Texas Instruments ADS7826IDRBR

Overview

ADS7826IDRBR from Texas Instruments is a 10-bit, 200 kSPS SAR analog-to-digital converter with pseudo-differential rail-to-rail input, micropower operation (220 µA quiescent current at full speed), and SPI-compatible 3-wire serial interface. It operates from 2.7 V to 5.25 V supply and supports reference voltages from 50 mV to VCC - ideal for battery-powered sensor front-ends in portable instrumentation.

For engineers reviewing the ADS7826IDRBR datasheet, ADS7826IDRBR pinout, ADS7826IDRBR application, or ADS7826IDRBR equivalent, key selection considerations include its 10-bit resolution with ±1 LSB integral linearity, 8-pin SON package (3 × 3 mm), low-power shutdown mode (3 µA), and compatibility with microcontrollers lacking dedicated ADC peripherals via simple synchronous serial timing.

Technical Context

The ADS7826IDRBR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. It acquires input voltage differentially across +In and –In terminals, then converts using an internal CDAC and comparator - all synchronized by external DCLOCK and controlled by CS/SHDN.

Its serial interface outputs 10-bit straight-binary data MSB-first on DOUT, valid on falling DCLOCK edges, with one null bit preceding conversion data. Conversion time is fixed at 11 DCLOCK cycles, and acquisition requires 1.5 DCLOCK cycles - enabling deterministic timing for real-time control loops.

Key Specifications

Pinout & Package

ADS7826IDRBR uses an 8-pin SON (PDSO) package measuring 3 mm × 3 mm with wettable flanks, compatible with automated optical inspection and reflow soldering. Pin 1 is marked by a dot; top view orientation follows standard JEDEC MO-229.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS7822U and MCP3201-I/P, ADS7826IDRBR uniquely combines 200 kSPS throughput, 3 µA shutdown, and 3 × 3 mm SON packaging - making it the only option among the three viable for compact, long-life, high-sample-rate embedded sensing.

Availability

ADS7826IDRBR is available at Aetrix Electronics and suitable for battery-operated systems, isolated data acquisition modules, and simultaneous multichannel systems requiring stable component supply, guaranteed traceability, and long-term production support.

Supply support for ADS7826IDRBR 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 and embedded processing technologies, with decades of expertise in precision data converters and low-power design.

The ADS7826IDRBR belongs to TI's micropower SAR ADC family, engineered specifically for energy-constrained applications demanding high accuracy without sacrificing speed or integration - including portable instrumentation, remote sensing, and isolated measurement systems.

FAQ

What is the maximum DCLOCK frequency supported by ADS7826IDRBR?

The ADS7826IDRBR supports a maximum DCLOCK frequency of 2.8 MHz at VCC ≥ 2.7 V. This enables its full 200 kSPS throughput, as each conversion requires exactly 14 DCLOCK cycles (11 for conversion + 1.5 for acquisition + 1.5 margin). Operation above 2.8 MHz may cause timing violations and invalid output data.

Does ADS7826IDRBR require an external reference voltage?

Yes, ADS7826IDRBR requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50 mV to VCC, and the reference directly defines the full-scale input range (+IN – –IN). No internal reference is provided; bypassing with a 0.1 µF capacitor is mandatory for stable operation.

Can ADS7826IDRBR interface directly with a 5 V microcontroller SPI port?

Yes, ADS7826IDRBR digital inputs tolerate voltages up to 6 V regardless of VCC, so its CS and DCLOCK pins can accept 5 V logic levels even when powered from 2.7 V or 3.3 V. However, its DOUT output swings 0 V to VCC - if VCC = 3.3 V, a level shifter may be needed for reliable reception by 5 V-tolerant inputs.

What is the meaning of "pseudo-differential" input in ADS7826IDRBR?

"Pseudo-differential" means ADS7826IDRBR measures the voltage difference between +IN and –IN, but –IN is not actively resampled during conversion and has a restricted range (–0.2 V to +1.0 V). It is best used for remote ground sensing rather than true differential signal rejection - unlike fully differential ADCs, it cannot reject large common-mode signals.

How does power consumption scale with sample rate in ADS7826IDRBR?

ADS7826IDRBR power consumption scales linearly with sample rate. At full speed (200 kSPS), quiescent current is 220 µA (590 µW at 2.7 V). At 7.5 kHz, current drops to 20 µA (<60 µW), as the device spends most time in auto power-down between conversions - a key advantage for duty-cycled sensing applications.