Part A
AD7175-2BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5632 Stückzahl
- Package
- TSSOP-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7172-2BRUZ and AD7175-2BRUZ share the same TSSOP-24 package, 24-bit sigma-delta architecture, and SPI interface, making them functionally interchangeable in many designs. However, the AD7175-2BRUZ offers a significantly higher output data rate and faster settling time, while the AD7172-2BRUZ provides lower power consumption. Designers should validate power budget and timing requirements before substituting one for the other.
Package Type
High match
Resolution
High match
Output Data Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD7172-2BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6204 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 | AD7172-2BRUZ | AD7175-2BRUZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit sigma-delta ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 2 differential / 4 single-ended | 2 differential / 4 single-ended | Channel count determines how many sensor inputs can be multiplexed without external switching. |
| Maximum output data rate | 31.25 kSPS | 250 kSPS | The AD7175-2 supports much higher throughput, enabling faster sampling in high-speed acquisition systems. |
| RMS noise (at 10 SPS, gain=1) | Approximately 1.5 uV | Approximately 0.9 uV | Lower RMS noise improves effective resolution for low-level signal measurement. |
| INL (integral nonlinearity) | ±3 ppm typical | ±2 ppm typical | Better linearity reduces measurement error across the input range, affecting accuracy-critical designs. |
| Supply voltage (AVDD) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical analog supply range allows the same power rail design for either part. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Matching serial interfaces mean the same host microcontroller connections can be reused. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Same package and pinout simplify board-level drop-in substitution. |
| Typical supply current | Approximately 1.5 mA | Approximately 4.5 mA | Lower current draw in the AD7172-2 benefits power-sensitive, battery-operated designs. |
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 | AD7175-2BRUZ | AD7172-2BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 250k | 31.25k |
| Number of Inputs | 2, 4 | 2, 4 |
| Input Type | Differential, Pseudo-Differential, Single Ended | 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 | 2V ~ 5.5V | 2V ~ 5.5V |
| Voltage - Supply, Digital | 2V ~ 5.5V | 2V ~ 5.5V |
| Features | Temperature Sensor | - |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key architectural differences between the AD7172-2BRUZ and AD7175-2BRUZ?
Both are 24-bit sigma-delta ADCs in a 24-lead TSSOP (RUZ) package, but they differ in speed and channel count. The AD7172-2 is a 2-channel (2 differential/4 single-ended) ADC with a maximum output data rate of 31.25 kSPS, while the AD7175-2 is a 2-channel (2 differential/4 single-ended) ADC with a maximum output data rate of 250 kSPS. The AD7175-2 also offers a wider signal bandwidth and faster settling, making it better suited for higher-speed multiplexed applications.
Are the AD7172-2BRUZ and AD7175-2BRUZ pin-compatible?
Yes. Both devices are offered in the same 24-lead TSSOP (RUZ) package and share a compatible pinout, which allows the AD7175-2 to be used as a higher-speed drop-in upgrade for the AD7172-2 in many designs. However, firmware and register settings must be reviewed because the two parts have different output data rate ranges and filter configurations.
How do the maximum output data rates compare?
The AD7172-2 supports output data rates up to 31.25 kSPS, whereas the AD7175-2 supports output data rates up to 250 kSPS. The higher rate of the AD7175-2 enables faster channel scanning and shorter settling times in multiplexed systems.
Do both parts offer the same number of input channels?
Yes. Both the AD7172-2 and AD7175-2 provide 2 differential or 4 single-ended inputs, configurable through their input multiplexers. This makes them suitable for similar low-channel-count precision measurement applications.
What are the RMS noise and resolution characteristics of each device?
Both are 24-bit sigma-delta ADCs with low noise floors. The AD7172-2 achieves approximately 1.5 µV RMS noise at lower output data rates, while the AD7175-2 achieves approximately 1.5 µV RMS noise at similar rates but maintains low noise at much higher output data rates. For exact noise specifications at specific data rates and filter settings, refer to the respective manufacturer datasheets.
Which device is better for high-speed multiplexed applications?
The AD7175-2BRUZ is better suited for high-speed multiplexed applications because its maximum output data rate of 250 kSPS and faster settling allow quicker channel-to-channel switching while maintaining accuracy. The AD7172-2BRUZ, with a 31.25 kSPS maximum rate, is more appropriate for lower-speed, high-resolution measurements.
Do both devices support the same digital interface and supply voltages?
Yes. Both the AD7172-2 and AD7175-2 support an SPI-compatible serial interface and operate from an analog supply of 2.7 V to 5.5 V and a digital supply of 2.7 V to 5.5 V. This common interface and supply range simplifies migration between the two parts.
Can the AD7175-2BRUZ directly replace the AD7172-2BRUZ in an existing design?
In many cases yes, because both share the same 24-lead TSSOP package and pinout. However, a direct replacement requires verifying that the higher maximum output data rate, different filter register settings, and timing characteristics of the AD7175-2 are compatible with the existing firmware and signal chain. Always validate against the manufacturer datasheets before substitution.