Part A
AD7790BRMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 1513 PCS
- Package
- MSOP-10
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7790BRMZ and AD7791BRM are both single-channel, 24-bit sigma-delta ADCs from Analog Devices in the same 10-lead MSOP package, sharing a closely related core architecture and SPI interface. The AD7791BRM offers a higher output data rate and a buffered differential input, making it a viable functional substitute for the AD7790BRM in many low-power precision measurement designs, provided the system can accommodate the differences in output data rate, input configuration, and supply range. Designers should validate these parameters against their specific application requirements before committing to the replacement.
Resolution and ADC Architecture
High match
Output Data Rate
Validation required
Input Configuration
Validation required
Package and Pinout
High match
Parts at a glance
Part B
AD7791BRM
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 8988 PCS
- Package
- MSOP-10
- Series
- 데이터 수집 - 아날로그 변환기(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 | AD7790BRMZ | AD7791BRM | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution enables finer measurement of small signal changes; the 24-bit AD7791 offers significantly better precision than the 16-bit AD7790. |
| Number of ADC Input Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Interface Type | SPI | SPI | Both use a serial SPI interface, allowing similar digital host connectivity and firmware compatibility. |
| Supply Voltage (min) | 2.7 V | 2.7 V | Identical minimum supply voltage means both can operate from the same low-voltage rails. |
| Supply Voltage (max) | 5.25 V | 5.25 V | Identical maximum supply voltage ensures both tolerate the same upper rail limits. |
| Package / Case | 10-TFSOP, 10-MSOP | 10-TFSOP, 10-MSOP | Same package footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Identical temperature range means both suit the same environmental conditions. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, compatible with the same assembly process. |
| Data Rate (max) | 120 SPS | 120 SPS | Identical maximum output data rate means comparable 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 | AD7790BRMZ | AD7791BRM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 24 |
| Sampling Rate(Per Second) | 120 | 120 |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.5V ~ 5.25V | 2.5V ~ 5.25V |
| Voltage - Supply, Digital | 2.5V ~ 5.25V | 2.5V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Features | PGA | - |
Frequently asked questions
What are the primary differences between the AD7790BRMZ and the AD7791BRM?
The AD7790BRMZ is a 16-bit sigma-delta ADC with a single differential input channel, while the AD7791BRM is a 24-bit sigma-delta ADC with a single differential input channel. Both are offered in a 10-lead MSOP package and operate from a 2.7 V to 5.25 V supply, but they differ in resolution, output data rate options, and power consumption specifications.
Are the AD7790BRMZ and AD7791BRM pin-compatible?
Yes. Both devices are specified in the same 10-lead MSOP (RM) package and share the same pinout, which allows a common PCB footprint. However, firmware and configuration settings must be adjusted because the two parts have different resolution and register/output data rate behavior.
What is the resolution and output data rate of each device?
The AD7790BRMZ provides 16-bit resolution with selectable output update rates of 16.7 Hz, 33.3 Hz, 50 Hz, 100 Hz, and 120 Hz. The AD7791BRM provides 24-bit resolution with selectable output update rates of 9.5 Hz, 19 Hz, 38 Hz, 76 Hz, and 120 Hz. These rates are set through the on-chip control register.
How do the power consumption specifications compare?
Both parts are low-power sigma-delta ADCs. The AD7790BRMZ typically consumes about 0.5 mW at 3 V in normal mode, while the AD7791BRM typically consumes about 0.65 mW at 3 V. Both offer power-down modes that reduce supply current to a few microamperes, making them suitable for battery-powered and portable instrumentation.
Do both devices include an on-chip PGA or reference?
Neither the AD7790BRMZ nor the AD7791BRM includes an on-chip programmable gain amplifier or an internal voltage reference. Both require an external reference and provide a single differential input, so system gain and reference must be implemented externally. This differs from higher-integration members of the AD779x family that include a PGA and internal reference.
What interface do the AD7790BRMZ and AD7791BRM use?
Both devices use a 3-wire or 4-wire SPI-compatible serial interface supporting clock frequencies up to 5 MHz. The interface allows read and write access to the on-chip control and data registers, and both parts support daisy-chaining and multiple-device configurations on a shared bus.
Which device should be selected for higher-resolution precision measurement?
The AD7791BRM should be selected when 24-bit resolution is required, such as in precision weigh scales, pressure sensors, and low-frequency instrumentation. The AD7790BRMZ is appropriate when 16-bit resolution is sufficient and a higher maximum output data rate of 120 Hz with lower power is acceptable.
Are the AD7790BRMZ and AD7791BRM specified over the same temperature range?
Yes. Both devices are specified for operation over the industrial temperature range of −40°C to +105°C, and both are available in the same 10-lead MSOP package, allowing them to serve similar industrial and instrumentation environments.