Texas Instruments ADS42JB49IRGCR

Overview

ADS42JB49IRGCR from Texas Instruments is a dual-channel, 14-bit, 250-MSPS analog-to-digital converter with JESD204B serial interface (subclass 0/1/2), 2–2.5 V_PP differential input range, 85 fS_rms aperture jitter, and 100 dB channel isolation-designed for high-frequency I/Q sampling in microwave receivers and multiband cellular infrastructure.

For engineers reviewing the ADS42JB49IRGCR datasheet, ADS42JB49IRGCR pinout, ADS42JB49IRGCR application, or ADS42JB49IRGCR equivalent, key selection criteria include JESD204B lane count (up to four lanes), 3.125 Gbps serial data rate, register-programmable input full-scale, and thermal performance in the 9-mm × 9-mm VQFN-64 package under industrial temperature conditions.

Technical Context

The ADS42JB49IRGCR employs a buffered analog front-end with high-impedance input (1.2 kΩ at 170 MHz) and low sample-and-hold glitch energy, enabling direct drive from RF baluns up to 900 MHz analog bandwidth. Its internal PLL supports 10× and 20× clock multiplication modes, and the sampling clock divider (÷1/÷2/÷4) decouples ADC timing from system clock architecture.

JESD204B output compliance includes subclass 0 (deterministic latency), subclass 1 (SYSREF-synchronized), and subclass 2 (SYNC~-triggered), with configurable lane count (two or four) and data rates up to 3.125 Gbps per lane. Latency is deterministic and register-adjustable-23 cycles typical in 10× mode, with <±70 ps inter-channel delay matching.

Key Specifications

Pinout & Package

ADS42JB49IRGCR is housed in a thermally enhanced 9-mm × 9-mm VQFN-64 package (RGC) with exposed thermal pad connected to ground plane. The package supports industrial temperature range (–40°C to +85°C) and requires controlled-impedance routing for JESD204B lanes and analog inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS42JB69IRGCR and ADS42LB49IRGCR, ADS42JB49IRGCR uniquely balances 250-MSPS speed, 14-bit linearity, and JESD204B deterministic latency-making it the preferred choice for next-generation multiband cellular and electronic warfare receivers requiring both bandwidth and timing predictability.

Availability

ADS42JB49IRGCR is available at Aetrix Electronics and suitable for communication infrastructure, radar signal processing, and software-defined radio applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing from authorized channels.

Supply support for ADS42JB49IRGCR 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 conversion technologies for industrial, automotive, and communications markets.

The ADS42JB49IRGCR belongs to TI's high-speed ADC portfolio designed specifically for demanding RF-sampling and IF-digitization applications-emphasizing JESD204B interoperability, low jitter, and robust analog front-end performance in compact packages.

FAQ

What is the maximum analog input frequency supported by the ADS42JB49IRGCR?

The ADS42JB49IRGCR supports up to 400 MHz maximum analog input frequency when using a 2-V_PP full-scale input, and up to 250 MHz with 2.5-V_PP. Its 900-MHz analog bandwidth (with 50-Ω termination) enables undersampling of IF signals in L- and S-band receivers. Performance metrics like SNR and SFDR are specified up to 230 MHz, confirming usability across wide instantaneous bandwidths in radar and broadband wireless systems. The ADS42JB49IRGCR maintains 72.7 dBFS SNR even at 170 MHz input.

Does the ADS42JB49IRGCR support JESD204B subclass 2 operation?

Yes, the ADS42JB49IRGCR fully supports JESD204B subclass 2, using the SYNC~P/M pins for deterministic latency alignment without requiring an external SYSREF signal. In subclass 2 mode, latency is fixed at 22–23 ADC clock cycles depending on configuration, with <±70 ps inter-channel matching. This makes the ADS42JB49IRGCR suitable for time-critical applications like phased-array radar where synchronous sampling across multiple converters is essential. The ADS42JB49IRGCR also supports subclass 0 and 1 for maximum system flexibility.

What power supply voltages does the ADS42JB49IRGCR require?

The ADS42JB49IRGCR requires four independent supplies: AVDD = 1.8 V (analog core), AVDD3V = 3.3 V (analog input buffer), DRVDD = 1.8 V (digital logic), and IOVDD = 1.8 V (JESD204B transmitter). Each supply must be independently decoupled with low-ESR capacitors near the respective pins. Total power consumption is 1.7–1.96 W at 250 MSPS, with 957 mW attributed to the AVDD3V rail driving the high-Z input buffer. The ADS42JB49IRGCR specifies strict PSRR (>40 dB) to ensure immunity to supply noise coupling into the analog path.

How is channel isolation achieved in the ADS42JB49IRGCR?

Channel isolation in the ADS42JB49IRGCR is achieved through physically separated analog front-end circuitry, dedicated clock distribution networks, and deep substrate isolation between the two 14-bit ADC cores. Measured at 100 dB at 170 MHz, this isolation prevents signal leakage from one channel to another-critical for I/Q imbalance correction and MIMO signal integrity. Layout best practices (e.g., separate AGND planes, guard traces) are recommended to maintain this spec in end equipment. The ADS42JB49IRGCR datasheet confirms 100 dB isolation across the full 20–230 MHz band.

Can the ADS42JB49IRGCR's input full-scale range be changed dynamically during operation?

Yes, the ADS42JB49IRGCR supports register-programmable differential input full-scale range of either 2 V_PP or 2.5 V_PP via its SPI interface-allowing dynamic adjustment without hardware modification. This feature enables real-time adaptation to varying signal amplitudes in SDR and cognitive radio systems. The change takes effect after register write and internal calibration, with no pipeline interruption. The ADS42JB49IRGCR maintains specified SNR and SFDR performance across both ranges, as verified in Tables 7.6 and 7.7 of the SLAS900F datasheet.