Texas Instruments ADS42JB49IRGC25

Overview

ADS42JB49IRGC25 from Texas Instruments is a dual-channel, 14-bit, 250-MSPS analog-to-digital converter (ADC) with JESD204B serial interface (subclass 0/1/2), 2–2.5 V_PP differential input range, and 85 fS_rms aperture jitter. It delivers 74 dBFS SNR at 170 MHz input (2.5 V_PP, –1 dBFS) and supports microwave I/Q receiver architectures requiring high channel isolation (100 dB) and low crosstalk.

For engineers reviewing the ADS42JB49IRGC25 datasheet, ADS42JB49IRGC25 pinout, ADS42JB49IRGC25 application, or ADS42JB49IRGC25 equivalent, key selection criteria include JESD204B lane count (up to four lanes), 3.125 Gbps serial data rate, flexible clock divider (×1/×2/×4), analog input buffer impedance stability up to 900 MHz, and thermal performance in the 9-mm × 9-mm VQFN-64 package.

Technical Context

The ADS42JB49IRGC25 implements a dual-sampling architecture with independent analog front-ends per channel, each featuring a high-impedance buffered input and register-programmable full-scale voltage (2 V_PP or 2.5 V_PP). Its internal PLL supports 10× or 20× multiplication of the input clock for JESD204B serializer timing.

JESD204B output uses LVDS-compatible CML drivers with programmable subclass operation (0, 1, or 2), SYSREF synchronization inputs, and SYNC~ control for deterministic latency alignment. Latency is fixed at 23 ADC clock cycles in 10× mode and includes configurable overrange indication (OVRA/OVRB) with CMOS outputs.

Key Specifications

Pinout & Package

ADS42JB49IRGC25 is housed in a thermally enhanced 9-mm × 9-mm VQFN-64 package (RGC) with exposed thermal pad connected to ground. The package supports standard reflow profiles and provides low thermal resistance (R_θJA = 22.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS42JB69IRGC25, the ADS42JB49IRGC25 trades 2-bit resolution for lower power and reduced FPGA resource usage; compared with ADS42LB49IRGC25, it doubles sampling rate and adds JESD204B deterministic latency-critical for 5G NR and phased-array radar.

Availability

ADS42JB49IRGC25 is available at Aetrix Electronics and suitable for communication infrastructure, radar signal processing, and microwave receiver designs requiring stable component supply, long-term obsolescence planning, and traceable sourcing from authorized channels.

Supply support for ADS42JB49IRGC25 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 ADS42JBxx family was designed specifically for high-speed, high-linearity digitization in wireless infrastructure and defense electronics-emphasizing JESD204B interoperability, thermal efficiency in dense RF modules, and robustness in extended temperature environments.

FAQ

What is the maximum analog input frequency supported by the ADS42JB49IRGC25?

The ADS42JB49IRGC25 supports up to 400 MHz with a 2-V_PP input amplitude and 250 MHz with a 2.5-V_PP input amplitude, as specified in the Recommended Operating Conditions table. Its analog input bandwidth is 900 MHz, enabling high-IF sampling strategies in microwave receivers. Performance metrics such as SNR and SFDR are characterized up to 230 MHz, with usable spurious-free operation confirmed to 300 MHz per FFT plots in the datasheet.

Does the ADS42JB49IRGC25 require external reference voltage or biasing?

No-the ADS42JB49IRGC25 integrates an internal reference and generates its own 1.9-V common-mode output (VCM pin) for analog input biasing. External references are not required; however, the VCM pin must be properly decoupled and may drive external balun center taps. The device's EGREF specification shows ±2% full-scale gain error from internal reference inaccuracy alone.

How does the JESD204B subclass selection affect system timing in the ADS42JB49IRGC25?

Subclass 0 requires no SYSREF and offers simplest implementation but lacks deterministic latency. Subclass 1 uses SYSREF for initial alignment and enables repeatable latency across power cycles. Subclass 2 uses continuous SYSREF for real-time multidevice sync-essential for TDD systems. The ADS42JB49IRGC25 supports all three; subclass choice is register-configurable and impacts SYNC~ and SYSREF pin usage per the functional block diagram.

What is the power-up sequence requirement for the ADS42JB49IRGC25?

The ADS42JB49IRGC25 does not require strict power-supply sequencing. All supplies (AVDD, AVDD3V, DRVDD, IOVDD) may be ramped simultaneously within recommended operating ranges. However, the first reset after power-up must be performed using the hardware RESET pin (active-high, internal 150-kΩ pull-down), not just power cycling-per Section 7.3 of the datasheet.

Can the ADS42JB49IRGC25 operate with a single-ended clock input?

No-the ADS42JB49IRGC25 requires a differential clock input (CLKINP/CLKINM). Single-ended sources must be converted using a balun or differential amplifier. The datasheet specifies minimum differential clock amplitudes: 0.3 V_PP for sine-wave inputs, 1.6 V_PP for LVPECL, 0.7 V_PP for LVDS, and 1.5 V for LVCMOS (single-ended, ac-coupled)-but all must be applied differentially across the CLKINP/M pins.