Texas Instruments ADC3422IRTQR

Overview

ADC3422IRTQR from Texas Instruments is a quad-channel, 12-bit, 50-MSPS analog-to-digital converter with serial LVDS interface, 70.2 dBFS SNR at 70 MHz input, 87 dBc SFDR, and ultra-low power consumption of 98 mW per channel. It serves as a high-linearity digitizer for wideband RF receivers in multi-carrier base stations and radar systems.

For engineers reviewing the ADC3422IRTQR datasheet, ADC3422IRTQR pinout, ADC3422IRTQR application, or ADC3422IRTQR equivalent, this page delivers verified specifications, VQFN-56 package mapping, channel-isolation–driven design guidance, and real-world synchronization use cases for time-critical SDR and smart antenna array implementations.

Technical Context

The ADC3422IRTQR integrates four independent 12-bit ADC cores sharing a common 1.8-V analog (AVDD) and digital (DVDD) supply, each with differential analog inputs (INAP/INAM through INDP/INDM), internal phase-locked loop (PLL) for bit clock generation, and SYSREF support for multi-chip synchronization. Its serial LVDS interface uses two-wire serialization per channel (DA0P/DA0M through DD1P/DD1M), plus dedicated DCLKP/DCLKM and FCLKP/FCLKM outputs.

It features flexible clocking via an on-chip input clock buffer supporting divide-by-1, -2, or -4, enabling system-level clock tree simplification. Internal dither and chopper circuitry improve AC performance stability across temperature and process variation without external calibration.

Key Specifications

Pinout & Package

VQFN-56 (8 mm × 8 mm) package with exposed thermal pad (PowerPAD™) on underside for enhanced heat dissipation in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel, 12-bit ADC applications.

Compared with ADC3421IRTQ, ADC3422IRTQR delivers +12 dB SFDR headroom at 70 MHz and supports twice the Nyquist bandwidth; versus ADC34J22IRTCR, it avoids JESD204B PHY complexity and reduces per-channel power by 22%, favoring cost-sensitive, thermally constrained SDR designs.

Availability

ADC3422IRTQR is available at Aetrix Electronics and suitable for multi-carrier base stations, radar signal processors, and communications test equipment requiring stable component supply, long-term obsolescence management, and traceable TI-sourced inventory.

Supply support for ADC3422IRTQR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-performance data converters and signal chain solutions.

The ADC342x family was designed specifically for demanding, high-input-frequency applications requiring large dynamic range-targeting wireless infrastructure, defense radar, and precision test instrumentation markets.

FAQ

What is the maximum sampling rate supported by the ADC3422IRTQR?

The ADC3422IRTQR supports a maximum sampling rate of 50 MSPS, as confirmed in Section 7.6 of the SBAS673A datasheet. This rate is fixed for the ADC3422 variant and cannot be extended beyond 50 MSPS-even with clock divider configurations-because the internal pipeline architecture is optimized for this speed grade. At 50 MSPS, the ADC3422IRTQR achieves 70.2 dBFS SNR and 87 dBc SFDR at 70 MHz input frequency, making it ideal for mid-band IF sampling applications.

Does the ADC3422IRTQR support JESD204B interface?

No, the ADC3422IRTQR does not support JESD204B. It implements a proprietary serial LVDS interface with two differential pairs per channel (e.g., DA0P/DA0M for Channel A wire-0), plus separate DCLKP/DCLKM and FCLKP/FCLKM outputs. JESD204B capability is reserved for the ADC34Jxx series (e.g., ADC34J22IRTCR). Using ADC3422IRTQR requires FPGA LVDS input banks configured for source-synchronous DDR capture, not JESD204B link layer logic.

How is multi-device synchronization achieved with the ADC3422IRTQR?

The ADC3422IRTQR supports deterministic multi-chip synchronization via its differential SYSREFP/SYSREFM inputs, which align internal sampling phases across multiple devices. When driven synchronously with a common SYSREF signal (e.g., from a clock generator like LMK04832), all ADC3422IRTQR units achieve sub-cycle timing alignment-critical for beamforming in smart antenna arrays. This capability is explicitly documented in Section 9.4 ("Device Functional Modes") and Figure 42 of the SBAS673A datasheet.

What is the role of the VCM pin on the ADC3422IRTQR?

The VCM pin on the ADC3422IRTQR outputs a buffered 0.95-V common-mode voltage used to bias all eight differential analog inputs (INAP/INAM through INDP/INDM). It sources up to 10 mA and must be decoupled with a 1-µF capacitor to GND. This internal reference eliminates the need for external common-mode generation circuitry, simplifying layout and improving matching across channels-directly contributing to the specified 105-dB channel isolation performance.

Can the ADC3422IRTQR operate with a single 1.8-V supply?

Yes, the ADC3422IRTQR operates from dual 1.8-V supplies: AVDD (analog) and DVDD (digital), both rated 1.7 V to 1.9 V per Section 7.3 of the datasheet. While both rails are nominally 1.8 V, they must be independently decoupled-AVDD requires low-noise analog filtering, and DVDD needs fast transient response for LVDS output switching. Sharing a single regulator without proper splitting and filtering degrades SNR by up to 3 dB due to digital noise coupling into analog sections.