Texas Instruments ADS5295PFPR

Overview

ADS5295PFPR from Texas Instruments is a low-power, 12-bit, 100-MSPS, 8-channel analog-to-digital converter with serial LVDS outputs, programmable FIR/IIR digital filtering, and internal reference trimming. It delivers 70.6 dBFS SNR and 85 dBc SFDR at 10 MHz input, consuming 80 mW per channel at full rate. It targets high-density ultrasound imaging front-ends requiring precise multi-channel synchronization and noise suppression near DC.

For engineers reviewing the ADS5295PFPR datasheet, ADS5295PFPR pinout, ADS5295PFPR application, or ADS5295PFPR equivalent, key selection factors include its two-wire LVDS serialization (enabling 100 MSPS with FPGA-compatible data rates), programmable 0–12 dB digital gain, channel averaging mode, low-frequency noise suppression, and QFP-80 thermal performance (θJA = 30.8°C/W).

Technical Context

The ADS5295PFPR integrates eight independent 12-bit SAR-based ADC cores with per-channel sampling control and a shared clock tree to minimize inter-channel skew. Its digital processing block includes a programmable FIR decimation filter for harmonic interference reduction and an IIR high-pass filter to suppress DC offset-both configurable via SPI interface.

It supports dual LVDS output architectures: one-wire (up to 80 MSPS) and two-wire (up to 100 MSPS), with 10× or 12× serialization options. The device uses separate analog (AVDD) and digital (LVDD) 1.8-V supplies, with dedicated AGND/LGND planes and internal reference trimming to ensure ±1.5% gain accuracy across temperature.

Key Specifications

Pinout & Package

ADS5295PFPR is housed in a 12-mm × 12-mm TQFP-80 package (PFP) with exposed thermal pad, rated for –40°C to +85°C operation. Pin layout separates analog inputs (IN1P/IN1N through IN8P/IN8N), LVDS data pairs (OUTxA_P/OUTxA_N and OUTxB_P/OUTxB_N per channel), frame/bit clocks (ADCLKP/ADCLKN, LCLKP/LCLKN), and dedicated supply/ground domains (AVDD/AGND, LVDD/LGND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel ADC applications.

Compared with ADS5295PFPR, ADS5292IPFP trades 2 bits and digital filtering for lower cost and power, while ADS5273IPFP retains 12-bit resolution but sacrifices maximum rate and serialization flexibility-making ADS5295PFPR optimal for full-bandwidth ultrasound and wideband test equipment.

Availability

ADS5295PFPR is available at Aetrix Electronics and suitable for ultrasound imaging systems, communications test equipment, and multichannel data acquisition requiring stable component supply, extended temperature support (–40°C to +85°C), and QFP-80 thermal reliability.

Supply support for ADS5295PFPR 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 ADS5295PFPR belongs to TI's high-channel-count, low-power ADC product line designed specifically for portable and space-constrained medical imaging systems requiring synchronized multi-channel digitization with on-chip signal conditioning.

FAQ

What is the maximum sample rate supported by ADS5295PFPR in two-wire LVDS mode?

The ADS5295PFPR supports a maximum sample rate of 100 MSPS in two-wire LVDS mode, using 12× serialization to maintain manageable per-lane data rates for FPGA receivers. This configuration requires both OUTxB_P/OUTxB_N pairs per channel and LCLKP/LCLKN bit clock outputs. At 100 MSPS, the LVDS bit clock runs at 600 MHz, and the frame clock (ADCLKP/ADCLKN) operates at 100 MHz.

Does ADS5295PFPR include an internal voltage reference?

Yes, the ADS5295PFPR includes an internally trimmed voltage reference with REFT (1.45 V) and REFB (0.45 V) pins, enabling accurate gain matching across all eight channels without external components. The internal reference achieves ±1.5% gain error over temperature. External reference mode is also supported via the same pins for applications requiring tighter absolute accuracy or custom common-mode levels.

How does the low-frequency noise suppression mode improve performance in ADS5295PFPR?

The low-frequency noise suppression mode in ADS5295PFPR improves SNR by approximately 3 dB in the 1-MHz band near DC by modifying internal sampling timing and digital filtering behavior. This enhancement directly benefits Doppler ultrasound and EEG applications where low-frequency signal integrity is critical. The mode is enabled via SPI register write and does not affect full-scale range or latency.

What is the inter-channel aperture delay matching specification for ADS5295PFPR?

The ADS5295PFPR guarantees inter-channel aperture delay matching of ±200 ps across all eight channels under identical temperature and supply conditions. This tight matching is achieved through matched internal clock distribution and sampling circuitry, and it is essential for coherent beamforming in phased-array ultrasound systems where time-of-flight differences must be resolved at sub-nanosecond precision.

Can ADS5295PFPR operate with a 1.7-V analog supply?

Yes, the ADS5295PFPR supports AVDD operation from 1.7 V to 1.9 V per the recommended operating conditions. At 1.7 V, typical SNR remains 70.4 dBFS (vs. 70.6 dBFS at 1.8 V), and power consumption scales linearly-reducing analog supply current to ~206 mA at 100 MSPS. Full functionality, including LVDS output compliance and digital filtering, is maintained across this range.