Texas Instruments ADS7816EB/250

Overview

ADS7816EB/250 from Burr-Brown (now Texas Instruments) is a 12-bit, 200kHz sampling SAR analog-to-digital converter with differential input, synchronous serial interface, and programmable reference voltage (100mV–5V). It delivers 1.9mW power at full rate, 3µA shutdown current, and ±2 LSB integral linearity in MSOP-8 package - ideal for low-power remote data acquisition systems requiring high resolution and isolation.

For engineers reviewing the ADS7816EB/250 datasheet, ADS7816EB/250 pinout, ADS7816EB/250 application, or ADS7816EB/250 equivalent, key selection considerations include its micro-power operation at variable sample rates (12.5kHz–200kHz), differential input rejection capability, reference-voltage-dependent LSB sizing (24µV–1.22mV), and compatibility with CMOS-level serial host controllers.

Technical Context

The ADS7816EB/250 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external clock (10kHz–3.2MHz), external reference (100mV–5V), and single +5V supply - with conversion time fixed at 12 clock cycles and acquisition time of 1.5 clock cycles.

Its digital interface uses a 3-wire synchronous serial protocol: CS/SHDN initiates conversion and controls shutdown, DCLOCK synchronizes bit transfer on falling edge, and DOUT outputs 12-bit straight-binary data MSB-first after one null bit - with no pipeline delay and tri-state capability upon CS high.

Key Specifications

Pinout & Package

The ADS7816EB/250 is housed in an 8-lead MSOP package (Package Drawing 337), measuring 3.0mm × 3.0mm × 1.0mm, with exposed thermal pad for enhanced thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816U and ADS7822U, the ADS7816EB/250 uniquely combines MSOP-8 compactness, differential input capability, and externally programmable reference - making it optimal for space-constrained, isolated, or multi-range sensor systems where layout efficiency and flexibility are prioritized.

Availability

ADS7816EB/250 is available at Aetrix Electronics and suitable for battery-operated instrumentation, remote sensor networks, and isolated industrial data acquisition requiring stable component supply across extended product lifecycles.

Supply support for ADS7816EB/250 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

Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in precision analog ICs including data converters, op amps, and interface solutions.

The ADS7816EB/250 belongs to Burr-Brown's high-speed micro-power SAR ADC family, designed specifically for portable and distributed measurement systems demanding resolution, low power, and small form factor.

FAQ

What is the maximum sampling rate supported by the ADS7816EB/250?

The ADS7816EB/250 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK signal (16× oversampling). At this rate, conversion time is fixed at 12 clock cycles and acquisition time is 1.5 clock cycles. Lower sample rates (e.g., 12.5kHz) reduce power consumption to 150µW while maintaining full 12-bit resolution and linearity.

Does the ADS7816EB/250 include an internal voltage reference?

No, the ADS7816EB/250 requires an external reference voltage applied to the VREF pin. It accepts 100mV to 5V, enabling flexible full-scale range configuration. The reference current varies with sample rate and output code (2.4–100µA), so the external reference source must drive this dynamic load without significant droop or noise.

How does the differential input of the ADS7816EB/250 function in practice?

The ADS7816EB/250 samples the voltage difference between +In and –In simultaneously - the –In pin is not resampled later in the conversion cycle. Because –In is limited to GND ±200mV, it functions primarily as a remote ground sense point rather than a true differential signal input. This configuration rejects small ground-potential differences in isolated or long-cable applications.

What package type is used for the ADS7816EB/250, and what are its key mechanical features?

The ADS7816EB/250 uses an 8-lead MSOP package (Package Drawing 337), measuring 3.0mm × 3.0mm × 1.0mm with gull-wing leads. It includes an exposed thermal pad for improved heat dissipation - critical for maintaining accuracy in compact, sealed enclosures or high-density PCB layouts.

Can the ADS7816EB/250 be used with microcontrollers lacking native SPI hardware?

Yes, the ADS7816EB/250's 3-wire synchronous serial interface (CS/SHDN, DCLOCK, DOUT) is software-bitbangable. Its timing requirements - including 15ns minimum setup/hold times and 150ns minimum clock pulse width - are compatible with most 8–32-bit MCUs running at ≥10MHz. The absence of a data-in line simplifies GPIO-only implementation.