Part A
AD7793BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6887 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7792BRUZ and AD7793BRU are functionally compatible 16-bit and 24-bit sigma-delta ADCs from the same family, sharing an identical TSSOP-16 footprint, SPI interface, and pinout. The AD7793BRU offers higher resolution and is a viable functional upgrade candidate, though the resolution difference and minor gain drift specification must be validated against the target application requirements.
Resolution
High match
Package Type
High match
Interface Type
High match
Gain Drift
Validation required
Parts at a glance
Part B
AD7792BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6128 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7792BRUZ | AD7793BRU | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution enables finer measurement of small signal changes; the 24-bit AD7793 offers 8x more code resolution than the 16-bit AD7792. |
| Number of ADC Input Channels | 3 differential | 3 differential | Both provide three differential inputs, allowing similar multi-sensor configurations without redesigning the input multiplexing. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface compatibility means the same microcontroller firmware and bus wiring can be reused. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching analog supply ranges allow the same power rail design to be used for either part. |
| Package / Mounting | 16-TSSOP (surface mount) | 16-TSSOP (surface mount) | Identical package and footprint permit drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Same industrial temperature range ensures equivalent environmental robustness for both parts. |
| Integrated PGA Gain Range | 1 to 128 | 1 to 128 | Identical programmable gain amplifier settings support the same low-level sensor signal conditioning. |
| Internal Reference | Yes (internal band gap reference) | Yes (internal band gap reference) | Both include an internal reference, reducing external component count and simplifying ratiometric designs. |
| Output Data Rate (max) | 470 SPS | 470 SPS | Matching maximum output data rates mean equivalent throughput for the same sampling requirements. |
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 | AD7793BRU | AD7792BRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 24 | 16 |
| Sampling Rate(Per Second) | 470 | 470 |
| Number of Inputs | 3 | 3 |
| Input Type | Differential | Differential |
| 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 | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD7792BRUZ and AD7793BRU?
The AD7792 and AD7793 are both 16-bit/24-bit low-power sigma-delta ADCs, but the AD7793 integrates an internal reference and a programmable current source for RTD excitation, while the AD7792 requires an external reference and does not include the excitation current sources. The AD7792BRUZ is specified for 16-bit resolution, whereas the AD7793BRU is a 24-bit device. Both are offered in a 16-lead TSSOP package.
Are the AD7792BRUZ and AD7793BRU pin-compatible?
Yes. Both devices are housed in the same 16-lead TSSOP (RU-16) package and share the same pinout, allowing the AD7793BRU to be used in place of the AD7792BRUZ on an existing PCB layout when the additional internal reference and excitation current source features are acceptable.
What is the resolution difference between the AD7792BRUZ and AD7793BRU?
The AD7792BRUZ provides 16-bit resolution, while the AD7793BRU provides 24-bit resolution. The AD7793 therefore offers higher resolution for low-level signal measurement applications such as precision temperature and pressure sensing.
Does the AD7793BRU include an internal reference that the AD7792BRUZ lacks?
Yes. The AD7793BRU integrates an internal 1.17 V reference, whereas the AD7792BRUZ does not include an internal reference and requires an external reference voltage for operation. This difference affects system cost and board space in precision measurement designs.
Which device includes programmable excitation current sources for RTD applications?
The AD7793BRU includes two programmable excitation current sources suitable for directly exciting RTD sensors, while the AD7792BRUZ does not integrate these current sources. Designs using the AD7792BRUZ for RTD measurement must provide external excitation circuitry.
Do the AD7792BRUZ and AD7793BRU share the same supply voltage and interface?
Yes. Both devices operate from a single 2.7 V to 5.25 V supply and communicate over a serial SPI-compatible interface. They also share the same low-power sigma-delta architecture and similar digital filter and gain settings, which simplifies migration between the two parts.
Can the AD7793BRU be used as a drop-in replacement for the AD7792BRUZ in an existing design?
Because the two devices are pin-compatible and share the same package and interface, the AD7793BRU can generally serve as a drop-in replacement for the AD7792BRUZ. However, the designer must verify that the internal reference and excitation current source features of the AD7793BRU do not conflict with the existing external circuitry and that firmware settings for resolution and configuration registers are updated accordingly.