AD7177-2BRUZ-RL7 - 32-Bit Sigma-Delta ADC | Analog Devices
MPN: AD7177-2BRUZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $26.25 | $26.25 |
| 10 | $24.1 | $241.00 |
| 100 | $21.5 | $2,150.00 |
| 500 | $19.2 | $9,600.00 |
| 1,000 | $17.8 | $17,800.00 |
AD7177-2BRUZ-RL7 Overview
A sigma-delta ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution. It is part of the data converter family, which includes successive approximation register (SAR) ADCs and pipeline ADCs. Sigma-delta ADCs are known for their excellent linearity and low noise, making them ideal for precision measurement applications. The AD7177-2 is a high-performance member of this family, offering 32-bit resolution and fast settling, which is particularly useful in multiplexed systems where multiple channels need to be scanned quickly.
Key features of the AD7177-2 include integrated true rail-to-rail buffers on the analog inputs and external reference inputs, providing easy-to-drive high impedance inputs. It also offers 85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling, making it suitable for industrial power line noise environments. The device supports a fully differential reference input applied through the REF+ and REF− pins, and standard low noise, low drift voltage references such as the ADR445, ADR444, and ADR441 are recommended.
The AD7177-2 uses a sigma-delta modulator with a digital filter, achieving high resolution and low noise. The device includes a multiplexer, buffer, and programmable gain amplifier (PGA) on-chip, simplifying the signal chain. The digital filter can be configured for various output data rates and settling times, allowing trade-offs between speed and noise performance. The device also features a serial peripheral interface (SPI) for communication with microcontrollers or DSPs.
Typical applications include process control, industrial automation, medical instrumentation, and precision measurement systems. The AD7177-2 is particularly well-suited for applications requiring high resolution and fast channel scanning, such as data acquisition systems and weigh scales. Its low noise performance and fast settling make it ideal for multiplexed sensor arrays.
When designing with the AD7177-2, it is important to provide a clean, low-noise power supply and a stable reference voltage. The analog and digital supplies should be decoupled with appropriate capacitors, and the reference inputs should be driven by a low-impedance source. The SPI interface should be properly terminated to avoid signal integrity issues.
Drop-in alternatives for AD7177-2BRUZ-RL7 — 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 AD7177-2BRUZ-RL7 (same form factor and footprint) — differing in Settling Time, Reference Type, Package, Resolution, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7177-2BRUZ
✅ Drop-In✓ In Stock
$19.84 / Unit
View Datasheet →AD7176-2BRUZ
✅ Drop-In✓ In Stock
$9.5 / Unit
View Datasheet →AD7172-2BRUZ
✅ Drop-In✓ In Stock
$8.64 / Unit
View Datasheet →AD7175-2BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.62 / Unit
View Datasheet →ADS131M04IPWR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7177-2BRUZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 32 Bit |
| Number of Channels | 2, 4 Input |
| Input Type | Fully/Pseudo Differential |
| Data Interface | SPI (3-Wire, 4-Wire) |
| Sampling Rate | 10 kSPS (max) |
| Output Data Rate Range | 5 SPS to 10 kSPS |
| Settling Time | 100 µs (fully settled) |
| Filter Rejection | 85 dB at 50 Hz and 60 Hz |
| Reference Type | External, Differential |
| Architecture | Sigma-Delta |
| Number of A/D Converters | 1 |
| Package | 24-TSSOP |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +105°C (industrial) |
| RoHS Status | Compliant |
AD7177-2BRUZ-RL7 Pin Configuration
| Pin 1 | AVDD — Analog power supply |
| Pin 2 | AIN0 — Analog input 0 |
| Pin 3 | AIN1 — Analog input 1 |
| Pin 4 | AIN2 — Analog input 2 |
| Pin 5 | AIN3 — Analog input 3 |
| Pin 6 | REF+ — Positive reference input |
| Pin 7 | REF- — Negative reference input |
| Pin 8 | AVSS — Analog ground |
| Pin 9 | DVDD — Digital power supply |
| Pin 10 | DGND — Digital ground |
| Pin 11 | SCLK — Serial clock input |
| Pin 12 | DIN — Serial data input |
| Pin 13 | DOUT — Serial data output |
| Pin 14 | CS — Chip select (active low) |
| Pin 15 | SYNC — Synchronization input |
| Pin 16 | RESET — Reset input (active low) |
| Pin 17 | GPIO0 — General purpose I/O |
| Pin 18 | GPIO1 — General purpose I/O |
| Pin 19 | GPIO2 — General purpose I/O |
| Pin 20 | GPIO3 — General purpose I/O |
| Pin 21 | AVDD — Analog power supply |
| Pin 22 | AVSS — Analog ground |
| Pin 23 | DVDD — Digital power supply |
| Pin 24 | DGND — Digital ground |
Typical Applications
AD7177-2BRUZ-RL7 is suitable for 6 applications: Process Control, Industrial Automation, Medical Instrumentation, Precision Measurement Systems, Data Acquisition Systems, Weigh Scales.
Process Control
The AD7177-2BRUZ-RL7's 32-bit resolution and 10 kSPS scan rate enable precise monitoring of industrial process variables such as temperature, pressure, and flow. Its 85 dB filter rejection at 50/60 Hz ensures accurate readings in noisy industrial environments. The device's fast settling (100 µs) allows rapid multiplexing of multiple sensor channels, improving system throughput. Integrated rail-to-rail buffers simplify interfacing to sensors with high output impedance. This makes it ideal for PLCs and distributed control systems where accuracy and speed are critical.
Recommended
Industrial Automation
In industrial automation, the AD7177-2BRUZ-RL7 provides high-resolution data acquisition for robotic control, motor monitoring, and quality inspection. Its 32-bit resolution captures fine details in sensor signals, while the 10 kSPS scan rate supports real-time control loops. The device's SPI interface allows easy integration with microcontrollers and PLCs. The 85 dB filter rejection at 50/60 Hz minimizes power line interference, ensuring reliable operation in factory environments. The 24-TSSOP package is compact for space-constrained control boards.
Recommended
Medical Instrumentation
The AD7177-2BRUZ-RL7 is well-suited for medical devices such as patient monitors, diagnostic equipment, and laboratory analyzers. Its 32-bit resolution ensures accurate measurement of physiological signals like ECG, EEG, and blood pressure. The low noise performance and fast settling enable precise multiplexed readings from multiple sensors. The device operates over the industrial temperature range, making it suitable for medical equipment used in various environments. Its small 24-TSSOP package fits portable and wearable medical devices.
Recommended
Precision Measurement Systems
For precision measurement systems like weigh scales, strain gauge readers, and scientific instruments, the AD7177-2BRUZ-RL7 offers 32-bit resolution and 100 µs settling, enabling accurate and fast readings. Its integrated buffers and PGA simplify the signal chain, reducing external component count. The device's SPI interface allows easy configuration of output data rates and filter settings. The 85 dB filter rejection at 50/60 Hz ensures stable measurements in environments with power line noise. This makes it ideal for laboratory and metrology applications.
Recommended
Data Acquisition Systems
The AD7177-2BRUZ-RL7 is a key component in data acquisition systems (DAQ) for capturing high-resolution analog signals. Its 32-bit resolution and 10 kSPS scan rate allow digitization of multiple channels with high accuracy. The device's fast settling time (100 µs) enables rapid channel scanning, making it suitable for dynamic signal analysis. The SPI interface simplifies connection to DSPs or FPGAs. The integrated buffers and PGA reduce external circuitry, saving board space. This makes it ideal for portable DAQ modules and benchtop instruments.
Recommended
Weigh Scales
In weigh scale applications, the AD7177-2BRUZ-RL7 provides the high resolution and low noise required for accurate weight measurements. Its 32-bit resolution allows detection of small weight changes, while the 100 µs settling time supports fast updates. The device's integrated PGA and buffers interface directly with load cells, simplifying the analog front-end. The 85 dB filter rejection at 50/60 Hz ensures stable readings in industrial environments. The 24-TSSOP package is suitable for compact scale electronics.
Recommended
Recommended Products Summary
Engineering reference data for AD7177-2BRUZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7177-2BRUZ | AD7176-2BRUZ | AD7172-2BRUZ | AD7175-2BRUZ | ADS131M04IPWR |
|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 32 Bit | 32 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit |
| Max Sampling Rate | 10 kSPS | 10 kSPS | 250 kSPS | 31.25 kSPS | 250 kSPS | 32 kSPS |
| Settling Time | 100 µs | 100 µs | 4 µs | 32 µs | 4 µs | 31.25 µs |
| Input Channels | 2, 4 Input | 2, 4 Input | 2, 4 Input | 2, 4 Input | 2, 4 Input | 4 Input |
| Data Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Filter Rejection | 85 dB at 50/60 Hz | 85 dB at 50/60 Hz | 85 dB at 50/60 Hz | 85 dB at 50/60 Hz | 85 dB at 50/60 Hz | 90 dB at 50/60 Hz |
Key Differentiators
- 32-bit resolution (vs AD7176-2BRUZ)
- Fast settling time (vs AD7172-2BRUZ)
- Integrated buffers and PGA (vs ADS131M04IPWR)
Design Notes
Provide clean, low-noise power supplies for AVDD and DVDD. Use separate analog and digital supply rails with ferrite beads to isolate them. Decouple each supply pin with 10 µF and 0.1 µF capacitors placed close to the pins. A low-noise LDO such as the ADP151 is recommended for the analog supply.
Place the ADC close to the signal source to minimize trace length and noise pickup. Use a solid ground plane and avoid routing digital signals under the analog input traces. Keep the reference inputs (REF+ and REF-) away from digital switching noise. Follow the layout guidelines in the AD7177-2 datasheet (Rev. B) for optimal performance.
Ensure the reference voltage is stable and low-noise. Use a precision reference like the ADR445 or ADR444. Avoid driving the reference inputs with high-impedance sources. Also, ensure the SPI lines are properly terminated to prevent signal integrity issues. Incorrect configuration of the digital filter can lead to aliasing; set the output data rate appropriately for your signal bandwidth.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
