Part A
AD7689BCPZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1710 PCS
- Package
- WFQFN-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689BCPZRL7 is a functional upgrade candidate for the AD7682BCPZRL7, sharing the same LFCSP-20 footprint, 16-bit SAR architecture, and SPI interface, while adding two extra input channels and an internal reference buffer. Designers should validate channel-count requirements and reference configuration before substituting in existing AD7682 sockets.
Package and Pinout
High match
Resolution and Architecture
High match
Input Channel Count
Validation required
Internal Reference
Validation required
Parts at a glance
Part B
AD7682BCPZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4566 PCS
- Package
- WFQFN-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7689BCPZRL7 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 4 single-ended / 2 differential | 8 single-ended / 4 differential | Channel count determines how many analog signals can be multiplexed into the ADC, directly affecting system architecture and whether the parts are interchangeable in multi-channel designs. |
| Resolution | 16 bits | 16 bits | Resolution defines the smallest measurable signal change; identical 16-bit resolution means both parts offer the same nominal precision. |
| Sampling Rate | 250 kSPS | 250 kSPS | Maximum throughput must meet the application's signal bandwidth; matching rates means timing performance is equivalent. |
| Supply Voltage (Analog & Digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Operating supply range determines compatibility with the system power rails; identical ranges allow drop-in substitution from a power standpoint. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility ensures the same host controller and firmware can drive either device without redesign. |
| Package | 20-lead LFCSP (4 mm x 4 mm) | 20-lead LFCSP (4 mm x 4 mm) | Package and footprint must match for board-level interchangeability; identical LFCSP packages allow the same PCB land pattern. |
| Internal Reference | Yes (selectable, with temperature sensor) | Yes (selectable, with temperature sensor) | An on-chip reference reduces external component count and board space; both offering it means similar BOM simplification. |
| Input Multiplexer Configuration | 4-channel MUX (single-ended or differential pairs) | 8-channel MUX (single-ended or differential pairs) | The MUX configuration dictates how many sensors or signals can be connected; the differing channel count is the primary functional distinction between these parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment; matching industrial ranges confirm equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7689BCPZRL7 | 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 AD7689BCPZRL7?
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 AD7689BCPZRL7 is an 8-channel device. Both share the same core architecture, SPI interface, and internal reference, but differ in channel count and input multiplexer configuration.
Are the AD7682BCPZRL7 and AD7689BCPZRL7 pin-compatible?
No. Although both are offered in a 20-lead LFCSP package, the AD7682BCPZRL7 provides 4 analog input channels and the AD7689BCPZRL7 provides 8 analog input channels, so the input pin assignments and multiplexer configuration differ. They are not direct drop-in replacements for each other.
Do both parts support the same SPI serial interface?
Yes. Both the AD7682BCPZRL7 and AD7689BCPZRL7 use a SPI-compatible serial interface supporting daisy-chain and busy indicator modes, with throughput up to 250 kSPS. The digital timing and interface protocol are consistent across both devices.
What is the resolution and throughput of these ADCs?
Both the AD7682BCPZRL7 and AD7689BCPZRL7 are 16-bit successive-approximation register (SAR) ADCs with a maximum throughput of 250 kSPS. They provide no missing codes at 16 bits and support both single-ended and differential input configurations.
Do both devices include an internal voltage reference?
Yes. Both the AD7682BCPZRL7 and AD7689BCPZRL7 integrate an internal 4.096 V reference with selectable reference output and temperature sensor, and they also support external reference operation. The reference architecture is common to both parts.
What is the operating supply voltage and power consumption?
Both devices operate from a single 2.3 V to 5.5 V analog supply (VDD) and a 1.8 V to 5.5 V digital supply (VIO). Power consumption scales with throughput; at 250 kSPS the typical power is approximately 4 mW, and both parts support power-down modes for lower consumption at reduced sample rates.
Can the AD7682BCPZRL7 be used as a substitute for the AD7689BCPZRL7 in an existing design?
Only if the design uses four or fewer analog input channels and the PCB layout and firmware are validated against the AD7682BCPZRL7 pinout and multiplexer configuration. Because the channel count and input pin assignments differ, substitution requires schematic, layout, and software verification against the respective datasheets.
What package and temperature range do these parts support?
Both the AD7682BCPZRL7 and AD7689BCPZRL7 are supplied in a 20-lead LFCSP (CP-20) package and are specified over the industrial temperature range of −40°C to +85°C. The "RL7" suffix indicates tape-and-reel packaging.