Texas Instruments ADS5277IPFPT

Overview

ADS5277IPFPT from Texas Instruments is an 8-channel, 10-bit, 65MSPS analog-to-digital converter with integrated PLL, simultaneous sample-and-hold, and serialized LVDS outputs. It delivers 61.7dBFS SNR at 5MHz IF, operates from 3.3V analog/digital supplies, and supports internal or external reference modes. It targets high-density portable ultrasound systems requiring low-power, multi-channel digitization.

For engineers reviewing the ADS5277IPFPT datasheet, ADS5277IPFPT pinout, ADS5277IPFPT application, or ADS5277IPFPT equivalent, this page provides verified technical context, real-world timing behavior, confirmed LVDS serialization format (12-bit word, LSB-first), validated power dissipation (911mW internal ref), and exact HTQFP-80 PowerPAD™ package mapping - all extracted from TI SBAS333D Rev. January 2009.

Technical Context

The ADS5277IPFPT integrates eight independent 10-bit ADC cores with simultaneous sampling, each feeding a dedicated LVDS serializer. An on-chip PLL multiplies the ADCLK input by 12× to generate 390MHz LCLK for serialization, while maintaining 65MSPS per channel sampling rate.

Each channel outputs a 12-bit LVDS word (10 data bits + 2 LSB zeros), with separate OUTP/OUTN pairs, plus dedicated LCLKP/LCLKN and ADCLKP/ADCLKN differential clocks. Control is via 3-wire SPI (SCLK/SDATA/CS), supporting register configuration of LVDS current (2.5–6.0mA), LSB/MSB mode, and per-channel power-down.

Key Specifications

Pinout & Package

ADS5277IPFPT is housed in an HTQFP-80 PowerPAD™ package (8mm × 8mm, 0.5mm pitch) with exposed thermal pad (4.69mm × 4.69mm min). The package supports high thermal conductivity for sustained 65MSPS operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel ADC applications.

Compared with ADS5277IPFPT, ADS5272IPFPT trades 2 extra bits and +31% power for higher SNR, while ADS5273IPFPT adds 5MSPS speed at the cost of stricter jitter tolerance - neither is pin-compatible nor functionally interchangeable without redesign.

Availability

ADS5277IPFPT is available at Aetrix Electronics and suitable for portable ultrasound systems, automated test equipment, tape drive read channels, and medical imaging data acquisition requiring stable component supply over extended production lifecycles.

Supply support for ADS5277IPFPT 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 and embedded processing technologies, with decades of expertise in high-performance data converters and signal chain solutions.

The ADS5277IPFPT belongs to TI's high-speed, multi-channel ADC product line designed specifically for portable medical imaging, test instrumentation, and industrial sensing where simultaneous sampling, low power, and compact LVDS interfacing are critical.

FAQ

What is the maximum sampling rate supported by the ADS5277IPFPT?

The ADS5277IPFPT supports a maximum sampling rate of 65MSPS per channel, with all eight channels operating simultaneously. This rate is validated across the full –40°C to +85°C temperature range and is dependent on stable 65MHz ADCLK input with 45–55% duty cycle. At this rate, the device achieves 61.7dBFS SNR at 5MHz input frequency using internal reference mode.

Does the ADS5277IPFPT include an integrated PLL, and what is its multiplication factor?

Yes, the ADS5277IPFPT includes an integrated PLL that multiplies the incoming ADCLK input by exactly 12×. This generates the 390MHz LCLK used for LVDS serialization while maintaining 65MSPS sampling - eliminating the need for external clock synthesis and reducing system-level jitter sensitivity. The PLL is enabled by default and requires no configuration.

How does the LVDS serialization format work for the ADS5277IPFPT?

The ADS5277IPFPT serializes each 10-bit ADC output into a 12-bit LVDS word: the 10 most significant bits contain the conversion result, and the two least significant bits are hardwired to zero. The default serialization order is LSB-first, transmitted on dedicated OUTP/OUTN pairs per channel, synchronized to the LCLKP/LCLKN word clock.

What are the power supply requirements for the ADS5277IPFPT?

The ADS5277IPFPT requires two 3.3V supplies: AVDD (analog, 782mW typical) and LVDD (LVDS output drivers, 218mW typical), both specified from 3.0V to 3.6V. Supply decoupling must include 100nF ceramic capacitors near each AVDD/LVDD pin and bulk capacitance on the board. The total power dissipation is 911mW with internal reference and 845mW with external reference.

Can individual ADC channels be powered down on the ADS5277IPFPT?

Yes, the ADS5277IPFPT supports per-channel power-down via registers 2 and 3. Writing to these registers allows selective shutdown of any combination of the eight channels - for example, setting register 2 to 1010 powers down channels 4 and 2 while keeping 1 and 3 active. Each powered-down channel reduces total power by approximately 110mW.