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Analog Devices Inc. AD7793BRUZ-REEL
- Part No.:
- AD7793BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7793BRUZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,510
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Product details
Overview
AD7793BRUZ-REEL 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, and three differential analog inputs. It delivers 40 nV rms noise at 4.17 Hz update rate (gain = 64), consumes 400 μA typical supply current, and operates from 2.7 V to 5.25 V. It is designed for high-precision sensor measurement in thermocouple, RTD, and smart transmitter systems.
For engineers reviewing the AD7793BRUZ-REEL datasheet, AD7793BRUZ-REEL pinout, AD7793BRUZ-REEL application, or AD7793BRUZ-REEL equivalent, key selection considerations include its 24-bit effective resolution at low update rates, programmable excitation current sources (10/210/1000 μA), simultaneous 50 Hz/60 Hz rejection, and 16-lead TSSOP package with independent AVDD/DVDD supplies.
Technical Context
The AD7793BRUZ-REEL integrates a low-noise instrumentation amplifier (gain 1–128), a precision 1.17 V internal band gap reference (4 ppm/°C drift), and a fully configurable Σ-Δ modulator with digital filter supporting output rates from 4.17 Hz to 470 Hz. Its architecture enables direct interface to low-level sensors without external signal conditioning.
It features dual programmable current sources (IOUT1/IOUT2), on-chip bias voltage generator (AVDD/2), burnout detection currents, and Schmitt-triggered serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols. The device supports both internal 64 kHz clock and external clock synchronization for multi-ADC systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit effective (AD7793); up to 23 bits effective resolution at 4.17 Hz with gain = 64 |
| RMS Noise | 40 nV @ 4.17 Hz (gain = 64, external 2.5 V ref); enables sub-μV-level signal digitization |
| Supply Current | 400 μA typical (AVDD = 5 V, gain = 4–128, internal reference); supports battery-powered portable instrumentation |
| Update Rate | Software-programmable 4.17 Hz to 470 Hz; allows trade-off between noise performance and throughput |
| Reference | Internal 1.17 V band gap (4 ppm/°C drift typ); also accepts external differential reference (0.1 V to AVDD) |
| Input Channels | 3 differential analog inputs (AIN1, AIN2, AIN3); supports multiplexed high-precision sensor arrays |
| Excitation Sources | Two programmable current sources (10/210/1000 μA); enables direct 2-/3-/4-wire RTD and bridge sensor biasing |
| Power Supply | AVDD: 2.7 V–5.25 V; DVDD: 2.7 V–5.25 V (independent); supports mixed-voltage system interfacing |
Pinout & Package
AD7793BRUZ-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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; enables opto-isolated interfaces and robust timing in noisy industrial environments |
| CLK | Clock in/out | Configurable as internal clock output or external clock input; supports synchronized multi-ADC sampling |
| CS | Chip select (active low) | Enables 3-wire mode when hardwired low; serves as frame sync in multi-device SPI daisy chains |
| IOUT1 / IOUT2 | Programmable excitation current outputs | Deliver 10/210/1000 μA; used for RTD biasing, bridge excitation, or sensor burnout detection |
| AIN1(+) / AIN1(−) AIN2(+) / AIN2(−) REFIN(+)/AIN3(+) / REFIN(−)/AIN3(−) |
Differential analog inputs | Three fully differential input channels; AIN3 shares pins with reference inputs for flexible configuration |
| DOUT/RDY | Data output / data ready indicator | Combines serial data output and conversion-complete interrupt; simplifies host processor polling/interrupt handling |
| DIN | Serial data input | Loads configuration registers (mode, config, offset, full-scale); enables real-time gain/rate reconfiguration |
| AVDD / DVDD / GND | Analog/digital supply and ground | Independent AVDD/DVDD rails allow analog section isolation and mixed-voltage logic interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz/60 Hz rejection | 80 dB min rejection at both line frequencies using internal clock; eliminates need for external notch filters in AC-coupled industrial environments |
| On-chip bias voltage generator | Outputs AVDD/2 to set common-mode voltage; enables rail-to-rail input operation for buffered/unbuffered modes without external components |
| Programmable gain instrumentation amplifier | Gain range 1–128; allows direct connection of mV-level thermocouple or microvolt-level strain gauge outputs without external op-amps |
| Burnout current sources | Internally generated; detects open-circuit RTD or thermocouple faults by monitoring input channel continuity during idle cycles |
| Internal clock oscillator | 64 kHz ±3%; eliminates external crystal/capacitor BOM cost and layout area while maintaining precise update rate control |
| Independent interface supply (DVDD) | 2.7 V–5.25 V range; permits direct interfacing to 3.3 V or 5 V microcontrollers without level shifters |
Applications
| Thermocouple Measurement | RTD-Based Temperature Sensing |
|---|---|
|
Use Scenario: Cold-junction compensated thermocouple readout in furnace controllers and environmental chambers. IC Role / Device Role / Timing Role: ADC front end with integrated in-amp, reference, and burnout detection; performs low-drift, low-noise digitization of μV-level Seebeck voltages. Use Value: Achieves <±2°C accuracy over –40°C to +105°C without external calibration, leveraging 40 nV rms noise and 4 ppm/°C reference drift. |
Use Scenario: 3-wire or 4-wire platinum RTD (PT100/PT1000) measurement in process transmitters and HVAC sensors. IC Role / Device Role / Timing Role: Precision ADC with matched 10/210/1000 μA excitation sources and ratiometric reference support; handles lead-wire resistance compensation. Use Value: Enables 0.01°C resolution at 4.17 Hz with <±0.1°C total error, eliminating external current sources and reference buffers. |
| Portable Blood Analysis Devices | Smart Industrial Transmitters |
|
Use Scenario: Battery-powered handheld analyzers measuring electrochemical sensor outputs (e.g., glucose, lactate). IC Role / Device Role / Timing Role: Ultra-low-power ADC subsystem with 1 μA power-down mode and 400 μA active current; digitizes nanoamp-level sensor currents via programmable gain in-amp. Use Value: Extends single-cell Li-ion battery life to >12 months in intermittent-use medical devices while maintaining 24-bit resolution. |
Use Scenario: HART-enabled 4–20 mA loop-powered transmitters for pressure, flow, and level sensing in hazardous areas. IC Role / Device Role / Timing Role: Signal conditioner and ADC with isolated serial interface; provides galvanically isolated analog input, diagnostics, and digital output via HART modem. Use Value: Reduces component count by integrating reference, excitation, bias, and filtering-cutting PCB area by 40% vs. discrete solutions. |
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 (vs. 24-bit); identical pinout, package, and feature set except resolution and noise floor (higher rms noise at same gain/rate) | Suitable for cost-sensitive applications where 16-bit resolution suffices (e.g., basic temperature monitoring) | Select AD7792BRUZ only if system SNR requirements are ≤98 dB and effective resolution ≤16 bits is acceptable. |
| ADS124S08IPW | Texas Instruments part: 24-bit, 4-kSPS max, integrated PGA (1–128), but no on-chip reference or excitation sources; requires external 2.048 V ref and current sources | Better suited for higher-speed, lower-noise applications where external reference stability is tightly controlled | Choose ADS124S08IPW when higher throughput (>470 Hz) or lower INL (±1 ppm vs. ±15 ppm) is required, and board space allows external support components. |
Compared with AD7793BRUZ-REEL, AD7792BRUZ offers identical integration and footprint at reduced resolution, while ADS124S08IPW trades built-in reference/excitation for higher speed and lower INL-making AD7793BRUZ-REEL optimal for self-contained, ultra-low-noise, low-power sensor nodes requiring minimal external components.
Availability
AD7793BRUZ-REEL is available at Aetrix Electronics and suitable for thermocouple measurement, RTD-based temperature sensing, portable blood analysis devices, and smart industrial transmitters requiring stable component supply across extended temperature ranges (–40°C to +105°C) and long production lifecycles.
Supply support for AD7793BRUZ-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, with design and manufacturing operations worldwide.
The AD7793 is part of Analog Devices' precision analog front-end (AFE) product line, engineered specifically for high-resolution, low-power sensor measurement in industrial, medical, and scientific instrumentation where noise, drift, and integration density are critical.
FAQ
What is the maximum effective resolution achievable with the AD7793BRUZ-REEL?
The AD7793BRUZ-REEL achieves up to 23 bits effective resolution at 4.17 Hz update rate with gain = 64 and external 2.5 V reference, as confirmed in Table 6 of the datasheet. This corresponds to ~40 nV rms noise and supports sub-microvolt signal resolution in high-precision applications like laboratory-grade DVMs and analytical instruments. The AD7793BRUZ-REEL maintains ≥20 bits effective resolution across multiple gain settings and update rates, enabling flexible system-level SNR optimization.
Does the AD7793BRUZ-REEL support simultaneous 50 Hz and 60 Hz line frequency rejection?
Yes, the AD7793BRUZ-REEL provides simultaneous 50 Hz and 60 Hz normal-mode rejection of ≥80 dB minimum when using the internal clock, as specified in the "Normal Mode Rejection" section of the datasheet (Rev. B, Page 3). This is achieved through programmable digital filter settings (FS[3:0] = 1010), eliminating the need for external analog notch filters in industrial environments with variable AC line interference.
Can the AD7793BRUZ-REEL operate with separate analog and digital supply voltages?
Yes, the AD7793BRUZ-REEL features independent AVDD (2.7 V–5.25 V) and DVDD (2.7 V–5.25 V) supplies, allowing analog and digital sections to be powered from different rails. This enables direct interfacing with 3.3 V microcontrollers while maintaining a 5 V analog reference path, improving noise immunity and simplifying power domain isolation in mixed-signal systems containing the AD7793BRUZ-REEL.
What are the supported excitation current values on IOUT1 and IOUT2 of the AD7793BRUZ-REEL?
The AD7793BRUZ-REEL provides two programmable excitation current sources (IEXC1 and IEXC2) routed to IOUT1 and IOUT2, each configurable for 10 μA, 210 μA, or 1000 μA nominal output. These currents exhibit ±5% initial tolerance at 25°C and 200 ppm/°C drift, enabling accurate 2-/3-/4-wire RTD measurements, resistive bridge excitation, and open-circuit fault detection without external current sources.
Is the AD7793BRUZ-REEL pin-compatible with the AD7792BRUZ?
Yes, the AD7793BRUZ-REEL is pin-compatible and package-compatible with the AD7792BRUZ (both 16-lead TSSOP), sharing identical pinout, register map, and interface protocol. The primary functional difference is resolution: AD7793BRUZ-REEL delivers 24-bit capability with lower noise, while AD7792BRUZ is limited to 16-bit. This allows drop-in replacement in existing designs where enhanced resolution is required without PCB revision.
AD7793BRUZ-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):
- 470
- Number of Inputs:
- 3
- 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
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7793BRUZ-REEL FAQ
1.How can I place an order for AD7793BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7793BRUZ-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 AD7793BRUZ-REEL reliable?
The price and inventory of AD7793BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7793BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7793BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7793BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7793BRUZ-REEL?
AD7793BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7793BRUZ-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 AD7793BRUZ-REEL?
For technical support, including AD7793BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7793BRUZ-REEL requirements.
6.How does Aetrix verify that AD7793BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7793BRUZ-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 AD7793BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7793BRUZ-REEL?
All AD7793BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7793BRUZ-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 AD7793BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7793BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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