Part A
AD7177-2BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4349 Stückzahl
- Package
- TSSOP-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7177-2BRUZ is a viable functional upgrade candidate for the AD7175-2BRUZ, sharing an identical TSSOP-24 footprint, pinout, and 5 V supply architecture while delivering higher resolution and faster output data rates. Designers must validate firmware configuration for the increased 32-bit resolution and confirm the output data rate settings, but no PCB redesign is required for substitution.
Package and Pinout
High match
Supply Voltage Range
High match
Resolution and Output Data Rate
Validation required
Interface Type
High match
Parts at a glance
Part B
AD7175-2BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5632 Stückzahl
- Package
- TSSOP-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7175-2BRUZ | AD7177-2BRUZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 32 | Higher resolution enables finer measurement granularity and lower noise floor, which is critical for precision sensing applications. |
| Output Data Rate (max) | 250 kSPS | 10 kSPS | Maximum throughput determines how fast signals can be sampled; a faster rate suits high-speed acquisition, while a slower rate trades speed for resolution. |
| RMS Noise | 2.5 µV RMS at 250 kSPS (typical) | 0.5 µV RMS at 10 kSPS (typical) | Lower RMS noise improves effective resolution and measurement accuracy for low-level signals. |
| Number of Input Channels | 2 differential / 4 single-ended | 2 differential / 4 single-ended | Channel count determines how many sensors or signal sources can be connected without external multiplexing. |
| Interface | SPI | SPI | The digital interface must match the host controller; both use SPI, so bus compatibility is preserved. |
| Supply Voltage (analog) | 4.5 V to 5.5 V (AVDD1), 2.0 V to 5.5 V (AVDD2) | 4.5 V to 5.5 V (AVDD1), 2.0 V to 5.5 V (AVDD2) | Supply requirements affect power supply design and compatibility with existing rails in a system. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Package footprint and pinout determine whether a part can be dropped into an existing PCB layout. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Temperature range must cover the application environment for reliable operation. |
| Power Consumption | Approx. 24 mW (typical) | Approx. 30 mW (typical) | Power consumption impacts thermal design and battery life in portable or low-power systems. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7177-2BRUZ | AD7175-2BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 32 | 24 |
| Sampling Rate(Per Second) | 10k | 250k |
| Number of Inputs | 2, 4 | 2, 4 |
| Input Type | Differential, Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.5V ~ 5.5V | 2V ~ 5.5V |
| Voltage - Supply, Digital | 2.5V ~ 5.5V | 2V ~ 5.5V |
| Features | Temperature Sensor | Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the primary differences between the AD7175-2BRUZ and AD7177-2BRUZ?
The AD7175-2BRUZ is a 24-bit, 2-channel sigma-delta ADC offering output rates up to 250 kSPS, while the AD7177-2BRUZ is a 32-bit, 2-channel sigma-delta ADC with output rates up to 10 kSPS. The AD7177-2BRUZ provides higher resolution (32-bit) but at a lower maximum output data rate compared to the AD7175-2BRUZ.
Are the AD7175-2BRUZ and AD7177-2BRUZ pin-compatible?
Yes, both devices are offered in the same 24-lead TSSOP (RU-24) package and share a compatible pinout, allowing them to be used on the same PCB layout. However, firmware and register configuration must be adjusted because the two devices have different resolution, output data rate ranges, and register maps.
What is the maximum output data rate of each device?
The AD7175-2BRUZ supports output data rates up to 250 kSPS. The AD7177-2BRUZ supports output data rates up to 10 kSPS. The higher throughput of the AD7175-2BRUZ makes it suitable for faster multiplexed or multi-channel acquisition, while the AD7177-2BRUZ targets high-resolution, lower-speed precision measurements.
What resolution does each ADC provide?
The AD7175-2BRUZ is a 24-bit sigma-delta ADC. The AD7177-2BRUZ is a 32-bit sigma-delta ADC. The AD7177-2BRUZ offers higher nominal resolution, which benefits low-noise, high-dynamic-range applications such as precision instrumentation and weigh scales.
Do both devices support the same digital interface?
Yes, both the AD7175-2BRUZ and AD7177-2BRUZ provide an SPI-compatible serial interface for register configuration and data readback. The interface supports daisy-chain and multiple-device configurations, but the register maps and configuration settings differ between the two parts.
Can the AD7177-2BRUZ be used as a drop-in replacement for the AD7175-2BRUZ?
Hardware-wise, the shared 24-lead TSSOP package and compatible pinout allow the AD7177-2BRUZ to be placed on the same footprint. However, it is not a firmware drop-in replacement: the maximum output data rate drops from 250 kSPS to 10 kSPS, resolution changes from 24-bit to 32-bit, and register configuration must be updated per the respective datasheets. System timing and throughput requirements must be revalidated.
Which device is better suited for high-speed multi-channel data acquisition?
The AD7175-2BRUZ is better suited for high-speed multi-channel acquisition because its maximum output data rate of 250 kSPS is significantly higher than the 10 kSPS limit of the AD7177-2BRUZ. Faster settling and throughput allow more channels to be scanned per unit time within a given accuracy budget.
Which device is better suited for ultra-high-resolution precision measurement?
The AD7177-2BRUZ is better suited for ultra-high-resolution precision measurement because it provides 32-bit resolution, compared with 24-bit resolution on the AD7175-2BRUZ. Applications such as precision weigh scales, chromatography, and low-frequency sensor interfaces benefit from the higher resolution, provided the lower 10 kSPS maximum output rate is acceptable.