Texas Instruments ADS4222IRGCT

Overview

ADS4222IRGCT from Texas Instruments is a dual-channel, 12-bit, 65 MSPS analog-to-digital converter (ADC) optimized for ultralow-power operation on a single 1.8-V supply. It delivers 71.4-dBFS SNR and 88-dBc SFDR at 170 MHz input frequency, with >90 dB crosstalk at 185 MHz, and supports both DDR LVDS and parallel CMOS output interfaces in a VQFN-64 package. It is used in wireless infrastructure baseband receivers requiring high dynamic range and low power.

For engineers reviewing the ADS4222IRGCT datasheet, ADS4222IRGCT pinout, ADS4222IRGCT application, or ADS4222IRGCT equivalent, key selection considerations include its 65 MSPS sampling rate, 12-bit resolution, LVDS/CMOS interface flexibility, programmable gain up to 6 dB, and DC offset correction - all critical for multi-carrier SDR and PA linearization designs.

Technical Context

The ADS4222IRGCT implements a dual-sampling architecture with independent analog front-ends per channel, each featuring differential inputs (INP_A/INM_A, INP_B/INM_B) and internal reference generation eliminating external reference pins. Its digital backend includes a DDR LVDS serializer with programmable swing (200 mV or 350 mV) and a parallel CMOS mode supporting 12-bit data width per channel.

It operates with a 1.8-V AVDD analog supply and separate 1.8-V DRVDD for output buffers, enabling rail-to-rail compatibility with FPGA or ASIC receivers. The device integrates a DC offset correction loop and supports gain programming to trade SNR for SFDR - a feature confirmed for ADS4222 across all operating modes per Section 7.6 of SBAS533E.

Key Specifications

Pinout & Package

Package: VQFN-64 (9.00 mm × 9.00 mm) with exposed thermal pad connected to DRGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS4225IRGCT and ADS4226IRGCT, the ADS4222IRGCT offers optimal power efficiency for 30–40 MHz bandwidth applications, trading maximum sample rate for lower thermal density and simplified clock distribution - making it ideal for thermally constrained wireless cards where 65 MSPS suffices.

Availability

ADS4222IRGCT is available at Aetrix Electronics and suitable for wireless communications infrastructure, software-defined radio development, and power amplifier linearization requiring stable component supply across production lifecycles.

Supply support for ADS4222IRGCT 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 ADS42xx family - including ADS4222IRGCT - was designed specifically for low-power, high-dynamic-range digitization in wireless infrastructure and instrumentation, emphasizing thermal efficiency, interface flexibility, and integration of reference and offset correction functions.

FAQ

What is the maximum sampling rate supported by the ADS4222IRGCT?

The ADS4222IRGCT supports a maximum sampling rate of 65 MSPS. This is explicitly specified in the device family documentation (SBAS533E, Table 5-1) and confirmed in Section 7.6 Electrical Characteristics for ADS4222. At this rate, the device consumes 183 mW total power and maintains 71.4-dBFS SNR and 88-dBc SFDR at 170 MHz input frequency - performance validated across the industrial temperature range.

Does the ADS4222IRGCT require an external voltage reference?

No, the ADS4222IRGCT does not require an external voltage reference. As stated in Section 5 Description and Figure 8-1, it features integrated reference generation, eliminating traditional REFIO/REFLO pins and associated decoupling capacitors. The VCM pin outputs a stable 0.95-V common-mode voltage usable for external input biasing, further reducing system component count and layout complexity.

What output interface options does the ADS4222IRGCT support?

The ADS4222IRGCT supports two configurable output interfaces: DDR LVDS and parallel CMOS. In LVDS mode, it delivers multiplexed 12-bit data with programmable swing (200 mV or 350 mV). In CMOS mode, it outputs 12-bit parallel data at 1.8-V logic levels. Mode selection is controlled via the serial interface (CTRL1–CTRL3 pins) and is detailed in Sections 6.1 and 6.2 of SBAS533E.

How is DC offset corrected in the ADS4222IRGCT?

The ADS4222IRGCT includes a dedicated DC offset correction loop that automatically measures and cancels channel-specific analog input offsets. This function is enabled by default and can be configured or disabled via register settings (Register Address 01h, bit DCOFF_EN). As described in Section 8.3.3, it improves image rejection in zero-IF receivers and enhances dynamic range consistency between channels - a verified feature for ADS4222 across all operating conditions.

What is the package type and thermal pad connection for the ADS4222IRGCT?

The ADS4222IRGCT uses a VQFN-64 package (9.00 mm × 9.00 mm) with an exposed thermal pad. Per Section 6 Pin Configuration and Functions, the thermal pad is electrically connected to DRGND (pin 49 and PAD), and must be soldered to a PCB thermal plane tied to the digital output ground to ensure proper heat dissipation and signal integrity - a requirement confirmed in the Thermal Information table (Section 7.4) of SBAS533E.