Part A
AD7792BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4535 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7793BRUZ and AD7792BRU are pin-compatible 24-bit sigma-delta ADCs from the same family, sharing identical TSSOP-16 packaging, SPI interface, and supply architecture. The AD7793BRUZ offers a higher maximum output data rate (470 SPS vs 123 SPS) and an integrated programmable current source, making it a functional superset of the AD7792BRU. Designers should verify application-specific requirements for output data rate and excitation current before substituting, but the AD7793BRUZ is a viable functional replacement candidate for the AD7792BRU in most precision measurement designs.
Package Type
High match
Resolution
High match
Output Data Rate
Validation required
Integrated Current Source
Validation required
Parts at a glance
Part B
AD7793BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5584 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - 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 | AD7793BRUZ | AD7792BRU | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Higher resolution enables finer measurement of small signal changes; a 24-bit ADC resolves much smaller increments than a 16-bit ADC, directly affecting precision in low-level sensor applications. |
| Number of ADC Input Channels | 3 differential | 3 differential | Channel count determines how many independent sensor inputs can be measured; both offer three differential channels, so input flexibility is equivalent. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | The serial interface must match the host microcontroller; identical interfaces mean either part can drop into the same digital bus without firmware changes. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with the system power rail; matching ranges allow the same power design to be reused. |
| Package / Mounting | 16-TSSOP (surface mount) | 16-TSSOP (surface mount) | Package and footprint must match for board-level substitution; identical TSSOP packages allow direct drop-in replacement without PCB redesign. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Temperature range affects suitability for industrial and outdoor environments; matching ranges ensure equivalent environmental robustness. |
| Integrated PGA | Yes (gain 1 to 128) | Yes (gain 1 to 128) | An integrated programmable gain amplifier allows direct connection of low-level sensors without external amplification, simplifying the signal chain identically for both parts. |
| Internal Reference | Yes | Yes | An on-chip voltage reference reduces external component count and board space; both parts include one, so reference design effort is the same. |
| Output Data Rate (max) | 470 SPS | 470 SPS | Maximum output data rate sets the achievable sampling speed for dynamic signals; identical rates mean equivalent throughput for both devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7792BRU | AD7793BRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Base Product Number | AD7792 | - |
| Number of Bits | 16 | 24 |
| Sampling Rate (Per Second) | 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 | - |
| 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 |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Sampling Rate(Per Second) | - | 470 |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the primary differences between the AD7793BRUZ and the AD7792BRU?
The AD7793BRUZ is a 24-bit sigma-delta ADC, while the AD7792BRU is a 16-bit sigma-delta ADC. Both are pin-compatible, low-power, 3-channel devices in a 16-lead TSSOP package, but they differ in resolution and performance specifications. The AD7793 offers higher resolution and lower noise, while the AD7792 provides 16-bit resolution at a lower cost.
Are the AD7793BRUZ and AD7792BRU pin-compatible and package-compatible?
Yes. Both devices are offered in the same 16-lead TSSOP (RU-16) package and share an identical pinout, allowing the AD7792BRU to be used as a drop-in replacement for the AD7793BRUZ on the same PCB footprint, provided the system resolution requirements are met.
What is the resolution and output data rate of each device?
The AD7793BRUZ provides 24-bit resolution with output data rates programmable from 4.17 Hz to 470 Hz. The AD7792BRU provides 16-bit resolution with the same programmable output data rate range of 4.17 Hz to 470 Hz. Both use a sigma-delta architecture with programmable gain.
Do both parts support the same PGA gain settings and input channels?
Yes. Both the AD7793BRUZ and AD7792BRU feature three differential input channels and a programmable gain amplifier with gain settings of 1, 2, 4, 8, 16, 32, 64, and 128. Both also include an internal reference, a programmable current source for RTD excitation, and a burnout current source.
What are the supply voltage and power consumption specifications for these ADCs?
Both devices operate from a single supply of 2.7 V to 5.25 V and are specified for low-power operation. The AD7793BRUZ typically consumes about 400 µA in continuous conversion mode, while the AD7792BRU consumes approximately 350 µA. Both support power-down modes that reduce current to a few microamperes.
Can the AD7792BRU be used in place of the AD7793BRUZ in an existing design?
Because the two devices are pin-compatible and share the same register map and interface, the AD7792BRU can physically replace the AD7793BRUZ. However, the system must be revalidated because the AD7792 provides only 16-bit resolution versus 24-bit, which reduces effective resolution and noise performance. Applications requiring high-precision measurement should retain the AD7793BRUZ.
What communication interface do the AD7793BRUZ and AD7792BRU use?
Both devices use a 3-wire SPI-compatible serial interface supporting clock frequencies up to 5 MHz. The interface is used for register configuration, reading conversion data, and controlling calibration and power modes. Both parts also feature a data-ready (RDY) output pin.
Do both parts include internal calibration and an internal reference?
Yes. Both the AD7793BRUZ and AD7792BRU include an internal 1.17 V reference and support internal zero-scale and full-scale calibration as well as system calibration. This allows compensation for offset and gain errors without external calibration hardware.