AD7177-2BRUZ - 32-Bit Sigma-Delta ADC 10kSPS | Analog Devices
MPN: AD7177-2BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $26.25 | $26.25 |
| 10 | $24.6 | $246.00 |
| 100 | $22.8 | $2,280.00 |
| 500 | $21.3 | $10,650.00 |
| 1,000 | $19.84 | $19,840.00 |
AD7177-2BRUZ Overview
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital numbers for digital processing. The AD7177-2 is a sigma-delta ADC, which uses oversampling and digital noise shaping to achieve very high resolution. Within the data-converter hierarchy it occupies the high-resolution, low-speed end, complementing faster SAR ADCs, and belongs to Analog Devices' AD717x precision ADC family optimized for low-speed, high-accuracy acquisition of physical quantities such as temperature, pressure, and strain.
Key features include 32-bit resolution, a 10 kSPS output data rate, 100 us settling time for fast channel switching, and true rail-to-rail buffers on both analog and reference inputs, providing easy-to-drive high-impedance inputs. It operates from a 2.5 V to 5.5 V supply and offers a flexible SPI-compatible serial interface for microcontrollers and DSPs. Two fully differential or four pseudo-differential input channels are supported, each with independently configurable setup.
Technically, the AD7177-2 employs a sigma-delta modulator with programmable digital filters, achieving extremely low noise. An integrated low-drift reference and internal oscillator reduce external component count. Per-channel configuration allows different gains, filter types, and reference selections per input, while built-in diagnostics continuously monitor supply and reference integrity for reliable operation in safety-conscious systems.
Typical applications include process control, industrial automation, weigh scales, temperature and pressure measurement, and medical instrumentation, where the 32-bit noise-free resolution and fast 100 us settling enable efficient multiplexed data acquisition.
When designing with the AD7177-2BRUZ, properly decouple AVDD and DVDD, use a clean analog ground plane, and drive the reference inputs from a low-impedance source; isolate the SPI bus in noisy environments to prevent digital noise coupling.
Drop-in alternatives for AD7177-2BRUZ — 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 (same form factor and footprint) — differing in Number of Channels, Package, Input Type, Sampling Rate, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7176-2BRUZ
✅ Drop-In✓ In Stock
$9.5 / Unit
View Datasheet →AD7175-2BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.62 / Unit
View Datasheet →AD7173-8BRUZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7172-2BRUZ
✅ Drop-In✓ In Stock
$8.64 / Unit
View Datasheet →AD7172-4BRUZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7177-2BRUZ-RL7
✅ Drop-In✓ In Stock
$17.8 / Unit
View Datasheet →AD7177-2BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 32 bit |
| Number of Channels | 2 differential / 4 pseudo-differential |
| Sampling Rate | 10 kSPS |
| Architecture | Sigma-Delta |
| Settling Time | 100 us |
| Input Buffers | True rail-to-rail on analog and reference inputs |
| Supply Voltage | 2.5 V to 5.5 V |
| Interface | SPI-compatible serial |
| Internal Reference | Yes, low noise low drift |
| Digital Filters | sinc5+sinc1, sinc3, fast settling, enhanced 50/60 Hz rejection |
| Per-Channel Configuration | Independent setup per channel (gain, filter, reference) |
| Package | 24-TSSOP |
| Mounting Type | Surface Mount |
| Diagnostics | Supply and reference monitoring |
| RoHS Status | Compliant |
AD7177-2BRUZ Pin Configuration
| Pin 1 | AIN0 — Analog input 0 (positive differential input) |
| Pin 2 | AIN1 — Analog input 1 (negative differential input / pseudo-differential) |
| Pin 3 | AIN2 — Analog input 2 |
| Pin 4 | AIN3 — Analog input 3 |
| Pin 5 | REF+ — External reference positive input (buffered) |
| Pin 6 | REF- — External reference negative input (buffered) |
| Pin 7 | AVDD1 — Analog supply 2.5 V to 5.5 V |
| Pin 12 | GND — Ground reference |
| Pin 17 | SCLK — SPI serial clock input |
| Pin 18 | DIN — SPI serial data input |
| Pin 19 | DOUT/RDY — SPI serial data output / data ready indicator |
| Pin 20 | CS — SPI chip select |
| Pin 21 | SYNC — Synchronization input for multiple ADCs |
| Pin 22 | DVDD — Digital supply |
| Pin 23 | REGCAP — Internal regulator decoupling capacitor |
| Pin 24 | ERROR — Diagnostic error flag output |
Typical Applications
AD7177-2BRUZ is suitable for 6 applications: Precision Weigh Scales, Industrial Process Control, Temperature Measurement (RTD/Thermocouple), Medical Instrumentation, Laboratory Data Acquisition, Smart Energy Metering.
Precision Weigh Scales
The AD7177-2BRUZ fits weigh-scale designs because its 32-bit resolution and low noise resolve microvolt-level load-cell bridge signals, and true rail-to-rail input buffers tolerate high-impedance bridges without external conditioning. The enhanced 50/60 Hz line-rejection filters suppress mains interference in industrial floor scales. The 100 us settling supports fast checkweigher multiplexing across multiple load cells, and per-channel gain setup allows different bridge sensitivities on one ADC.
Recommended
Industrial Process Control
In process control, the AD7177-2BRUZ digitizes 4-20 mA loops, pressure transmitters, and RTD signals with 32-bit accuracy. Its rail-to-rail buffers accept high-impedance sensor sources directly, while 100 us settling enables scanning up to 4 pseudo-differential inputs rapidly. Built-in supply and reference diagnostics flag faults, supporting safe and reliable continuous operation in factory automation environments.
Recommended
Temperature Measurement (RTD/Thermocouple)
The AD7177-2BRUZ excels in RTD and thermocouple front ends: the low-noise 32-bit modulator resolves sub-degree temperature changes, and the low-drift internal reference eliminates one error source. Programmable digital filters provide enhanced 50/60 Hz rejection for long sensor leads, and per-channel setups allow mixing RTD excitation schemes and thermocouple channels on the same 24-TSSOP device.
Recommended
Medical Instrumentation
Medical analyzers and patient monitoring benefit from the AD7177-2BRUZ's 32-bit noise-free resolution and integrated diagnostics that continuously monitor supplies and reference. The 2.5 V to 5.5 V single supply simplifies portable battery designs, and true rail-to-rail buffered inputs connect directly to bio-sensor electrodes and photodiodes. Fast 100 us settling supports multiplexed multi-channel diagnostic acquisition paths.
Recommended
Laboratory Data Acquisition
Bench and automated test equipment use the AD7177-2BRUZ where 32-bit resolution and a 100 us settling time enable both high-precision DC measurement and rapid channel scanning. The SPI interface connects easily to MCU/DSP hosts, per-channel filter choices trade speed for noise as needed, and the Analog Devices EVAL-AD7177-2SDZ evaluation board accelerates system prototyping.
Recommended
Smart Energy Metering
The AD7177-2BRUZ supports high-accuracy energy metering: enhanced 50/60 Hz rejection filters remove mains harmonics, the 32-bit modulator provides the dynamic range for wide-current-range shunt sensing, and rail-to-rail reference buffers allow ratiometric measurement against the meter reference. Diagnostics monitor supply integrity, supporting regulatory accuracy and reliability requirements over the meter lifetime.
Recommended
Recommended Products Summary
Engineering reference data for AD7177-2BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7176-2BRUZ | AD7175-2BRUZ | AD7172-2BRUZ | AD7173-8BRUZ |
|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 32 bit | 24 bit | 24 bit | 24 bit | 24 bit |
| Max Output Data Rate | 10 kSPS | 250 kSPS | 250 kSPS | 15.62 kSPS | 250 kSPS |
| Input Channels | 2 differential / 4 pseudo-diff | 2 differential / 4 pseudo-diff | 2 differential / 4 pseudo-diff | 2 differential / 4 pseudo-diff | 8 differential / 16 pseudo-diff |
| Power Positioning | Precision flagship (32-bit) | High speed 24-bit | General purpose 24-bit | Lower power 24-bit | High channel count 24-bit |
Key Differentiators
- Highest resolution in the pin-compatible AD717x 24-TSSOP family (vs AD7176-2BRUZ)
- Fast 100 us settling despite 32-bit resolution (vs AD7172-2BRUZ)
- Trade-off: slower max data rate for higher resolution (vs AD7176-2BRUZ)
Design Notes
Decouple AVDD and DVDD with 100 nF ceramic capacitors placed as close to the pins as possible, plus 10 uF bulk capacitance per rail. The REGCAP pin requires its datasheet-specified capacitor for the internal regulator - do not omit it. Keep the analog and digital supply domains referenced to a single clean ground plane to minimize ground bounce coupling into the sigma-delta modulator.
Use a solid analog ground plane under the ADC and keep the reference routing short and symmetrical. Drive REF+/REF- from a low-impedance, low-noise source; although the reference inputs are rail-to-rail buffered, reference noise translates directly to output noise at 32-bit sensitivity. Star-route sensor signals away from SPI clock lines to prevent digital coupling into analog inputs.
Do not exceed the 10 kSPS output data rate - higher family members (AD7175-2/AD7176-2) are needed above this rate. At 32-bit resolution, output data is effectively noise-limited below the maximum rate; consult the noise tables in the AD7177-2 datasheet (Rev. B) for resolution-vs-data-rate trade-offs rather than assuming full 32 bits are noise-free at all settings.
Compliance Information
RoHS compliant per distributor listings. REACH and halogen-free status not stated in provided data - verify on Analog Devices product page.
