AD7730BRUZ-REEL7 - 24-Bit Bridge Transducer AFE, 1.2kSPS | ADI
Référence : AD7730BRUZ-REEL7 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $27.85 | $27,85 |
| 10 | $24.5 | $245,00 |
| 100 | $21.2 | $2 120,00 |
| 500 | $18.95 | $9 475,00 |
| 1 000 | $17.4 | $17 400,00 |
AD7730BRUZ-REEL7 Présentation
An analog front end (AFE) is a signal-conditioning circuit that sits between a sensor and a digital signal processor, converting analog signals into digital data. In the data-converter domain, an AFE typically combines amplification, filtering, and analog-to-digital conversion in one block. The AD7730 is a specialized AFE for bridge transducers such as load cells and pressure sensors, where it provides high-resolution conversion of small differential signals. It belongs to the sigma-delta ADC family, which uses oversampling and noise shaping to achieve high effective resolution. The AD7730's architecture includes a programmable gain amplifier (PGA) that allows direct connection to low-level transducer outputs, eliminating external gain stages and reducing board complexity.
Key features of the AD7730BRUZ-REEL7 include 24-bit resolution, a maximum output data rate of 1.2 kSPS, and a power dissipation of 125 mW. The programmable gain front end provides gains up to 128, allowing it to handle input signals as low as ±10 mV full-scale. Additional features include a differential reference input, an on-chip digital low-pass filter, a serial interface compatible with microcontrollers and DSPs, and self-calibration plus system-calibration modes. The device is specified over the industrial temperature range of -40 °C to +85 °C, and features an offset drift below 5 nV/°C and a gain drift below 2 ppm/°C.
Technically, the AD7730 uses a sigma-delta modulator followed by a digital low-pass filter. The modulator oversamples the input at a high rate and produces a bitstream that is then filtered and decimated to deliver the final 24-bit output word. The programmable gain front end is based on an analog modulator with proprietary architecture that provides high linearity and low noise. The on-chip self-calibration feature automatically corrects offset and gain errors, ensuring accurate measurements over time and temperature; offset drift is specified at less than 5 nV/°C and gain drift at less than 2 ppm/°C.
Typical applications for the AD7730BRUZ-REEL7 include weigh scales, pressure transmitters, and other industrial measurement systems. Its high resolution and low noise make it ideal for precision measurement of small signals from bridge sensors, and the device is also suitable for portable instrumentation where low power consumption matters.
When designing with the AD7730, provide a clean, low-noise +5 V supply and use proper PCB layout techniques to minimize noise pickup. Drive the reference input with a low-impedance source and filter the analog inputs to remove high-frequency noise. The serial interface allows easy connection to microcontrollers, and the device can be configured for various output data rates and filter settings.
This page synthesizes distributor pricing, drop-in alternatives sourced from Analog Devices' pin-compatible AD7730 family, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour AD7730BRUZ-REEL7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec AD7730BRUZ-REEL7 (même facteur de forme et même empreinte) — différant par Calibration, Package, Resolution, Number of Channels, Programmable Gain.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD7730BRUZ
✅ Remplacement direct✓ En stock
$13.1 / unité
Voir la fiche technique →AD7730BRUZ-REEL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7730BRU-REEL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7730BRUZ
✅ Remplacement direct✓ En stock
$13.1 / unité
Voir la fiche technique →AD7730BRUZ-REEL7.
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7730BRUZ-REEL7 Valeurs maximales et caractéristiques électriques
| Product Type | Analog Front End (AFE) / Sigma-Delta ADC |
| Résolution | 24 bit |
| Number of Channels | 1 channel AFE |
| Maximum Output Data Rate | 1.2 kSPS |
| Tension d'alimentation | +5 V (single supply, 4.75 V to 5.25 V) |
| Power Dissipation | 125 mW |
| Unipolar Input Ranges | 0 to +10 mV, +20 mV, +40 mV, +80 mV |
| Bipolar Input Ranges | ±10 mV, ±20 mV, ±40 mV, ±80 mV |
| Programmable Gain | Up to 128 |
| Analog Inputs | 2 buffered differential inputs |
| Reference Input | Differential |
| Serial Interface | 3-wire SPI/serial, microcontroller and DSP compatible |
| Calibration | Self-calibration and system-calibration |
| Offset Drift | < 5 nV/°C |
| Gain Drift | < 2 ppm/°C |
| Température de fonctionnement | -40 °C to +85 °C |
| Boîtier | 24-pin TSSOP (4.40 mm body width) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (REEL7, 7-inch) |
| Statut RoHS | Compliant |
Configuration des broches de AD7730BRUZ-REEL7
| Broche 1 | SCLK — Serial clock input |
| Broche 2 | DOUT — Serial data output |
| Broche 3 | DIN — Serial data input |
| Broche 4 | /CS — Chip select (active low) |
| Broche 5 | DGND — Digital ground |
| Broche 6 | DVDD — Digital supply (+5 V) |
| Broche 7 | /RDY — Ready output (active low) |
| Broche 8 | /RESET — Reset input (active low) |
| Broche 9 | MODE — Operating mode / standby control |
| Broche 10 | AIN1+ — Analog input 1 positive |
| Broche 11 | AIN1- — Analog input 1 negative |
| Broche 12 | AIN2+ — Analog input 2 positive |
| Broche 13 | AIN2- — Analog input 2 negative |
| Broche 14 | REFIN+ — Reference input positive |
| Broche 15 | REFIN- — Reference input negative |
| Broche 16 | AGND — Analog ground |
| Broche 17 | AVDD — Analog supply (+5 V) |
| Broche 18 | STANDBY — Standby input |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
| Broche 21 | NC — Not connected (per datasheet) |
| Broche 22 | NC — Not connected (per datasheet) |
| Broche 23 | NC — Not connected (per datasheet) |
| Broche 24 | NC — Not connected (per datasheet) |
Applications typiques
AD7730BRUZ-REEL7 convient pour 6 applications: Weigh Scales / Load Cells, Pressure Transmitters, Industrial Process Control, Portable Instrumentation, Strain Gauge / Bridge Signal Conditioning, Medical Patient Monitoring.
Weigh Scales / Load Cells
The AD7730BRUZ-REEL7 is purpose-built for weigh-scale and load-cell applications where microvolt-level bridge signals must be digitized at 24-bit resolution. Its programmable gain front end (up to 128x) accepts the 1-3 mV/V output of a typical 350-ohm load cell directly, eliminating external instrumentation amplifiers and reducing board cost. The 1.2 kSPS maximum output rate is well matched to the slow settling required by weight measurements, and the on-chip self-calibration corrects offset and gain errors so the scale holds accuracy across the -40 °C to +85 °C industrial range. The 24-bit sigma-delta converter provides >100,000 count resolution at the slowest output rate, sufficient for legal-for-trade weighing and precision laboratory balances.
Recommandé
Pressure Transmitters
Pressure transmitters using strain-gauge or piezoresistive bridges benefit from the AD7730BRUZ-REEL7's low offset drift of less than 5 nV/°C and gain drift of less than 2 ppm/°C. These low-drift parameters preserve calibration accuracy across the industrial temperature range, eliminating the need for periodic re-zero in the field. The differential reference input accommodates ratiometric measurement from the bridge excitation supply, automatically cancelling excitation voltage noise. The 24-bit resolution supports pressure spans below 100 mbar with sub-mbar repeatability, suitable for HVAC, hydraulic, and process-control instrumentation. Combined with the serial interface, the AD7730 simplifies microcontroller firmware for linearization and temperature compensation.
Recommandé
Industrial Process Control
In industrial process-control systems, the AD7730BRUZ-REEL7 digitizes millivolt-level signals from thermocouples, RTDs, and bridge-type flow meters at 24-bit resolution. The 1.2 kSPS maximum data rate supports closed-loop control loops with update rates of a few hundred Hz, while slower output rates (50 Hz, 60 Hz, 50/60 Hz rejection) reject mains interference for stable readings in electrically noisy factory environments. The on-chip digital filter is user-programmable, allowing trade-off between settling time and effective resolution. The single +5 V supply simplifies power design, and the 24-pin TSSOP package supports compact PLC analog-input modules with multiple channels per board.
Recommandé
Portable Instrumentation
The AD7730BRUZ-REEL7 fits portable battery-powered instrumentation where board area, accuracy, and reasonable power consumption matter. The 125 mW power dissipation is acceptable for hand-held instruments powered from a 4-cell NiMH pack; the differential reference input allows ratiometric measurement that cancels battery-voltage sag as the cells discharge. The 24-pin TSSOP package keeps the PCB footprint small, leaving room for displays, keypads, and wireless modules. The integrated PGA eliminates external instrumentation amplifiers, shrinking the BOM and improving reliability. Typical portable applications include handheld multimeters, calibration tools, and field-service diagnostic kits.
Recommandé
Strain Gauge / Bridge Signal Conditioning
The AD7730BRUZ-REEL7 is an excellent fit for generic strain-gauge and bridge-signal conditioning designs beyond weighing and pressure. The two buffered differential analog inputs allow the device to multiplex between two bridge sensors, supporting differential-pressure or load-plus-temperature compensation measurements. Programmable gains from 1 to 128 let the designer match the ADC full-scale to any bridge output between 10 mV and 80 mV. The differential reference input accommodates both grounded and floating bridges, simplifying mechanical-sensor integration. The 24-bit resolution and self-calibration make the part suitable for materials-testing rigs, structural-health monitors, and laboratory force-test fixtures.
Recommandé
Medical Patient Monitoring
Although not AEC-Q100 qualified, the AD7730BRUZ-REEL7 is used in medical patient-monitoring equipment where its low noise and high resolution digitize physiological signals. The 24-bit ADC captures low-amplitude signals from respiration belts, weight scales, and pressure cuffs with sufficient dynamic range for clinical-grade accuracy. The differential inputs reject common-mode interference from 50/60 Hz mains and from electrosurgical equipment in operating-room environments. The on-chip digital filter provides 50/60 Hz simultaneous rejection at appropriate output rates, eliminating periodic line-frequency artifacts. Combined with a microcontroller or DSP, the AD7730 enables compact bedside monitors and ambulatory recorders.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD7730BRUZ-REEL7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AD7730BRUZ | AD7730BRUZ-REEL | AD7730BRU-REEL7 | AD7730BRU | AD7730BRUZ-REEL7. |
|---|---|---|---|---|---|---|
| Package | 24-pin TSSOP | 24-pin TSSOP (same) | 24-pin TSSOP (same) | 24-pin TSSOP (same) | 24-pin TSSOP (same) | 24-pin TSSOP (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit | 24 bit | 24 bit |
| Maximum Data Rate | 1.2 kSPS | 1.2 kSPS | 1.2 kSPS | 1.2 kSPS | 1.2 kSPS | 1.2 kSPS |
| Supply Voltage | +5 V (4.75 V to 5.25 V) | +5 V | +5 V | +5 V | +5 V | +5 V |
| Power Dissipation | 125 mW | 125 mW | 125 mW | 125 mW | 125 mW | 125 mW |
| RoHS Compliance | Yes (Z suffix, lead-free) | Yes (Z suffix) | Yes (Z suffix) | No (leaded finish) | No (leaded finish) | Yes (Z suffix) |
| Packaging Format | 7-inch Tape & Reel (REEL7) | Tube | 13-inch Reel | 7-inch Reel | Tube | 7-inch Reel |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Principaux différenciateurs
- Complete bridge-transducer AFE with integrated PGA (vs AD7730BRU-REEL7)
- 24-bit sigma-delta ADC with 5 nV/°C offset drift (vs AD7730BRUZ-REEL)
- Self-calibration and system-calibration on-chip (vs AD7730BRUZ)
Notes de conception
Estimated: The AD7730BRUZ-REEL7 draws approximately 25 mA from +5 V (125 mW / 5 V), creating a digital load that can couple switching transients into the analog front end. Place a 10 µF tantalum and 100 nF ceramic decoupling capacitor directly at the AVDD pin (pin 17) and a separate 100 nF ceramic at DVDD (pin 6), with AGND and DGND tied to a star ground under the package. Use an LDO or low-noise linear regulator (such as an ADP7104 or ADR4550 reference/regulator combination) to derive AVDD from the system +5 V rail to minimize switching noise from upstream DC-DC converters reaching the sigma-delta modulator.
Do not connect any of the NC pins (pins 19-24) to anything other than their default no-connect state; tying NC pins to ground or supply can cause internal latch-up or affect calibration constants. Always run the on-chip self-calibration after power-up stabilization and after any change to input range, gain, or output data rate; skipping self-calibration will leave residual offset and gain errors that exceed the datasheet limits. The REFIN+/REFIN- pins must be driven from a low-impedance, low-noise reference source - a poor reference dominates the noise floor of the entire conversion chain.
Route the analog inputs (AIN1+, AIN1-, AIN2+, AIN2-) and reference inputs (REFIN+, REFIN-) as differential pairs with guard traces tied to AGND, and keep them away from digital lines such as SCLK, DOUT, DIN, and /CS. Place the bridge sensor or input source within 50 mm of the analog input pins to minimize noise pickup; for very low input ranges (±10 mV), use a ground plane under the input traces to reduce EMI coupling. The exposed pad (if present) or pin-1 corner of the TSSOP must be oriented consistently with the silkscreen pin-1 marker to avoid reversed-mounting during assembly.
The AD7730BRUZ-REEL7's on-chip digital filter offers programmable output data rates including 50 Hz, 60 Hz, and simultaneous 50/60 Hz rejection; selecting these rates provides >100 dB of mains-frequency rejection for stable readings in electrically noisy environments. Choose the slowest output rate consistent with your control-loop bandwidth to maximize effective resolution - at the slowest rate the part delivers better than 20 effective bits at the ±10 mV range, ideal for weigh-scale and precision pressure measurements.
Informations de conformité
RoHS and REACH compliance per Abacus Technologies and DigiKey product listings. Z-suffix ordering code indicates lead-free terminal finish. Conflict-free DRC status reported. Halogen-free status not explicitly stated in available data. Not AEC-Q100 qualified - this is an industrial-grade part.
