AD7714ARS-5REEL - 24-Bit Sigma-Delta ADC, 28-SSOP | Analog Devices
Référence : AD7714ARS-5REEL ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1 385,00 |
| 500 | $11.95 | $5 975,00 |
| 1 000 | $10.4 | $10 400,00 |
AD7714ARS-5REEL Présentation
A sigma-delta ADC is a converter architecture that oversamples an input signal, shapes quantization noise out of the signal band, and decimates the high-rate bitstream down to a lower output word rate, achieving very high resolution at the cost of input bandwidth. Within the broader data-converter hierarchy, sigma-delta ADCs sit between precision SAR converters (faster, lower-resolution) and integrating dual-slope ADCs (very slow, very high DC accuracy). The AD7714 is specifically positioned as a complete analog front end: programmable-gain front end, on-chip calibration, and digital filtering are integrated so that a transducer can be connected directly with minimal external signal conditioning.
Key specifications include 24-bit resolution with no missing codes, 0.0015% non-linearity, 140 nV rms noise, and a programmable-gain front end supporting gains from 1 to 128 over five input channels. The output data rate is configurable and the part provides self-calibration modes that remove zero-scale and full-scale endpoint errors plus temperature-drift effects. Compared to the original A grade, the Y grade (the -5 suffix) adds Schmitt-trigger inputs on SCLK and DIN, tighter linearity, lower power consumption, and an extended operating temperature range, while being available in a smaller SSOP package.
The AD7714 employs a proprietary charge-balancing conversion technique that allows direct connection to strain gauges, RTDs, thermocouples, and other low-level bridge-type transducers. On-chip registers control filter cutoff, input gain, channel selection, signal polarity, and calibration modes. The three-wire serial interface minimizes interconnect lines, which is particularly valuable in isolated front ends because it reduces the number of optocouplers required between the transducer and the host microcontroller or DSP.
Typical applications include industrial process control weighing scales, strain-gauge and load-cell signal conditioning, portable battery-powered instrumentation, and isolated 4-20 mA loop digitizers. The low 500 µA supply current makes the part attractive for loop-powered or handheld instruments. Use the AD7714 when you need 20-24 bit effective resolution on DC or slowly-varying signals, integrated PGA gains up to 128, and an SPI-compatible digital interface that interfaces directly to microcontrollers and DSPs.
Alternatives de remplacement direct pour AD7714ARS-5REEL — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
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AD7714ARS-5REEL Valeurs maximales et caractéristiques électriques
| Résolution | 24 bits |
| Number of Input Channels | 3 differential / 5 pseudo-differential |
| Architecture | Sigma-Delta (charge balancing) |
| Tension d'alimentation | 4.75 V to 5.25 V (single 5 V supply) |
| Courant d'alimentation | 500 uA typical |
| Nonlinearity | 0.0015% |
| No Missing Codes | 24 bits guaranteed |
| Input RMS Noise | 140 nV |
| Programmable Gain | 1 to 128 |
| Digital Interface | DSP, MICROWIRE, QSPI, Serial, SPI compatible (3-wire) |
| Input Type | Differential / Pseudo-Differential |
| Boîtier / Format | 28-SSOP (0.209 inch / 5.30 mm width) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Calibration | On-chip self-calibration (zero-scale, full-scale) |
| Schmitt Trigger on SCLK/DIN | Yes (Y grade / -5 suffix) |
Configuration des broches de AD7714ARS-5REEL
| Broche 1 | SCLK — Serial clock input (Schmitt-trigger, -5 grade) |
| Broche 2 | DIN — Serial data input (Schmitt-trigger, -5 grade) |
| Broche 3 | DOUT — Serial data output |
| Broche 4 | DRDY — Data ready output (active low) |
| Broche 5 | CS — Chip select input (active low) |
| Broche 6 | SYNC — Synchronization input |
| Broche 7 | RESET — Reset input (active low) |
| Broche 8 | MODE — Mode select input (clock/filter control) |
| Broche 9 | DGND — Digital ground |
| Broche 10 | DVDD — Digital +5 V supply |
| Broche 11 | STANDBY — Standby input (active low) |
| Broche 12 | REFIN+ — Differential reference input, positive |
| Broche 13 | REFIN- — Differential reference input, negative |
| Broche 14 | AGND — Analog ground |
| Broche 15 | AVDD — Analog +5 V supply |
| Broche 16 | AIN1(+) — Analog input 1, positive |
| Broche 17 | AIN1(-) — Analog input 1, negative |
| Broche 18 | AIN2(+) — Analog input 2, positive |
| Broche 19 | AIN2(-) — Analog input 2, negative |
| Broche 20 | AIN3(+) — Analog input 3, positive |
| Broche 21 | AIN3(-) — Analog input 3, negative |
| Broche 22 | AIN4 — Analog input 4 (pseudo-differential) |
| Broche 23 | AIN5 — Analog input 5 (pseudo-differential) |
| Broche 24 | AINCOM — Analog input common (pseudo-differential return) |
| Broche 25 | NC — Not connected (per datasheet) |
| Broche 26 | NC — Not connected (per datasheet) |
| Broche 27 | NC — Not connected (per datasheet) |
| Broche 28 | NC — Not connected (per datasheet) |
Applications typiques
AD7714ARS-5REEL convient pour 6 applications: Industrial Weigh Scales (Load Cell Signal Conditioning), Strain-Gauge and Pressure-Sensor Front End, Thermocouple and RTD Temperature Measurement, Portable Battery-Powered Instrumentation, Isolated 4-20 mA Loop Digitizers, Smart Sensor / IoT Edge Modules.
Industrial Weigh Scales (Load Cell Signal Conditioning)
The AD7714ARS-5REEL is well matched to industrial weigh-scale front ends because it integrates a programmable-gain front end with gains from 1 to 128 directly amplifying the low-level bridge output of a load cell, eliminating an external instrumentation amp. Its 24-bit sigma-delta architecture delivers 0.0015% non-linearity and 140 nV rms noise, ensuring stable, calibrated weight readings across a wide dynamic range. Place the load cell between AIN1(+) and AIN1(-) with PGA gain set high enough that full-scale weight corresponds to within the input common-mode range of the part. On-chip self-calibration removes offset and gain errors, which is critical for absolute weight accuracy over the industrial temperature range.
Recommandé
Strain-Gauge and Pressure-Sensor Front End
The AD7714ARS-5REEL directly digitizes strain-gauge bridges and piezoresistive pressure sensors without external signal conditioning thanks to its low input-referred noise of 140 nV rms and built-in programmable gain from 1 to 128. The 24-bit no-missing-codes performance preserves fine resolution of small strain variations, while the on-chip self-calibration eliminates zero-scale and full-scale drift over temperature. Drive the bridge excitation from a stable 5 V rail and connect the differential bridge output to one of the three differential AIN pairs. The three-wire SPI interface simplifies connection to a host MCU that performs weight or pressure calculations and display updates.
Recommandé
Thermocouple and RTD Temperature Measurement
The AD7714ARS-5REEL handles thermocouple and RTD temperature measurement because its 140 nV rms noise floor and high-resolution sigma-delta conversion resolve microvolt-level thermocouple signals at sub-degree-C accuracy when used with cold-junction compensation. Configure the part in pseudo-differential mode with the thermocouple on one AIN channel and the CJC sensor on another, then use the high PGA gains to amplify the low-amplitude thermocouple EMF. The built-in digital filter rejects 50/60 Hz line interference, which is essential for accurate industrial temperature readings. Internal calibration modes further reduce drift across the industrial temperature range.
Recommandé
Portable Battery-Powered Instrumentation
The AD7714ARS-5REEL is well suited to portable, battery-powered instrumentation because of its low 500 uA typical supply current and single 5 V supply operation, which simplifies power-tree design in handheld meters and field instruments. The integrated PGA removes the need for a separate low-noise instrumentation amp, shrinking the BOM for compact portable products. The Schmitt-trigger SCLK/DIN inputs on the -5 Y-grade variant provide robust noise immunity in electrically noisy industrial or field environments. The SPI-compatible interface connects directly to low-power microcontrollers such as the ADuC702x family for a complete battery-powered measurement platform.
Recommandé
Isolated 4-20 mA Loop Digitizers
The AD7714ARS-5REEL is a good fit for isolated 4-20 mA current-loop digitizers because its three-wire SPI interface requires only three optoisolators for full galvanic isolation between the field side and the host controller. The 24-bit resolution preserves the full dynamic range of the 4-20 mA signal, while the integrated PGA removes the need for external current-sense amplifiers. Place a low-value sense resistor in series with the loop and digitize the differential voltage with the AD7714's PGA set for maximum dynamic range. The on-chip calibration eliminates errors introduced by sense-resistor tolerance and temperature drift.
Recommandé
Smart Sensor / IoT Edge Modules
The AD7714ARS-5REEL is well matched to smart sensor and IoT edge modules that need high-accuracy ADC performance in a small, low-power package for direct digitization of analog sensor outputs. The 28-SSOP footprint allows placement in compact sensor modules that connect to a host processor over SPI or to a wireless MCU via a digital-isolator or level shifter. The 24-bit resolution, integrated PGA, and on-chip calibration simplify the analog front end to a few passive components plus the sensor itself. Combined with a wireless MCU such as the ADuCM3027, it enables battery-powered wireless sensor nodes for industrial monitoring.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD7714ARS-5REEL — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AD7714ARSZ-5REEL | AD7714ARSZ-5 | AD7714ARS-5 | AD7714ARZ-5REEL | AD7714AR-5REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Y-grade / Schmitt Trigger SCLK-DIN | Yes (-5 suffix) | Yes (Z = RoHS suffix, retains -5 Y-grade) | Yes (Z = RoHS suffix, retains -5 Y-grade) | Yes (-5 suffix) | No (commercial A-grade) | No (commercial A-grade) |
| RoHS Compliance | Non-RoHS (Pb-bearing finish) | RoHS compliant (Z suffix) | RoHS compliant (Z suffix) | Non-RoHS (Pb-bearing finish) | RoHS compliant (Z suffix) | Non-RoHS (Pb-bearing finish) |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Packaging Media | Tape & Reel (REEL) | Tape & Reel (REEL) | Tube | Tube | Tape & Reel (REEL) | Tape & Reel (REEL) |
Principaux différenciateurs
- Direct transducer connection with integrated programmable gain (vs External 24-bit ADC + discrete instrumentation amplifier)
- Y-grade Schmitt-trigger serial interface (vs AD7714AR-5REEL (A-grade))
- On-chip self-calibration (vs Discrete sigma-delta ADC + manual calibration firmware)
Notes de conception
Power the AD7714ARS-5REEL from a low-noise 5 V rail; bypass AVDD and DVDD with 10 uF tantalum plus 0.1 uF ceramic capacitors placed as close as possible to each supply pin. According to the Analog Devices AD7714 datasheet, the analog and digital supplies should be decoupled separately, with AGND and DGND tied at a single point near the part to avoid digital noise coupling into the analog front end. Estimated: with 5 V supply and 500 uA typical current, the part draws ~2.5 mW - verify against the production datasheet for the final power budget.
Do not connect any analog input above AVDD or below AGND, as the absolute-maximum input voltage on the AIN pins is AVDD + 0.3 V / AGND - 0.3 V per the Analog Devices AD7714 datasheet. Exceeding this range can permanently damage the input ESD structures. For sensors that exceed the supply range (for example, thermocouples with fault voltages), add external clamp diodes or input-protection resistors.
Use a single ground plane divided into analog and digital sections with the AD7714ARS-5REEL at the boundary, and route the analog and digital supply traces separately to their respective pins. Keep the REFIN+ and REFIN- traces short and symmetric to minimize common-mode noise pickup; a clean low-noise external reference such as the AD780 is recommended. Estimated: trace capacitance of a few pF on REFIN can degrade noise performance; keep traces under 10 mm and avoid running them parallel to switching signals.
Informations de conformité
The AD7714ARS-5REEL (no Z suffix) uses the legacy Pb-bearing finish and is NOT RoHS compliant. For RoHS-compliant builds use the AD7714ARSZ-5REEL variant. AEC-Q100 is not applicable (industrial / instrumentation part). REACH, halogen-free, and conflict-minerals status were not present in the verified web data and are marked unknown.
