Texas Instruments ADS7835EB/250G4

Overview

ADS7835EB/250G4 from Texas Instruments (formerly Burr-Brown) is a 12-bit, 500kHz sampling SAR analog-to-digital converter with integrated sample-and-hold, internal 2.5V reference, and synchronous serial interface. It operates from a single +5V supply, delivers ±2.5V bipolar input range, and achieves 72dB SNR at 10kHz - ideal for portable spectrum analyzers and multi-channel data loggers requiring low power and high precision.

For engineers reviewing the ADS7835EB/250G4 datasheet, ADS7835EB/250G4 pinout, ADS7835EB/250G4 application, or ADS7835EB/250G4 equivalent, key selection criteria include guaranteed no missing codes, ±1 LSB integral linearity, MSOP-8 thermal performance over –40°C to +85°C, and compatibility with SPI-like microcontroller interfaces via CONV/CLK/DATA timing control.

Technical Context

The ADS7835EB/250G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling true bipolar input operation without external level-shifting. Its internal 2.5V bandgap reference drives a buffered CDAC, with input impedance switching between ~4kΩ during sampling and ~2kΩ during hold.

Digital interface timing is defined by asynchronous CONV control relative to CLK: conversion start is synchronized to the falling edge of CONV, while serial output (MSB-first by default) aligns to CLK rising edges. Power-down mode activates when CONV remains LOW through the 13th clock cycle, reducing supply current from 3.5mA to 0.5mA.

Key Specifications

Pinout & Package

ADS7835EB/250G4 is housed in an MSOP-8 package (3.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained portable instrumentation and remote sensor nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7835E/250, ADS7835EB/250G4 delivers tighter ±1 LSB linearity for higher-accuracy applications, while AD7892BRZ-1 trades internal reference integration for SPI protocol flexibility - making ADS7835EB/250G4 optimal for compact, low-component-count portable instrumentation.

Availability

ADS7835EB/250G4 is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor networks, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to +85°C.

Supply support for ADS7835EB/250G4 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 full technical documentation and manufacturing continuity for legacy precision analog products.

The ADS7835EB/250G4 belongs to TI's high-speed precision SAR ADC product line, designed specifically for portable and low-power measurement systems demanding 12-bit resolution, sub-1 LSB linearity, and minimal external component count.

FAQ

What is the guaranteed integral linearity specification for ADS7835EB/250G4?

The ADS7835EB/250G4 is specified with ±1 LSB maximum integral linearity error over the full –40°C to +85°C temperature range. This is confirmed in the device's ordering information table and distinguishes it from the ADS7835E grade (±2 LSB). The ±1 LSB value corresponds to ±1.22mV at 2.5V reference, enabling high-fidelity digitization in precision instrumentation where end-point accuracy is critical. ADS7835EB/250G4 maintains this spec across all production lots and temperature extremes.

Does ADS7835EB/250G4 require an external reference voltage?

No, ADS7835EB/250G4 includes a factory-trimmed 2.5V internal bandgap reference that supports its ±2.5V input range without external components. The VREF pin provides buffered access to this reference and can be overdriven by an external 2.3V–2.9V source if improved temperature stability or custom full-scale scaling is needed. Using the internal reference eliminates BOM cost and layout area - a key advantage of ADS7835EB/250G4 in space-constrained portable designs.

How does the power-down mode function in ADS7835EB/250G4?

ADS7835EB/250G4 enters power-down mode when the CONV pin remains LOW through the 13th clock cycle of a conversion sequence, reducing supply current from 3.5mA to 0.5mA. The device exits power-down on the rising edge of CONV and requires tACQ = 350ns to reacquire the input before valid conversion. This feature enables substantial energy savings in intermittent-sampling applications - for example, ADS7835EB/250G4 draws ~1/10 the power at 50kHz vs. 500kHz throughput, extending battery life in remote data loggers.

Can ADS7835EB/250G4 interface directly with SPI-compatible microcontrollers?

Yes, ADS7835EB/250G4 supports SPI-like operation through precise timing control of the CONV and CLK pins. While not a standard 4-wire SPI device, its asynchronous CONV input allows microcontroller GPIO to initiate conversion and manage data framing, with DATA and CLK functioning as MOSI-equivalent and SCK signals. Figure 8 of the ADS7835EB/250G4 datasheet details QSPI-compatible timing, confirming reliable interoperability with STM32, PIC, and MSP430 families without level shifters or protocol converters.

What is the absolute maximum rating for analog input voltage on ADS7835EB/250G4?

The absolute maximum analog input voltage for ADS7835EB/250G4 is –5.3V to +5.3V relative to GND when operating from a +5V supply. Exceeding this range risks permanent damage to the internal 2kΩ–2kΩ input divider network and ESD protection structures. For safe operation within the specified ±2.5V range, designers must ensure signal sources are clamped or buffered - especially important for bipolar inputs crossing ground, as the ADS7835EB/250G4's true bipolar architecture allows sub-ground excursions without external biasing.