AD7719BRUZ-REEL - 24-Bit Dual Sigma-Delta ADC | Analog Devices
料号： AD7719BRUZ-REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.1 | $9.10 |
| 10 | $8.2 | $82.00 |
| 100 | $7.15 | $715.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.75 | $5,750.00 |
AD7719BRUZ-REEL 概述
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.
直接替换替代料： AD7719BRUZ-REEL ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD7719BRUZ-REEL （相同外形与封装尺寸） ——差异在于 Package, Input Type, Operating Temperature, Resolution, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
AD7719BRUZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7719BRUZ-REEL7
✅ 直接替换📋 参考替代料（不在目录中）
AD7719BRUZ-REEL
✅ 直接替换✓ 有现货
$5.75 / 个
查看数据手册 →AD7719BRU-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7190BRUZ
✅ 直接替换✓ 有现货
$7.6364 / 个
查看数据手册 →AD7799BRUZ
✅ 直接替换✓ 有现货
$5.41 / 个
查看数据手册 →AD7719BRUZ-REEL 最大额定值与电气特性
| Manufacturer | Analog Devices |
| MPN | AD7719BRUZ-REEL |
| 功能 | 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 |
| 输入电压范围 | ±2.56 V (bipolar, with PGA); 0 to VREF (unipolar) |
| PGA Gain Range | 1 to 128 |
| 电源电压 | 3 V to 5.25 V (single supply) |
| 静态电流 | 2 mA typical |
| Excitation Current Sources | Matched switchable on-chip current sources |
| Digital I/O | 4-bit GPIO port |
| 接口 | SPI/QSPI/MICROWIRE-compatible serial |
| 工作温度 | -40 °C to +85 °C (industrial) |
| 封装 | 28-TSSOP (MS-153AE) |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| RoHS 状态 | Compliant (Z suffix indicates lead-free) |
AD7719BRUZ-REEL 引脚配置
| 引脚 1 | SCLK — Serial clock input (SPI) |
| 引脚 2 | DOUT — Serial data output |
| 引脚 3 | RDIN — Serial data input (read/write) |
| 引脚 4 | CS — Chip select, active low |
| 引脚 5 | DGND — Digital ground |
| 引脚 6 | DVDD — Digital supply voltage |
| 引脚 7 | IO0 — General-purpose digital I/O 0 |
| 引脚 8 | IO1 — General-purpose digital I/O 1 |
| 引脚 9 | IO2 — General-purpose digital I/O 2 |
| 引脚 10 | IO3 — General-purpose digital I/O 3 |
| 引脚 11 | IOUT1 — Switchable excitation current source 1 |
| 引脚 12 | IOUT2 — Switchable excitation current source 2 |
| 引脚 13 | SW1 — Low-side power switch 1 |
| 引脚 14 | SW2 — Low-side power switch 2 |
| 引脚 15 | AGND — Analog ground |
| 引脚 16 | AVDD — Analog supply voltage |
| 引脚 17 | REF IN+ — Positive reference input |
| 引脚 18 | REF IN- — Negative reference input |
| 引脚 19 | AIN1 — Analog input 1 (main ADC) |
| 引脚 20 | AIN2 — Analog input 2 (main ADC) |
| 引脚 21 | AIN3 — Analog input 3 (main ADC) |
| 引脚 22 | AIN4 — Analog input 4 (aux 16-bit ADC) |
| 引脚 23 | AIN5 — Analog input 5 (aux 16-bit ADC) |
| 引脚 24 | AIN6 — Analog input 6 (aux 16-bit ADC) |
| 引脚 25 | NC — Not connected |
| 引脚 26 | NC — Not connected |
| 引脚 27 | RESET — Hardware reset, active low |
| 引脚 28 | MODE — Mode select for interface / power-down |
典型应用
AD7719BRUZ-REEL 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： AD7719BRUZ-REEL ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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) |
关键差异点
- Dual-channel architecture with integrated excitation sources （对比 AD7190BRUZ)
- Higher feature integration than newer AD7799 （对比 AD7799BRUZ)
- Chopping scheme delivers best-in-class offset drift （对比 AD7799BRUZ)
设计说明
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.
合规信息
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.
