AD7719BRUZ-REEL - 24-Bit Dual Sigma-Delta ADC | Analog Devices
MPN: AD7719BRUZ-REEL ✓ Hoạt độngAD7719BRUZ-REEL Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7719BRUZ-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7719BRUZ-REEL (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Operating Temperature, Resolution, RoHS Status.
AD7719BRUZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7719BRUZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7719BRUZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7719BRU-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7190BRUZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7799BRUZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7719BRUZ-REEL Tỷ lệ tối đa & tính chất điện
| Manufacturer | Analog Devices |
| MPN | AD7719BRUZ-REEL |
| Chức năng | 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 |
| Phạm vi điện áp đầu vào | ±2.56 V (bipolar, with PGA); 0 to VREF (unipolar) |
| PGA Gain Range | 1 to 128 |
| Điện áp cung cấp | 3 V to 5.25 V (single supply) |
| Điện áp yên tĩnh | 2 mA typical |
| Excitation Current Sources | Matched switchable on-chip current sources |
| Digital I/O | 4-bit GPIO port |
| Giao diện | SPI/QSPI/MICROWIRE-compatible serial |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Hộp | 28-TSSOP (MS-153AE) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| Trạng thái RoHS | Compliant (Z suffix indicates lead-free) |
Cấu hình chân AD7719BRUZ-REEL
| Chân 1 | SCLK — Serial clock input (SPI) |
| Chân 2 | DOUT — Serial data output |
| Chân 3 | RDIN — Serial data input (read/write) |
| Chân 4 | CS — Chip select, active low |
| Chân 5 | DGND — Digital ground |
| Chân 6 | DVDD — Digital supply voltage |
| Chân 7 | IO0 — General-purpose digital I/O 0 |
| Chân 8 | IO1 — General-purpose digital I/O 1 |
| Chân 9 | IO2 — General-purpose digital I/O 2 |
| Chân 10 | IO3 — General-purpose digital I/O 3 |
| Chân 11 | IOUT1 — Switchable excitation current source 1 |
| Chân 12 | IOUT2 — Switchable excitation current source 2 |
| Chân 13 | SW1 — Low-side power switch 1 |
| Chân 14 | SW2 — Low-side power switch 2 |
| Chân 15 | AGND — Analog ground |
| Chân 16 | AVDD — Analog supply voltage |
| Chân 17 | REF IN+ — Positive reference input |
| Chân 18 | REF IN- — Negative reference input |
| Chân 19 | AIN1 — Analog input 1 (main ADC) |
| Chân 20 | AIN2 — Analog input 2 (main ADC) |
| Chân 21 | AIN3 — Analog input 3 (main ADC) |
| Chân 22 | AIN4 — Analog input 4 (aux 16-bit ADC) |
| Chân 23 | AIN5 — Analog input 5 (aux 16-bit ADC) |
| Chân 24 | AIN6 — Analog input 6 (aux 16-bit ADC) |
| Chân 25 | NC — Not connected |
| Chân 26 | NC — Not connected |
| Chân 27 | RESET — Hardware reset, active low |
| Chân 28 | MODE — Mode select for interface / power-down |
Ứng dụng tiêu biểu
AD7719BRUZ-REEL phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7719BRUZ-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Dual-channel architecture with integrated excitation sources (vsAD7190BRUZ)
- Higher feature integration than newer AD7799 (vsAD7799BRUZ)
- Chopping scheme delivers best-in-class offset drift (vsAD7799BRUZ)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
