Part A
AD7718BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5458 個数
- Package
- TSSOP-28
- 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 AD7718BRZ and AD7718BRUZ are functionally equivalent signal conditioning ADCs sharing identical core specifications, differing only in package and temperature grade. The AD7718BRUZ is a viable functional replacement candidate for the AD7718BRZ, provided the TSSOP-28 footprint and extended temperature range are acceptable for the target design.
Resolution and Architecture
High match
Input Channel Configuration
High match
Package Type
Validation required
Operating Temperature Range
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 | AD7718BRZ | AD7718BRUZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both parts provide 24-bit resolution, so measurement precision is identical and no firmware scaling changes are needed. |
| Number of ADC channels | 8 (single-ended) / 4 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many sensor inputs can be multiplexed; identical counts mean the same signal routing works for both. |
| Interface type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Matching serial interfaces ensure the same host microcontroller and driver code can communicate with either part. |
| Supply voltage (analog/digital) | 2.7 V to 3.6 V / 2.7 V to 5.25 V | 2.7 V to 3.6 V / 2.7 V to 5.25 V | Identical supply ranges allow the same power rail design and level shifting to be reused without modification. |
| Package / mounting type | 28-lead SOIC (surface mount) | 28-lead TSSOP (surface mount) | Different package footprints require different PCB land patterns, so a board redesign or adapter is needed when substituting one for the other. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range means both parts suit the same environmental conditions and reliability requirements. |
| PGA gain range | 1 to 128 | 1 to 128 | Identical programmable gain ranges allow the same low-level sensor signals to be amplified without changing configuration. |
| Internal oscillator | Yes (on-chip) | Yes (on-chip) | Both include an internal oscillator, so no external clock source is required for either variant. |
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 | AD7718BRUZ | AD7718BRZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 1.37k | 1.37k |
| Number of Inputs | 4/5, 8/10 | 4/5, 8/10 |
| Input Type | Differential, Pseudo-Differential | Differential, Pseudo-Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the primary difference between the AD7718BRZ and AD7718BRUZ?
The AD7718BRZ is supplied in a 28-lead SOIC package, while the AD7718BRUZ is supplied in a 28-lead TSSOP package. Both are the same AD7718 signal conditioning ADC die in the same temperature grade and performance bin, differing only in package type and corresponding board footprint.
Are the AD7718BRZ and AD7718BRUZ electrically and functionally identical?
Yes. Both parts share the same AD7718 core: a 24-bit sigma-delta ADC with on-chip PGA, eight/six input channels, and the same register map and serial interface. The only specified difference is the package outline and its thermal/board-level characteristics.
Can the AD7718BRZ and AD7718BRUZ be used interchangeably on the same PCB?
No, not without a layout change. The SOIC (BRZ) and TSSOP (BRUZ) packages have different body widths, lead pitches, and land patterns, so they are not drop-in replacements for each other even though the silicon is equivalent.
Do both parts share the same operating temperature range and supply requirements?
Yes. Both the AD7718BRZ and AD7718BRUZ are specified over the industrial temperature range of -40°C to +85°C and operate from a single 2.7 V to 5.25 V supply (with a separate 1.8 V to 3.6 V digital supply option), consistent with the AD7718 datasheet.
Which package should be selected for a new design, SOIC or TSSOP?
Selection depends on board space and assembly constraints. The TSSOP (AD7718BRUZ) offers a smaller footprint for space-constrained designs, while the SOIC (AD7718BRZ) provides wider lead spacing that may be preferred for ease of inspection, probing, or existing SOIC-compatible layouts.
Are the AD7718BRZ and AD7718BRUZ both RoHS compliant?
Yes. The "Z" suffix in both part numbers denotes RoHS-compliant, lead-free (Pb-free) packaging per Analog Devices' standard nomenclature, so both variants meet RoHS requirements.
Do both variants support the same serial interface and resolution?
Yes. Both the AD7718BRZ and AD7718BRUZ provide a 24-bit sigma-delta conversion with the same SPI/QSPI/MICROWIRE-compatible serial interface and identical programmable gain and channel configuration, since these are die-level features independent of package.