Part A
AD7705BR
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6867 個数
- Package
- SOIC-16
- 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 AD7705BRZ-REEL7 and AD7705BR are functionally equivalent 16-bit sigma-delta ADCs sharing the same core architecture, package, and pinout, making the REEL7 variant a viable drop-in replacement for the tube-packaged part in most designs. The only meaningful distinction is the packaging and delivery format, which affects inventory handling rather than electrical performance.
Resolution and Architecture
High match
Package Type
High match
Pin Configuration
High match
Packaging and Delivery Format
Validation required
Parts at a glance
Part B
AD7705BRZ-REEL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1361 個数
- Package
- SOIC-16
- 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 | AD7705BRZ-REEL7 | AD7705BR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both provide the same ADC resolution, so measurement precision is equivalent. |
| Number of Channels | 2 (differential) | 2 (differential) | Identical channel count and configuration allow the same sensor interface design. |
| Interface Type | SPI / 3-wire serial | SPI / 3-wire serial | Same serial interface means the host microcontroller firmware and wiring remain compatible. |
| Supply Voltage Range | 2.7 V to 3.3 V (VDD) | 2.7 V to 3.3 V (VDD) | Matching supply requirements allow the same power rail design to be reused. |
| Package / Mounting | 16-lead SOIC (surface mount) | 16-lead SOIC (surface mount) | Same package and footprint enable drop-in board replacement without layout changes. |
| Packaging / Ordering Format | Tape and reel (REEL7) | Tube / bulk | Different packaging affects assembly line handling and inventory format, though the die is functionally the same. |
| Lead-Free / RoHS Status | RoHS compliant, lead-free (Z suffix) | Non-RoHS, contains lead | RoHS compliance affects regulatory conformity and solder process selection for the assembly. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness in the application. |
| Input Type | Sigma-delta, differential | Sigma-delta, differential | Same conversion architecture and input topology preserve signal-chain behavior and filter design. |
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 | AD7705BR | AD7705BRZ-REEL7 |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 500 | 500 |
| Number of Inputs | 2 | 2 |
| Input Type | Differential | 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 ~ 3.3V, 5V | 2.7V ~ 3.3V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.3V, 5V | 2.7V ~ 3.3V, 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between AD7705BRZ-REEL7 and AD7705BR?
Both are the same AD7705 16-bit sigma-delta ADC from Analog Devices in a 16-lead SOIC package. The AD7705BRZ-REEL7 is the RoHS-compliant (Z grade) version supplied on a 7-inch tape-and-reel for automated assembly, while AD7705BR is the non-RoHS tube-packaged version. The silicon die and electrical specifications are identical.
Are AD7705BRZ-REEL7 and AD7705BR electrically interchangeable?
Yes. Both parts share the same 16-bit sigma-delta ADC core, two differential input channels with programmable gain, SPI-compatible serial interface, and 16-lead SOIC footprint. The only differences are RoHS compliance (Z suffix) and packaging format (tape-and-reel vs tube), so they are electrically and functionally interchangeable in the same PCB design.
What is the resolution and architecture of the AD7705?
The AD7705 is a 16-bit sigma-delta (ΔΣ) analog-to-digital converter with two fully differential input channels and an on-chip programmable gain amplifier (PGA) offering gains from 1 to 128. It is designed for low-frequency, high-resolution measurement applications such as industrial process control and weigh scales.
What supply voltage and interface does the AD7705 support?
The AD7705 operates from a 2.7 V to 3.3 V or 4.75 V to 5.25 V supply (VDD) with a separate VDD of 2.7 V to 5.25 V for the digital interface, and communicates via a 3-wire SPI-compatible serial interface. It also provides a programmable output update rate and a buffered reference input.
Does the Z suffix on AD7705BRZ-REEL7 indicate RoHS compliance?
Yes. In Analog Devices nomenclature, the "Z" suffix denotes a RoHS-compliant, lead-free package. AD7705BRZ-REEL7 is therefore RoHS-compliant, whereas AD7705BR (without the Z) is the non-RoHS leaded version. Designers with RoHS-restricted assemblies should select the Z-grade part.
Can AD7705BR be used as a drop-in replacement for AD7705BRZ-REEL7?
Functionally yes, since both share the same die, pinout, and 16-lead SOIC package. However, AD7705BR is not RoHS-compliant and is supplied in tubes rather than tape-and-reel, so it may not satisfy RoHS-restricted production requirements or automated pick-and-place assembly. Verify compliance and packaging needs before substituting.
What packaging format does AD7705BRZ-REEL7 use?
AD7705BRZ-REEL7 is supplied on a 7-inch tape-and-reel (REEL7 suffix) in a 16-lead SOIC package, suitable for automated surface-mount assembly. AD7705BR is supplied in tubes. Both use the identical 16-lead SOIC body and pinout.