Texas Instruments ADS7882IPFBR

Overview

ADS7882IPFBR from Texas Instruments is a 12-bit, 3-MSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential unipolar input (0 V to 2.5 V), integrated 2.5-V reference, and high-speed 12-bit parallel interface. It delivers 69.5 dB SNR at 100 kHz input and supports zero-latency back-to-back conversion for real-time data acquisition in optical networking and ultrasound detection systems.

For engineers reviewing the ADS7882IPFBR datasheet, ADS7882IPFBR pinout, ADS7882IPFBR application, or ADS7882IPFBR equivalent, this page provides verified technical context, validated pin functions, confirmed timing-critical interface behavior (CS/CONVST/BUSY), power modes (Nap/Power Down), and real-world ADC selection criteria including SNR, INL, acquisition time, and reference buffer performance.

Technical Context

The ADS7882IPFBR implements a capacitor-based SAR architecture with inherent sample-and-hold, internal conversion clock generation, and charge redistribution logic. Its pseudo-differential input accepts +IN (0–2.5 V) and –IN (±200 mV) to reject common-mode noise and compensate ground offset between sensor and ADC.

It supports three operational modes: full-speed conversion (3 MSPS), Nap mode (3 mA supply current), and Power Down (2.5 µA). The device features dual output formats-12-bit parallel bus (BYTE = 0) or byte-folded 8-bit bus (BYTE = 1)-and uses CMOS-level digital I/O compatible with both 3.3-V and 5-V logic supplies.

Key Specifications

Pinout & Package

The ADS7882IPFBR is housed in a 48-pin TQFP package (PFB designation) with exposed thermal pad, optimized for analog-digital partitioning and low-noise layout. Analog and digital grounds are segregated into dedicated AGND and BDGND pins, and reference pins (REFIN/REFOUT/REFM) require strict decoupling per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7882IPFBR, ADS7883IPFBR offers identical timing and layout compatibility at reduced resolution, while ADS7884IPFBR trades speed and bits for significant power savings - neither is pin-compatible with ADS7882IPFBR's full 12-bit/3-MSPS feature set.

Availability

ADS7882IPFBR is available at Aetrix Electronics and suitable for optical networking, spectrum analysis, ultrasound detection, and high-speed closed-loop control systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for ADS7882IPFBR 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 signal chain solutions, with decades of expertise in precision data converters and industrial-grade reliability.

The ADS7882IPFBR belongs to TI's high-speed SAR ADC family designed for applications demanding low latency, high SNR, and flexible digital interfacing - particularly in test equipment, medical imaging, and telecom infrastructure.

FAQ

What is the maximum sample rate of the ADS7882IPFBR?

The ADS7882IPFBR achieves a maximum throughput rate of 3 MSPS, corresponding to a 333 ns minimum conversion cycle time. This is sustained with full 12-bit resolution and specified performance across the full operating temperature range (–40°C to +85°C), provided timing constraints such as CONVST pulse width (≥63 ns high time) and CS setup/hold are met per the SLAS630 timing diagrams.

Does the ADS7882IPFBR require an external reference?

No, the ADS7882IPFBR includes an internal 2.5-V reference with ±25 mV initial accuracy and 25 ppm/°C drift. When using it, REFOUT must be connected to REFIN through a 0.1-µF bypass capacitor and a 1-µF storage capacitor to AGND (pins 47–48). An external reference may be applied to REFIN if tighter initial accuracy or different voltage is required.

How does the BYTE pin affect data output on the ADS7882IPFBR?

When BYTE = 0, the ADS7882IPFBR outputs the full 12-bit word on DB[11:0]. When BYTE = 1, it folds the lower nibble D[3:0] into the upper byte so D3 appears at DB11 (MSB), enabling direct connection to 8-bit microprocessor data buses without external multiplexing logic - a key feature for legacy controller integration.

What is the power consumption of the ADS7882IPFBR in Nap mode?

In Nap mode (A_PWD held low), the ADS7882IPFBR draws 2–3 mA from the +VA supply, reducing power dissipation from 85 mW (at 3 MSPS) to approximately 10 mW. Acquisition time increases by 60 ns versus normal operation, but conversion timing remains unchanged - ideal for burst-mode acquisition with processor idle periods.

Can the ADS7882IPFBR interface directly with a 3.3-V microcontroller?

Yes, the ADS7882IPFBR supports +VBD = 3.3 V or 5 V for its digital I/O, with VIH(min) = +VBD –1 V and VOL(max) = 0.4 V - fully compatible with standard 3.3-V CMOS logic thresholds. No level-shifting circuitry is needed when interfacing with 3.3-V FPGAs or microcontrollers, provided BDGND and AGND are properly partitioned per TI layout recommendations.