Part A
AD7682BCPZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4059 ПКС
- Package
- WFQFN-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689BCPZRL7 and AD7682BCPZ are functionally compatible candidates for substitution in many designs, sharing the same 16-bit SAR ADC architecture, 8-channel multiplexer, and LFCSP package footprint. However, the AD7689BCPZRL7 offers a higher throughput rate of 250 kSPS versus 200 kSPS for the AD7682BCPZ, and the two devices differ in their analog input configuration and internal reference behavior. Designers should validate timing margins, reference configuration, and input range requirements before finalizing a replacement.
Throughput Rate
Validation required
Resolution and Architecture
High match
Package and Pinout
High match
Analog Input Configuration
Validation required
Parts at a glance
Part B
AD7689BCPZRL7
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1710 ПКС
- Package
- WFQFN-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | AD7689BCPZRL7 | AD7682BCPZ | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 4 | Channel count determines how many analog inputs can be sampled; an 8-channel part can replace a 4-channel part only if the extra channels are unused or the board is redesigned. |
| Resolution | 16 bits | 16 bits | Resolution sets the smallest detectable signal change; identical 16-bit resolution means both provide the same nominal measurement precision. |
| Sampling Rate (max) | 250 kSPS | 250 kSPS | Maximum throughput must meet the system's sampling requirement; matching rates mean neither part limits acquisition speed relative to the other. |
| Supply Voltage (analog & digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Operating voltage range must match the system rails; identical ranges allow either part to work in the same power domain. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Digital interface compatibility determines whether the part can drop into an existing host connection without firmware or wiring changes. |
| Input Type | Single-ended (configurable) | Single-ended (configurable) | Input configuration must match the sensor topology; identical single-ended configurability supports the same signal conditioning front end. |
| Package | 20-lead LFCSP (4 mm x 4 mm) | 20-lead LFCSP (4 mm x 4 mm) | Package footprint and pinout must match for board-level interchangeability; identical LFCSP packages allow the same PCB land pattern. |
| Internal Reference | Yes (selectable internal reference) | Yes (selectable internal reference) | An internal reference simplifies the design by removing an external reference; both offering it means reference architecture is interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment; matching industrial ranges mean equivalent environmental qualification. |
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 | AD7682BCPZ | AD7689BCPZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 4 | 8 |
| 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 AD7689BCPZRL7 and the AD7682BCPZ?
The AD7689BCPZRL7 is a 16-bit, 8-channel, 250 kSPS PulSAR ADC, while the AD7682BCPZ is a 16-bit, 4-channel, 250 kSPS PulSAR ADC. Both share the same 20-lead LFCSP package and similar architecture, but the AD7689 provides eight input channels versus four on the AD7682. The AD7689BCPZRL7 is supplied in tape-and-reel packaging, whereas the AD7682BCPZ is supplied in tray packaging.
Are the AD7689BCPZRL7 and AD7682BCPZ pin-compatible?
Yes. Both devices are offered in the same 20-lead LFCSP (CP-20) package with the same pinout, allowing the AD7682BCPZ to be used on a board designed for the AD7689BCPZRL7 where fewer input channels are required, provided the channel-count difference is acceptable in the application.
Do the AD7689BCPZRL7 and AD7682BCPZ have the same resolution and throughput?
Yes. Both are 16-bit successive-approximation register (SAR) ADCs with a maximum throughput of 250 kSPS, and both support the same serial interface and internal reference options per the Analog Devices datasheets.
Can the AD7682BCPZ directly replace the AD7689BCPZRL7 in an existing design?
Pin compatibility and shared resolution/throughput allow a direct footprint replacement, but the AD7682 provides only four input channels versus eight on the AD7689. The replacement is valid only if the application does not require the additional channels of the AD7689BCPZRL7 and all configuration settings are verified against the AD7682 datasheet.
What input channel configuration does each device support?
The AD7689BCPZRL7 provides eight analog input channels configurable as single-ended, differential, or bipolar inputs. The AD7682BCPZ provides four analog input channels with the same configuration options. Both use the same internal multiplexer and sequencer architecture per Analog Devices documentation.
Do both parts support the same supply voltage and reference options?
Yes. Both the AD7689BCPZRL7 and AD7682BCPZ operate from a single 2.3 V to 5.5 V supply (with a separate VIO of 1.8 V to 5.5 V) and support an internal 4.096 V reference, an external reference, or a supply-referenced configuration, as specified in the respective Analog Devices datasheets.
What are the packaging differences between the AD7689BCPZRL7 and AD7682BCPZ?
Both devices use the 20-lead LFCSP package. The AD7689BCPZRL7 suffix "RL7" indicates tape-and-reel packaging in 7-inch reels, suitable for automated assembly. The AD7682BCPZ is supplied in standard tray packaging. The package body and pinout are identical.