Texas Instruments ADS7816UB/2K5G4

Overview

ADS7816UB/2K5G4 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 range (100mV–5V). It delivers 1.9mW power at full rate, 3µA shutdown current, and ±2 LSB integral linearity - optimized for remote, isolated, or battery-powered data acquisition systems.

For engineers reviewing the ADS7816UB/2K5G4 datasheet, ADS7816UB/2K5G4 pinout, ADS7816UB/2K5G4 application, or ADS7816UB/2K5G4 equivalent, key selection considerations include its micro-power operation at variable sample rates (12.5kHz–200kHz), differential input architecture rejecting common-mode noise up to ±200mV on –In, and SOIC-8 package compatibility with space-constrained PCB layouts.

Technical Context

The ADS7816UB/2K5G4 implements a capacitive redistribution successive approximation register (SAR) architecture fabricated in 0.6µm CMOS, enabling single-supply +5V operation with no internal reference. Conversion is initiated by CS/SHDN falling edge, followed by 1.5 clock cycles of sampling and 12 clock cycles of conversion, with serial output (MSB-first) enabled on the second falling edge of DCLOCK.

Its differential analog input (+In/–In) captures voltage difference directly onto an internal capacitor array during hold mode; –In is limited to ±200mV relative to GND and serves primarily as remote ground sense. Reference current scales with sample rate and code value (e.g., 38–100µA at 200kHz), while power-down is fully activated only when CS = VCC - reducing supply current to 3µA max and disabling both analog and digital sections.

Key Specifications

Pinout & Package

ADS7816UB/2K5G4 is housed in an 8-lead SOIC package (JEDEC MS-012AC, body width 3.9mm), pin-compatible with ADS7816P (PDIP) and ADS7816E (MSOP) variants. Thermal pad not present; standard SOIC reflow profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816UC/2K5, ADS7816UB/2K5 trades 1 LSB linearity for broader availability and lower unit cost; versus ADS8320EB/250, it delivers 2× sampling rate and simpler timing at the expense of resolution - making ADS7816UB/2K5 the preferred choice for cost-sensitive, medium-speed industrial DAQ.

Availability

ADS7816UB/2K5G4 is available at Aetrix Electronics and suitable for remote sensor monitoring, isolated industrial data acquisition, battery-powered data loggers, and portable medical instrumentation requiring stable component supply across extended product lifecycles.

Supply support for ADS7816UB/2K5G4 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 products for industrial and instrumentation markets.

The ADS7816UB/2K5G4 belongs to Burr-Brown's micro-power SAR ADC family designed specifically for low-power, high-accuracy data acquisition in battery-operated and electrically noisy environments - emphasizing simplicity, reliability, and ease of layout.

FAQ

What is the maximum sampling rate supported by the ADS7816UB/2K5G4?

The ADS7816UB/2K5G4 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK frequency (16× oversampling ratio). At this rate, total conversion time is 13.5 clock cycles (1.5 for sampling + 12 for conversion), yielding a minimum inter-conversion interval of 5µs. Lower rates down to 12.5kHz are fully supported with proportional reduction in power consumption.

Does the ADS7816UB/2K5G4 require an external reference voltage?

Yes, the ADS7816UB/2K5G4 requires an external reference voltage applied to the VREF pin. It operates with references from 100mV to 5V, directly setting the full-scale input range. The device draws reference current that varies with sample rate and output code (e.g., 38–100µA at 200kHz), so the reference source must be low-impedance and well-bypassed with a 0.1µF ceramic capacitor.

What is the purpose of the –In pin on the ADS7816UB/2K5G4?

The –In pin on the ADS7816UB/2K5G4 serves as the inverting input for differential measurement and is intended primarily for remote ground sensing - not general-purpose common-mode rejection. Its voltage range is strictly limited to GND ±200mV; exceeding this violates linearity specifications. In practice, –In connects to the signal source's local ground to cancel potential differences across long cables.

How does power-down mode work on the ADS7816UB/2K5G4?

Power-down on the ADS7816UB/2K5G4 is activated when CS/SHDN is driven HIGH, reducing supply current to ≤3µA and disabling both analog and digital circuitry. When CS is LOW but no conversion is active, only the analog section powers down - digital logic remains active, drawing ~30µA at 12.5kHz. Full shutdown requires explicit CS = VCC assertion, enabling ultra-low standby power in battery systems.

Is the ADS7816UB/2K5G4 pin-compatible with other ADS7816 variants?

Yes, the ADS7816UB/2K5G4 in SOIC-8 is pin-compatible with all ADS7816 variants (e.g., ADS7816P in PDIP, ADS7816E in MSOP), sharing identical pin functions and electrical behavior. Differences lie only in grade (UB vs UC vs PB), package, and ordering suffix - allowing direct substitution in existing SOIC footprints without layout changes, provided thermal and mechanical constraints are met.