Part A
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)
Replacement verdict
Compatible functional replacement candidate
The AD7788ARM is a functional replacement candidate for the AD7787BRMZ only in applications that do not require the second differential input channel or the integrated reference buffer, since both devices share the same 24-bit sigma-delta architecture, SPI interface, and MSOP-10 footprint. Designers must validate the loss of the second channel and the absence of the on-chip reference buffer against their specific signal-chain requirements before substituting.
Input Channel Count
Validation required
Resolution and ADC Architecture
High match
Package Type
High match
Reference Buffer
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 | AD7787BRMZ | AD7788ARM | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Higher resolution enables finer measurement of small signal changes; a 24-bit ADC resolves much smaller LSBs than a 16-bit ADC, directly affecting precision. |
| 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 timing details may differ; confirming interface compatibility is essential for drop-in substitution. |
| Package | 10-lead MSOP | 10-lead MSOP | Package footprint and pinout must match for board-level interchangeability; both are 10-lead MSOP but pin assignments should be verified. |
| Supply voltage range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range affects compatibility with the system power rail; identical ranges simplify substitution. |
| Output data rate | 4.17 Hz to 120 Hz | 4.17 Hz to 120 Hz | Data rate determines measurement update speed and noise trade-off; matching rates support similar system timing behavior. |
| Internal PGA / gain | Yes (gain 1 to 128) | Yes (gain 1 to 128) | Programmable gain allows amplification of small sensor signals; matching gain ranges preserves signal conditioning flexibility. |
| Power consumption | Approx. 1 mW (typical) | Approx. 1 mW (typical) | Low power is critical for portable and battery-powered designs; similar consumption supports comparable thermal and battery life performance. |
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 | AD7787BRMZ | AD7788ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 16 |
| Sampling Rate(Per Second) | 120 | 16.6 |
| Number of Inputs | 2 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-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 ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD7787BRMZ and the AD7788ARM?
The AD7787BRMZ is a 24-bit, dual-channel, low-power sigma-delta ADC with a differential input and an on-chip PGA, housed in a 10-lead MSOP. The AD7788ARM is a 16-bit, single-channel, low-power sigma-delta ADC in an 8-lead MSOP. The AD7787 offers higher resolution and two input channels, while the AD7788 provides a simpler single-channel signal chain.
Do the AD7787BRMZ and AD7788ARM have the same package and pinout?
No. The AD7787BRMZ is supplied in a 10-lead MSOP (RM suffix), whereas the AD7788ARM is supplied in an 8-lead MSOP (RM suffix). The different lead counts mean the packages are not pin-for-pin compatible, and PCB land patterns must be designed accordingly.
Can the AD7787BRMZ and AD7788ARM be used interchangeably in an existing design?
No, they are not drop-in replacements. They differ in resolution (24-bit vs 16-bit), channel count (dual vs single), package size (10-lead vs 8-lead MSOP), and register map. Any substitution requires a full review of the digital interface, PCB footprint, and system accuracy requirements against the respective datasheets.
How do the power consumption specifications compare between the two devices?
Both parts are specified as low-power sigma-delta ADCs, but the exact supply current and power figures differ and must be taken from the respective manufacturer datasheets. The AD7787BRMZ and AD7788ARM each support low-power operating modes, and the appropriate mode should be selected based on the update rate and resolution required by the application.
What digital interface do the AD7787BRMZ and AD7788ARM provide?
Both devices provide a serial interface for communication with a host microcontroller or DSP. The exact interface protocol, register set, and timing characteristics are defined in each product's datasheet and are not identical between the two parts, so firmware must be written specifically for the selected device.
Which device is better suited for high-resolution, multi-channel measurement?
The AD7787BRMZ is the more appropriate choice for high-resolution, multi-channel measurement because it provides 24-bit resolution and two input channels. The AD7788ARM, with 16-bit resolution and a single channel, is better suited to simpler, lower-channel-count applications where 16-bit precision is sufficient.
Are the AD7787BRMZ and AD7788ARM specified over the same temperature range?
The operating temperature range for each device is stated in its respective datasheet. Designers should confirm the specified temperature grade of the exact orderable part number, since the AD7787BRMZ and AD7788ARM are separate products and their temperature specifications should be verified individually rather than assumed to be identical.