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Analog Devices Inc. AD7794BRUZ
- Part No.:
- AD7794BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7794BRUZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:794
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Product details
Overview
AD7794BRUZ from Analog Devices is a 24-bit, low-noise, low-power Σ-Δ analog-to-digital converter with integrated instrumentation amplifier, on-chip band gap reference (4 ppm/°C drift), six differential inputs, and programmable excitation current sources. It delivers 23 effective bits at 4.17 Hz, 40 nV RMS noise, and operates from 2.7 V to 5.25 V - ideal for high-precision weigh scales and strain gage transducers.
For engineers reviewing the AD7794BRUZ datasheet, AD7794BRUZ pinout, AD7794BRUZ application, or AD7794BRUZ equivalent, key selection criteria include guaranteed 24-bit no-missing-codes performance up to 242 Hz, simultaneous 50/60 Hz rejection, internal clock oscillator, and TSSOP-24 packaging compatible with industrial temperature range (–40°C to +105°C).
Technical Context
The AD7794BRUZ integrates a chopper-stabilized instrumentation amplifier with gain settings from 1 to 128, enabling direct interface to low-level sensor outputs such as bridge-based pressure transducers. Its Σ-Δ modulator features digital filtering with programmable output data rates (4.17–470 Hz) and supports both internal and external clocking for synchronization across multi-channel systems.
On-chip functionality includes dual programmable current sources (10/210/1000 μA), bias voltage generator (AVDD/2), low-side power switch (RON ≤ 9 Ω), reference detect circuitry, and burnout current capability - all managed via a 3-wire SPI-compatible serial interface with Schmitt-triggered SCLK for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes up to 242 Hz; enables 1 ppm-level measurement precision in static industrial sensing. |
| RMS Noise | 40 nV @ 4.17 Hz - supports sub-microvolt signal resolution in high-gain, low-bandwidth applications like load cells. |
| Supply Current | 400 μA typical - allows battery-powered operation for portable instrumentation with >1-year runtime on coin cell. |
| Reference Drift | 4 ppm/°C typical - ensures <±0.5 LSB error over full –40°C to +105°C range without external calibration. |
| Input Channels | Six fully differential analog inputs - supports multiplexed sensor arrays (e.g., 3× full-bridge pressure sensors) without external MUX. |
| Update Rate | 4.17 Hz to 470 Hz - configurable for trade-off between noise performance and throughput in real-time control loops. |
| Common-Mode Rejection | 100 dB min @ DC - maintains accuracy despite ground shifts in noisy industrial environments with long sensor cables. |
Pinout & Package
AD7794BRUZ is housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 4 is NC; pins 5/6 and 15/16 support dual-function analog/digital I/O.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial clock input | Schmitt-triggered for opto-isolated interfaces; supports continuous or burst-mode SPI communication. |
| CS (Pin 3) | Chip select | Active-low enable; allows 3-wire mode when hardwired low, reducing PCB routing complexity. |
| AIN1(+) to AIN3(–) (Pins 7–12) | Differential analog inputs | Three dedicated differential pairs for simultaneous multi-sensor acquisition without external amplification. |
| AIN4(+)/REFIN2(+) (Pin 17) | Shared analog input / reference input | Enables dual-reference architecture: REFIN1 for primary ADC reference, REFIN2 for auxiliary channel or ratiometric sensing. |
| AIN5(+)/IOUT2 (Pin 15) | Excitation current output | Programmable 10/210/1000 μA source - powers RTDs or bridge sensors while sharing analog input path to minimize component count. |
| P1 (AIN6(+)) / P2 (AIN6(–)) (Pins 5/6) | General-purpose digital outputs | Configurable GPIOs referenced to AVDD/GND - drive LEDs, relays, or status indicators without external drivers. |
| PSW (Pin 19) | Low-side power switch | Controls bridge sensor power between conversions; reduces system power by >90% during idle periods. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz/60 Hz rejection | 80 dB min rejection at line frequency with internal clock - eliminates need for external notch filters in AC-powered industrial sites. |
| On-chip bias voltage generator | AVDD/2 output - sets common-mode voltage for buffered inputs, enabling rail-to-rail analog signal handling without external resistive dividers. |
| Programmable burnout currents | Enables open-wire detection in 4-wire RTD circuits - improves system reliability by identifying broken sensor leads before measurement errors occur. |
| Independent interface supply (DVDD) | Allows DVDD = 1.8–5.25 V while AVDD = 2.7–5.25 V - supports mixed-voltage systems with 1.8 V microcontrollers interfacing to 5 V analog front ends. |
| Internal clock oscillator | 64 kHz ±3% - eliminates external crystal/capacitor, reducing BOM cost and board area while maintaining timing accuracy for synchronized sampling. |
Applications
| Temperature Measurement | Pressure Measurement |
|---|---|
Use Scenario: High-accuracy RTD or thermistor readout in HVAC controllers and environmental monitoring systems. IC Role / Device Role / Timing Role: ADC with integrated excitation current sources and burnout detection performs ratiometric conversion of resistance-based sensors. Use Value: Eliminates external current sources and reference buffers; achieves ±0.1°C accuracy over –40°C to +105°C without calibration. |
Use Scenario: Industrial pressure transmitters using Wheatstone bridge sensors in oil & gas pipeline monitoring. IC Role / Device Role / Timing Role: Front-end digitizer with low-side power switch cycles bridge excitation to minimize self-heating drift. Use Value: Reduces total system power to <1 mW per measurement cycle while maintaining 24-bit resolution and 100 dB CMR. |
| Weigh Scales | Strain Gage Transducers |
Use Scenario: Legal-for-trade platform scales and truck scales requiring NTEP-certified 6,000 d resolution. IC Role / Device Role / Timing Role: Precision ADC with 40 nV RMS noise and 23 effective bits captures microvolt-level output from load cells. Use Value: Meets OIML R76 Class III requirements with single-chip solution; no external PGA or reference needed. |
Use Scenario: Structural health monitoring in bridges and aircraft using bonded foil strain gages. IC Role / Device Role / Timing Role: Low-drift, low-noise digitizer with programmable gain (up to 128×) conditions millivolt-level bridge outputs. Use Value: Delivers <0.005% FS nonlinearity and ±1 μV offset error - enables sub-10 με strain resolution in static measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision Σ-Δ ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7124-8BRUZ | 8-channel, 24-bit, 19.2 kSPS max, built-in PGA with 1–128 gain, no on-chip excitation sources | Better suited for high-channel-count, medium-speed data loggers; lacks integrated current sources for RTD excitation | Select AD7794BRUZ when excitation current sourcing, burnout detection, and ultra-low noise (<40 nV) at sub-10 Hz are required. |
| LTC2449CG#PBF | 24-bit, 4-channel, 120 dB CMR, 1.5 μV offset, but no integrated in-amp or reference; requires external PGA and ref | Targeted at metrology-grade bench instruments where external component optimization is acceptable | Choose AD7794BRUZ for integrated signal chain simplicity and guaranteed 24-bit performance without external calibration. |
Compared with AD7124-8BRUZ and LTC2449CG#PBF, the AD7794BRUZ uniquely combines on-chip instrumentation amplifier, excitation current sources, and 4 ppm/°C reference in a single TSSOP-24 package - reducing bill-of-materials by up to 7 components while maintaining 23 effective bits at 4.17 Hz.
Availability
AD7794BRUZ is available at Aetrix Electronics and suitable for weigh scales, pressure transmitters, and industrial process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7794BRUZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7794BRUZ belongs to Analog Devices' precision Σ-Δ ADC product line, designed specifically for high-resolution sensor measurement in resource-constrained industrial and instrumentation applications where integration, low power, and guaranteed specifications matter.
FAQ
What is the maximum guaranteed resolution of AD7794BRUZ without missing codes?
The AD7794BRUZ guarantees 24-bit no-missing-codes performance at output update rates up to 242 Hz when chop mode is enabled. This specification is production-tested and ensures monotonicity across the full input range under all specified operating conditions including –40°C to +105°C and 2.7 V to 5.25 V supply.
Does AD7794BRUZ support simultaneous 50 Hz and 60 Hz line frequency rejection?
Yes, the AD7794BRUZ provides simultaneous 50 Hz and 60 Hz rejection of ≥80 dB minimum using its internal digital filter with programmable output data rates. This feature is implemented in hardware and requires no firmware intervention - it functions identically across all gain settings and input configurations.
Can AD7794BRUZ operate with an external reference voltage?
Yes, the AD7794BRUZ accepts two independent external differential references (REFIN1 and REFIN2) ranging from 0.1 V to AVDD. When using external references, the device maintains ±10 μV full-scale error and ±1 ppm/°C gain drift for gains 1–16, making it suitable for ratiometric and absolute measurement topologies.
What are the functions of pins P1 and P2 on AD7794BRUZ?
Pins P1 (AIN6(+)) and P2 (AIN6(–)) serve dual roles: as the sixth differential analog input pair, or as general-purpose digital outputs referenced to AVDD and GND. These pins can be configured via on-chip registers to drive LEDs, activate relays, or signal system status - eliminating need for external GPIO expanders in compact designs.
How does the low-side power switch (PSW) improve system power efficiency in AD7794BRUZ?
The PSW pin on AD7794BRUZ controls a low-RON (≤9 Ω) switch that disconnects bridge sensor excitation between conversions. In a typical weigh scale application sampling at 10 Hz, this reduces average sensor power by >95%, directly lowering self-heating drift and extending battery life without compromising measurement integrity.
AD7794BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 470
- Number of Inputs:
- 6
- 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7794BRUZ FAQ
1.How can I place an order for AD7794BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7794BRUZ 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 AD7794BRUZ reliable?
The price and inventory of AD7794BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7794BRUZ is usually 5 days.
3.What payment methods are accepted for AD7794BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7794BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7794BRUZ?
AD7794BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7794BRUZ 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 AD7794BRUZ?
For technical support, including AD7794BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7794BRUZ requirements.
6.How does Aetrix verify that AD7794BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7794BRUZ 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 AD7794BRUZ meets industry standards.
7.What is the process for return or replacement of AD7794BRUZ?
All AD7794BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7794BRUZ, 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 AD7794BRUZ part is unused and in its original packaging.
Return procedure for AD7794BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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