Texas Instruments ADS6222IRGZT

Overview

ADS6222IRGZT from Texas Instruments is a dual-channel, 12-bit, 65 MSPS analog-to-digital converter with serial LVDS interface, simultaneous sample-and-hold architecture, internal reference, and 3.3-V analog/digital supply. It delivers 71.3 dBFS SINAD at 10 MHz input (0 dB gain), 83 dBc SFDR at 170 MHz (3.5 dB gain), and 315 mW total power per channel - optimized for IF sampling in base-station receivers and medical imaging front-ends.

For engineers reviewing the ADS6222IRGZT datasheet, ADS6222IRGZT pinout, ADS6222IRGZT application, or ADS6222IRGZT equivalent, this page provides verified technical context, package mapping to QFN-48 (7 mm × 7 mm), confirmed LVDS 2-wire/DDR interface timing, industrial temperature range (–40°C to 85°C), and validated alternative options for dual-channel 12-bit ADC migration paths.

Technical Context

The ADS6222IRGZT implements a dual 12-bit pipeline ADC core with simultaneous sampling on two independent channels, each featuring programmable 3.5 dB coarse gain and up to 6 dB fine gain (1 dB steps) to optimize SFDR/SNR trade-offs. Its internal PLL multiplies the input clock to generate bit and frame clocks for serialization.

Output data is serialized over two LVDS pairs per channel (2-wire DDR mode), limiting bit rate to <1 Gbps at 65 MSPS; it also supports legacy 1-wire mode. LVDS buffers include programmable current, current doubling, and internal termination - all configurable via parallel pins (CFG1–CFG4) or serial register interface.

Key Specifications

Pinout & Package

ADS6222IRGZT is housed in a thermally enhanced 48-pin QFN package (7 mm × 7 mm, RGZ designation) with exposed thermal pad. Pin functions are defined per TI SLAS543B Rev. January 2014, Figure 1 and Table 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS6222IRGZT, ADS6223IRGZT offers 23% higher sample rate at +11% power, while ADS6224IRGZT adds 62% speed at +29% power - both retain identical QFN-48 packaging, LVDS serialization, and parallel/serial configuration compatibility for seamless upgrade paths.

Availability

ADS6222IRGZT is available at Aetrix Electronics and suitable for base-station IF receivers, medical ultrasound imaging systems, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS6222IRGZT 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, embedded processing, and high-performance data converters for industrial, communications, and medical applications.

The ADS622X family was designed specifically for high-density, low-jitter dual-channel IF digitization - targeting wireless infrastructure, medical imaging, and instrumentation where simultaneous sampling, LVDS interface, and flexible gain control are critical.

FAQ

What is the maximum sampling frequency supported by ADS6222IRGZT?

The ADS6222IRGZT supports a maximum sampling frequency of 65 MSPS, as specified in TI's SLAS543B datasheet. This rating applies across the full industrial temperature range (–40°C to 85°C) with AVDD = LVDD = 3.3 V and proper clock conditioning. At this rate, the device maintains guaranteed 12-bit no-missing-codes performance, 71.3 dBFS SINAD, and 83 dBc SFDR at 170 MHz input with 3.5 dB coarse gain. The ADS6222IRGZT is the lowest-speed variant in the ADS622X family, enabling lower power consumption and relaxed clock jitter requirements compared to ADS6223IRGZT (80 MSPS) and ADS6224IRGZT (105 MSPS).

Does ADS6222IRGZT require external decoupling capacitors for its internal reference?

No, the ADS6222IRGZT does not require external decoupling capacitors for its internal reference - this is explicitly stated in the datasheet's FEATURES section. The device integrates a stable internal reference (VREFT = 2.0 V, VREFB = 1.0 V) with ±2 mV typical error and supports external reference mode via the VCM pin. When using the internal reference, all necessary filtering and regulation are implemented on-die, eliminating the need for external bypass capacitors typically required with discrete reference ICs. This reduces board space and simplifies layout, especially in compact RF modules where the ADS6222IRGZT is commonly deployed.

What LVDS interface modes does ADS6222IRGZT support?

The ADS6222IRGZT supports two LVDS interface configurations: 2-wire DDR (default) and 1-wire SDR. In 2-wire DDR mode, each channel's data is serialized across two differential pairs (e.g., DA0/DA1 for Channel A), halving the bit rate to <1 Gbps at 65 MSPS - easing FPGA receiver design. The 1-wire SDR mode uses a single LVDS pair per channel but requires higher bit rates. Interface selection is controlled by CFG1 pin voltage (0 V = DDR + 1-wire; LVDD – 200 mV = DDR + 2-wire). Both modes transmit LVDS frame and bit clocks, and all LVDS outputs support programmable current, current doubling, and internal 100-Ω termination.

Can ADS6222IRGZT operate with an external reference, and what is the required VCM voltage?

Yes, the ADS6222IRGZT supports external reference operation. When configured for external reference mode (via SEN pin at 0 V or (3/8)LVDD), the VCM pin must be driven to a precise 1.50 V ±50 mV (i.e., 1.45 V to 1.55 V) to establish the analog input common-mode level. This voltage sets the midpoint of the 2 Vpp differential input range, resulting in a full-scale swing of ±1 Vpp. External reference mode is commonly used when system-level calibration or custom gain staging requires tighter control over reference accuracy than the internal ±2 mV tolerance allows - and the ADS6222IRGZT maintains full 12-bit performance under these conditions.

What is the channel-to-channel aperture delay variation for ADS6222IRGZT?

The ADS6222IRGZT specifies a channel-to-channel aperture delay variation of ±80 ps maximum across the industrial temperature range (–40°C to 85°C), as documented in the TIMING SPECIFICATIONS table of SLAS543B. This tight matching ensures phase coherence between Channel A and Channel B sampling instants - critical for I/Q demodulation, beamforming, and time-difference-of-arrival measurements. The variation is measured as the difference in aperture delay (tA) between the two channels, and the ±80 ps bound holds at all supported sampling frequencies from 5 MSPS to 65 MSPS. This parameter is guaranteed by design and characterization, not production-tested.