Texas Instruments ADS7835EB/2K5

Overview

ADS7835EB/2K5 from Texas Instruments (formerly Burr-Brown) is a 12-bit, successive approximation register (SAR) analog-to-digital converter with integrated sample-and-hold, internal 2.5V reference, and synchronous serial interface. It delivers 500kHz throughput at 17.5mW, supports ±2.5V bipolar input range, and operates from a single +5V supply - ideal for portable spectrum analyzers and multi-channel battery-powered data loggers.

For engineers reviewing the ADS7835EB/2K5 datasheet, ADS7835EB/2K5 pinout, ADS7835EB/2K5 application, or ADS7835EB/2K5 equivalent, key selection considerations include guaranteed no-missing-codes performance, power-down mode reducing consumption to 2.5mW, MSOP-8 package compatibility, and binary two's complement output format with LSB-first option.

Technical Context

The ADS7835EB/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample-and-hold functionality without external components. Its internal 2.5V bandgap reference drives the CDAC and supports overdrive by external references from 2.3V to 2.9V.

Digital interface timing is decoupled from CONV control: conversion start and hold-mode transition are synchronized to CONV falling edge, independent of CLK; serial data is MSB-first by default but configurable to LSB-first via precise CONV timing during the 13th clock cycle.

Key Specifications

Pinout & Package

ADS7835EB/2K5 is housed in an MSOP-8 package (Package Drawing 337), with dual ground pins (pins 3 and 4) and optimized layout for low-noise analog signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7835E/2K5, ADS7835EB/2K5 provides tighter ±1 LSB integral linearity for metrology-grade measurements; compared with ADS8320EB/250, it trades resolution for 5× higher throughput and +5V single-supply operation - making ADS7835EB/2K5 optimal for battery-powered, high-speed, bipolar-sampling systems.

Availability

ADS7835EB/2K5 is available at Aetrix Electronics and suitable for portable spectrum analyzers, battery-powered data loggers, and wireless communication receivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS7835EB/2K5 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 acquired Burr-Brown in 2000 and maintains its precision analog product lines, including high-performance data converters, op-amps, and voltage references.

The ADS7835EB/2K5 belongs to TI's legacy high-speed SAR ADC family designed for portable, low-power, bipolar-input measurement systems where size, power, and AC performance are jointly constrained.

FAQ

What is the guaranteed integral linearity error for ADS7835EB/2K5 over temperature?

The ADS7835EB/2K5 guarantees ±1 LSB integral linearity error over the full –40°C to +85°C operating range, as specified in the device's ordering information table. This is tighter than the ±2 LSB spec for the ADS7835E variant and directly supports uncalibrated precision measurement in battery-operated field instruments. The ADS7835EB/2K5 achieves this via enhanced trimming during final test.

Can ADS7835EB/2K5 operate with an external reference voltage?

Yes, ADS7835EB/2K5 accepts external reference voltages from 2.3V to 2.9V applied to the VREF pin, overriding the internal 2.5V reference. An internal 10kΩ series resistor isolates the external source from the internal buffer, so dynamic loads must be avoided. The ADS7835EB/2K5 maintains full 12-bit performance with external references, enabling improved temperature stability when paired with low-drift references.

How does the power-down mode function in ADS7835EB/2K5?

ADS7835EB/2K5 enters power-down mode when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle, reducing supply current to 0.5mA (2.5mW). It exits power-down on the rising edge of CONV, requiring ≥tACQ (350ns) to re-establish full power before sampling. This feature enables dramatic average power reduction in intermittent-sampling applications like remote data loggers.

Is ADS7835EB/2K5 compatible with SPI interfaces?

ADS7835EB/2K5 supports SPI-like operation through its asynchronous CONV control and synchronous serial DATA/CLK interface. While not a native SPI device, it can interface directly with microcontrollers using GPIO for CONV and standard SPI hardware for CLK/DATA - with timing verified per Figure 8 in the datasheet. The ADS7835EB/2K5 does not require CS or frame sync signals, simplifying connection to QSPI or generic bit-banged interfaces.

What package type and marking does ADS7835EB/2K5 use?

ADS7835EB/2K5 uses the MSOP-8 package (drawing 337) with exposed pad omitted, and is marked "B35" on the top surface. The "EB" suffix denotes the ±1 LSB integral linearity grade, and "/2K5" indicates tape-and-reel packaging containing 2500 units. This package supports high-density layouts while maintaining thermal and electrical performance required for precision ADCs.