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Analog Devices Inc. AD7719BRZ
- Part No.:
- AD7719BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7719BRZ.pdf
- Description:
- IC ADC 16/24BIT SIG-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,213
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Product details
Overview
AD7719BRZ from Analog Devices is a factory-calibrated, dual-channel sigma-delta ADC with 24-bit main and 16-bit auxiliary channels, programmable gain amplifier (PGA), dual 200 µA excitation current sources, 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 front ends in weigh scales and RTD-based temperature systems.
For engineers reviewing the AD7719BRZ datasheet, AD7719BRZ pinout, AD7719BRZ application, or AD7719BRZ equivalent, key selection criteria include its dual-channel synchronized conversion, rail-to-rail buffered/unbuffered analog input support, ±13-bit p-p resolution at ±20 mV range, and integrated low-side power switches for transducer bias control - all in a 28-lead SOIC package.
Technical Context
The AD7719BRZ integrates two independent Σ-Δ modulators: a 24-bit main ADC with PGA (gain 1–128) and 16-bit auxiliary ADC, both sharing a 32.768 kHz crystal oscillator and on-chip PLL. It supports fully differential, unipolar, and bipolar input configurations with separate reference inputs (REFIN1 for main, REFIN2 for auxiliary) and simultaneous sampling of two signal sources.
On-chip functions include switchable matched 200 µA excitation sources (IEXC1/IEXC2), low-side power switches (SW1/SW2, RON ≤ 7 Ω @ 3 V), reference detect circuitry, burnout current generation, and a calibrated on-die temperature sensor. Digital interface is SPI-/QSPI-/MICROWIRE-/DSP-compatible 3-wire serial with Schmitt-triggered SCLK and RDY status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Main ADC Resolution | 24-bit no missing codes at 20 Hz update rate - ensures monotonicity for high-precision weight or pressure digitization without code gaps. |
| Auxiliary ADC Resolution | 16-bit no missing codes - provides dedicated channel for reference monitoring, temperature sensing, or secondary sensor input with guaranteed linearity. |
| Peak-to-Peak Resolution | 13-bit p-p @ ±20 mV / 20 Hz; 18-bit p-p @ ±2.56 V / 20 Hz - defines usable dynamic range for low-level bridge outputs or higher-voltage sensor signals. |
| Excitation Current Sources | 2 × 200 µA ±10% initial tolerance, ±1% matching, 200 ppm/°C drift - enables precise, matched RTD or strain gauge biasing with minimal thermal error coupling. |
| Power Consumption | 1.5 mA typ @ 3 V (both ADCs active); 10 µA max in power-down mode with 32 kHz oscillator running - supports battery-powered portable instrumentation. |
| Normal-Mode Rejection | 100 dB min @ 50/60 Hz - achieves simultaneous mains interference rejection without external notch filters or software post-processing. |
| Input Voltage Range | ±1.024 × REFIN1/GAIN (main), ±REFIN2 or ±REFIN2/2 (aux) - allows direct connection of transducers with full-scale ranges from 20 mV to 2.56 V without external amplification. |
Pinout & Package
The AD7719BRZ is housed in a 28-lead SOIC (R-28) package with exposed pad thermal enhancement. Pin assignments are validated per Analog Devices datasheet Rev. A, Figure 9 (PIN CONFIGURATION) and Table on page 9 (PIN FUNCTION DESCRIPTIONS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN4 | Main channel analog inputs | AIN1/AIN2 dedicated to main ADC; AIN3/AIN4 multiplexable between main and auxiliary channels - supports flexible sensor routing and redundancy. |
| AIN5/AIN6 | Auxiliary channel differential inputs | AIN5/AIN6 form dedicated differential pair for auxiliary ADC - enables isolated measurement of secondary sensors or reference voltages. |
| REFIN1(+)/(–) | Main ADC reference inputs | Differential reference input (2.5 V nominal, 1 V to AVDD range) - sets full-scale for main ADC; supports ratiometric measurements with bridge sensors. |
| REFIN2 | Auxiliary ADC reference input | Single-ended reference (2.5 V nominal, 1 V to AVDD range) - decouples auxiliary channel scaling from main reference for independent calibration. |
| IOUT1/IOUT2 | Excitation current outputs | Switchable 200 µA current source terminals - drive RTDs or strain gauges; configurable via IOCON register for 3-/4-wire configurations. |
| P1/SW1, P2/SW2 | Low-side power switches | Integrated MOSFET switches (RON ≤ 7 Ω @ 3 V, 20 mA max) - enable controlled power cycling of transducer bridges or excitation paths. |
| P3/P4 | General-purpose I/O | 4-bit digital I/O port referenced to AVDD/AGND - used for system control, LED indicators, or discrete sensor interface without external GPIO expanders. |
| RDY | Data-ready status output | Active-low open-drain signal indicating valid data in main or auxiliary output registers - eliminates polling and synchronizes host reads. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated dual ADCs | Eliminates field calibration requirement; guarantees ±10 ppm INL (main), ±15 ppm INL (aux) and ±3 µV offset error across –40°C to +85°C. |
| Simultaneous 50/60 Hz rejection | 100 dB rejection achieved at 19.8 Hz update rate using internal filter architecture - removes mains noise without external filtering or firmware compensation. |
| Programmable gain amplifier (PGA) | Gain 1–128 with rail-to-rail input buffer - accepts ±20 mV to ±2.56 V transducer outputs directly, reducing BOM count and PCB area. |
| Integrated excitation & switching | Dual 200 µA current sources + low-side power switches - enables complete 3-/4-wire RTD or load cell interface with no external discrete components. |
| On-chip temperature sensor | Calibrated sensor with typical accuracy per TPC 5 - provides cold-junction compensation or system thermal monitoring without external ICs. |
| 3-wire SPI-compatible interface | Schmitt-triggered SCLK, RDY status, and CS frame sync support - simplifies connection to microcontrollers (e.g., 8051, 68HC11) and DSPs without level shifters. |
Applications
| Pressure Measurement | Temperature Measurement |
|---|---|
Use Scenario: High-accuracy industrial pressure transmitters using Wheatstone bridge sensors with 20–200 mV full-scale output. IC Role / Device Role / Timing Role: Primary analog front end performing ratiometric A/D conversion, excitation current sourcing, and bridge bias control. Use Value: 13-bit p-p resolution at ±20 mV range and 100 dB 50/60 Hz rejection enable <10 ppm total error over temperature without external amplifiers or filters. |
Use Scenario: 3-wire RTD-based temperature monitoring in HVAC controllers and process instrumentation. IC Role / Device Role / Timing Role: Dual-channel converter acquiring RTD voltage (main ADC) and reference resistor voltage (aux ADC) simultaneously. Use Value: Matched 200 µA excitation sources and synchronized sampling eliminate lead-wire resistance errors and improve ΔT resolution to ±0.05°C. |
| Weigh Scales | 4–20 mA Transmitters |
Use Scenario: Portable and benchtop weighing systems requiring 100,000-count resolution and battery operation. IC Role / Device Role / Timing Role: Core ADC with PGA, low-power management, and on-chip temperature sensor for zero-drift compensation. Use Value: 1.5 mA typical current @ 3 V and 10 µA power-down mode extend battery life; 24-bit no-missing-codes ensures legal-for-trade accuracy compliance. |
Use Scenario: Smart 4–20 mA loop-powered transmitters measuring flow, level, or differential pressure. IC Role / Device Role / Timing Role: Sensor interface IC providing isolated analog input conditioning, digital processing, and HART modulation support. Use Value: Integrated low-side switches and I/O port allow direct control of loop drivers; 3-wire interface minimizes isolation component count in galvanically isolated designs. |
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 |
|---|---|---|---|
| AD7190BRUZ | 24-bit dual Σ-Δ ADC, 4.7 Hz–4.8 kHz output rate, no integrated excitation sources or low-side switches | Requires external current sources and switching for RTD/bridge interfaces; better suited for high-speed or ultra-low-noise applications | Select when higher update rates (>20 Hz) or lower RMS noise (<10 nV) are required, and external excitation circuitry is acceptable. |
| ADS1248IPWR | 24-bit single-channel Σ-Δ ADC with 4-channel mux, 2× 1 mA excitation sources, no auxiliary ADC or temperature sensor | Lacks second independent ADC channel and on-die temperature sensor; excitation sources are higher-current but less matched (±0.5% vs ±1%) | Choose for cost-sensitive, single-sensor systems needing higher excitation current or simpler layout, where dual synchronized conversion is not mandatory. |
Compared with AD7719BRZ, AD7190BRUZ offers higher speed and lower noise but requires external components for transducer biasing, while ADS1248IPWR reduces BOM count for single-sensor designs but sacrifices dual-channel synchronization and integrated thermal compensation.
Availability
AD7719BRZ is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, weigh scales, and 4–20 mA transmitters requiring stable component supply, long-term manufacturability, and factory-traceable calibration performance.
Supply support for AD7719BRZ 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, with design and manufacturing expertise spanning precision data conversion, power management, and sensor signal conditioning.
The AD7719BRZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency, high-resolution sensor measurement applications including industrial automation, test equipment, and portable instrumentation.
FAQ
What is the maximum update rate supported by the AD7719BRZ for synchronized dual-channel operation?
The AD7719BRZ supports synchronized dual-channel operation at an output update rate ranging from 5.4 Hz to 105 Hz in 0.732 ms increments. At 20 Hz update rate - commonly used for simultaneous 50/60 Hz rejection - both ADCs settle in one conversion cycle, ensuring deterministic timing for real-time control loops and data logging in systems like smart transmitters and weigh scales using the AD7719BRZ.
Does the AD7719BRZ require external calibration during system integration?
No, the AD7719BRZ is factory-calibrated for offset, full-scale, and gain across temperature, eliminating the need for field calibration. System zero or full-scale calibration can further reduce residual errors, but the AD7719BRZ delivers ±10 ppm INL and ±3 µV offset error out-of-box - sufficient for most industrial sensor applications without user calibration steps.
How does the AD7719BRZ handle 50 Hz and 60 Hz interference in noisy industrial environments?
The AD7719BRZ achieves simultaneous 50 Hz and 60 Hz normal-mode rejection of ≥100 dB using its internal digital filter architecture at specific update rates (e.g., 19.8 Hz with SF = 69). This is implemented in hardware without firmware intervention, allowing the AD7719BRZ to suppress mains-borne noise in weigh scales, pressure transmitters, and RTD systems deployed globally - regardless of local grid frequency.
Can the AD7719BRZ interface directly with a 3-wire RTD configuration?
Yes, the AD7719BRZ supports 3-wire RTD measurement natively via its dual 200 µA excitation sources (IEXC1/IEXC2), low-side power switches (SW1/SW2), and flexible analog input multiplexing (AIN3/AIN4). The AD7719BRZ's matched current sources and synchronized sampling eliminate lead-resistance errors, enabling accurate ΔT measurement without external op-amps or discrete switches.
What power supply configurations are supported by the AD7719BRZ?
The AD7719BRZ operates from a single supply: AVDD = 2.7–3.6 V or 4.75–5.25 V, and DVDD = 2.7–3.6 V or 4.75–5.25 V. It supports mixed-supply operation (e.g., 3 V AVDD / 5 V DVDD) and consumes only 1.5 mA typical @ 3 V with both ADCs active. Its 10 µA power-down mode with 32.768 kHz oscillator running makes the AD7719BRZ suitable for battery-backed portable instrumentation.
AD7719BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7719BRZ FAQ
1.How can I place an order for AD7719BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7719BRZ 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 AD7719BRZ reliable?
The price and inventory of AD7719BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7719BRZ is usually 5 days.
3.What payment methods are accepted for AD7719BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7719BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7719BRZ?
AD7719BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7719BRZ 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 AD7719BRZ?
For technical support, including AD7719BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7719BRZ requirements.
6.How does Aetrix verify that AD7719BRZ is sourced from the original manufacturer or authorized distributors?
All AD7719BRZ 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 AD7719BRZ meets industry standards.
7.What is the process for return or replacement of AD7719BRZ?
All AD7719BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7719BRZ, 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 AD7719BRZ part is unused and in its original packaging.
Return procedure for AD7719BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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