Texas Instruments ADC32J42IRGZT

Overview

ADC32J42IRGZT from Texas Instruments is a dual-channel, 14-bit, 50-MSPS analog-to-digital converter with JESD204B serial interface, 72.2 dBFS SNR at 70 MHz input, 227 mW/channel power consumption, and VQFN-48 package. It serves as a high-linearity front-end digitizer in microwave receivers and radar signal chains requiring precise wideband sampling.

For engineers reviewing the ADC32J42IRGZT datasheet, ADC32J42IRGZT pinout, ADC32J42IRGZT application, or ADC32J42IRGZT equivalent, key selection criteria include its 50-MSPS sampling rate, JESD204B Subclass 0/1/2 compliance up to 3.2 Gbps, 105 dB channel isolation, internal dither support, and SYSREF-enabled multichip synchronization capability.

Technical Context

The ADC32J42IRGZT integrates two independent 14-bit ADC cores sharing a common 1.8-V analog supply (AVDD) and digital supply (DVDD), with separate differential analog inputs (INAP/INAM for Channel A; INBP/INBM for Channel B) and dedicated JESD204B lanes (DAP/DAM for A; DBP/DBM for B). Its internal PLL multiplies the input sampling clock by 20 to generate the bit clock for serialization.

It supports flexible clocking via a programmable input divider (÷1, ÷2, ÷4), accepts LVDS/LVPECL differential clock inputs, and uses external SYSREFP/SYSREFM signals for deterministic latency alignment across multiple devices-critical for phased-array radar and SDR systems requiring tight timing coherence.

Key Specifications

Pinout & Package

VQFN-48 (7 mm × 7 mm) package with exposed thermal pad on backside; RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, JESD204B ADC applications.

Compared with ADC32J43IRGZT and ADS42JB49IRGCT, ADC32J42IRGZT offers optimal balance of 50 MSPS sampling, ultra-low power (140 mW typical), and minimal board space-making it ideal for cost- and size-constrained embedded systems where extreme bandwidth is unnecessary.

Availability

ADC32J42IRGZT is available at Aetrix Electronics and suitable for radar signal processing, motor control feedback loops, and communications test equipment requiring stable component supply and long-term industrial availability.

Supply support for ADC32J42IRGZT 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, specializing in analog and embedded processing technologies with over 90 years of innovation in precision data conversion.

The ADC32J4x family-including ADC32J42IRGZT-is designed for high-dynamic-range, low-power digitization in next-generation wireless infrastructure, defense electronics, and industrial automation systems demanding JESD204B interoperability.

FAQ

What is the maximum sampling rate supported by the ADC32J42IRGZT?

The ADC32J42IRGZT supports a maximum sampling rate of 50 MSPS, as confirmed in Section 7.7 of the SBAS663A datasheet. This rate is fixed for this variant-unlike higher-speed members of the ADC32J4x family (e.g., ADC32J43 at 80 MSPS), the ADC32J42IRGZT is specifically characterized and guaranteed for operation up to 50 MSPS under all recommended operating conditions including AVDD = DVDD = 1.8 V and T_A = –40°C to 85°C.

Does the ADC32J42IRGZT require an external clock source, and what are the acceptable input formats?

Yes, the ADC32J42IRGZT requires an external differential clock applied to CLKP/CLKM pins. It accepts LVDS (0.7 V differential) or LVPECL (1.6 V differential) ac-coupled signals per Section 7.3, with input frequency matching the desired sampling rate (e.g., 50 MHz for 50 MSPS). The internal clock divider supports ÷1, ÷2, or ÷4 configurations, allowing flexibility in system clock tree design without needing a dedicated 50 MHz oscillator.

How does the JESD204B interface on the ADC32J42IRGZT reduce system complexity compared to parallel LVDS outputs?

The JESD204B interface on the ADC32J42IRGZT replaces 28+ parallel LVDS data lines (for dual 14-bit channels) with just two differential pairs per channel (DAP/DAM for A; DBP/DBM for B), cutting PCB routing layers and EMI emissions. Each lane operates up to 3.2 Gbps, serializing 14-bit samples with embedded framing and error detection-enabling direct FPGA connection with minimal logic resources and eliminating timing-skew compensation circuits required for wide parallel buses.

Can the ADC32J42IRGZT be used in multichip synchronization applications, and what pins enable this functionality?

Yes, the ADC32J42IRGZT supports multichip synchronization via its dedicated SYSREFP and SYSREFM differential input pins, which align internal sampling phases and JESD204B frame boundaries across multiple devices. When combined with JESD204B Subclass 1 operation, this enables deterministic latency-critical for phased-array radar and beamforming systems where sub-nanosecond timing coherence between ADCs is mandatory for accurate spatial signal processing.

What is the purpose of the VCM pin on the ADC32J42IRGZT, and how should it be used in circuit design?

Pin 24 (VCM) on the ADC32J42IRGZT provides a buffered 0.95 V common-mode voltage output for biasing differential analog input pairs (INAP/INAM and INBP/INBM). It eliminates the need for external resistor dividers or op-amp buffers when interfacing with transformer-coupled or amplifier-driven inputs. The datasheet specifies ±10 mA drive capability, allowing direct connection to multiple input stages while maintaining stable common-mode reference across temperature and process variation.