AD7719BRUZ-REEL - 24-Bit Dual Sigma-Delta ADC | Analog Devices
MPN: AD7719BRUZ-REEL ✓ פעילAD7719BRUZ-REEL סקירה
A sigma-delta ADC is a noise-shaping converter that trades speed for very high resolution by oversampling the input and pushing quantization noise out of the baseband; the AD7719's chopping scheme repeatedly reverses the entire signal chain to cancel dc offset and offset drift, which is essential in low-frequency precision measurement applications such as weigh scales, RTD/thermocouple temperature acquisition, and strain-gauge pressure transducers. This dual-channel, dual-resolution architecture places the AD7719 in the broader category of precision data acquisition ICs, between simple SAR ADCs and high-speed pipeline converters.
Key features include 24-bit main-channel resolution with 0.0015% integral nonlinearity, a PGA gain range of 1 to 128, on-chip digital filtering, and a low quiescent current of typically 2 mA from a single 3 V or 5 V analog supply. The 28-TSSOP package exposes all digital I/O, SPI/QSPI/MICROWIRE-compatible serial interface, and dual excitation current sources for RTD bridges, while a chop-stabilized architecture provides excellent EMI rejection and DC drift performance.
The AD7719BRUZ-REEL uses Analog Devices' patented chopping technique in which the analog input is alternately inverted and re-converted, then digitally de-chopped, removing first-order offset and 1/f noise; this delivers an effective offset drift of a few nV/°C and makes the part well suited to industrial environments with thermal cycling. The device supports both 3 V and 5 V operation with a digital interface that is directly compatible with microcontrollers and DSPs.
Typical applications include weigh scales, RTD and thermocouple temperature measurement, pressure and strain-gauge transducer front-ends, 4-20 mA loop-powered transmitters, and portable industrial instrumentation. Its integrated excitation sources and low-side switches eliminate the need for external signal conditioning on many bridges. When designing, ensure adequate input common-mode bypassing and observe the maximum analog input range of ±2.56 V at the lowest PGA gain to avoid saturation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור AD7719BRUZ-REEL — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם AD7719BRUZ-REEL (אותו גורם צורה וטביעת רגל) — שונים ב Package, Input Type, Operating Temperature, Resolution, RoHS Status.
AD7719BRUZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD7719BRUZ-REEL7
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD7719BRUZ-REEL
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD7719BRU-REEL
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD7190BRUZ
✅ Drop-In✗ אזל מהמלאי
$7.6364 / יחידה
הצג גיליון נתונים ←AD7799BRUZ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD7719BRUZ-REEL דירוגים מרביים ומאפיינים חשמליים
| Manufacturer | Analog Devices |
| MPN | AD7719BRUZ-REEL |
| פונקציה | Dual Sigma-Delta ADC with PGA, excitation sources, and temperature sensor |
| Resolution (Main ADC) | 24-bit |
| Resolution (Auxiliary ADC) | 16-bit |
| Number of Input Channels | 3 or 6 differential/pseudo-differential inputs |
| ADC Architecture | Sigma-Delta with chopping |
| טווח מתח כניסה | ±2.56 V (bipolar, with PGA); 0 to VREF (unipolar) |
| PGA Gain Range | 1 to 128 |
| מתח אספקה | 3 V to 5.25 V (single supply) |
| זרם מנוחה | 2 mA typical |
| Excitation Current Sources | Matched switchable on-chip current sources |
| Digital I/O | 4-bit GPIO port |
| ממשק | SPI/QSPI/MICROWIRE-compatible serial |
| טמפרטורת פעולה | -40 °C to +85 °C (industrial) |
| מארז | 28-TSSOP (MS-153AE) |
| סוג הרכבה | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| סטטוס RoHS | Compliant (Z suffix indicates lead-free) |
תצורת פינים של AD7719BRUZ-REEL
| פין 1 | SCLK — Serial clock input (SPI) |
| פין 2 | DOUT — Serial data output |
| פין 3 | RDIN — Serial data input (read/write) |
| פין 4 | CS — Chip select, active low |
| פין 5 | DGND — Digital ground |
| פין 6 | DVDD — Digital supply voltage |
| פין 7 | IO0 — General-purpose digital I/O 0 |
| פין 8 | IO1 — General-purpose digital I/O 1 |
| פין 9 | IO2 — General-purpose digital I/O 2 |
| פין 10 | IO3 — General-purpose digital I/O 3 |
| פין 11 | IOUT1 — Switchable excitation current source 1 |
| פין 12 | IOUT2 — Switchable excitation current source 2 |
| פין 13 | SW1 — Low-side power switch 1 |
| פין 14 | SW2 — Low-side power switch 2 |
| פין 15 | AGND — Analog ground |
| פין 16 | AVDD — Analog supply voltage |
| פין 17 | REF IN+ — Positive reference input |
| פין 18 | REF IN- — Negative reference input |
| פין 19 | AIN1 — Analog input 1 (main ADC) |
| פין 20 | AIN2 — Analog input 2 (main ADC) |
| פין 21 | AIN3 — Analog input 3 (main ADC) |
| פין 22 | AIN4 — Analog input 4 (aux 16-bit ADC) |
| פין 23 | AIN5 — Analog input 5 (aux 16-bit ADC) |
| פין 24 | AIN6 — Analog input 6 (aux 16-bit ADC) |
| פין 25 | NC — Not connected |
| פין 26 | NC — Not connected |
| פין 27 | RESET — Hardware reset, active low |
| פין 28 | MODE — Mode select for interface / power-down |
יישומים טיפוסיים
AD7719BRUZ-REEL מתאים עבור 6 יישוםs: Weigh Scales & Load Cell Measurement, RTD & Thermocouple Temperature Measurement, Pressure Transducer Front-End, 4-20 mA Loop-Powered Transmitters, Portable Industrial Instrumentation, Industrial Process Control PLCs.
Weigh Scales & Load Cell Measurement
The AD7719's 24-bit main ADC with PGA gain 1-128 directly digitizes strain-gauge bridge outputs, while the integrated matched excitation current sources eliminate the need for an external reference regulator. The chopping architecture holds offset drift to a few nV/°C, which is critical for weigh-scale zero-point stability over industrial temperature swings. The 16-bit auxiliary ADC can simultaneously digitize the load-cell temperature for built-in drift compensation, eliminating an external temperature-sensor ADC.
מומלץ
RTD & Thermocouple Temperature Measurement
The AD7719 digitizes RTD bridge signals with 24-bit resolution, and the on-chip excitation current sources drive the RTD directly, saving external circuitry. Cold-junction compensation is handled via the auxiliary 16-bit ADC connected to a separate temperature sensor. The chopping scheme rejects 1/f noise that would otherwise dominate low-rate temperature measurements, delivering micro-Kelvin-class repeatability in process-control loops.
מומלץ
Pressure Transducer Front-End
Differential pressure transducers typically output millivolt-level signals at low frequency; the AD7719's PGA gains up to 128 amplify these small signals directly into the 24-bit ADC, while the chopping scheme eliminates offset and drift. The auxiliary 16-bit channel can monitor a separate pressure port or the bridge supply voltage for ratiometric compensation, and the low-side power switches disconnect the bridge during sleep for power-critical portable applications.
מומלץ
4-20 mA Loop-Powered Transmitters
The AD7719's 2 mA quiescent current leaves ample budget for the 4 mA zero-current headroom in a 4-20 mA loop, even after the loop-sensing shunt. Its single 3 V to 5.25 V supply operation matches the loop voltage after a simple series regulator. The integrated current sources can power a remote RTD or bridge sensor directly, eliminating auxiliary power rails in field-mounted transmitters.
מומלץ
Portable Industrial Instrumentation
Battery-powered handheld instruments benefit from the AD7719's 2 mA quiescent current, software-configurable PGA, and integrated excitation sources, which together minimize the bill of materials. The chopping scheme provides robust EMI rejection for operation near motors and switching power supplies on factory floors. The TSSOP-28 footprint keeps the analog front-end small enough for handheld form factors.
מומלץ
Industrial Process Control PLCs
The AD7719's multi-channel input capability (up to 6 inputs) and integrated digital I/O port allow a single chip to digitize multiple sensor types per PLC analog card slot, reducing card density and cost. The chopping scheme delivers the EMI rejection required by IEC 61000-4 industrial EMC standards. SPI/QSPI/MICROWIRE-compatible serial interface drops directly into common PLC backplane microcontrollers.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AD7719BRUZ-REEL — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | AD7719BRUZ | AD7719BRUZ-REEL7 | AD7719BRU-REEL | AD7190BRUZ | AD7799BRUZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same |
| Main ADC Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Auxiliary ADC | 16-bit included | 16-bit included | 16-bit included | 16-bit included | None | None |
| PGA Gain Range | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 |
| Excitation Current Sources | 2 matched on-chip | 2 matched on-chip | 2 matched on-chip | 2 matched on-chip | None | None |
| Supply Voltage | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 2.7 V to 5.25 V |
| Quiescent Current | 2 mA typical | 2 mA typical | 2 mA typical | 2 mA typical | 3.5 mA typical | 0.65 mA typical |
| RoHS Compliance | Yes (Z suffix) | Yes (Z suffix) | Yes (Z suffix) | No (SnPb finish) | Yes (Z suffix) | Yes (Z suffix) |
מבדילים עיקריים
- Dual-channel architecture with integrated excitation sources (לעומתAD7190BRUZ)
- Higher feature integration than newer AD7799 (לעומתAD7799BRUZ)
- Chopping scheme delivers best-in-class offset drift (לעומתAD7799BRUZ)
הערות תכנון
Place 100 nF ceramic bypass capacitors directly at AVDD and DVDD pins with short traces to AGND/DGND planes respectively. Keep analog and digital grounds separate and join at a single point near the AD7719. Use a low-ESR 10 µF tantalum or ceramic bulk capacitor at the supply input to handle the excitation current source switching transients.
Route the analog input traces as matched impedance differential pairs and keep them short and guarded by AGND. The REF IN+/REF IN- traces should also be routed as a guarded differential pair to minimize common-mode noise pickup, which directly degrades the ADC's CMRR and 24-bit noise floor. The TSSOP-28 thermal pad is not connected on the AD7719 (no exposed pad) - follow JEDEC MS-153AE land pattern precisely.
Do not exceed the input common-mode range (AGND + 0.5 V to AVDD - 0.5 V) when using high PGA gains - common-mode violation at gain = 128 will saturate the ADC and produce nonsense readings. The chopping scheme only rejects 1/f noise and offset; high-frequency EMI above the chop frequency still passes through, so add ferrite beads on cable harnesses for industrial installations. Estimated: at gain 128, the input span shrinks to ±20 mV, so any 5 mV common-mode noise consumes 25% of dynamic range.
מידע על תאימות
RoHS compliant per Analog Devices product page (Z suffix = lead-free). Industrial grade -40 to +85 °C. Not AEC-Q100 qualified - this is not an automotive grade part.
