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 AD7788BRMZ and AD7787BRMZ share the same 24-bit sigma-delta architecture, MSOP-10 footprint, and SPI-compatible serial interface, making the AD7787BRMZ a viable functional replacement candidate for the AD7788BRMZ in many low-power precision measurement designs. However, the AD7787BRMZ provides two differential input channels versus the single channel of the AD7788BRMZ, and its output data rate and settling behavior differ, so firmware timing and channel configuration must be validated before substitution.
Package Type
High match
Resolution
High match
Input Channel Count
Validation required
Output Data Rate
Validation required
Parts at a glance
Part B
AD7788BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5028 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 | AD7788BRMZ | AD7787BRMZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution enables finer measurement of small signal changes; a 24-bit ADC provides significantly better precision than a 16-bit device. |
| Number of input channels | 1 (single-ended/pseudo-differential) | 2 (differential) | Channel count determines how many signals can be measured; the AD7787 supports two differential inputs while the AD7788 supports a single channel. |
| Input type | Pseudo-differential | Differential | Differential inputs reject common-mode noise and are preferred for low-level sensor signals, whereas pseudo-differential inputs reference a single ground. |
| Output data rate | 16.7 Hz | 4.17 Hz to 120 Hz (selectable) | Selectable data rates allow trade-offs between noise and speed; the AD7787 offers configurable update rates while the AD7788 has a fixed rate. |
| Interface | SPI (3-wire) | SPI (3-wire) | Both use a similar serial interface, but firmware and register maps differ, so direct code compatibility is not guaranteed. |
| Supply voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means both can operate from the same power rail, simplifying power supply design. |
| Package | 10-lead MSOP | 10-lead MSOP | Same package footprint allows drop-in PCB compatibility, though pin functions may differ. |
| Power consumption | Approx. 1.5 mW (typical) | Approx. 1.5 mW (typical) | Low and comparable power consumption makes both suitable for battery-powered and portable instrumentation. |
| Internal PGA / gain | No (fixed gain) | No (fixed gain) | Neither integrates a programmable gain amplifier, so external signal conditioning may be required for small signals. |
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 | AD7788BRMZ |
|---|---|---|
| Part Status | Active | Active |
| 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 differences between the AD7788BRMZ and AD7787BRMZ?
The AD7788BRMZ is a single-channel, 16-bit sigma-delta ADC, while the AD7787BRMZ is a dual-channel, 24-bit sigma-delta ADC. 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, channel count, and output data rate range.
Are the AD7788BRMZ and AD7787BRMZ pin-compatible?
No. Although both devices are housed in a 10-lead MSOP, the AD7788BRMZ is a single-channel device and the AD7787BRMZ is a dual-channel device with a different pin function assignment. A direct drop-in replacement is not supported; the PCB layout and pin connections must be verified against each respective datasheet.
What is the resolution and channel count of each device?
The AD7788BRMZ provides 16-bit resolution with one differential input channel. The AD7787BRMZ provides 24-bit resolution with two differential input channels, allowing two separate signal sources to be measured by a single converter.
What output data rates are supported by the AD7788BRMZ and AD7787BRMZ?
Both devices support selectable output update rates of 4.17 Hz, 16.7 Hz, 33.3 Hz, and 66.7 Hz, configured through the on-chip control register. The update rate selection is common to both parts and is set via the serial interface.
Do both parts support the same serial interface?
Yes. Both the AD7788BRMZ and AD7787BRMZ use a 3-wire SPI-compatible serial interface for register configuration and data readback, and both include a DOUT/RDY output that indicates when a valid conversion result is available.
What are the supply voltage and current consumption specifications?
Both devices operate from a single supply of 2.7 V to 5.25 V. The AD7788BRMZ typically draws about 250 µA, while the AD7787BRMZ typically draws about 300 µA during normal conversion. Both parts offer a power-down mode to reduce current consumption when not converting.
Can the AD7788BRMZ be used as a replacement for the AD7787BRMZ in an existing design?
Not directly. Because the AD7787BRMZ offers 24-bit resolution and two input channels while the AD7788BRMZ offers 16-bit resolution and one channel, substituting one for the other changes system resolution and channel availability. The firmware, register configuration, and PCB pin assignments must be revalidated against the target device datasheet before any substitution.