Texas Instruments ADS6445IRGCR

Overview

ADS6445IRGCR from Texas Instruments is a quad-channel, 14-bit, 125 MSPS analog-to-digital converter with serial LVDS outputs, internal PLL clock multiplication, and programmable coarse/fine gain. It operates from 3.3-V analog and digital supplies, features simultaneous sample-and-hold across all channels, and delivers 73.4 dBFS SINAD at 10 MHz input with 0 dB gain - used in high-density IF sampling systems for wireless base stations.

For engineers reviewing the ADS6445IRGCR datasheet, ADS6445IRGCR pinout, ADS6445IRGCR application, or ADS6445IRGCR equivalent, this page provides verified technical context, validated pin functions, confirmed performance trade-offs (SFDR/SNR vs. gain), and real-world interface constraints including LVDS serialization mode selection, frame/bit clock timing, and parallel/serial configuration priority rules.

Technical Context

The ADS6445IRGCR implements a 2-wire DDR LVDS output interface where each of four 14-bit ADC channels is serialized into two differential pairs, limiting bit rate to <1 Gbps. An internal PLL multiplies the input sampling clock to generate the LVDS bit clock and frame clock, both transmitted as LVDS signals.

It supports dual configuration modes: parallel pin control (CFG1–CFG4, SEN, PDN) for hardware-set defaults at power-up, and SPI-compatible serial register programming (SEN/SCLK/SDATA) with configurable priority via the bit - enabling flexible system-level initialization without firmware dependency.

Key Specifications

Pinout & Package

ADS6445IRGCR is housed in a thermally enhanced 64-pin QFN package (RGC designation) with exposed thermal pad, θ_JA = 23.17 °C/W (0 LFM), and JEDEC-compliant 3″ × 3″ four-layer board reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS6444IRGCR and ADS6245IRGCT, the ADS6445IRGCR uniquely delivers 125 MSPS quad-channel sampling with programmable gain and 2-wire DDR LVDS - making it optimal for next-generation wideband IF receivers where channel count, speed, and dynamic range are simultaneously critical.

Availability

ADS6445IRGCR is available at Aetrix Electronics and suitable for base-station IF receivers, diversity antenna systems, medical ultrasound front-ends, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS6445IRGCR 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 RF signal chain solutions.

The ADS644X family was designed specifically for high-density, multi-channel IF sampling in wireless infrastructure and instrumentation - emphasizing LVDS interface scalability, low-latency deterministic timing, and flexible hardware/firmware configurability.

FAQ

What is the maximum sampling rate supported by the ADS6445IRGCR?

The ADS6445IRGCR supports a maximum sampling rate of 125 MSPS, as specified in the SLAS531B datasheet. This rate applies across all four channels simultaneously with guaranteed AC performance including 73.4 dBFS SINAD and 79 dBc SFDR at 170 MHz input frequency using 3.5 dB coarse gain. The device maintains this specification over the full industrial temperature range (–40°C to +85°C) with 3.3-V supplies.

Does the ADS6445IRGCR require external decoupling capacitors for its internal reference?

No, the ADS6445IRGCR does not require external decoupling capacitors for its internal reference - a key design feature confirmed in the datasheet's "FEATURES" section. The internal reference (1.0 V to 2.0 V) is fully self-contained and stable across temperature, with only ±15 mV error over –40°C to +85°C. This eliminates associated BOM cost and PCB area while simplifying layout.

How does the 2-wire DDR LVDS interface of the ADS6445IRGCR reduce system complexity?

The 2-wire DDR LVDS interface of the ADS6445IRGCR halves the serial data rate compared to a 1-wire implementation - e.g., at 125 MSPS, each channel's 14-bit data is serialized across two differential pairs instead of one, keeping bit rates below 1 Gbps. This eases FPGA receiver design, reduces trace count, improves signal integrity, and lowers EMI - directly enabling compact, high-channel-count RF module layouts.

Can the ADS6445IRGCR operate with an external reference, and what voltage range is supported?

Yes, the ADS6445IRGCR supports external reference mode via the REFP/REFM pins and VCM terminal. In this mode, the applied reference must be 1.45 V to 1.55 V (nominal 1.5 V) with VCM driven to match. The SEN pin voltage selects between internal/external reference and coarse gain settings - (3/8)LVDD enables external reference with 3.5 dB gain, while LVDD selects internal reference with 0 dB gain.

What is the ADC latency of the ADS6445IRGCR, and how is it distributed?

The ADS6445IRGCR has a total ADC latency of 12 clock cycles, as shown in Figure 1 of the datasheet. This includes fixed analog pipeline delay plus serializer latency dependent on interface mode - 12 cycles is guaranteed for the default 2-wire DDR configuration. Latency remains constant across sampling rates (5–125 MSPS) and is deterministic, enabling precise timing alignment in closed-loop RF systems and digital predistortion feedback paths.