Part A
AD7788ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3173 個数
- Package
- MSOP-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 AD7788ARMZ is a functionally compatible replacement candidate for the AD7787BRMZ, sharing the same 24-bit sigma-delta architecture, 2.7 V to 5.25 V supply range, and MSOP-10 footprint, though the AD7787BRMZ offers a dual-channel input and higher output data rate that the AD7788ARMZ does not match. Designers should validate channel count and update rate requirements before substituting.
Input Channel Count
Validation required
Resolution
High match
Package Type
High match
Output Data Rate
Validation required
Parts at a glance
Part B
AD7787BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6351 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7787BRMZ | AD7788ARMZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Higher resolution provides finer measurement granularity; a 24-bit ADC resolves much smaller signal changes than a 16-bit ADC, affecting precision-critical applications. |
| Number of input channels | 2 (differential) | 1 (differential) | Channel count determines how many independent signals can be measured; the AD7787 supports two differential inputs while the AD7788 supports only one. |
| Interface type | SPI / 3-wire serial | SPI / 3-wire serial | Both use a similar serial interface, but firmware and register maps differ, so drop-in code compatibility is not guaranteed despite the same bus type. |
| Package | 10-lead MSOP | 10-lead MSOP | Identical package and pin count allow the same PCB footprint, but pin functions must be verified before substitution. |
| Supply voltage range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges mean both can operate from the same power rail, simplifying power supply design during substitution. |
| Output data rate | 4.17 Hz to 120 Hz (programmable) | 4.17 Hz to 120 Hz (programmable) | Similar programmable update rates suit low-frequency precision measurement, but throughput and settling behavior should be confirmed for the target application. |
| Internal PGA / gain | Yes (gain 1 to 128) | Yes (gain 1 to 128) | On-chip programmable gain allows direct connection of small-amplitude sensors without external amplification, affecting front-end design complexity. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +105 °C | Identical temperature ratings ensure both parts meet the same environmental requirements for industrial and instrumentation use. |
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 | AD7788ARMZ | AD7787BRMZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 24 |
| Sampling Rate(Per Second) | 16.6 | 120 |
| Number of Inputs | 1 | 2 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | ADC | MUX-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 ~ 105°C |
Frequently asked questions
What are the key differences between the AD7787BRMZ and AD7788ARMZ?
The AD7787BRMZ is a 24-bit, 2-channel (differential) sigma-delta ADC with a programmable gain amplifier (PGA) and an SPI-compatible serial interface, housed in a 10-lead MSOP. The AD7788ARMZ is a 16-bit, single-channel (differential) sigma-delta ADC without a PGA, housed in a 10-lead MSOP. The AD7787 offers higher resolution and two input channels, while the AD7788 provides 16-bit resolution in a single-channel configuration.
Are the AD7787BRMZ and AD7788ARMZ pin-compatible?
No. Although both devices are offered in a 10-lead MSOP package, their pin functions differ. The AD7787 includes PGA-related and additional channel connections, while the AD7788 has a different pin assignment for its single-channel architecture. A direct drop-in replacement is not possible without verifying pin functions against the respective datasheets.
What is the resolution and channel count of each device?
The AD7787BRMZ provides 24-bit resolution with two differential input channels. The AD7788ARMZ provides 16-bit resolution with one differential input channel. Designs requiring higher precision or multiple channels should select the AD7787, while the AD7788 suits lower-resolution single-channel applications.
Do both devices include a programmable gain amplifier (PGA)?
No. The AD7787BRMZ integrates a programmable gain amplifier, allowing gain settings for low-level signal conditioning. The AD7788ARMZ does not include a PGA. This difference affects the minimum resolvable input signal and the external signal conditioning required in a design.
What serial interface do these ADCs use?
Both the AD7787BRMZ and AD7788ARMZ use an SPI-compatible serial interface for communication with a host microcontroller or DSP. The interface supports read/write access to configuration and data registers, enabling flexible system integration.
Can the AD7788ARMZ be used as a replacement for the AD7787BRMZ in an existing design?
Not directly. The AD7788ARMZ has lower resolution (16-bit vs 24-bit), lacks a PGA, and has a different pin assignment. Replacing the AD7787BRMZ with the AD7788ARMZ would require redesign of the signal chain, PCB layout, and firmware to accommodate these differences, and should only be done after validation against both datasheets.
What package type do the AD7787BRMZ and AD7788ARMZ use?
Both devices are supplied in a 10-lead MSOP (Mini Small Outline Package). The package type is the same, but pin functions and internal architecture differ, so package compatibility alone does not guarantee interchangeability.