ADC34J22IRGZ25

Analog To Digital Converters (ADC) Overview

The ADC34J22IRGZ25 is a quad-channel, 12-bit analog-to-digital converter (ADC) from Texas Instruments. It operates at a maximum sampling rate of 50 MSPS and utilizes a single 1.8-V supply. The device features an internal phase-locked loop (PLL) that multiplies the incoming sampling clock by 20 to derive the bit clock for serializing data over a JESD204B interface. Key electrical characteristics include a typical signal-to-noise ratio (SNR) of 70.2 dBFS and a spurious-free dynamic range (SFDR) of 95 dBc at fIN = 10 MHz. Total power dissipation is typically 491 mW at maximum sampling rates.

Analog To Digital Converters (ADC) Feature Summary

• Quad-channel architecture with 12-bit resolution and 50 MSPS maximum sampling rate
• JESD204B serial interface supporting Subclass 0, 1, and 2 compliance up to 3.2 Gbps
• Internal dither mechanism to improve SFDR and clean noise floor
• Flexible input clock buffer with divide-by-1, -2, or -4 options

Analog To Digital Converters (ADC) Applications

• Multi-carrier, multi-mode cellular base stations
• Radar and smart antenna arrays
• Software defined radios (SDRs)
• Communications test equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the suffix 'RGZ25' corresponds to the specific tape-and-reel packaging configuration required for automated assembly. Confirm that the component meets RoHS3 standards and check the moisture sensitivity level (MSL 3) requirements for storage and reflow soldering profiles prior to procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a 50 MSPS sampling rate is sufficient for the application bandwidth. Ensure the system design accommodates the 1.8-V analog and digital supply voltages. Verify that the host processor supports the JESD204B protocol for lane serialization and that the PCB layout guidelines for the VQFN-48 package are strictly followed to maintain signal integrity.

Analog To Digital Converters (ADC) Part Context

This component belongs to the ADC34J2x family, which includes variants with higher sampling rates such as the ADC34J23 (80 MSPS), ADC34J24 (125 MSPS), and ADC34J25 (160 MSPS). All members of this family share pin-to-pin compatibility and similar architectural features, allowing for design flexibility across different speed requirements within the same product line.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same family include the ADC34J23IRGZ25, ADC34J24IRGZ25, and ADC34J25IRGZ25. These alternatives offer higher sampling speeds but require verification of power consumption and thermal management capabilities in the existing design.

Analog To Digital Converters (ADC) FAQ

What is the function of the internal PLL in the ADC34J22?

The internal phase-locked loop (PLL) multiplies the incoming ADC sampling clock by 20. This derived bit clock is used to serialize the 12-bit data from each channel for output over the JESD204B interface.

How does the internal dither feature affect performance?

Enabling the internal dither creates a cleaner noise floor and improves the Spurious-Free Dynamic Range (SFDR). For example, at fIN = 10 MHz, enabling dither increases the typical SFDR from 91 dBc to 95 dBc.

What are the supported JESD204B subclasses?

The ADC34J22 supports JESD204B Subclass 0, 1, and 2. Subclass 1 support enables complete system synchronization via the SYSREF input.