Texas Instruments ADS5242IPAPT

Overview

ADS5242IPAPT from Texas Instruments is a 4-channel, 12-bit, 65MSPS analog-to-digital converter with integrated PLL, simultaneous sample-and-hold, and serialized LVDS outputs. It delivers 70.8dBFS SNR at 10MHz IF, operates on 3.3V analog/digital supplies, and supports internal or external reference modes - used in portable ultrasound systems for high-density, low-power multichannel signal acquisition.

For engineers reviewing the ADS5242IPAPT datasheet, ADS5242IPAPT pinout, ADS5242IPAPT application, or ADS5242IPAPT equivalent, key selection criteria include LVDS serialization timing (LCLKP/LCLKN at 390MHz max), channel power-down control via serial interface, aperture jitter of 1ps, and HTQFP-64 PowerPAD™ package thermal performance (θJC = 14.5°C/W).

Technical Context

The ADS5242IPAPT integrates four independent 12-bit ADC cores sharing a common ADCLK input, each with dedicated differential analog inputs (INxP/INxN) and serialized LVDS data outputs (OUTxP/OUTxN). An on-chip PLL multiplies the sampling clock by 12 to generate high-frequency LVDS clocks (ADCLKP/ADCLKN and LCLKP/LCLKN) for data serialization and frame synchronization.

It employs straight offset binary output format, supports LSB-first or MSB-first serialization via register configuration, and provides programmable LVDS output current (2.5–6.0mA per channel) and dual clock drive modes (standard or doubled current for clock outputs). Internal reference mode yields 2.03VPP full-scale range; external reference allows FSR scaling via REFT/REFB pins.

Key Specifications

Pinout & Package

ADS5242IPAPT is housed in an HTQFP-64 PowerPAD™ package (6.5mm × 6.5mm body, 5.29mm × 5.29mm thermal pad min), with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation (θJC = 14.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel, high-speed ADC applications.

Compared with ADS5242IPAPT, ADS5240IPAPT trades speed for lower power and simpler clocking, while ADS58C23IRGCT upgrades resolution and interface but demands board redesign and new firmware stack - neither is pin-compatible, and both require signal chain revalidation.

Availability

ADS5242IPAPT is available at Aetrix Electronics and suitable for portable ultrasound systems, optical network monitoring equipment, and communications test instrumentation requiring stable component supply, long-term industrial temperature support, and proven LVDS interface reliability.

Supply support for ADS5242IPAPT 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, medical, and communications markets.

The ADS5242IPAPT belongs to TI's high-speed ADC product line, engineered for multichannel, low-power, LVDS-interfaced digitization in space- and thermal-constrained systems such as portable diagnostic equipment.

FAQ

What is the maximum sampling clock frequency supported by the ADS5242IPAPT?

The ADS5242IPAPT supports a maximum ADCLK input frequency of 65MHz, enabling full-rate operation at 65MSPS per channel. This is validated across the full operating temperature range (–40°C to +85°C) with AVDD and LVDD at 3.3V. Exceeding 65MHz violates the absolute maximum rating and may cause timing violations or data corruption in the LVDS serialization path.

Does the ADS5242IPAPT require external reference components when using internal reference mode?

No - the ADS5242IPAPT provides a fully trimmed internal reference generating 1.95V top (REFT) and 0.95V bottom (REFB) voltages, yielding a 2.03VPP full-scale range. In internal reference mode, REFT and REFB pins must be bypassed with ≥0.1µF capacitors to ground, but no external resistors or precision references are needed. The device draws 545mW analog power in this configuration.

How is channel synchronization achieved across the four ADCs in the ADS5242IPAPT?

Channel synchronization is achieved through simultaneous sample-and-hold operation triggered by a single ADCLK edge applied to all four ADC cores. The internal design ensures sub-picosecond inter-channel skew, verified by crosstalk measurement of –88dBc. No external alignment circuitry or calibration is required - the timing relationship is fixed in silicon and maintained across voltage and temperature.

Can the LVDS output current of the ADS5242IPAPT be adjusted per channel?

No - LVDS output current is configured globally via Register 0 and applies uniformly to all data outputs (OUT1P/N through OUT4P/N) and clock outputs (ADCLKP/N, LCLKP/N). Four settings are available: 2.5mA, 3.5mA (default), 4.5mA, or 6.0mA. Clock outputs can be driven at double current (7.0mA) independently via Register 1, but per-channel current tuning is not supported.

What is the function of the INT/EXT pin on the ADS5242IPAPT?

The INT/EXT pin (Pin 54) selects reference source: logic high (weak internal pull-up) enables internal reference mode (2.03VPP FSR); logic low configures external reference mode, where REFT and REFB pins accept externally supplied voltages (1.825–2.0V and 0.9–1.075V respectively) to set FSR = 2.03 × (REFT – REFB). VCM remains internally generated in both modes.