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Analog Devices Inc. AD7798BRUZ-REEL
- Part No.:
- AD7798BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7798BRUZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,225
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Product details
Overview
AD7798BRUZ-REEL from Analog Devices is a 16-bit, low-noise, low-power Σ-Δ analog-to-digital converter with integrated instrumentation amplifier, 3 differential input channels, 4.17–470 Hz programmable output update rate, and 40 nV rms noise at 4.17 Hz - designed for precision sensor signal conditioning in industrial weigh scales and pressure transducers.
For engineers reviewing the AD7798BRUZ-REEL datasheet, AD7798BRUZ-REEL pinout, AD7798BRUZ-REEL application, or AD7798BRUZ-REEL equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready procurement support - all grounded in the official AD7798/AD7799 Rev. B datasheet.
Technical Context
The AD7798BRUZ-REEL implements a fully integrated analog front end with a low-noise, programmable-gain instrumentation amplifier (gain = 1 to 128), a 16-bit Σ-Δ modulator, on-chip reference detect, burnout current sources, and a low-side power switch (RON ≤ 9 Ω at 3 V). Its internal clock oscillator eliminates external timing components.
It supports simultaneous 50 Hz/60 Hz rejection via software-configurable filter settings (FS[3:0]), operates from 2.7 V to 5.25 V AVDD and independent 2.7 V to 5.25 V DVDD, and delivers guaranteed no-missing-codes performance across its full 16-bit resolution at update rates ≤ 242 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes up to 242 Hz update rate - ensures monotonicity in high-precision closed-loop control and calibration systems. |
| RMS Noise | 40 nV at 4.17 Hz, gain = 64 - enables sub-µV-level signal resolution for strain gauge and load cell interfaces with 2.5 V reference. |
| Update Rate | 4.17 Hz to 470 Hz, software-programmable - balances noise performance and throughput: 4.17 Hz for max resolution, 470 Hz for faster process monitoring. |
| Supply Current | 300 µA typical (AVDD = 3–5 V) - supports battery-powered portable instrumentation with <1 mW total power at 3 V. |
| Input Channels | 3 differential analog inputs (AIN1, AIN2, AIN3) - allows concurrent measurement of multiple sensors without external multiplexing. |
| Common-Mode Rejection | 100 dB min at DC and 50/60 Hz - maintains accuracy in noisy industrial environments with ground offsets or EMI coupling. |
| Reference Detect | Active when REFIN < 0.3 V - provides hardware fault indication for open-reference or failed voltage reference conditions. |
Pinout & Package
AD7798BRUZ-REEL is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for compact industrial PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered for noise immunity; supports continuous or burst-mode SPI/QSPI/MICROWIRE/DSP interface up to 470 Hz data rate. |
| CS | Chip select (active low) | Enables 3-wire operation when hardwired low; serves as frame sync in multi-device daisy-chain configurations. |
| AIN3(+)/P1 | Configurable I/O | Dual-function: positive input of third differential channel OR general-purpose digital output referenced to AVDD/GND. |
| AIN3(−)/P2 | Configurable I/O | Dual-function: negative input of third differential channel OR second general-purpose digital output. |
| AIN1(+), AIN1(−) AIN2(+), AIN2(−) |
Differential analog inputs | Two dedicated differential pairs with ±VREF/gain input range; support unbuffered (gain = 1–2) or buffered/in-amp (gain = 4–128) modes. |
| REFIN(+), REFIN(−) | Reference voltage terminals | Accept external reference from 0.1 V to AVDD; internal detect asserts NOXREF if voltage drops below 0.3 V. |
| PSW | Low-side power switch | Integrated MOSFET (RON ≤ 9 Ω @ 3 V) for excitation current control in 4-wire RTD or bridge sensor biasing. |
| DOUT/RDY | Combined data output / conversion ready | Drives serial data on falling SCLK edge; asserts low to signal conversion completion - usable as interrupt to host MCU. |
| DIN | Serial data input | Loads configuration registers (mode, config, IO, offset, full-scale) and initiates calibrations via 8-bit communication register protocol. |
| AVDD, DVDD, GND | Power supplies | Separate analog (2.7–5.25 V) and digital (2.7–5.25 V) rails enable mixed-signal isolation and flexible level-shifting in system design. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip instrumentation amplifier | Programmable gain (1–128) with 40 nV rms noise at 4.17 Hz - eliminates need for external op-amp stages in microvolt-level sensor interfacing. |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-filtered via configurable sinc³ + notch architecture - removes mains interference without firmware overhead or external notch filters. |
| Burnout current sources | Internal 0.2 µA/2 µA current sources on AIN pins - enables open-wire detection in 4–20 mA loop or RTD sensor diagnostics. |
| Independent interface supply (DVDD) | Supports 2.7–5.25 V logic levels decoupled from AVDD - simplifies interfacing to 3.3 V MCUs while powering analog section from 5 V. |
| Low-side power switch (PSW) | RON ≤ 9 Ω at 3 V, 30 mA continuous rating - directly drives excitation current for 2-/3-/4-wire RTDs or half-bridge sensors without external FET. |
Applications
| Weigh Scales | Pressure Measurement |
|---|---|
|
Use Scenario: High-accuracy platform scales and tank weighing systems using 4-wire load cells with mV/V outputs. IC Role / Device Role / Timing Role: Primary ADC with integrated in-amp digitizes differential bridge signals at 4.17–16.7 Hz, rejecting line-frequency noise and enabling 20,000+ count resolution. Use Value: 40 nV rms noise at gain = 64 and 4.17 Hz allows direct digitization of 2 mV/V load cells with 2.5 V reference - eliminating external amplification and reducing component count by ≥3. |
Use Scenario: Industrial pressure transmitters with piezoresistive or capacitive sensing elements requiring ratiometric measurement. IC Role / Device Role / Timing Role: Front-end ADC acquires conditioned sensor output while PSW controls bridge excitation; reference detect monitors stable VREF for ratiometric accuracy. Use Value: Integrated low-side switch (RON ≤ 9 Ω) and burnout currents enable single-chip excitation control and open-circuit diagnostics - reducing BOM and improving field reliability. |
| Strain Gauge Transducers | Portable Instrumentation |
|
Use Scenario: Structural health monitoring nodes measuring microstrain via bonded foil or semiconductor gauges in battery-constrained deployments. IC Role / Device Role / Timing Role: Low-power ADC samples differential gauge outputs at 16.7–62 Hz; power-down mode draws ≤1 µA during sleep intervals. Use Value: 300 µA typical operating current and 1 µA max power-down current extend AA-battery life to >2 years in 1-sample-per-second logging applications. |
Use Scenario: Handheld gas analyzers or blood glucose meters requiring high-resolution analog acquisition in compact, low-power form factors. IC Role / Device Role / Timing Role: Single-chip analog front end digitizes electrochemical sensor outputs with programmable gain and simultaneous 50/60 Hz rejection. Use Value: On-chip 50/60 Hz rejection and 16-bit no-missing-codes performance eliminate need for external DSP filtering - shrinking PCB area and firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 16-bit, 3-channel, but lacks low-side power switch (PSW) and burnout currents; 27 nV noise at 4.17 Hz (gain=64). | Not suitable for RTD excitation or open-wire diagnostics; requires external switch/FET and current sources. | Select AD7792BRUZ only if PSW and burnout features are unused and lower noise is prioritized over integration. |
| ADS124S08IPWR | 24-bit, 7-channel, integrated PGA and reference; 15 nV noise at 10 SPS; no PSW; SPI-only interface. | Higher resolution and channel count, but no integrated low-side switch - unsuitable for self-contained RTD biasing. | Choose ADS124S08IPWR for ultra-high-resolution multi-sensor systems where PSW is unnecessary and 24-bit depth is critical. |
Compared with AD7792BRUZ and ADS124S08IPWR, the AD7798BRUZ-REEL uniquely combines 16-bit precision, integrated low-side power switching, burnout current sources, and simultaneous 50/60 Hz rejection - making it the optimal choice for cost-sensitive, space-constrained industrial sensor nodes requiring full analog front-end integration.
Availability
AD7798BRUZ-REEL is available at Aetrix Electronics and suitable for industrial weigh scales, pressure transmitters, and portable instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7798BRUZ-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 centers worldwide.
The AD7798 is part of Analog Devices' precision Σ-Δ ADC product line, engineered specifically for low-power, low-noise industrial and instrumentation applications where sensor signal integrity, integration density, and robustness in harsh environments are critical.
FAQ
What is the maximum update rate supported by the AD7798BRUZ-REEL?
The AD7798BRUZ-REEL supports an output update rate from 4.17 Hz to 470 Hz, selectable via the FS[3:0] bits in the mode register. At 470 Hz, the device maintains 16-bit effective resolution with gain = 1–8 and 2.5 V reference, though peak-to-peak resolution degrades to 13.5–15.5 bits depending on gain setting per Table 6 of the datasheet.
Does the AD7798BRUZ-REEL include an internal oscillator?
Yes, the AD7798BRUZ-REEL includes an internal clock oscillator operating at 64 kHz ±3%, eliminating the need for an external crystal or clock source. This oscillator drives the Σ-Δ modulator and digital filter, and its frequency is not user-adjustable.
Can the AD7798BRUZ-REEL drive excitation current for RTD sensors?
Yes - the AD7798BRUZ-REEL integrates a low-side power switch (PSW pin) with RON ≤ 9 Ω at 3 V and 30 mA continuous current rating, enabling direct excitation of 2-, 3-, or 4-wire RTDs without external discrete components.
What is the noise performance of the AD7798BRUZ-REEL at 16.7 Hz update rate?
At 16.7 Hz and gain = 64, the AD7798BRUZ-REEL delivers 85 nV rms noise (typical) with a 2.5 V reference, corresponding to 16-bit effective resolution and 16-bit peak-to-peak resolution per Table 6 of the AD7798/AD7799 Rev. B datasheet.
Is the AD7798BRUZ-REEL compatible with standard SPI interfaces?
Yes, the AD7798BRUZ-REEL supports 3-wire SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces. Its Schmitt-triggered SCLK input ensures robust timing margin, and CS can be hardwired low for simplified 3-wire operation with DIN, DOUT/RDY, and SCLK.
AD7798BRUZ-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:
- 16
- 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:
- -
AD7798BRUZ-REEL FAQ
1.How can I place an order for AD7798BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7798BRUZ-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 AD7798BRUZ-REEL reliable?
The price and inventory of AD7798BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7798BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7798BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7798BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7798BRUZ-REEL?
AD7798BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7798BRUZ-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 AD7798BRUZ-REEL?
For technical support, including AD7798BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7798BRUZ-REEL requirements.
6.How does Aetrix verify that AD7798BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7798BRUZ-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 AD7798BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7798BRUZ-REEL?
All AD7798BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7798BRUZ-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 AD7798BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7798BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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