply current and 1 µA power-down mode reduce thermal loading and extend system uptime between maintenance cycles. |
Use Scenario: Handheld torque analyzers used in automotive assembly lines requiring battery operation and millisecond-level response. IC Role / Device Role / Timing Role: Low-power 24-bit ADC with programmable update rate (up to 123 Hz) delivering fast, high-resolution readings during dynamic torque events. Use Value: 123 Hz maximum update rate enables 8.1 ms sampling period - sufficient for capturing transient mechanical events in handheld tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 16-bit resolution, same 16-lead TSSOP package, identical pinout and register map - but lacks temperature sensor and has higher 100 nV rms noise | Targeted at cost-sensitive weigh scales where 16-bit resolution suffices and thermal compensation is handled externally | Select when lower resolution and absence of on-chip temperature sensing are acceptable to reduce BOM count |
| ADS124S08IPW | 24-bit resolution, integrated PGA (1–128), but requires external reference and offers no built-in 50/60 Hz rejection - needs firmware-based digital filtering | Suitable for multi-channel sensor systems where channel count and programmable gain outweigh single-cycle AC rejection needs | Choose when system-level flexibility (e.g., multiple gain settings, daisy-chain capability) is prioritized over out-of-box 50/60 Hz immunity |
Compared with AD7797BRUZ, AD7792BRUZ trades resolution and temperature sensing for lower cost and identical footprint, while ADS124S08IPW adds multi-channel support and gain flexibility at the expense of requiring external reference design and custom firmware for mains rejection.
Availability
AD7797BRUZ 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 guaranteed traceable sourcing.
Supply support for AD7797BRUZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.
The AD779x series was designed specifically for high-accuracy, low-power bridge sensor signal chains in industrial weighing, process control, and portable test equipment - emphasizing integrated functionality, noise performance, and ease of system integration.
FAQ
What is the maximum effective resolution achievable with the AD7797BRUZ?
The AD7797BRUZ achieves up to 19-bit effective resolution at its slowest update rate of 4.17 Hz, measured with a 2.5 V reference and bipolar input range. This corresponds to 65 nV rms noise and 16.5-bit peak-to-peak resolution - ensuring stable code output without flicker in precision weigh scale applications. At 123 Hz, effective resolution drops to 16.5 bits.
Does the AD7797BRUZ require an external reference voltage?
No, the AD7797BRUZ operates with either an external reference applied across REFIN(+) and REFIN(−) or uses its internal reference path - though it does not contain an internal voltage reference. A nominal 2.5 V external reference is recommended to achieve specified 19-bit effective resolution; the device supports reference voltages from 0.1 V to AVDD, with 400 nA/V average input current.
How does the AD7797BRUZ handle 50 Hz and 60 Hz interference rejection?
The AD7797BRUZ provides simultaneous hardware-based 50 Hz and 60 Hz rejection of ≥90 dB minimum through its digital filter architecture - achieved without external components or firmware intervention. This rejection is enabled by default and optimized for internal 64 kHz clock operation; using an accurate external clock further improves rejection to ≥94 dB at 50 Hz.
Can the AD7797BRUZ interface directly with a microcontroller running at 1.8 V I/O voltage?
Yes, the AD7797BRUZ supports independent DVDD supply (2.7 V to 5.25 V), allowing logic levels to be referenced to a separate 1.8 V domain via level-shifting circuitry. While DVDD itself must be ≥2.7 V, the Schmitt-triggered SCLK and configurable CS/DIN/DOUT/RDY pins enable robust interfacing with lower-voltage MCUs when paired with standard bidirectional level translators.
What is the function of the DOUT/RDY pin on the AD7797BRUZ?
The DOUT/RDY pin on the AD7797BRUZ serves dual roles: as a serial data output for reading conversion results and configuration registers, and as a data-ready flag that goes low upon completion of each ADC conversion. Its falling edge can trigger a processor interrupt, eliminating polling overhead - and it remains low until the data register is read or a new conversion completes.
AD7797BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7797BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7797BRUZ 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 reliable?
The price and inventory of AD7797BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7797BRUZ is usually 5 days.
3.What payment methods are accepted for AD7797BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7797BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7797BRUZ?
AD7797BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7797BRUZ 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?
For technical support, including AD7797BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7797BRUZ requirements.
6.How does Aetrix verify that AD7797BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7797BRUZ 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 meets industry standards.
7.What is the process for return or replacement of AD7797BRUZ?
All AD7797BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7797BRUZ, 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 part is unused and in its original packaging.
Return procedure for AD7797BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7797BRUZ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
