Part A
AD7689BCPZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5917 PCS
- Package
- WFQFN-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689BCPZ is a strong functional replacement candidate for the AD7682BCPZRL7, sharing the same 16-bit SAR architecture, 4-channel multiplexed input, and 20-lead LFCSP package. Designers should validate the additional on-chip sequencer and internal reference features of the AD7689BCPZ against their system requirements before finalizing the substitution.
Resolution and Architecture
High match
Channel Count and Input Type
High match
Package and Pin Configuration
High match
On-Chip Reference and Sequencer
Validation required
Parts at a glance
Part B
AD7682BCPZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4566 PCS
- Package
- WFQFN-20
- Series
- Data Acquisition - Analog to Digital Converters (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 | AD7682BCPZRL7 | AD7689BCPZ | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 channels | 8 channels | Channel count determines how many analog signals can be sampled; the AD7689 supports twice as many inputs, so it is not a drop-in replacement where 8 channels are required. |
| Resolution | 16 bits | 16 bits | Both provide 16-bit resolution, so measurement precision and LSB size are equivalent, supporting functional substitutability in precision applications. |
| Sampling Rate (max) | 250 kSPS | 250 kSPS | Identical throughput means timing budgets and anti-aliasing filter design remain unchanged when swapping parts. |
| Input Type | Single-ended / Differential (pseudo-differential) | Single-ended / Differential (pseudo-differential) | Matching input configurations allow the same signal conditioning circuitry to be reused for both parts. |
| Supply Voltage (Analog & Digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Identical supply range means the same power rails and level-shifting can be used, simplifying substitution. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Same serial interface protocol allows reuse of existing firmware and host controller connections. |
| Package | 20-lead LFCSP (4 mm x 4 mm) | 20-lead LFCSP (4 mm x 4 mm) | Identical package and footprint enable direct PCB drop-in replacement without layout changes. |
| Internal Reference | Selectable internal 2.5 V / 4.096 V reference | Selectable internal 2.5 V / 4.096 V reference | Both offer an internal reference, but the AD7689 additionally supports a temperature sensor and sequencer features that may affect system-level configuration. |
| On-chip Sequencer / Temperature Sensor | Not available | Available (sequencer and temperature sensor) | The AD7689 includes a channel sequencer and temperature sensor, adding functionality not present on the AD7682; systems relying on these features cannot substitute the AD7682. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts meet the same environmental requirements for industrial applications. |
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 | AD7689BCPZ | AD7682BCPZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 8 | 4 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Differential, Pseudo-Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.3V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.3V ~ 5.5V |
| Features | Temperature Sensor | Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7682BCPZRL7 and the AD7689BCPZ?
Both are 16-bit, 4-channel/8-channel, 250 kSPS PulSAR analog-to-digital converters in a 20-lead LFCSP package. The AD7682BCPZRL7 is a 4-channel device, while the AD7689BCPZ is an 8-channel device. The AD7689BCPZ also integrates an on-chip temperature sensor and a selectable internal reference buffer, features not present on the AD7682. The AD7682BCPZRL7 is supplied in tape-and-reel packaging (RL7 suffix), whereas the AD7689BCPZ is supplied in standard tray packaging.
Are the AD7682BCPZRL7 and AD7689BCPZ pin-compatible?
Yes. Both devices are offered in the same 20-lead LFCSP (CP-20) package with an identical pinout, allowing the AD7689BCPZ to be used as a drop-in replacement for the AD7682BCPZRL7 on a compatible PCB, provided the additional channel and internal reference features of the AD7689 are accounted for in the design.
Do both parts support the same serial interface and throughput?
Yes. Both the AD7682BCPZRL7 and AD7689BCPZ use a SPI-compatible serial interface and support a maximum throughput of 250 kSPS. Both operate from a single 2.3 V to 5.5 V supply (VDD) with a separate VIO supply for the digital interface, and both support daisy-chain and busy-indicator modes.
What is the resolution and input configuration of these ADCs?
Both devices are 16-bit successive-approximation register (SAR) ADCs. The AD7682BCPZRL7 provides 4 analog input channels, and the AD7689BCPZ provides 8 analog input channels. Both support single-ended, differential, and bipolar input configurations, selectable via the configuration register.
Does the AD7689BCPZ include an internal reference that the AD7682BCPZRL7 lacks?
The AD7689BCPZ includes an internal reference and reference buffer that can be enabled via the configuration register, along with an on-chip temperature sensor. The AD7682BCPZRL7 does not include an internal reference or temperature sensor and requires an external reference. This difference must be considered when substituting one part for the other.
Can the AD7682BCPZRL7 and AD7689BCPZ operate from the same supply voltages?
Yes. Both devices operate from an analog supply (VDD) of 2.3 V to 5.5 V and a digital I/O supply (VIO) of 1.8 V to VDD. Both also support a separate reference input range compatible with the external reference applied, and both are specified over the −40 °C to +85 °C industrial temperature range.
What packaging difference exists between the AD7682BCPZRL7 and AD7689BCPZ?
Both parts use the 20-lead LFCSP (CP-20) package. The AD7682BCPZRL7 suffix indicates tape-and-reel packaging intended for automated assembly, while the AD7689BCPZ is supplied in standard tray packaging. The package footprint and pinout are identical, so the packaging difference does not affect PCB layout.