Texas Instruments ADS41B49IRGZT

Overview

ADS41B49IRGZT from Texas Instruments is a 14-bit, 250-MSPS analog-to-digital converter with integrated high-impedance analog input buffers, DDR LVDS output interface, and programmable gain/offset correction. It delivers 69 dBFS SNR at 170 MHz input and operates on 1.8-V analog and digital supplies with ultralow total power of 411 mW. It targets wideband communications infrastructure requiring stable sampling performance across multi-carrier RF bands.

For engineers reviewing the ADS41B49IRGZT datasheet, ADS41B49IRGZT pinout, ADS41B49IRGZT application, or ADS41B49IRGZT equivalent, key selection considerations include its 14-bit resolution at 250 MSPS, integrated 3-kΩ/2-pF analog buffer, DDR LVDS output with selectable 200-mV/350-mV swing, 1.8-V/3.3-V dual-supply architecture, and VQFN-48 (7 mm × 7 mm) package with PowerPAD™ thermal pad.

Technical Context

The ADS41B49IRGZT employs a pipelined ADC architecture with on-chip analog input buffering to maintain constant 3-kΩ input resistance and 2-pF capacitance up to 200 MHz. Its differential clock inputs (CLKP/CLKM) support ac-coupled LVDS, LVPECL, or LVCMOS signals from 20 to 250 MSPS, with automatic low-power scaling below 80 MSPS.

Digital outputs use DDR LVDS with programmable output strength (100-Ω or 50-Ω termination) and swing (200 mV or 350 mV), enabling FPGA-compatible 500 MBPS data rates. Internal DC offset correction and gain control registers allow real-time SNR/SFDR trade-off tuning without external circuitry.

Key Specifications

Pinout & Package

VQFN-48 (RGZ) package with 7 mm × 7 mm body and thermally enhanced PowerPAD™ connected to DRGND. Pin 1 marked via top-side laser etch; pins 1–24 and 25–48 arranged in two opposing rows.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS41B49IRGZT, ADS42JB49IRGCT trades LVDS simplicity for JESD204B scalability and synchronization features, while AD9643BCPZ-250 offers higher SNR but lacks the integrated 3.3-V analog buffer-requiring external amplification for optimal wideband linearity.

Availability

ADS41B49IRGZT is available at Aetrix Electronics and suitable for wireless infrastructure, software-defined radio, and power amplifier linearization applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS41B49IRGZT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The ADS4xxx family-including ADS41B49IRGZT-is designed specifically for ultralow-power, high-dynamic-performance digitization in multi-carrier wireless infrastructure, where analog input buffering, flexible I/O, and thermal efficiency are critical.

FAQ

What is the maximum analog input frequency supported by the ADS41B49IRGZT?

The ADS41B49IRGZT supports analog input frequencies up to 600 MHz when using a 1-VPP differential input amplitude, and up to 400 MHz at full-scale 1.5-VPP input. Its analog input bandwidth is specified at 800 MHz, ensuring minimal roll-off within these operating ranges. These values are confirmed in Section 6.3 of the SBAS486F datasheet under Recommended Operating Conditions.

Does the ADS41B49IRGZT require an external reference voltage?

No, the ADS41B49IRGZT uses an internal reference and does not require an external reference voltage. The device integrates all necessary reference circuitry to support its 14-bit conversion accuracy across temperature and supply variations. This is explicitly stated in the "Features" section and confirmed in the "Electrical Characteristics" tables of the SBAS486F datasheet.

Can the ADS41B49IRGZT operate with only 1.8-V supplies, or is the 3.3-V AVDD_BUF rail mandatory?

The 3.3-V AVDD_BUF supply is mandatory for ADS41B49IRGZT operation because it powers the integrated high-impedance analog input buffer. The buffer is not functional with only 1.8-V supplies-the datasheet specifies AVDD_BUF = 3.0–3.6 V as a required operating condition. Omitting AVDD_BUF disables the buffer and invalidates key performance specs like input impedance and SNR.

What is the latency of the ADS41B49IRGZT, and is it fixed or configurable?

The ADS41B49IRGZT has a fixed latency of 21 clock cycles when gain correction is enabled (default after reset), and 22 cycles when both gain and offset correction are active. This latency is deterministic and independent of input signal characteristics. It is documented in Section 6.8 (Timing Requirements) and Figure 39 of the SBAS486F datasheet.

How does the integrated analog input buffer affect anti-alias filter design for the ADS41B49IRGZT?

The ADS41B49IRGZT's integrated buffer presents a constant 3-kΩ || 2-pF differential input impedance up to 200 MHz, decoupling filter design from ADC loading effects. This allows passive anti-alias filters to be designed once-without iterative tuning-and remain stable across frequency and process variation. The buffer eliminates group delay distortion introduced by active front-end drivers.