Texas Instruments ADC34J42IRGZT

Overview

ADC34J42IRGZT from Texas Instruments is a quad-channel, 14-bit, 50-MSPS analog-to-digital converter with JESD204B subclass 1 interface, 72.4 dBFS SNR at 70 MHz input, 105 dB channel isolation, and ultra-low power consumption of 491 mW total at 50 MSPS. It serves as the front-end digitizer in multi-channel RF receivers requiring precise time-aligned sampling and high dynamic range.

For engineers reviewing the ADC34J42IRGZT datasheet, ADC34J42IRGZT pinout, ADC34J42IRGZT application, or ADC34J42IRGZT equivalent, key selection criteria include its 50-MSPS sampling rate, VQFN-48 package with JESD204B lane-per-channel output, internal dither support, SYSREF-synchronized multi-chip timing, and differential analog input bandwidth up to 450 MHz.

Technical Context

The ADC34J42IRGZT implements four independent 14-bit SAR-based ADC cores with on-chip clock divider (÷1/÷2/÷4), internal PLL for JESD204B bit clock generation (20× multiplication), and configurable dither per channel. Its digital interface uses CML-level JESD204B lanes-four differential pairs (DAP/DAM, DBP/DBM, DCP/DCM, DDP/DDM)-each carrying one channel's serialized 14-bit data at up to 1.0 Gbps.

It supports multi-chip synchronization via dedicated SYSREFP/SYSREFM inputs and JESD204B subclass 1 deterministic latency control. Analog inputs accept 2-V_PP differential signals with 6.5-kΩ input resistance and 5.2-pF capacitance, referenced to VCM = 0.95 V, enabling direct coupling to transformer- or amplifier-driven RF paths.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel, 14-bit ADC applications.

Compared with ADC34J43IRGZT and ADS42JB69IRGCT, ADC34J42IRGZT uniquely balances 50-MSPS operation, 14-bit fidelity, 491-mW power, and JESD204B subclass 1 support-making it optimal for cost- and power-sensitive coherent multi-channel receivers where 25-MHz instantaneous bandwidth suffices.

Availability

ADC34J42IRGZT is available at Aetrix Electronics and suitable for radar front-ends, communications test instrumentation, motor control feedback systems, and software-defined radio platforms requiring stable component supply, long-term obsolescence planning, and traceable sourcing.

Supply support for ADC34J42IRGZT 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 infrastructure markets.

The ADC34J4x family was designed for high-density, multi-channel RF digitization in space- and power-constrained systems-emphasizing JESD204B interface efficiency, channel isolation, and flexible clocking for cellular base stations, radar, and test equipment.

FAQ

What is the maximum sampling rate supported by ADC34J42IRGZT?

The ADC34J42IRGZT is rated for a maximum sampling rate of 50 MSPS, as specified in its electrical characteristics table. This is the fixed top-end performance point for this specific variant within the ADC34J4x family-distinct from the ADC34J43 (80 MSPS), ADC34J44 (125 MSPS), and ADC34J45 (160 MSPS). Operation above 50 MSPS is not guaranteed or characterized.

Does ADC34J42IRGZT support JESD204B subclass 1 for deterministic latency?

Yes, ADC34J42IRGZT fully supports JESD204B subclass 1, including SYNC~ inputs (SYNCP~/SYNCM~), SYSREF inputs (SYSREFP/SYSREFM), and frame alignment logic. This enables deterministic latency and precise multi-device synchronization-critical for phased-array radar and MIMO communications systems where sample alignment across multiple ADCs must be maintained within one clock cycle.

What analog input configuration does ADC34J42IRGZT require?

ADC34J42IRGZT requires differential analog inputs (e.g., INAP/INAM for Channel A) with a 2-V_PP full-scale range, 6.5-kΩ differential input resistance, and 5.2-pF input capacitance. The common-mode voltage is internally generated at 0.95 V (VCM pin), but external biasing is also supported. AC coupling via 100-Ω series termination is recommended for RF inputs up to 450 MHz.

How does internal dither improve ADC34J42IRGZT performance?

Internal dither in ADC34J42IRGZT injects controlled noise to randomize quantization error, reducing harmonic distortion and improving SFDR-especially at low-input frequencies. When enabled per channel (via register 01h bits [7:0]), it increases SFDR by up to 5 dBc at 10 MHz and enhances spurious-free dynamic range in spectrum analysis and communications test applications.

Is ADC34J42IRGZT pin-compatible with other devices in the ADC34J4x family?

Yes, ADC34J42IRGZT is pin-to-pin compatible with ADC34J43IRGZT, ADC34J44IRGZT, and ADC34J45IRGZT in the VQFN-48 (RGZ) package. All share identical pin functions, power domains (AVDD/DVDD), JESD204B lane assignments, and control interfaces-allowing drop-in replacement for sampling rate upgrades without PCB redesign.