AD7787BRM-REEL - 24-Bit Sigma-Delta ADC, 2-Ch, 10-MSOP | Analog Devices
MPN: AD7787BRM-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $7.95 | $79.50 |
| 100 | $6.4 | $640.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $5.05 | $5,050.00 |
AD7787BRM-REEL Overview
A sigma-delta (Σ-Δ) ADC is a type of oversampling converter that uses noise-shaping and digital filtering to achieve very high resolution at low bandwidth. Within the hierarchy of precision converters, the AD7787 belongs to the family of low-frequency, low-noise 24-bit Σ-Δ ADCs aimed at sensor, weigh-scale, and industrial process-control front ends, sitting between general-purpose SAR ADCs and high-speed pipeline ADCs in the data-converter taxonomy. The combination of an on-chip instrumentation-grade front end (low-noise PGA), precision reference input, and digital filtering removes most of the analog signal-chain burden from the host microcontroller.
Key features of the AD7787BRM-REEL include simultaneous 50 Hz and 60 Hz mains rejection at the 16.7 Hz update rate, an internal clock, and a simple SPI-compatible serial interface. The buffered input allows direct connection of high-impedance sensors, while the differential input can be routed for true bridge measurements. Power-down mode reduces consumption to microampere levels between conversions, preserving battery life in remote or wireless sensor nodes.
Typical applications span weigh scales, temperature measurement bridges (RTD and thermocouple conditioning with companion amplifiers), industrial process-control loops, portable instrumentation, smart transmitters, and 4-20 mA loop-powered sensor modules. Its low noise floor and integrated front end simplify EMC-compliant designs where conducted noise from upstream regulators can degrade measurement integrity.
When designing with the AD7787BRM-REEL, pay close attention to grounding and analog/digital partitioning. Star-ground the analog and digital returns near the ADC's GND pin, decouple AVDD with a 10 µF tantalum plus 0.1 µF ceramic, and place the reference decoupling capacitors as close to the REF+ and REF- pins as possible. Use guard rings around high-impedance analog traces to minimise leakage.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, delivering information gain over the OEM datasheet alone.
Drop-in alternatives for AD7787BRM-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 AD7787BRM-REEL (same form factor and footprint) — differing in Number of Input Channels, Package, Resolution, RoHS Status, Supply Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7787BRMZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7787BRMZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7708BRU-REEL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.19 / Unit
View Datasheet →AD7787BRM-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 24 bits |
| Number of Input Channels | 2 (1 differential + 1 single-ended) |
| Converter Architecture | Sigma-Delta (Σ-Δ) |
| Input Type | Differential / Single-ended (buffered or unbuffered) |
| Supply Voltage Range | 2.5 V to 5.25 V (5.25 V max) |
| Supply Current - Normal Mode | 75 µA max |
| Supply Current - Power-Down Mode | 1 µA max |
| Update Rate | 9.5 Hz (low-noise mode); 16.7 Hz (normal) |
| RMS Noise | 9.5 Hz update rate, 19.5-bit p-p resolution (22 bits effective) |
| Integral Nonlinearity (INL) | 3.5 ppm typical |
| Mains Rejection | Simultaneous 50 Hz / 60 Hz rejection |
| Interface | SPI-compatible serial |
| Package | 10-pin MSOP (RM) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (BRM suffix = Pb-free matte tin) |
| Internal Clock | Yes |
AD7787BRM-REEL Pin Configuration
| Pin 1 | SCLK — Serial clock input (SPI) |
| Pin 2 | DOUT/RDY — Serial data output / data ready (active low) |
| Pin 3 | DIN — Serial data input (SPI) |
| Pin 4 | SYNC/PDWN — Synchronization / power-down control input |
| Pin 5 | GND — Ground reference |
| Pin 6 | AIN1(+) — Positive analog input (differential / single-ended) |
| Pin 7 | AIN1(-) — Negative analog input (differential input) |
| Pin 8 | REF IN+ — Positive reference input |
| Pin 9 | REF IN- — Negative reference input |
| Pin 10 | AVDD — Analog supply voltage (2.5 V to 5.25 V) |
Typical Applications
AD7787BRM-REEL is suitable for 6 applications: Weigh Scale / Load Cell Measurement, RTD Temperature Measurement Front End, Portable Industrial Process Control Loops, Smart Sensor / IoT Wireless Nodes, Medical Patient Monitoring Instrumentation, Bench-top Multimeter and Calibration Instrumentation.
Weigh Scale / Load Cell Measurement
The AD7787BRM-REEL is purpose-built for weigh-scale and load-cell applications where the differential input accepts a 350 ohm bridge directly, eliminating external instrumentation amplifiers. With 19.5-bit p-p resolution at the 9.5 Hz update rate and 3.5 ppm typical INL, the device delivers calibrated weight readings within 0.01 percent FS without post-calibration. The 75 µA typical supply current enables battery-powered retail scales that operate for months on a single cell, while power-down mode at 1 µA reduces standby drain between measurements. Compared to discrete op-amp plus SAR ADC solutions, the AD7787BRM-REEL shrinks the analog front end to a single 10-pin MSOP, simplifying EMC compliance and reducing BOM cost.
Recommended
RTD Temperature Measurement Front End
The AD7787BRM-REEL is well suited for 4-wire RTD temperature measurement bridges in industrial process control and laboratory instrumentation. Its low-noise sigma-delta architecture resolves sub-millikelvin temperature changes when paired with a PT100 or PT1000 sensor, while the integrated differential input rejects common-mode noise from long sensor cables. Simultaneous 50 Hz and 60 Hz rejection at the 16.7 Hz update rate filters mains-induced interference without external notch filters. The 2.5 V to 5.25 V supply range allows direct connection to 3.3 V or 5 V microcontroller rails, and 1 µA power-down current suits battery-backed temperature data loggers in remote installations.
Recommended
Portable Industrial Process Control Loops
In 4-20 mA loop-powered and battery-powered process-control transmitters, the AD7787BRM-REEL digitizes pressure, flow, and level sensor outputs with 24-bit precision while drawing only 75 µA from the loop. The integrated front end accepts both differential bridge and single-ended sensor outputs without external signal conditioning, simplifying intrinsically safe designs. Simultaneous 50 Hz and 60 Hz rejection ensures accurate readings in global deployments where mains frequency varies. The 10-MSOP footprint fits in the tight round enclosures of field-mount transmitters, and the SPI-compatible serial interface connects directly to low-pin-count microcontrollers such as ADuC family or external Cortex-M0 parts.
Recommended
Smart Sensor / IoT Wireless Nodes
The AD7787BRM-REEL enables battery-life-multiyear wireless sensor nodes by combining 24-bit precision with 1 µA power-down current and 75 µA active supply draw. Its low noise floor allows direct digitization of strain-gauge, bridge, and electrochemical sensor outputs without amplification, reducing BOM count and PCB area in compact IoT modules. The simple SPI interface connects to popular low-power MCUs and wireless SoCs, while the small 10-MSOP package fits in sensor housings smaller than a coin cell. Designers can duty-cycle the ADC and use the power-down pin to extend coin-cell life beyond 5 years in periodic-sampling applications.
Recommended
Medical Patient Monitoring Instrumentation
The AD7787BRM-REEL serves medical-grade low-frequency monitoring devices such as infusion pump flow sensors, body-impedance measurement, and wearable vital-sign monitors. Its 24-bit resolution and low noise enable accurate measurement of small biopotential signals, while the integrated front end reduces analog patient count - critical for medical EMI/EMC compliance. The 2.5 V to 5.25 V supply range allows single-rail designs with lithium-ion or 3.3 V regulated supplies. Simultaneous 50 Hz and 60 Hz rejection eliminates mains-line interference that otherwise corrupts biopotential readings in clinical environments with mixed power systems.
Recommended
Bench-top Multimeter and Calibration Instrumentation
Precision bench-top multimeters, calibration standards, and laboratory instrumentation benefit from the AD7787BRM-REEL's 24-bit resolution and 3.5 ppm typical INL for DC voltage and resistance calibration transfer standards. Its low-noise architecture provides better than 7.5-digit DC linearity when averaged, and the differential input allows direct 4-wire resistance and ratiometric measurements with external precision references. The internal clock eliminates external crystal requirements, and the small 10-MSOP package frees board space for display drivers, communication interfaces, and keypad scanners in handheld instruments. Power-down mode allows the multimeter to meet stringent standby power regulations between measurements.
Recommended
Recommended Products Summary
Engineering reference data for AD7787BRM-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7787BRMZ-RL | AD7787BRMZ |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-MSOP (RM) | 10-MSOP (RM) - same | 10-MSOP (RM) - same |
| Resolution | 24 bits | 24 bits | 24 bits |
| Supply Voltage | 2.5 V to 5.25 V | 2.5 V to 5.25 V | 2.5 V to 5.25 V |
| Normal-Mode Supply Current | 75 µA max | 75 µA max | 75 µA max |
| Power-Down Current | 1 µA max | 1 µA max | 1 µA max |
| Update Rate | 9.5 Hz / 16.7 Hz | 9.5 Hz / 16.7 Hz | 9.5 Hz / 16.7 Hz |
| Number of Input Channels | 2 (1 diff + 1 SE) | 2 (1 diff + 1 SE) | 2 (1 diff + 1 SE) |
| RoHS Status | Compliant (matte-tin) | Compliant (matte-tin) | Compliant (matte-tin) |
Key Differentiators
- Integrated low-noise analog front end eliminates external op-amps (vs Discrete op-amp + SAR ADC weigh-scale solution)
- Ultra-low power-down current of 1 µA enables multi-year battery life (vs AD7788BRMZ (16-bit sigma-delta in same family))
- Simultaneous 50 Hz / 60 Hz rejection without external notch filters (vs General-purpose SAR ADCs)
Design Notes
Decouple AVDD with a 10 µF tantalum (or low-ESR ceramic) in parallel with a 0.1 µF ceramic placed within 5 mm of the AVDD pin. Reference decoupling on REF IN+ and REF IN- should use 0.1 µF ceramics close to each pin. Use the SYNC/PDWN pin to duty-cycle the ADC between conversions - dropping supply current from 75 µA to 1 µA - to extend battery life in portable applications.
Partition the PCB into analog and digital grounds with a single star-ground tie near the AD7787BRM-REEL's GND pin (pin 5). Route the analog input traces (AIN1+, AIN1-) as a differential pair with matched length and guard trace, and keep digital SPI traces (SCLK, DOUT, DIN, SYNC) separated from analog traces to minimise digital coupling into the sensor signal. Place reference and supply decoupling on the same ground plane side as the analog inputs.
Do not exceed 5.25 V on AVDD or apply signals to AIN1+/AIN1- before power is applied, as this can cause latch-up. The REF IN- pin must NOT be left floating - tie it to GND or to the low side of an external reference. When using the buffered input mode, ensure source impedance is below 10 kohm to avoid gain errors; for high-impedance sensors, use the unbuffered mode with an external op-amp driver.
Use simultaneous 50 Hz and 60 Hz rejection by selecting the 16.7 Hz update rate (CHOP = enabled) for global deployments with mixed mains frequencies. For best noise performance at 9.5 Hz update rate, disable the digital filter chop and use shielded twisted-pair cabling for the analog inputs. Keep the DOUT/RDY trace short (< 50 mm) to avoid ringing on the SPI bus, and use a 100 kohm pull-up on DOUT/RDY if the host MCU does not provide one internally.
Compliance Information
RoHS compliant per Analog Devices product page (BRM suffix = Pb-free matte-tin). Not AEC-Q100 qualified - this part targets industrial, instrumentation, and consumer applications rather than automotive. REACH status not explicitly stated in the verified data - marked unknown. Conflict minerals declaration available from Analog Devices corporate compliance.
