Part A
AD7997BRUZ-0
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3591 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7997BRUZ-0 and AD7994BRU-0 are both 4-channel, 12-bit successive-approximation ADCs from the same Analog Devices family, sharing an I²C-compatible serial interface and a comparable TSSOP-16 footprint. The AD7997BRUZ-0 offers a faster 188 kSPS conversion rate versus 105 kSPS on the AD7994BRU-0, and the AD7994BRU-0 provides two single-ended/four pseudo-differential input configurations versus four single-ended inputs on the AD7997BRUZ-0. Because the core resolution, channel count, interface, and package align, the AD7997BRUZ-0 is a viable functional replacement candidate for the AD7994BRU-0, provided the higher sample rate is acceptable and the input configuration difference is validated against the target application.
Resolution and Channel Count
High match
Package Type
High match
Input Configuration
Validation required
Sample Rate
High match
Parts at a glance
Part B
AD7994BRU-0
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5968 Stückzahl
- Package
- TSSOP-16
- 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 | AD7997BRUZ-0 | AD7994BRU-0 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Higher resolution provides finer measurement granularity; a 12-bit ADC resolves 4x more levels than a 10-bit ADC, affecting measurement accuracy. |
| Number of Input Channels | 8 channels | 4 channels | Determines how many analog signals can be monitored; the 8-channel device supports twice as many inputs as the 4-channel device. |
| Sampling Rate | 188 kSPS | 188 kSPS | Sets the maximum conversion throughput; identical rates mean both can capture signals at the same speed. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; matching ranges allow either part to work in the same power supply design. |
| Interface Type | I2C (2-wire) | I2C (2-wire) | Determines the digital communication protocol; identical I2C interfaces allow drop-in compatibility with the same host bus. |
| Package / Mounting | 16-lead TSSOP | 16-lead TSSOP | Affects PCB footprint and assembly; identical packages permit the same board layout for either device. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines environmental limits; matching ranges ensure both parts suit the same application environments. |
| Input Type | Single-ended | Single-ended | Specifies how signals are referenced; both use single-ended inputs, so signal conditioning requirements are the same. |
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 | AD7997BRUZ-0 | AD7994BRU-0 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 188k | 188k |
| Number of Inputs | 8 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | I²C | I²C |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7997BRUZ-0 and AD7994BRU-0?
The AD7997BRUZ-0 is an 8-channel, 10-bit successive-approximation ADC with an I2C-compatible interface, housed in a 20-lead TSSOP (RU-20) package and specified for operation from -40°C to +85°C. The AD7994BRU-0 is a 4-channel, 12-bit ADC of the same family, also in a 20-lead TSSOP package with an I2C-compatible interface. The primary differences are resolution (10-bit vs 12-bit) and the number of analog input channels (8 vs 4).
Are the AD7997BRUZ-0 and AD7994BRU-0 pin-compatible?
Both devices are offered in the same 20-lead TSSOP (RU-20) package, but they are not functionally interchangeable because the AD7997 provides eight analog inputs while the AD7994 provides four, and their resolutions differ (10-bit vs 12-bit). Pin function assignments should be verified against the respective manufacturer datasheets before considering any board-level substitution.
What is the resolution and channel count of each device?
The AD7997BRUZ-0 provides 10-bit resolution with 8 analog input channels. The AD7994BRU-0 provides 12-bit resolution with 4 analog input channels. Both are successive-approximation register (SAR) ADCs with I2C-compatible serial interfaces.
What supply voltage and interface do these ADCs use?
Both the AD7997 and AD7994 are specified for a single-supply range of 2.7 V to 5.5 V and communicate over an I2C-compatible 2-wire serial interface. Designers should confirm the exact timing and voltage-level requirements in the respective datasheets for the target system.
Can the AD7994BRU-0 directly replace the AD7997BRUZ-0 in an existing design?
Not without validation. Although both are 20-lead TSSOP devices in the same ADC family, the AD7994 offers 12-bit resolution on 4 channels while the AD7997 offers 10-bit resolution on 8 channels. Channel count, resolution, and register/command-set behavior differ, so firmware and PCB routing must be reviewed against the manufacturer datasheets before substitution.
What are the operating temperature ranges for these parts?
Both the AD7997BRUZ-0 and AD7994BRU-0 are specified for the industrial temperature range of -40°C to +85°C. The "B" grade designation in the part number corresponds to this temperature and performance grade.
Which device should be selected for higher-precision measurements?
The AD7994BRU-0 should be selected when higher precision is required, since it provides 12-bit resolution versus the 10-bit resolution of the AD7997BRUZ-0. The AD7997BRUZ-0 is preferable when a larger number of analog input channels (8 vs 4) is needed at 10-bit resolution.