Texas Instruments ADS5545IRGZT

Overview

ADS5545IRGZT from Texas Instruments is a 14-bit, 170 MSPS analog-to-digital converter with DDR LVDS and parallel CMOS output options, internal sample-and-hold, programmable gain up to 6 dB, and 74-dBFS SNR at 70-MHz IF. It operates from 3.3-V analog and digital supplies in a 48-pin QFN package and targets high-IF wireless infrastructure receivers.

For engineers reviewing the ADS5545IRGZT datasheet, ADS5545IRGZT pinout, ADS5545IRGZT application, or ADS5545IRGZT equivalent, key selection criteria include its 11.4 ENOB at 70-MHz IF, 85-dBc SFDR at 0 dB gain, support for input clock amplitudes as low as 400 mVPP, DDR LVDS timing flexibility via programmable output clock position, and dual reference mode (internal/external) without external decoupling.

Technical Context

The ADS5545IRGZT employs an advanced pipeline ADC architecture with integrated sample-and-hold and low-jitter clock buffer to maintain high SNR and SFDR at RF input frequencies up to 300 MHz. Its analog input bandwidth is 500 MHz (–3 dB), and it supports differential input voltage ranges of 2 VPP with common-mode voltage fixed at 1.5 V.

Digital interface flexibility includes selectable DDR LVDS or parallel CMOS outputs, programmable data format (2's complement or offset binary), and configurable output clock edge positioning to optimize setup/hold timing margins. Power scaling modes reduce total dissipation to 100 mW in standby while preserving performance at lower sampling rates (1–60 MSPS).

Key Specifications

Pinout & Package

The ADS5545IRGZT is housed in a thermally enhanced 48-pin QFN package (7 mm × 7 mm) with exposed thermal pad, θ_JA = 25.4°C/W (0 LFM), and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS5545IRGZT, ADS5560IRGZT trades 30 MSPS speed for 2 extra bits and better DC accuracy, while AD9246BCPZ-125 sacrifices 45 MSPS and LVDS flexibility for reduced power and smaller footprint-neither matches the ADS5545IRGZT's combination of 170 MSPS, DDR LVDS, and programmable IF optimization.

Availability

ADS5545IRGZT is available at Aetrix Electronics and suitable for wireless infrastructure, radar signal processing, and high-definition video capture requiring stable component supply across extended industrial temperature ranges (–40°C to 85°C).

Supply support for ADS5545IRGZT 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 ADS5545IRGZT belongs to TI's high-speed ADC portfolio designed specifically for demanding IF-sampling applications in wireless infrastructure and defense electronics, emphasizing RF performance, power efficiency, and interface flexibility.

FAQ

What is the maximum analog input frequency supported by the ADS5545IRGZT?

The ADS5545IRGZT specifies an analog input bandwidth of 500 MHz (–3 dB) with 50-Ω source impedance. It maintains 74-dBFS SNR and 85-dBc SFDR up to 100 MHz input frequency, and usable performance (≥70-dBFS SNR) extends to 300 MHz. This makes ADS5545IRGZT suitable for direct sampling of L-band and S-band IF signals without external bandpass filtering.

Does the ADS5545IRGZT require external decoupling capacitors for its internal reference?

No, the ADS5545IRGZT eliminates the need for external reference decoupling capacitors. Its integrated reference architecture provides stable 2.0-V reference span (VREFT – VREFB) with ±25-mV error over temperature, and the VCM pin delivers 1.5-V common-mode bias with ±4-mA drive capability-enabling compact, capacitor-free reference design.

How does the programmable output clock position benefit FPGA-based data capture with the ADS5545IRGZT?

The ADS5545IRGZT allows fine adjustment of the CLKOUTP/CLKOUTM edge relative to DDR data transitions in 1/12-Ts increments. This resolves FPGA setup/hold timing violations without altering PCB layout or adding delay elements-critical when interfacing with Xilinx or Intel FPGAs where clock/data skew margins are tight at 170 MSPS DDR rates.

Can the ADS5545IRGZT operate at sampling rates below 50 MSPS, and what power savings result?

Yes, the ADS5545IRGZT supports low-speed mode (1–60 MSPS) via the SCLK pin or serial register control. In this mode, total supply current drops to 150 mA (vs. 332 mA at 170 MSPS), reducing power dissipation from 1.1 W to ~500 mW while preserving full 14-bit resolution, no missing codes, and 74-dBFS SNR-ideal for battery-powered test gear and medical ultrasound.

What are the valid input clock amplitude ranges for the ADS5545IRGZT in LVDS mode?

In LVDS mode, the ADS5545IRGZT accepts differential input clock amplitudes from 0.7 VPP to 1.5 VPP (sine wave, ac-coupled). The device includes a clock duty cycle stabilizer that corrects input duty cycles from 35% to 65%, ensuring robust timing margin even with imperfect clock sources-a key reliability feature for wireless infrastructure deployments.