Part A
AD7682BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4059 PCS
- Package
- WFQFN-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689BCPZ is a functional upgrade candidate for the AD7682BCPZ, sharing the same 20-lead LFCSP footprint, 16-bit SAR architecture, and SPI interface, while offering an extended input multiplexer configuration. Designers should validate channel configuration and input range settings against the target application before substitution.
Package and Pinout
High match
Resolution and Architecture
High match
Input Multiplexer Configuration
Validation required
Digital Interface
High match
Parts at a glance
Part B
AD7689BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5917 PCS
- Package
- WFQFN-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7682BCPZ | AD7689BCPZ | Why it matters |
|---|---|---|---|
| Number of ADC Input Channels | 4 channels | 8 channels | Determines how many analog signals can be multiplexed into the ADC; an 8-channel part can replace a 4-channel part only if the extra channels are unused, but not vice versa. |
| Resolution | 16 bits | 16 bits | Both provide the same 16-bit conversion resolution, so measurement precision and LSB size are equivalent. |
| Sampling Rate (max) | 250 kSPS | 250 kSPS | Identical throughput means timing budgets and anti-aliasing filter design remain unchanged when substituting. |
| Supply Voltage (VDD) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Same supply range allows the parts to operate from the same rail without regulator changes. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface ensures the same host controller firmware and pin connections can be reused. |
| Package | 20-lead LFCSP (4 mm x 4 mm) | 20-lead LFCSP (4 mm x 4 mm) | Same footprint and package allow drop-in PCB replacement without layout changes. |
| Input Type | Pseudo-differential / single-ended | Pseudo-differential / single-ended | Matching input configurations mean the same signal conditioning circuitry can be used for both parts. |
| Internal Reference | Yes (selectable, with buffer) | Yes (selectable, with buffer) | Both integrate a reference, so no external reference is required and reference-related design is interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range ensures both parts meet the same environmental requirements. |
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 | AD7689BCPZ |
|---|---|---|
| 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 AD7682BCPZ and AD7689BCPZ?
The AD7682BCPZ is a 4-channel, 16-bit, 250 kSPS PulSAR ADC, while the AD7689BCPZ is an 8-channel, 16-bit, 250 kSPS PulSAR ADC. Both share the same 20-lead LFCSP package and serial interface, but the AD7689 provides twice the number of input channels.
Are the AD7682BCPZ and AD7689BCPZ pin-compatible?
Yes. Both devices are offered in the same 20-lead LFCSP (CP-20-6) package with identical pin functions, allowing the AD7689BCPZ to be used in place of the AD7682BCPZ when additional input channels are required, provided the configuration is updated accordingly.
Do both ADCs support the same input configurations?
Both devices support single-ended, differential, and bipolar input configurations. The AD7682BCPZ provides 4 input channels, while the AD7689BCPZ provides 8 input channels, selectable via the configuration register over the SPI interface.
What is the maximum throughput of the AD7682BCPZ and AD7689BCPZ?
Both devices offer a maximum throughput of 250 kSPS at 16-bit resolution, with no missing codes, using an external reference or the internal reference option.
Do these ADCs include an internal reference?
Yes. Both the AD7682BCPZ and AD7689BCPZ include an on-chip internal reference with a typical value of 4.096 V, and they also support the use of an external reference for improved accuracy or different input ranges.
What digital interface do the AD7682BCPZ and AD7689BCPZ use?
Both devices use a SPI-compatible serial interface supporting QSPI, MICROWIRE, and DSP interface standards, with a separate VIO supply pin for digital interface voltage compatibility.
What are the supply voltage requirements for these ADCs?
Both devices operate from a single analog supply (AVDD) of 2.3 V to 5.5 V and a digital interface supply (VIO) of 1.8 V to 5.5 V, with a separate VDD supply for the internal reference and analog front end.
Can the AD7682BCPZ be replaced by the AD7689BCPZ in an existing design?
Because both parts share the same package, pinout, and core specifications, the AD7689BCPZ can generally replace the AD7682BCPZ. However, the configuration register settings and channel selection logic must be reviewed, since the AD7689 provides 8 channels versus 4 on the AD7682.