Texas Instruments ADC32J24IRGZT

Overview

ADC32J24IRGZT from Texas Instruments is a dual-channel, 12-bit, 125-MSPS analog-to-digital converter with JESD204B subclass 0/1/2 serial interface, 70.3 dBFS SNR at 70 MHz input, 227 mW/channel power consumption, and 105 dB channel isolation - designed for high-dynamic-range RF sampling in microwave receivers and SDR front-ends.

For engineers reviewing the ADC32J24IRGZT datasheet, ADC32J24IRGZT pinout, ADC32J24IRGZT application, or ADC32J24IRGZT equivalent, this page delivers verified specifications, VQFN-48 package layout, JESD204B lane timing constraints, multichip synchronization support via SYSREF, and real-world trade-offs versus ADC32J25 and ADC32J23 for radar and base station signal chain design.

Technical Context

The ADC32J24IRGZT integrates two independent 12-bit ADC cores sharing a single 1.8-V analog supply (AVDD) and digital supply (DVDD), each with dedicated differential analog inputs (INAP/INAM, INBP/INBM) and JESD204B serializer outputs (DAP/DAM, DBP/DBM). Its internal PLL multiplies the input sampling clock by 20 to generate the 3.2-Gbps bit clock required for JESD204B transmission.

It supports flexible clocking via a programmable divide-by-1/2/4 input buffer, enables system-level synchronization using differential SYSREFP/SYSREFM inputs compliant with JESD204B subclass 1, and provides overrange detection per channel (OVRA/OVRB) plus common-mode voltage output (VCM) for input biasing - all within a thermally optimized 7 mm × 7 mm VQFN-48 package with exposed thermal pad.

Key Specifications

Pinout & Package

Package: VQFN-48 (7 mm × 7 mm) with exposed thermal pad on backside - optimized for low-inductance grounding and thermal dissipation in RF PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC32J25IRGZT and ADC32J23IRGZT, the ADC32J24IRGZT delivers optimal balance of bandwidth (125 MSPS), power (401 mW), and RF performance (70.3 dBFS SNR) for mid-tier communications infrastructure - avoiding overdesign while maintaining margin for demanding microwave receiver applications.

Availability

ADC32J24IRGZT is available at Aetrix Electronics and suitable for microwave receivers, software-defined radios, radar signal processing, and communications test equipment requiring stable component supply across extended production lifecycles.

Supply support for ADC32J24IRGZT 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 ADC32J2x family was engineered for high-dynamic-range, low-power RF sampling in wireless infrastructure - delivering JESD204B integration, multichip synchronization, and ultralow power per channel without sacrificing SNR or linearity.

FAQ

What is the maximum sampling rate supported by the ADC32J24IRGZT?

The ADC32J24IRGZT supports a maximum sampling rate of 125 MSPS, as specified in its electrical characteristics table (Section 7.7 of SBAS668A). This rate is fixed for the ADC32J24 variant and differs from the 160 MSPS capability of the ADC32J25IRGZT. Operation above 125 MSPS is not guaranteed and may result in degraded AC performance or functional failure.

Does the ADC32J24IRGZT require an external clock source, and what are the input requirements?

Yes, the ADC32J24IRGZT requires a differential clock input applied to CLKP/CLKM pins. It accepts sine wave (1.5 V_PP), LVDS (0.7 V_PP), or LPECL (1.6 V_PP) signals. With the internal divider set to ÷1, a 125-MHz clock yields 125-MSPS sampling; ÷2 mode allows 250-MHz input for same rate. Duty cycle must be 50%, and common-mode voltage must be 0.95 V.

How does the JESD204B interface of the ADC32J24IRGZT operate in subclass 1 mode?

In subclass 1 mode, the ADC32J24IRGZT uses SYSREFP/SYSREFM and SYNCM~/SYNCP~ to align lane alignment sequences (LAS) and achieve deterministic latency. The device latches SYSREF edges relative to the local clock, enabling precise timing coordination across multiple ADCs and FPGAs - critical for beamforming and MIMO systems where phase coherence is mandatory.

What is the purpose of the VCM pin on the ADC32J24IRGZT, and how should it be used?

The VCM pin on the ADC32J24IRGZT outputs a stable 0.95-V common-mode voltage used to bias external differential analog drivers or baluns. It eliminates the need for external resistor networks to establish input common-mode level, simplifying layout and improving matching between INAP/INAM and INBP/INBM paths - directly contributing to higher channel isolation and lower even-order distortion.

Can the ADC32J24IRGZT be powered down to reduce system power consumption?

Yes, the ADC32J24IRGZT supports two power-down modes: global power-down (5 mW total) activated via PDN pin, and standby power-down (112 mW total) entered through SPI register control. Wake-up times are 85 µs from global mode and 35 µs from standby mode - enabling rapid reactivation for burst-mode receivers or energy-aware test instrumentation.