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Analog Devices Inc. AD7719BR-REEL
- Part No.:
- AD7719BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7719BR-REEL.pdf
- Description:
- IC ADC 16/24BIT SIG-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
AD7719BR-REEL from Analog Devices is a factory-calibrated, dual-channel sigma-delta ADC with 24-bit main and 16-bit auxiliary channels, integrated PGA, excitation current sources (200 µA), low-side power switches, and on-chip temperature sensor - designed for high-precision sensor front ends in weigh scales and RTD-based temperature systems operating at 3 V or 5 V.
For engineers reviewing the AD7719BR-REEL datasheet, AD7719BR-REEL pinout, AD7719BR-REEL application, or AD7719BR-REEL equivalent, key selection criteria include simultaneous 50/60 Hz rejection at 20 Hz update rate, ±13-bit p-p resolution at ±20 mV input range, rail-to-rail buffered analog inputs, and SPI-compatible 3-wire serial interface with Schmitt-triggered SCLK.
Technical Context
The AD7719BR-REEL integrates two independent Σ-Δ ADCs sharing a 32.768 kHz crystal oscillator and on-chip PLL, enabling synchronized sampling and conversion of two signal sources. Its main channel supports fully differential, unipolar, or bipolar inputs from ±1.024 × REFIN1/128 to ±1.024 × REFIN1, while the auxiliary channel accepts ±REFIN2 or ±REFIN2/2 with dedicated reference input REFIN2.
On-chip functions include switchable matched 200 µA excitation current sources (IEXC1/IEXC2), low-side power switches (SW1/SW2, RON ≤ 7 Ω @ 3 V), 4-bit digital I/O port referenced to AVDD/AGND, and reference detect circuitry that asserts NOXREF when REFIN1 falls below 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Main ADC resolution | 24-bit no missing codes at 20 Hz update rate - guarantees monotonicity for precision weighing and pressure transducers. |
| Auxiliary ADC resolution | 16-bit no missing codes at 20 Hz - sufficient for secondary sensing (e.g., cold-junction compensation) without external digitization. |
| Peak-to-peak resolution | 13-bit p-p @ ±20 mV / 20 Hz; 18-bit p-p @ ±2.56 V / 20 Hz - enables direct transducer interfacing without gain staging. |
| Power consumption | 1.5 mA typ @ 3 V (both ADCs enabled); 10 µA in power-down mode with 32 kHz crystal running - suitable for battery-powered instrumentation. |
| AC rejection | 100 dB min @ 50 Hz and 60 Hz simultaneously at 20 Hz update rate - eliminates mains interference in industrial sensor nodes. |
| Excitation current accuracy | 200 µA ±10% initial tolerance, ±1% matching between IEXC1/IEXC2 - ensures matched bridge excitation for 3-/4-wire RTDs. |
| Input voltage range | ±1.024 × REFIN1/GAIN (GAIN = 1–128); REFIN1 = 1 V to AVDD - supports flexible reference scaling for varying sensor sensitivities. |
Pinout & Package
AD7719BR-REEL is housed in a 28-lead SOIC package (R-28), with exposed pad not electrically connected. Pin assignments are validated per Analog Devices AD7719 Rev. A datasheet Figure 9 (Pin Configuration) and Table on page 9 (Pin Function Descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1, AIN2 | Main channel dedicated analog inputs | Differential pair for primary sensor (e.g., load cell); support buffered/unbuffered operation with rail-to-rail input range. |
| AIN3, AIN4 | Multiplexed analog inputs | Configurable to main or auxiliary channel - enables flexible signal routing (e.g., backup sensor or diagnostics). |
| AIN5, AIN6 | Auxiliary channel dedicated inputs | Support pseudodifferential (AIN5 vs AGND) or fully differential (AIN5 vs AIN6) modes - ideal for RTD or thermistor measurement. |
| IOUT1, IOUT2 | Excitation current outputs | Switchable 200 µA current sources - drive Wheatstone bridges or 2-/3-wire RTDs with matched output compliance (AVDD – 0.6 V). |
| P1/SW1, P2/SW2 | Low-side power switches | RON ≤ 7 Ω @ 3 V, 20 mA continuous rating - control sensor excitation sequencing or power gating in smart transmitters. |
| REFIN1(+), REFIN1(–) | Main ADC reference inputs | Differential reference input with 1 V to AVDD range - allows ratiometric measurement with bridge sensors using same supply. |
| REFIN2 | Auxiliary ADC reference input | Single-ended reference (1 V to AVDD) - decouples auxiliary channel from main reference for independent calibration. |
| DIN, DOUT, SCLK, CS, RDY | 3-wire SPI-compatible serial interface | Schmitt-triggered SCLK enables noise immunity; RDY indicates data-ready status; CS optional for microcontroller/DSP interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Factory calibration | Eliminates need for field zero/full-scale calibration - reduces production test time and BOM cost for portable instrumentation. |
| Simultaneous 50/60 Hz rejection | 100 dB rejection at 20 Hz update rate without external notch filters - simplifies EMI filtering in global deployments. |
| Integrated excitation & switching | Matched 200 µA current sources + low-RON switches enable complete 3-wire RTD solution in single IC - saves PCB area and layout complexity. |
| Rail-to-rail buffered input | Supports ±20 mV to ±2.56 V input ranges with 13–18 bit p-p resolution - accommodates wide variety of sensor outputs without external op-amps. |
| On-chip temperature sensor | Monitors die temperature for drift compensation in high-stability applications like laboratory-grade weigh scales. |
Applications
| Pressure Measurement | Temperature Measurement |
|---|---|
Use Scenario: High-accuracy industrial pressure transmitter with 4–20 mA loop output and local digital display. IC Role / Device Role / Timing Role: Dual-channel ADC acquires bridge pressure sensor (main channel) and RTD cold-junction reference (aux channel) simultaneously. Use Value: Factory-calibrated 24-bit main channel delivers <±10 ppm FSR INL; matched excitation currents ensure stable ratiometric measurement across temperature. |
Use Scenario: Precision RTD-based temperature controller for HVAC or medical equipment requiring ±0.1°C accuracy. IC Role / Device Role / Timing Role: Main ADC measures 3-wire Pt100 RTD; auxiliary ADC monitors reference junction or supply voltage. Use Value: 13-bit p-p resolution at ±20 mV enables sub-0.05°C quantization step; simultaneous sampling eliminates inter-channel timing errors. |
| Weigh Scales | 4–20 mA Transmitters |
Use Scenario: Battery-powered portable weigh scale with auto-zero, tare, and overload detection. IC Role / Device Role / Timing Role: Main ADC digitizes load cell output; on-chip temperature sensor compensates for thermal drift. Use Value: 18-bit p-p resolution at ±2.56 V supports >100,000-count displays; 10 µA power-down mode extends battery life. |
Use Scenario: Smart 2-wire 4–20 mA transmitter with HART communication and diagnostics. IC Role / Device Role / Timing Role: ADC digitizes process variable (e.g., flow, level); I/O port controls HART modem enable and sensor excitation. Use Value: Integrated 4-bit I/O port and low-side switches reduce external logic; 3-wire interface simplifies microcontroller integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7190BRUZ | 24-bit single-channel Σ-Δ ADC with higher resolution (24-bit no missing codes up to 4.8 kHz), no auxiliary ADC, no integrated excitation sources. | Requires external excitation and multiplexing for dual-sensor systems; better suited for high-speed single-sensor applications. | Select AD7190BRUZ when only one high-resolution channel is needed and external excitation is acceptable. |
| ADS1248IPWR | 24-bit single-channel Σ-Δ ADC with integrated PGA, burnout current, and 4-channel mux; no factory calibration, no excitation current sources. | Lacks matched 200 µA excitation and low-side switches - unsuitable for direct 3-wire RTD or bridge sensor interfaces without external components. | Select ADS1248IPWR when system-level calibration is feasible and discrete excitation circuitry is already present. |
Compared with AD7719BR-REEL, AD7190BRUZ offers higher speed but lacks dual-channel synchronization and integrated excitation, while ADS1248IPWR provides more input flexibility but requires full system calibration and external current sources - making AD7719BR-REEL uniquely suited for factory-calibrated, self-contained sensor front ends.
Availability
AD7719BR-REEL 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 calibration retention, and minimal external circuitry.
Supply support for AD7719BR-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with over 50 years of innovation in precision data conversion and sensor interface technology.
The AD7719BR-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency, high-accuracy sensor measurement applications where factory calibration, integrated excitation, and dual-channel synchronization reduce system design complexity.
FAQ
What is the maximum update rate of the AD7719BR-REEL main ADC?
The AD7719BR-REEL main ADC supports an output update rate from 5.4 Hz to 105 Hz in 0.732 ms increments. At 20 Hz update rate, it achieves 13-bit peak-to-peak resolution for ±20 mV input range and 18-bit p-p resolution for ±2.56 V range - critical for balancing noise performance and response time in industrial sensors.
Does the AD7719BR-REEL require external calibration during system operation?
No, the AD7719BR-REEL is factory-calibrated at 25°C with AVDD = DVDD = 4 V and REFIN1 = 2.5 V. System zero or full-scale calibration can be performed if operating conditions differ significantly, but field calibration is not required - reducing production test overhead and improving long-term stability in AD7719BR-REEL-based designs.
How does the AD7719BR-REEL handle 50 Hz and 60 Hz interference simultaneously?
The AD7719BR-REEL achieves simultaneous 50 Hz and 60 Hz rejection using a 19.8 Hz update rate (SF = 69), delivering ≥60 dB normal-mode rejection. At its standard 20 Hz update rate, it provides ≥100 dB rejection at both frequencies - eliminating need for external notch filters in global instrumentation deployed across 50/60 Hz power grids.
What are the voltage limits for analog inputs on the AD7719BR-REEL?
In buffered mode (BUF = 0), AD7719BR-REEL analog inputs must remain within AGND + 100 mV to AVDD – 100 mV. In unbuffered mode (BUF = 1), the range expands to AGND – 30 mV to AVDD + 30 mV - enabling true rail-to-rail operation but requiring careful attention to input overvoltage protection in noisy environments.
Can the AD7719BR-REEL operate from a single 3 V supply?
Yes, the AD7719BR-REEL is fully specified for single 3 V operation (AVDD and DVDD = 2.7 V to 3.6 V). Power dissipation is 4.5 mW with both ADCs enabled and 2.85 mW with only the main ADC active in unbuffered mode - making it suitable for portable and battery-powered applications where low quiescent current is essential.
AD7719BR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
AD7719BR-REEL FAQ
1.How can I place an order for AD7719BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7719BR-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 AD7719BR-REEL reliable?
The price and inventory of AD7719BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7719BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7719BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7719BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7719BR-REEL?
AD7719BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7719BR-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 AD7719BR-REEL?
For technical support, including AD7719BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7719BR-REEL requirements.
6.How does Aetrix verify that AD7719BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7719BR-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 AD7719BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7719BR-REEL?
All AD7719BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7719BR-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 AD7719BR-REEL part is unused and in its original packaging.
Return procedure for AD7719BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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