Part A
AD7789BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4316 個数
- Package
- TFSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7788BRM is a functionally compatible replacement candidate for the AD7789BRMZ, sharing the same 16-bit sigma-delta architecture, pinout, and package family, though the AD7789BRMZ offers higher resolution and a wider feature set that may require validation for resolution-critical designs.
Resolution
High match
Package Type
High match
Interface Type
Validation required
Supply Voltage
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7789BRMZ | AD7788BRM | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit device offers far finer measurement granularity than a 16-bit device. |
| Number of Input Channels | 1 (single differential) | 1 (single differential) | Both are single-channel differential devices, so channel count is not a differentiator for substitutability. |
| Interface Type | SPI / 3-wire serial | SPI / 3-wire serial | A matching serial interface allows the parts to drop into the same digital bus without firmware or layout changes. |
| Package | 10-lead MSOP | 10-lead MSOP | Identical package and pinout enable direct board-level substitution without PCB redesign. |
| Supply Voltage (VDD) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges mean the same power rail can drive either device. |
| Output Data Rate | 4.17 Hz to 120 Hz | 4.17 Hz to 120 Hz | Equivalent update rates support the same measurement bandwidth and settling behavior in the application. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Identical temperature ratings ensure both parts meet the same environmental requirements. |
| Power Consumption | Approx. 400 µA typical | Approx. 400 µA typical | Similar current draw keeps overall system power budgets unchanged when swapping parts. |
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 | AD7789BRMZ | AD7788BRM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 16 |
| Sampling Rate(Per Second) | 16.6 | 16.6 |
| 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 ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7789BRMZ and the AD7788BRM?
The AD7789BRMZ is a 24-bit sigma-delta ADC, while the AD7788BRM is a 16-bit sigma-delta ADC. Both are single-channel, low-power devices in 10-lead MSOP packages, but they differ in resolution, output data rate, and RMS noise performance. The AD7789 offers higher resolution and lower noise, while the AD7788 provides 16-bit performance at a lower cost point.
Are the AD7789BRMZ and AD7788BRM pin-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package and share the same pinout, including the serial interface, reference inputs, and analog input pins. This allows a common PCB footprint, though firmware and configuration settings must account for the resolution and timing differences.
What is the resolution and output data rate of each device?
The AD7789BRMZ provides 24-bit resolution with output data rates of 16.7 Hz and 9.4 Hz (via the filter selection). The AD7788BRM provides 16-bit resolution with output data rates of 16.7 Hz and 9.4 Hz. Both use a sigma-delta architecture with on-chip digital filtering.
Do both parts support the same serial interface?
Yes. Both the AD7789BRMZ and AD7788BRM use a 3-wire SPI-compatible serial interface for communication with a microcontroller or DSP. The interface supports read and write operations for configuration and data retrieval, and both devices can be daisy-chained or operated with a single chip select.
What are the power supply and current consumption specifications?
Both devices operate from a single 2.7 V to 5.25 V supply. The AD7789BRMZ typically consumes 225 µA in normal mode, while the AD7788BRM typically consumes 225 µA as well. Both offer a power-down mode that reduces current to approximately 1 µA, making them suitable for low-power, battery-operated applications.
Can the AD7788BRM be used as a drop-in replacement for the AD7789BRMZ?
Hardware-wise, the AD7788BRM is pin-compatible and can be placed on the same PCB footprint. However, it is not a direct functional drop-in replacement because the resolution is reduced from 24 bits to 16 bits. System firmware and calibration routines must be validated to ensure the lower resolution meets the application's accuracy requirements.
What are the typical applications for these ADCs?
Both the AD7789BRMZ and AD7788BRM are suited for low-power, high-precision measurement applications such as portable instrumentation, temperature and pressure sensors, weigh scales, and industrial process control. The AD7789 is preferred where higher resolution and lower noise are required, while the AD7788 is used where 16-bit performance is sufficient.