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Analog Devices Inc. AD7799BRUZ-REEL
- Part No.:
- AD7799BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7799BRUZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,438
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Product details
Overview
AD7799BRUZ-REEL from Analog Devices is a 24-bit, low-noise, low-power Σ-Δ analog-to-digital converter with integrated instrumentation amplifier, three differential input channels, and on-chip reference detect. It delivers 27 nV rms noise at 4.17 Hz update rate (gain = 64) and operates from 2.7 V to 5.25 V supply, targeting high-precision industrial sensor interfaces such as strain gauge and pressure transducers.
For engineers reviewing the AD7799BRUZ-REEL datasheet, AD7799BRUZ-REEL pinout, AD7799BRUZ-REEL application, or AD7799BRUZ-REEL equivalent, key selection considerations include its 24-bit effective resolution at low update rates, simultaneous 50/60 Hz rejection, programmable gain (1–128), internal clock oscillator, and 16-lead TSSOP package with independent AVDD/DVDD supplies.
Technical Context
The AD7799BRUZ-REEL integrates a low-noise instrumentation amplifier front-end with selectable gain (1–128), enabling direct connection of low-level sensor outputs without external signal conditioning. Its Σ-Δ modulator supports software-programmable output data rates from 4.17 Hz to 470 Hz and includes built-in digital filtering for simultaneous 50 Hz and 60 Hz line-frequency rejection.
It features an internal 64 kHz clock oscillator, reference voltage detection (NOXREF flag), low-side power switch (PSW), burnout currents, and programmable digital I/O pins (P1/P2). The serial interface is SPI-/QSPI-/MICROWIRE-/DSP-compatible with Schmitt-triggered SCLK and supports independent analog (AVDD) and digital (DVDD) supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit effective (no missing codes), validated at ≤242 Hz update rate |
| RMS Noise | 27 nV at 4.17 Hz, gain = 64 - enables sub-µV signal digitization in weigh scale and pressure systems |
| Update Rate | 4.17 Hz to 470 Hz - software-selectable for trade-off between noise performance and throughput |
| INL Error | ±15 ppm of FSR - ensures high linearity for precision measurement without frequent recalibration |
| Power Consumption | 380 µA typical - supports battery-powered portable instrumentation and low-power industrial nodes |
| Common-Mode Rejection | 100 dB min at DC and 50/60 Hz - maintains accuracy in noisy industrial environments |
| Supply Range | AVDD/DVDD: 2.7 V to 5.25 V - allows flexible dual-rail operation and compatibility with 3.3 V/5 V systems |
Pinout & Package
AD7799BRUZ-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 functions are fully defined per Analog Devices Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered for noise immunity; supports opto-isolated interfaces and variable clock frequency |
| CS | Chip select (active low) | Enables 3-wire mode when hardwired low; provides frame sync for multi-device SPI buses |
| AIN3(+)/P1 | Configurable analog input or digital output | Dual-role pin: positive terminal of third differential channel or general-purpose output referenced to AVDD/GND |
| AIN3(−)/P2 | Configurable analog input or digital output | Dual-role pin: negative terminal of third differential channel or general-purpose output referenced to AVDD/GND |
| AIN1(+), AIN1(−), AIN2(+), AIN2(−) | Differential analog inputs | Three dedicated differential input pairs (AIN1, AIN2, AIN3); support unbuffered/buffered/in-amp modes |
| REFIN(+), REFIN(−) | External reference inputs | Accept 0.1 V to AVDD reference; enable ratiometric or absolute measurements with reference detect |
| PSW | Low-side power switch | Internal MOSFET (RON ≤ 9 Ω @ 3 V) for sensor excitation control and power cycling |
| DOUT/RDY | Data output / conversion ready | Combines serial data output and interrupt-capable RDY signal; falls to indicate valid conversion result |
| DIN | Serial data input | Loads configuration registers (mode, config, offset, full-scale) and initiates read/write operations |
| AVDD, DVDD, GND | Power and ground rails | Independent analog (AVDD) and digital (DVDD) supplies decouple noise; GND is common reference point |
Key Features
| Feature | Design Value |
|---|---|
| On-chip instrumentation amplifier | Programmable gain (1–128) eliminates need for external signal conditioning in bridge sensor applications |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-accelerated digital filter rejects both line frequencies without firmware overhead or timing constraints |
| Reference detect (NOXREF) | Monitors REFIN voltage and asserts flag if below 0.3 V - prevents invalid conversions due to reference loss |
| Burnout current sources | Internal 0.2 µA/2 µA current sources enable open-circuit detection in RTD or thermocouple wiring |
| Low-side power switch (PSW) | Integrated 30 mA-rated switch controls excitation current to sensors, reducing BOM count and PCB area |
| Independent AVDD/DVDD supplies | Allows analog section to run at 5 V for dynamic range while digital interface operates at 3.3 V for MCU compatibility |
Applications
| Weigh Scales | Pressure Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in platform scales and industrial weighing systems operating at 4.17–16.7 Hz update rates. IC Role / Device Role / Timing Role: Primary ADC with integrated in-amp digitizes mV-level bridge outputs; performs simultaneous 50/60 Hz rejection to suppress mains interference. Use Value: 27 nV rms noise at 4.17 Hz enables >21-bit effective resolution, supporting 1:100,000+ weight ratio measurement without external amplification. |
Use Scenario: Differential pressure sensing in HVAC controllers and process transmitters using silicon piezoresistive elements. IC Role / Device Role / Timing Role: Front-end ADC with programmable gain (16–64) conditions low-output sensors; PSW pin controls bridge excitation sequencing. Use Value: ±15 ppm INL and 100 dB CMR ensure stable calibration over temperature and long-term drift <10 ppm/°C. |
| Strain Gauge Transducers | Portable Instrumentation |
Use Scenario: Static and quasi-static strain monitoring in structural health systems and materials testing rigs. IC Role / Device Role / Timing Role: Precision ADC with burnout currents detects open-wire faults; reference detect ensures valid readings during battery voltage sag. Use Value: 380 µA typical supply current and 1 µA power-down mode extend battery life in field-deployed wireless nodes. |
Use Scenario: Handheld multimeters and portable gas analyzers requiring high DC accuracy and low self-heating. IC Role / Device Role / Timing Role: Core measurement engine with internal clock and 24-bit resolution; supports single-supply 3.3 V operation via DVDD/AVDD independence. Use Value: Offset error drift of ±10 nV/°C and gain drift of ±1 ppm/°C minimize recalibration frequency in field instruments. |
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 |
|---|---|---|---|
| AD7798BRUZ-REEL | 16-bit resolution, lower noise floor (40 nV @ 4.17 Hz), 300 µA typical current, same pinout and register map | Targeted at cost-sensitive 16-bit applications where 24-bit resolution is unnecessary | Select AD7798BRUZ-REEL when system resolution requirements are ≤16 bits and lower power is prioritized |
| ADS124S08IPWR | 24-bit, 4-kSPS max, integrated PGA (1–128), 2.5 V internal reference, 32-pin TQFP package | Higher speed and integrated reference simplify design but require larger PCB footprint and lack PSW/REF detect | Choose ADS124S08IPWR for faster sampling or when internal reference suffices; AD7799BRUZ-REEL preferred for PSW, reference detect, and TSSOP space constraints |
Compared with AD7798BRUZ-REEL and ADS124S08IPWR, AD7799BRUZ-REEL uniquely combines 24-bit resolution, ultra-low noise at sub-10 Hz rates, integrated low-side switch, and reference fault detection in a compact 16-lead TSSOP-making it optimal for space-constrained, safety-aware industrial sensor nodes requiring guaranteed validity of each conversion.
Availability
AD7799BRUZ-REEL is available at Aetrix Electronics and suitable for weigh scales, pressure transmitters, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for AD7799BRUZ-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.
The AD7799 is part of Analog Devices' precision Σ-Δ ADC product line, designed specifically for low-power, high-accuracy industrial and scientific measurement systems interfacing with resistive, capacitive, or bridge-based sensors.
FAQ
What is the maximum update rate supported by the AD7799BRUZ-REEL?
The AD7799BRUZ-REEL supports an output data rate from 4.17 Hz up to 470 Hz, selected via the FS[3:0] bits in the mode register. At 470 Hz, the effective resolution drops to 16.5 bits (peak-to-peak) with gain = 128, while maintaining no missing codes across the full 24-bit range at rates ≤242 Hz.
Does the AD7799BRUZ-REEL require an external crystal or clock source?
No, the AD7799BRUZ-REEL includes an internal 64 kHz clock oscillator with ±3% tolerance, eliminating the need for external timing components. External clocks may be used via the SCLK pin, but the internal oscillator is sufficient for most precision measurement applications including 50/60 Hz rejection.
How does the reference detect feature work on the AD7799BRUZ-REEL?
The AD7799BRUZ-REEL monitors the voltage across REFIN(+) and REFIN(−) and sets the NOXREF bit in the status register if the reference falls below 0.3 V. This flag alerts the host processor to invalid conversions before they are read, preventing erroneous measurements in systems with unstable or disconnected references.
Can the AD7799BRUZ-REEL drive a resistive load directly using its PSW pin?
Yes - the PSW pin is an integrated low-side N-channel MOSFET switch rated for ≤30 mA continuous current and ≤9 Ω RON at 3 V AVDD. It is designed to control excitation current to bridge sensors, RTDs, or other low-power analog front-end loads without external discrete switches.
Is the AD7799BRUZ-REEL compatible with 3.3 V microcontrollers?
Yes - the AD7799BRUZ-REEL supports independent DVDD and AVDD supplies, allowing DVDD to be set to 3.3 V while AVDD runs at 5 V. Its digital interface is SPI/QSPI/MICROWIRE-compatible, and all logic thresholds scale with DVDD, ensuring robust communication with 3.3 V MCUs.
AD7799BRUZ-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
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7799BRUZ-REEL FAQ
1.How can I place an order for AD7799BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7799BRUZ-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 AD7799BRUZ-REEL reliable?
The price and inventory of AD7799BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7799BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7799BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7799BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7799BRUZ-REEL?
AD7799BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7799BRUZ-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 AD7799BRUZ-REEL?
For technical support, including AD7799BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7799BRUZ-REEL requirements.
6.How does Aetrix verify that AD7799BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7799BRUZ-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 AD7799BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7799BRUZ-REEL?
All AD7799BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7799BRUZ-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 AD7799BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7799BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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