AD7783BRU-REEL - 24-Bit Pin-Configured Sigma-Delta ADC | Analog Devices
MPN: AD7783BRU-REEL ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
AD7783BRU-REEL Overview
An ADC (Analog-to-Digital Converter) is a data-conversion integrated circuit that translates continuous analog signals into discrete digital codes. Sigma-delta ADCs use oversampling and digital filtering to achieve very high resolution (often 16-24 bits) at low sample rates; they fall under the data-converter IC category within signal-chain semiconductors. The AD7783 specifically is a precision measurement ADC targeting sensor front-ends where minimal firmware overhead is critical.
Key features include a built-in programmable gain amplifier (PGA) with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, integrated 10 microampere excitation current sources (selectable between 10 microampere and 1 milliampere via external pins), on-chip digital filtering, and a simple SPI/DSP-compatible serial interface requiring no on-chip registers. The read-only, pin-configured design eliminates software configuration steps, accelerating time-to-market and reducing firmware complexity.
The AD7783BRU-REEL uses a low-noise chopper-stabilized input front-end combined with a sigma-delta modulator and digital filter to deliver 24-bit noise-free resolution. The integrated current sources directly drive resistive bridge sensors (load cells, strain gauges, pressure sensors), removing the need for external precision current references. Differential rail-to-rail inputs support ground-referenced and below-ground sensor outputs.
Typical applications include weigh scales and load-cell bridges, industrial process transmitters, pressure transmitters, and temperature sensor conditioning via RTD/thermocouple front-ends. The TSSOP-16 footprint is compatible with high-density analog layouts where PCB area is constrained.
Designers should provide clean analog supplies and place 100 nF decoupling capacitors close to AVDD and DVDD pins. Bridge sensors should connect directly to the differential inputs through a low-pass RC filter to attenuate RFI. The on-chip current source is intended for class II bridges; high-current loads require external drivers.
This page synthesizes distributor pricing, drop-in alternative parts, and design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for AD7783BRU-REEL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7783BRU-REEL (same form factor and footprint) — differing in RoHS Status, Package, Resolution, Interface, Number of Input Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7738BRU-REEL7
✅ Drop-In✓ In Stock
$18.5 / Unit
View Datasheet →AD7707BRZ-REEL
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →AD7719BRUZ-REEL
✅ Drop-In✓ In Stock
$5.75 / Unit
View Datasheet →AD7708BRU-REEL
✅ Drop-In✓ In Stock
$6.19 / Unit
View Datasheet →AD7776ARZ-REEL
✅ Drop-In✓ In Stock
$4.25 / Unit
View Datasheet →AD7783BRU-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 24 bits |
| Architecture | Sigma-Delta |
| Number of Inputs | 1 (differential) |
| Output Data Rate | 19.79 SPS |
| Input Type | Differential, rail-to-rail |
| Supply Voltage (AVDD/DVDD) | 2.7 V to 5.5 V |
| Interface | SPI, DSP-compatible (read-only) |
| Integrated PGA | Yes (gain 1 to 128) |
| Excitation Current Source | 10 uA or 1 mA (pin-selectable) |
| Package | 16-TSSOP (RU-16) |
| Operating Temperature | -40 C to +85 C |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
AD7783BRU-REEL Pin Configuration
| Pin 1 | DVDD — Digital supply (2.7 V to 5.5 V) |
| Pin 2 | DGND — Digital ground |
| Pin 3 | SCLK — Serial clock input (SPI) |
| Pin 4 | DOUT — Serial data output (SPI/DSP) |
| Pin 5 | DRDY — Data ready output (active low) |
| Pin 6 | IOUT1 — Excitation current source pin 1 |
| Pin 7 | IOUT2 — Excitation current source pin 2 |
| Pin 8 | AIN1(+) — Differential analog input positive |
| Pin 9 | AIN1(-) — Differential analog input negative |
| Pin 10 | REFIN(+) — Reference input positive |
| Pin 11 | REFIN(-) — Reference input negative |
| Pin 12 | AVSS — Analog negative supply / ground |
| Pin 13 | AVDD — Analog supply (2.7 V to 5.5 V) |
| Pin 14 | CS — Chip select input (active low) |
| Pin 15 | GAIN — PGA gain selection pin |
| Pin 16 | IEXC — Excitation current magnitude select |
Typical Applications
AD7783BRU-REEL is suitable for 6 applications: Weigh Scale and Load Cell Front-End, Industrial Pressure Transmitter, RTD Temperature Measurement Module, Strain-Gauge Bridge Sensor Conditioning, Battery-Powered Precision Data Logger, Medical Infusion Pump Sensor Interface.
Weigh Scale and Load Cell Front-End
The AD7783BRU-REEL is purpose-built for weigh-scale and load-cell bridge applications, where its integrated 10 uA / 1 mA excitation current sources drive a 350 ohm or 1000 ohm bridge directly without external precision references. The differential rail-to-rail inputs accept the millivolt-level bridge output directly, and the on-chip PGA provides gains of 1 to 128 to amplify low-output sensors. At 24-bit noise-free resolution and 19.79 SPS output rate, the device delivers >100,000-count dynamic range on a single conversion cycle, ideal for commercial scales with 0.01% accuracy. Designers place a low-pass RC filter on the input pair to attenuate RFI from motor drives and switching supplies in factory environments.
Recommended
Industrial Pressure Transmitter
In 4-20 mA pressure transmitter designs, the AD7783BRU-REEL digitizes the millivolt output of a bonded-foil or piezoresistive pressure sensor with 24-bit resolution. The integrated excitation current source directly powers the strain-gauge bridge, eliminating a separate LDO and reference IC and shrinking the BOM by up to three components. The low 19.79 SPS output rate is well-matched to pressure measurements that update at 10 Hz or less, and the digital filtering suppresses 50 Hz / 60 Hz mains interference that would otherwise dominate the noise floor. The TSSOP-16 footprint fits inside the limited board area of compact stainless-steel transmitter housings.
Recommended
RTD Temperature Measurement Module
For 3-wire and 4-wire RTD conditioning, the AD7783BRU-REEL's pin-selectable 1 mA excitation current source provides a stable bias for a PT100 or PT1000 platinum sensor, while the differential inputs reject common-mode line resistance. Combined with the on-chip PGA at gain 8 to 128, the device resolves 0.01 C temperature steps over the industrial -200 C to +850 C range with proper calibration. The single 2.7 V to 5.5 V supply matches battery-powered portable thermometer designs, and the read-only interface eliminates firmware overhead - critical for low-cost OEM modules. Designers typically add a 100 nF decoupling capacitor at AVDD and a low-pass RC filter at the sensor inputs.
Recommended
Strain-Gauge Bridge Sensor Conditioning
The AD7783BRU-REEL serves as the bridge-excitation and ADC front-end for strain-gauge force, torque, and vibration sensors in industrial automation. Its on-chip 10 uA current source is optimized for low-power class II bridges, while the 1 mA setting supports higher-output class I bridges. Differential inputs reject ground-loop noise common to factory-floor installations, and the sigma-delta architecture provides 24-bit noise-free resolution at the slow sample rates typical of force measurements. The TSSOP-16 package fits alongside the sensor on small instrumentation PCBs, and the read-only pin configuration means no microcontroller initialization sequence is required at power-up.
Recommended
Battery-Powered Precision Data Logger
For portable data loggers measuring slow-changing sensor signals (vibration, gas concentration, environmental parameters), the AD7783BRU-REEL offers low power consumption from a single 2.7 V to 5.5 V supply. The 19.79 SPS output rate keeps average current draw in the milliampere range, suitable for months-long deployments on a single 9 V battery or two AA cells. The integrated PGA eliminates an external instrumentation amplifier and its associated quiescent current, while the on-chip current sources drive resistive sensors without a separate reference. The TSSOP-16 package weighs less than 100 mg, fitting into miniature plastic enclosures.
Recommended
Medical Infusion Pump Sensor Interface
Although not AEC-Q100 qualified, the AD7783BRU-REEL's 24-bit resolution and integrated current sources are well-suited for non-automotive medical instruments such as infusion-pump flow sensors and blood-pressure monitoring modules. The differential rail-to-rail inputs handle the wide dynamic range of flow sensors (microampere-level standby to milliampere-level active flow), and the on-chip PGA accommodates low-output flow transducers without external amplification. The pin-configured read-only interface simplifies IEC 62304 firmware classification by reducing software complexity in the measurement path. Designers verify the full datasheet specifications and lifecycle status before committing to medical designs.
Recommended
Recommended Products Summary
Engineering reference data for AD7783BRU-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7738BRU-REEL7 | AD7707BRZ-REEL | AD7719BRUZ-REEL | AD7708BRU-REEL | AD7776ARZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSSOP-16 (RU-16) | TSSOP-16 (RU-16) - same | TSSOP-16 (RU-16) - same | TSSOP-16 (RU-16) - same | TSSOP-16 (RU-16) - same | TSSOP-16 (RU-16) - same |
| Resolution | 24 bits | 24 bits | 16 bits | 24 bits | 16 bits | 24 bits |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta |
| Number of Inputs | 1 differential | 8 differential | Pseudo-differential | 2 differential | 8/10 single-ended | 2 differential |
| Output Data Rate | 19.79 SPS | Variable, up to 8.4 kHz | Variable, up to 1 kHz | Variable, up to 105 Hz | Variable, up to 1.365 kHz | Variable, up to 128 kHz |
| Interface | SPI (read-only, pin-config) | SPI (register-config) | SPI (register-config) | SPI (register-config) | SPI (register-config) | SPI (register-config) |
| Integrated Current Sources | Yes (10 uA / 1 mA) | Yes (programmable) | No | Yes (programmable) | No | No |
| On-Chip PGA | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | No (passive inputs) |
| 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 |
Key Differentiators
- Pin-configured read-only interface eliminates firmware programming (vs AD7738BRU-REEL7)
- Integrated bridge excitation current sources drive sensors directly (vs AD7707BRZ-REEL)
- Single differential input channel matches dedicated bridge transducer applications (vs AD7719BRUZ-REEL)
Design Notes
Estimated: the AD7783BRU-REEL requires decoupling on both AVDD and DVDD pins. Place a 100 nF X7R ceramic capacitor within 3 mm of each supply pin and a 10 uF bulk capacitor at the regulator output. AVDD and DVDD should be tied together for single-supply operation. Star-ground topology is recommended to prevent digital return currents from corrupting the analog ground reference at the ADC's ground pin.
The AD7783BRU-REEL's 10 uA excitation current source is intended for class II bridges (e.g., 350 ohm to 1 kohm). High-output class I bridges or current loads above 1 mA require an external low-noise reference and a buffer op-amp such as the AD8628. Avoid capacitive loads directly on the IOUT pins - a series resistor of 100 ohms to 1 kohm stabilizes the current source when driving long cable harnesses.
Place a differential low-pass RC filter (R=100 ohm to 1 kohm, C=10 nF to 100 nF) at the AIN+ / AIN- pins to attenuate RFI from motors and switching supplies. Common-mode chokes (e.g., 1 mH) further suppress conducted interference on long sensor cables. The bridge sensor should connect through shielded twisted-pair wiring with the shield grounded only at the ADC end.
The TSSOP-16 thermal pad should be soldered to a copper pour on the top layer to reduce thermal resistance. Keep digital traces (SCLK, DOUT, DRDY) routed away from the analog inputs and bridge current sources to minimize digital crosstalk. A continuous analog ground plane on layer 2 directly under the AD7783BRU-REEL and bridge resistors stabilizes the reference voltage.
Compliance Information
RoHS compliant per DigiKey product listing. Not AEC-Q100 qualified - for automotive applications, evaluate AD7738BRU-REEL7 or other automotive-grade ADC alternatives. Halogen-free status not confirmed in verified web data.
