Texas Instruments ADS6142IRHBT

Overview

ADS6142IRHBT from Texas Instruments is a 14-bit, 65 MSPS analog-to-digital converter with DDR LVDS or parallel CMOS digital outputs, internal reference, and programmable coarse/fine gain. It delivers 74.6 dBFS SINAD at 10 MHz input (0 dB gain), 84 dBc SFDR at 170 MHz (3.5 dB gain), and operates from 3.3-V analog and 1.8–3.3-V digital supplies in industrial temperature range (–40°C to 85°C). It is used in software-defined radio baseband receivers requiring high dynamic range at moderate sampling rates.

For engineers reviewing the ADS6142IRHBT datasheet, ADS6142IRHBT pinout, ADS6142IRHBT application, or ADS6142IRHBT equivalent, key selection criteria include its 65 MSPS maximum sample rate, 14-bit no-missing-codes resolution, LVDS/CMOS interface flexibility, 3.5 dB coarse + up to 6 dB fine gain programmability, and QFN-32 package compatibility with the ADS614X family.

Technical Context

The ADS6142IRHBT employs a high-bandwidth sample-and-hold circuit and low-jitter clock buffer to maintain 71.5 dBFS SINAD and 84 dBc SFDR at 170 MHz input with 3.5 dB coarse gain. Its dual-output architecture supports either DDR LVDS (3.3-V DRVDD, 100-Ω termination) or parallel CMOS (1.8–3.3-V DRVDD), with programmable output clock position, drive strength, and internal termination.

Configuration is achieved via 3-wire serial interface (SEN/SCLK/SDATA) or dedicated parallel pins for power-up state control-enabling immediate operation without register programming. The device integrates an internal 1-V to 2-V reference, eliminating external decoupling, while supporting external reference mode with 1.45–1.55 V common-mode voltage.

Key Specifications

Pinout & Package

The ADS6142IRHBT is housed in a 32-pin QFN package (5 mm × 5 mm) with exposed thermal pad, θ_JA = 34 °C/W (0 LFM), and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution ADC applications.

Compared with ADS6143IRHBT and ADS5272IPFP, the ADS6142IRHBT offers the lowest power among the ADS614X family at 65 MSPS while retaining full programmability and integrated reference-making it optimal for thermally constrained, medium-bandwidth SDR and instrumentation designs.

Availability

ADS6142IRHBT is available at Aetrix Electronics and suitable for software-defined radio, test and measurement instrumentation, and power amplifier linearization requiring stable component supply, long-term production continuity, and industrial-grade temperature performance.

Supply support for ADS6142IRHBT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The ADS614X family-including ADS6142IRHBT-is designed for high-performance data acquisition in radar, communications, and instrumentation, balancing resolution, speed, power, and integration in compact QFN packages.

FAQ

What is the maximum sampling rate supported by the ADS6142IRHBT?

The ADS6142IRHBT supports a maximum sampling rate of 65 MSPS, as specified in the datasheet's recommended operating conditions and electrical characteristics tables. This rate is validated across the full industrial temperature range (–40°C to +85°C) with AVDD = 3.3 V and proper clock signal integrity. Exceeding this rate may result in degraded AC performance including reduced SFDR and increased aperture jitter. The ADS6142IRHBT is the lowest-speed variant in the ADS614X family, optimized for power efficiency at this sample rate.

Does the ADS6142IRHBT require external decoupling capacitors for its internal reference?

No, the ADS6142IRHBT does not require external decoupling capacitors for its internal reference. As confirmed in the datasheet's "Features" and "Electrical Characteristics" sections, the device eliminates traditional reference pins and associated external decoupling. The internal reference (VREFB = 1 V, VREFT = 2 V) is fully self-contained, and the VCM pin serves only for external reference mode. This reduces BOM count and PCB area, particularly beneficial in space-constrained RF modules where the ADS6142IRHBT is commonly deployed.

Can the ADS6142IRHBT operate with a 1.8-V digital supply in LVDS mode?

No, the ADS6142IRHBT requires a 3.3-V DRVDD supply for LVDS operation, as explicitly stated in the "Recommended Operating Conditions" table. While the device supports 1.8–3.3-V DRVDD for CMOS interface, LVDS mode mandates DRVDD = 3.0–3.6 V to ensure proper LVDS output voltage levels (VOD = 225–350 mV, VOS = 1200 mV). Using 1.8 V with LVDS would violate absolute maximum ratings and result in noncompliant signaling, data corruption, or device damage.

How is gain configured on the ADS6142IRHBT-via serial interface or hardware pins?

Gain on the ADS6142IRHBT can be configured either way: coarse gain (0 dB or 3.5 dB) is set using the SCLK pin voltage level in parallel mode, while fine gain (0–6 dB in 0.5-dB steps) is programmed exclusively via the 3-wire serial interface (SEN/SCLK/SDATA). The datasheet's Table 1 confirms SCLK at AVDD selects 3.5 dB coarse gain with internal reference. Fine gain register (0x0C) is inaccessible via pins-requiring serial write. This dual-path design enables simple power-up configuration and precise runtime adjustment.

What is the latency of the ADS6142IRHBT in DDR LVDS mode?

The ADS6142IRHBT has a fixed latency of 9 clock cycles in both DDR LVDS and parallel CMOS modes, as shown in Figure 1 ("Latency") and confirmed in the "Timing Characteristics" table. This latency is deterministic and independent of sample rate within the device's operating range (1–65 MSPS). For a 65 MSPS clock, the total pipeline delay is approximately 138.5 ns. This value is critical for time-sensitive applications like digital predistortion, where consistent ADC-to-DSP timing alignment must be maintained across temperature and voltage variations.