Part A
AD7682BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4059 Stückzahl
- Package
- WFQFN-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689ACPZ is a strong functional replacement candidate for the AD7682BCPZ, sharing the same 16-bit SAR architecture, 4-channel/8-channel multiplexed input configuration, LFCSP package footprint, and wide supply range. Designers should validate the additional channel count and interface configuration settings before finalizing the substitution in production.
Resolution and Architecture
High match
Package and Footprint
High match
Channel Count
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD7689ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2964 Stückzahl
- Package
- WFQFN-20
- Series
- Datenerfassung mit 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 | AD7682BCPZ | AD7689ACPZ | Why it matters |
|---|---|---|---|
| Number of Input Channels | 4 channels | 8 channels | Channel count determines how many analog signals can be multiplexed into a single ADC, directly affecting system architecture and board space. |
| Resolution | 16 bits | 16 bits | Resolution sets the smallest detectable signal change; identical 16-bit resolution means comparable measurement precision. |
| Sampling Rate | 250 kSPS | 250 kSPS | Throughput determines the maximum signal bandwidth the ADC can digitize; matching rates allow similar dynamic performance. |
| Supply Voltage (Analog & Digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Supply range affects compatibility with system rails and logic levels; identical ranges simplify power design and level shifting. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility determines whether the part can drop into an existing digital host without firmware or hardware changes. |
| Input Type | Single-ended / Differential (multiplexed) | Single-ended / Differential (multiplexed) | Input configuration flexibility affects sensor interfacing options and whether the same front-end can serve both single-ended and differential sources. |
| Package | 20-lead LFCSP (4 mm x 4 mm) | 20-lead LFCSP (4 mm x 4 mm) | Package footprint and pinout determine PCB layout compatibility and whether a direct board drop-in replacement is possible. |
| Internal Reference | Selectable internal reference (2.5 V / 4.096 V) with buffer | Selectable internal reference (2.5 V / 4.096 V) with buffer | An internal reference reduces external component count; both parts offer the same reference options, so reference design is interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet specifications; matching ranges allow use in the same applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7682BCPZ | AD7689ACPZ |
|---|---|---|
| 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 AD7689ACPZ?
The AD7682BCPZ is a 16-bit, 4-channel, 250 kSPS PulSAR ADC, while the AD7689ACPZ is a 16-bit, 8-channel, 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 (8 versus 4) and includes an on-chip sequencer for multi-channel scanning. The AD7682 is intended for lower channel-count applications, whereas the AD7689 suits systems requiring more analog inputs.
Are the AD7682BCPZ and AD7689ACPZ pin-compatible?
Yes. Both devices are offered in the same 20-lead LFCSP (CP-20-6) package with an identical pinout, allowing the AD7689ACPZ to be used as a drop-in replacement for the AD7682BCPZ on an existing PCB layout when additional channels are needed, provided the firmware accounts for the extra channel addresses and sequencer behavior.
Do both ADCs support the same serial interface and throughput?
Yes. Both the AD7682BCPZ and AD7689ACPZ use a SPI-compatible serial interface (with separate SDI, SDO, SCK, and CNV inputs) and both offer a maximum throughput of 250 kSPS at 16-bit resolution. The digital timing and interface protocol are the same across the two parts.
What is the difference in analog input channel count and configuration?
The AD7682BCPZ provides 4 analog input channels, configurable as 4 single-ended inputs, 2 differential pairs, or combinations thereof. The AD7689ACPZ provides 8 analog input channels with the same configurability (8 single-ended, 4 differential pairs, or mixed). The AD7689 also includes an on-chip channel sequencer that allows automatic scanning of multiple channels without reconfiguring the input multiplexer for each conversion.
Are the reference and supply requirements the same for both parts?
Yes. Both devices 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 an external reference (REF) as well as an internal reference option. The reference input range and the internal reference voltage are identical between the AD7682BCPZ and AD7689ACPZ.
Can the AD7682BCPZ and AD7689ACPZ be used interchangeably in an existing design?
They are hardware-interchangeable due to identical package and pinout, but firmware must be reviewed. The AD7689ACPZ exposes additional channel addresses and sequencer registers that the AD7682BCPZ does not implement. A design written for the AD7682 will generally run on the AD7689 if only the first four channels are used, but code written for the AD7689 sequencer will not function on the AD7682.
Do both parts share the same operating temperature range and package?
Yes. Both the AD7682BCPZ and AD7689ACPZ are specified over the industrial temperature range of −40 °C to +85 °C and are supplied in the 20-lead LFCSP (CP-20-6) package. The "BCPZ" and "ACPZ" suffixes denote the same package and temperature grade, differing only in the channel-count variant.