AD7622BSTZRL Equivalent & Substitute Parts

Part Overview

The AD7622BSTZRL is a 16-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., part of the PulSAR® series. This SAR (Successive Approximation Register) architecture device features a single differential input with 2M samples per second sampling rate, housed in a 48-LQFP (7x7) surface mount package. The device is currently in active production status with 870 units available in new original inventory. Finding equivalent or substitute parts may be necessary due to packaging constraints, supply availability, or specific application requirements for alternative form factors or performance characteristics.

Substiute Parts

AD7622BSTZRL

Analog Devices Inc.In Stock: 949AD7622BSTZRL Datasheet

Current PartRFQ

AD7985BCPZ

Analog Devices Inc.In Stock: 2450AD7985BCPZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD7622BSTZRL with the AD7985BCPZ is permissible based on the following core electrical and mechanical parameters:

Matching Parameters:

• Resolution: Both devices are 16-bit ADCs
• Architecture: Both utilize SAR (Successive Approximation Register) architecture
• Number of Inputs: Both feature single input configuration
• Reference Type: Both support external and internal reference options
• Supply Voltage Compatibility: Both operate within overlapping voltage ranges (2.37V ~ 2.63V for AD7622BSTZRL; 2.375V ~ 2.625V for AD7985BCPZ)
• Operating Temperature: Both rated for -40°C ~ 85°C
• Compliance: Both are ROHS3 compliant with identical MSL ratings
• Manufacturer: Both manufactured by Analog Devices Inc., PulSAR® series

Differing Parameters:

• Sampling Rate: AD7622BSTZRL operates at 2M samples/second; AD7985BCPZ operates at 2.5M samples/second
• Input Type: AD7622BSTZRL features differential input; AD7985BCPZ features pseudo-differential input
• Data Interface: AD7622BSTZRL supports SPI, Parallel, and DSP; AD7985BCPZ supports SPI and DSP only
• Package: AD7622BSTZRL uses 48-LQFP (7x7); AD7985BCPZ uses 20-LFCSP (4x4)
• Packaging Format: AD7622BSTZRL supplied in Tape & Reel; AD7985BCPZ supplied in Tray

Parameter Comparison

Engineering Selection Recommendations

Both the AD7622BSTZRL and AD7985BCPZ are active production devices from Analog Devices Inc. with identical compliance certifications (ROHS3, REACH Unaffected, EAR99 classification). Selection between these parts should be based on specific application requirements:

The AD7622BSTZRL is suitable for applications requiring true differential input signal processing, parallel data interface capability, and the larger 48-LQFP package footprint. The AD7985BCPZ is suitable for applications where a smaller form factor (20-LFCSP) is advantageous, higher sampling rate (2.5M vs 2M samples/second) is beneficial, and pseudo-differential input processing is acceptable. Both devices maintain identical operating temperature ranges and supply voltage compatibility within their specified tolerances.

Frequently Asked Questions (FAQ)

Q: Can AD7985BCPZ directly replace AD7622BSTZRL in existing designs?

A: Direct replacement requires design review. While both are 16-bit SAR ADCs with compatible supply voltages and operating temperatures, the AD7985BCPZ has a smaller package (20-LFCSP vs 48-LQFP), different input type (pseudo-differential vs differential), and lacks parallel interface support. PCB layout modifications and firmware adjustments may be necessary.

Q: What is the key difference in input configuration between these parts?

A: The AD7622BSTZRL features a true differential input, allowing independent positive and negative signal paths. The AD7985BCPZ features pseudo-differential input, where the negative input is internally biased. This affects signal conditioning requirements and input impedance characteristics.

Q: Does the higher sampling rate of AD7985BCPZ (2.5M vs 2M) affect compatibility?

A: The higher sampling rate of the AD7985BCPZ is a performance enhancement and does not prevent substitution. However, applications designed for 2M samples/second operation should verify that the higher rate does not introduce timing conflicts or require firmware modifications.

Q: Are there data interface compatibility concerns?

A: The AD7622BSTZRL supports SPI, Parallel, and DSP interfaces, while the AD7985BCPZ supports only SPI and DSP. If the application requires parallel interface operation, the AD7985BCPZ cannot be used as a substitute.

Q: What packaging considerations apply to these parts?

A: The AD7622BSTZRL is supplied in Tape & Reel format in a 48-LQFP (7x7) package. The AD7985BCPZ is supplied in Tray format in a 20-LFCSP (4x4) package. The significantly smaller footprint of the AD7985BCPZ may require PCB redesign, while the different packaging format affects handling and assembly processes.