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Analog Devices Inc. AD7719BRUZ
- Part No.:
- AD7719BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7719BRUZ.pdf
- Description:
- IC ADC 16/24B SIG-DELTA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
AD7719BRUZ from Analog Devices is a factory-calibrated, dual-channel Σ-Δ analog front-end IC integrating a 24-bit main ADC and 16-bit auxiliary ADC, programmable gain amplifier (PGA), dual 200 µA excitation current sources, low-side power switches, on-chip temperature sensor, and 4-bit digital I/O port. It operates from single 3 V or 5 V supply, delivers simultaneous 50/60 Hz rejection at 20 Hz update rate, and targets precision sensor measurement in portable instrumentation and industrial transmitters.
For engineers reviewing the AD7719BRUZ datasheet, AD7719BRUZ pinout, AD7719BRUZ application, or AD7719BRUZ equivalent, key selection criteria include its dual-channel resolution (24-/16-bit), simultaneous sampling capability, rail-to-rail input buffer with PGA, 3-wire SPI-compatible interface, and integrated excitation/switching for RTD/bridge sensors - all in a 28-lead TSSOP package.
Technical Context
The AD7719BRUZ implements two independent Σ-Δ modulators with separate reference inputs (REFIN1 for main channel, REFIN2 for auxiliary), enabling simultaneous conversion of differential signals without crosstalk. Its on-chip PLL synchronizes to a 32.768 kHz crystal to generate internal clocks, supporting software-programmable output data rates from 5.4 Hz to 105 Hz in 0.732 ms increments.
It features switchable excitation current routing (IEXC1/IEXC2 → IOUT1/IOUT2), low-side power switches (SW1/SW2, RON ≤ 7 Ω @ 3 V), and a reference detect circuit monitoring REFIN1 voltage (active below 0.3 V). The device supports unipolar/bipolar input configurations, burnout current detection, and system-level calibration via dedicated offset/gain registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Main ADC Resolution | 24-bit no missing codes at 20 Hz update rate - ensures full dynamic range utilization for high-precision DC measurements. |
| Auxiliary ADC Resolution | 16-bit no missing codes at 20 Hz - provides synchronized secondary channel for reference or diagnostic sensing. |
| Peak-to-Peak Resolution | 18 bits @ ±2.56 V range, 20 Hz - enables 13.1 µV effective resolution for bridge sensor outputs. |
| Excitation Current | 200 µA ±10% initial tolerance, matched within ±1% - supports accurate 3-/4-wire RTD measurements without external current sources. |
| Power Consumption | 1.5 mA typical @ 3 V (both ADCs enabled) - enables battery-powered operation in portable instrumentation. |
| Common-Mode Rejection | 110 dB typ @ DC, ±2.56 V range - suppresses ground loop noise in industrial sensor interfaces. |
| Simultaneous 50/60 Hz Rejection | 100 dB min at 20 Hz update rate - eliminates mains interference without external notch filters. |
Pinout & Package
AD7719BRUZ is housed in a 28-lead TSSOP package (RU-28), thermally characterized with θJA = 97.9°C/W and θJC = 14°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOUT1 / IOUT2 | Excitation current outputs | Route internal 200 µA current sources to external RTD/bridge sensors; support 3-/4-wire configurations. |
| P1/SW1 / P2/SW2 | Low-side power switches | Enable/disable sensor excitation paths with RON ≤ 7 Ω @ 3 V; eliminate need for discrete MOSFETs. |
| AIN1–AIN6 | Analog input terminals | Support fully differential (AIN1/AIN2, AIN5/AIN6), pseudodifferential, and multiplexed inputs across both ADC channels. |
| REFIN1(+)/(–) | Main ADC reference inputs | Accept 1 V to AVDD differential reference; enable ratiometric measurement with bridge sensors. |
| REFIN2 | Auxiliary ADC reference input | Single-ended 1 V to AVDD reference; decouples auxiliary channel from main reference path. |
| DIN / DOUT / SCLK / CS / RDY | 3-wire serial interface | SPI/QSPI/MICROWIRE-compatible; Schmitt-triggered SCLK enables robust noise immunity in industrial environments. |
| P3 / P4 | General-purpose I/O | 4-bit digital port referenced to AVDD/AGND; usable for sensor enable, LED control, or status signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated dual ADCs | Eliminates field calibration requirement; maintains ±10 ppm INL and ±10 µV full-scale error over –40°C to +85°C. |
| Simultaneous sampling & conversion | Enables true time-aligned acquisition of primary and reference sensor signals - critical for drift compensation. |
| Integrated excitation & switching | Reduces BOM count by replacing two 200 µA current sources, two low-RON switches, and associated control logic. |
| Rail-to-rail input buffer with PGA | Accepts ±1.024 × REFIN1/128 to ±1.024 × REFIN1 input ranges; allows direct connection of mV-range transducer outputs. |
| On-chip temperature sensor | Provides local die temperature reading (±2°C typical) for thermal drift correction of sensor measurements. |
Applications
| Pressure Measurement | Temperature Measurement |
|---|---|
Use Scenario: High-accuracy pressure sensing in HVAC transmitters using silicon piezoresistive bridges. IC Role / Device Role / Timing Role: Dual-channel ADC acquires bridge output (main channel) and reference resistor (aux channel) simultaneously for ratiometric correction. Use Value: 18-bit p-p resolution at 20 Hz enables <1 Pa pressure resolution; integrated 200 µA excitation eliminates external current source errors. |
Use Scenario: 3-wire RTD-based temperature monitoring in industrial process control cabinets. IC Role / Device Role / Timing Role: Main ADC measures RTD voltage with switched excitation; auxiliary ADC monitors lead resistance or cold-junction reference. Use Value: Matched 200 µA current sources and low-side switches enable 0.1°C accuracy; simultaneous sampling removes timing-induced mismatch errors. |
| Weigh Scales | 4–20 mA Transmitters |
Use Scenario: Battery-powered portable weigh scales using load cell arrays with low-noise signal conditioning. IC Role / Device Role / Timing Role: Main ADC digitizes load cell output; auxiliary ADC monitors internal temperature sensor for real-time gain/offset compensation. Use Value: 24-bit no-missing-codes resolution ensures 1:1,000,000 dynamic range; 1.5 mA @ 3 V extends battery life beyond 1 year. |
Use Scenario: Smart 4–20 mA loop-powered transmitters for remote pressure/temperature sensors. IC Role / Device Role / Timing Role: ADC digitizes sensor output; I/O port controls HART modem enable; low-power modes reduce loop current during sleep. Use Value: Power-down mode draws only 10 µA with 32 kHz oscillator active - preserves loop integrity while minimizing quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7124-4BRUZ | 4-channel, 24-bit Σ-Δ ADC with PGA, but no integrated excitation sources or low-side switches. | Requires external current sources and switches for RTD/bridge sensors; better suited for multi-sensor systems without excitation needs. | Select AD7124-4BRUZ when >2 channels or higher channel density is required, and excitation circuitry is already present. |
| ADS124S08IPBS | 24-bit single-channel ADC with integrated 10 µA/100 µA/1 mA excitation, but no auxiliary ADC or temperature sensor. | Lacks simultaneous dual-channel acquisition; optimized for single high-precision sensor with flexible excitation scaling. | Select ADS124S08IPBS for cost-sensitive single-sensor designs requiring programmable excitation current levels beyond 200 µA. |
Compared with AD7719BRUZ, AD7124-4BRUZ offers greater channel count but requires external excitation components, while ADS124S08IPBS provides finer excitation granularity but sacrifices dual-channel synchronization and on-chip temperature sensing - making AD7719BRUZ uniquely suited for compact, self-contained dual-sensor measurement systems.
Availability
AD7719BRUZ is available at Aetrix Electronics and suitable for pressure measurement, temperature measurement, weigh scales, and 4–20 mA transmitters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7719BRUZ 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.
The AD7719BRUZ belongs to Analog Devices' precision Σ-Δ ADC product line, designed specifically for low-frequency, high-resolution sensor front-ends in industrial, instrumentation, and process control applications.
FAQ
What is the maximum update rate supported by the AD7719BRUZ?
The AD7719BRUZ supports an output update rate from 5.4 Hz to 105 Hz in 0.732 ms increments. At the maximum rate of 105 Hz, the main ADC maintains 16-bit peak-to-peak resolution, while the auxiliary ADC retains 16-bit no-missing-codes performance. This range enables trade-offs between noise performance and response time for different sensor types.
Does the AD7719BRUZ require external calibration?
No, the AD7719BRUZ is factory-calibrated for both main and auxiliary ADC channels, eliminating the need for field calibration. System zero and full-scale calibrations can further reduce offset and gain errors to noise-limited levels, but the device operates within published specifications (e.g., ±10 ppm INL, ±10 µV full-scale error) immediately after power-up.
How does the AD7719BRUZ handle 50 Hz and 60 Hz interference?
The AD7719BRUZ achieves simultaneous 50 Hz and 60 Hz rejection through programmable filter settings - delivering ≥100 dB rejection at 20 Hz update rate using SF = 68. This is implemented in hardware via its Σ-Δ modulator and digital filter architecture, requiring no external notch filters or software post-processing.
Can the AD7719BRUZ drive RTD sensors directly?
Yes, the AD7719BRUZ integrates two matched 200 µA excitation current sources (IEXC1/IEXC2), low-side power switches (SW1/SW2), and configurable analog inputs - enabling direct 2-, 3-, or 4-wire RTD interfacing without external components. The current matching (±1% at 25°C) and drift tracking ensure high-accuracy temperature measurement.
What package options are available for the AD7719BRUZ?
The AD7719BRUZ is available exclusively in a 28-lead TSSOP package (RU-28), measuring 4.4 mm × 9.7 mm × 1.1 mm. This RoHS-compliant package offers improved thermal performance over SOIC for space-constrained industrial modules and portable instrumentation where board area is limited.
AD7719BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16, 24
- Sampling Rate (Per Second):
- 105
- Number of Inputs:
- 3, 6
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 2
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- PGA, Simultaneous Sampling, Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7719BRUZ FAQ
1.How can I place an order for AD7719BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7719BRUZ 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 AD7719BRUZ reliable?
The price and inventory of AD7719BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7719BRUZ is usually 5 days.
3.What payment methods are accepted for AD7719BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7719BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7719BRUZ?
AD7719BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7719BRUZ 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 AD7719BRUZ?
For technical support, including AD7719BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7719BRUZ requirements.
6.How does Aetrix verify that AD7719BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7719BRUZ 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 AD7719BRUZ meets industry standards.
7.What is the process for return or replacement of AD7719BRUZ?
All AD7719BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7719BRUZ, 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 AD7719BRUZ part is unused and in its original packaging.
Return procedure for AD7719BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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