Texas Instruments ADS4126IRGZR

Overview

ADS4126IRGZR from Texas Instruments is a 12-bit, 160MSPS ultralow-power analog-to-digital converter (ADC) optimized for wideband communications systems. It delivers 70.6dBFS SNR at 170MHz input, consumes only 201mW at 160MSPS on a single 1.8V supply, and features DDR LVDS output with programmable swing (200mV/350mV) - enabling high-fidelity digitization in multi-carrier baseband receivers.

For engineers reviewing the ADS4126IRGZR datasheet, ADS4126IRGZR pinout, ADS4126IRGZR application, or ADS4126IRGZR equivalent, key selection criteria include its 160MSPS sampling rate, QFN-48 package thermal performance (θ_JA = 29°C/W), LVDS/CMOS interface flexibility, fine gain up to 6dB for SFDR optimization, and dc offset correction loop for precision signal chain alignment.

Technical Context

The ADS4126IRGZR employs a pipeline ADC architecture with integrated analog input buffers and a digital dc offset correction loop. Its dynamic power scaling automatically reduces consumption at lower sampling rates without degrading SNR or SFDR, and it supports low-clock-amplitude operation down to 200mV_PP differential.

It operates in two configurable output modes: DDR LVDS (with programmable 100Ω or 50Ω termination strength and 200mV/350mV swing) or 1.8V parallel CMOS. The MODE register (03h/4Ah) enables high-performance tuning for specific clock/input frequency combinations.

Key Specifications

Pinout & Package

ADS4126IRGZR is housed in a 7mm × 7mm QFN-48 package (RGZ) with exposed thermal pad connected to DRGND. Pinout supports both LVDS and CMOS output modes via DFS pin configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with ADS4129IRGZR and ADS4146IRGZR, the ADS4126IRGZR offers optimal balance of 12-bit fidelity, 160MSPS throughput, and ultralow 201mW power - making it the most thermally efficient choice for cost-sensitive, space-constrained wideband communications receivers.

Availability

ADS4126IRGZR is available at Aetrix Electronics and suitable for direct-conversion receivers, multi-carrier base stations, and software-defined radio systems requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and RoHS-compliant green packaging.

Supply support for ADS4126IRGZR 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, automotive, and communications markets.

The ADS4126IRGZR belongs to TI's ADS41xx family of ultralow-power, high-speed ADCs designed specifically for wideband wireless infrastructure and test equipment where thermal density and dynamic performance are critical.

FAQ

What is the maximum analog input frequency supported by the ADS4126IRGZR?

The ADS4126IRGZR supports analog input frequencies up to 400MHz with a 2V_PP input amplitude and up to 800MHz with a 1V_PP amplitude, as specified in the Recommended Operating Conditions table. Its 550MHz analog input bandwidth ensures minimal roll-off and phase distortion within this range, making it suitable for undersampling applications in IF digitization.

Does the ADS4126IRGZR support both LVDS and CMOS output interfaces?

Yes, the ADS4126IRGZR supports both DDR LVDS and 1.8V parallel CMOS output interfaces. Interface selection is controlled by the DFS pin: logic high configures LVDS mode (with D0_D1_P/M through D12_D13_P/M outputs), while logic low selects CMOS mode (D0–D13 single-ended outputs). Both modes share identical timing and register configuration.

What is the purpose of the VCM pin on the ADS4126IRGZR?

The VCM pin on the ADS4126IRGZR outputs a precise 0.95V common-mode voltage used to bias the differential analog inputs (INP/INM). This internally generated reference eliminates the need for an external bias network and ensures optimal linearity and SNR. It must be decoupled to AGND with a 10nF capacitor per the layout guidelines in the datasheet.

How does dynamic power scaling work in the ADS4126IRGZR?

Dynamic power scaling in the ADS4126IRGZR automatically reduces analog and digital supply currents when the sampling rate is lowered below 160MSPS, without sacrificing SNR, SFDR, or other AC performance metrics. This occurs transparently via internal clock-gating and bias adjustment - no register writes or external control signals are required.

Is the ADS4126IRGZR pin-compatible with earlier TI ADC families?

Yes, the ADS4126IRGZR is pin-compatible with the ADS6149 family, enabling straightforward migration. However, key differences exist: AVDD is reduced from 3.3V to 1.8V, input common-mode voltage changes from 1.5V to 0.95V, and Pin 23 is reserved (not MODE) - requiring schematic and layout review before drop-in replacement.