AD7622BCPZRL Equivalent & Substitute Parts

Part Overview

The AD7622BCPZRL is a 16-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., part of the PulSAR® series. This single-input SAR (Successive Approximation Register) ADC features differential input configuration and operates at 2 MHz sampling rate with external or internal reference capability. The device is packaged in a 48-LFCSP-VQ (7x7) surface mount package.

The AD7622BCPZRL is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

AD7622BCPZRL

Analog Devices Inc.In Stock: 796AD7622BCPZRL Datasheet

Current PartRFQ

AD7985BCPZ

Analog Devices Inc.In Stock: 2450AD7985BCPZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AD7622BCPZRL are identified based on the following core electrical and mechanical parameters:

• 16-bit resolution (maintains signal fidelity and precision)
• SAR architecture (ensures functional equivalence in conversion methodology)
• Single input channel (matches application requirements)
• External and internal reference capability (preserves design flexibility)
• SPI and DSP data interface support (ensures protocol compatibility)
• Operating temperature range of -40°C to +85°C (maintains thermal specifications)
• Surface mount packaging (supports PCB integration requirements)
• Moisture Sensitivity Level MSL 3 (ensures handling and storage compatibility)

The AD7985BCPZ qualifies as a substitute based on these parameters. While differences exist in input type (pseudo-differential vs. differential), sampling rate (2.5 MHz vs. 2 MHz), package footprint (20-LFCSP vs. 48-LFCSP), and supply voltage tolerance, these variations remain within acceptable substitution criteria for applications where the functional core specifications align.

Parameter Comparison

Engineering Selection Recommendations

The AD7985BCPZ is an active product with current manufacturing support and ROHS3 compliance certification, providing supply chain continuity for the obsolete AD7622BCPZRL. Both devices share identical 16-bit resolution, SAR architecture, single-input configuration, and operating temperature specifications.

Selection of the AD7985BCPZ requires evaluation of the following design considerations:

• Input configuration change from differential to pseudo-differential affects signal conditioning requirements
• Sampling rate increase from 2 MHz to 2.5 MHz may require firmware or timing adjustments
• Package footprint reduction from 48-LFCSP (7x7) to 20-LFCSP (4x4) necessitates PCB layout redesign
• Removal of parallel interface option (SPI and DSP only) requires verification of existing communication protocol implementation
• Supply voltage tolerance adjustment (2.375V – 2.625V vs. 2.37V – 2.63V) requires power supply specification review

The AD7985BCPZ is suitable for new designs and production transitions where these parameter differences align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can the AD7985BCPZ directly replace the AD7622BCPZRL without design modifications?

A: Direct pin-for-pin replacement is not possible due to package footprint differences (48-LFCSP vs. 20-LFCSP). PCB layout redesign is required. Additionally, the removal of the parallel interface option and change in input type require firmware and signal conditioning verification.

Q: What is the impact of the input type change from differential to pseudo-differential?

A: Differential inputs provide true differential signal measurement with independent positive and negative inputs. Pseudo-differential inputs reference one input to ground. This affects signal conditioning circuit design and common-mode rejection characteristics. Application-specific evaluation is required.

Q: Does the higher sampling rate of the AD7985BCPZ (2.5 MHz vs. 2 MHz) create compatibility issues?

A: The higher sampling rate is a performance enhancement and does not create backward compatibility issues. However, timing-critical applications must verify that firmware and signal processing algorithms accommodate the increased data rate.

Q: Is the AD7985BCPZ suitable for applications requiring parallel interface communication?

A: No. The AD7985BCPZ supports only SPI and DSP interfaces. Applications dependent on parallel interface communication require alternative component selection or interface conversion circuitry.

Q: What are the moisture handling requirements for both devices?

A: Both the AD7622BCPZRL and AD7985BCPZ are classified as MSL 3, requiring storage at ≤30°C and ≤60% relative humidity, with a floor life of 168 hours after moisture exposure. Standard moisture barrier packaging and handling procedures apply.

Q: Are there supply voltage compatibility concerns between the two devices?

A: Supply voltage ranges are nearly identical (2.37V – 2.63V vs. 2.375V – 2.625V). Existing power supply designs require minimal adjustment. Verify that power supply regulation meets the tighter tolerance of the AD7985BCPZ if applicable.