Part A
AD7689ACPZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2964 ПКС
- Package
- WFQFN-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7689BCPZRL7 and AD7689ACPZ are functionally equivalent 16-bit, 8-channel SAR ADCs sharing the same core architecture, resolution, channel count, and LFCSP package, making them viable substitutes in most designs. The primary distinction lies in the grade and temperature rating, so the AD7689ACPZ should be validated against the target application's thermal and accuracy requirements before substitution.
Resolution and Channel Count
High match
Package Type
High match
Operating Temperature Range
Validation required
Accuracy Grade
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 | AD7689ACPZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide the same 16-bit resolution, so measurement precision is equivalent. |
| Number of Channels | 8 (single-ended) / 4 (differential) | 8 (single-ended) / 4 (differential) | Identical channel count and configuration options allow the same sensor/multiplexer architecture. |
| Sampling Rate | 250 kSPS | 250 kSPS | Same maximum throughput supports the same signal bandwidth and timing budget. |
| Input Type | Pseudo-differential / differential (multiplexed) | Pseudo-differential / differential (multiplexed) | Matching input topology ensures the same analog front-end design can be reused. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Same serial interface allows drop-in compatibility with the host controller firmware. |
| Supply Voltage (Analog & Digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Identical supply range permits the same power rail design and level shifting. |
| Package / Mounting | 20-Lead LFCSP, surface mount | 20-Lead LFCSP, surface mount | Same package and footprint enable direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings mean the same environmental conditions can be supported. |
| Internal Reference | Yes (selectable internal reference) | Yes (selectable internal reference) | Both offer an on-chip reference, simplifying the reference circuit and reducing external components. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7689ACPZ | AD7689BCPZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 8 | 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 AD7689ACPZ?
Both parts are 16-bit, 8-channel, 250 kSPS PulSAR analog-to-digital converters from Analog Devices in a 20-lead LFCSP package. The primary difference is the ordering format: AD7689BCPZRL7 is supplied in tape-and-reel packaging (7-inch reel, 1,500 units per reel) for automated assembly, while AD7689ACPZ is supplied in tray packaging. The "B" and "A" in the part numbers denote the same silicon die; the suffix differences reflect packaging and shipment format rather than electrical specification changes.
Are the AD7689BCPZRL7 and AD7689ACPZ electrically and functionally identical?
Yes. Both devices share the same datasheet specifications: 16-bit resolution, 8-channel multiplexer, 250 kSPS throughput, SPI-compatible serial interface, internal 4.096 V reference, and selectable input ranges (0 V to VREF, 0 V to 2×VREF, or ±VREF). The AD7689BCPZRL7 and AD7689ACPZ differ only in packaging format (tape-and-reel vs. tray), so their electrical, timing, and functional characteristics are the same.
Can the AD7689BCPZRL7 be used as a drop-in replacement for the AD7689ACPZ?
Yes, from a footprint and electrical standpoint. Both are the same 20-lead LFCSP (CP-20) package with identical pinout and land pattern, and both meet the same datasheet specifications. The only practical consideration is the supply format: the AD7689BCPZRL7 is tape-and-reel, which suits automated pick-and-place lines, while the AD7689ACPZ is tray-packed. Design validation against the AD7689 datasheet is recommended before substitution.
What is the package and pin count for both the AD7689BCPZRL7 and AD7689ACPZ?
Both devices are offered in a 20-lead LFCSP (lead frame chip scale package), designated CP-20 in Analog Devices documentation. The package measures 4 mm × 4 mm with a 0.5 mm pitch. Pin functions, including the analog inputs, reference, SPI interface, and power pins, are identical between the two orderable part numbers.
What are the resolution and sampling rate of the AD7689BCPZRL7 and AD7689ACPZ?
Both parts provide 16-bit resolution with no missing codes and a maximum throughput of 250 kSPS. They feature an 8-channel multiplexer with selectable single-ended or differential input configurations, making them suitable for multichannel data acquisition systems.
Do the AD7689BCPZRL7 and AD7689ACPZ include an internal voltage reference?
Yes. Both devices integrate an internal 4.096 V reference with selectable temperature coefficient options, and they also support the use of an external reference. The internal reference can be configured for the full-scale input range, and the devices offer selectable input spans of 0 V to VREF, 0 V to 2×VREF, or ±VREF.
What interface do the AD7689BCPZRL7 and AD7689ACPZ use for communication?
Both devices use an SPI-compatible serial interface supporting clock rates up to 50 MHz, with a separate digital supply (VIO) that allows operation from 1.8 V to 5 V logic levels. The interface supports daisy-chain and busy-indicator modes, enabling multiple devices to share a single host controller.
What are the operating temperature ranges for the AD7689BCPZRL7 and AD7689ACPZ?
Both orderable part numbers are specified over the industrial temperature range of −40 °C to +85 °C, consistent with the AD7689 datasheet. The "B" and "A" designators in the part numbers do not indicate different temperature grades; both are industrial-grade devices.