Texas Instruments ADS7826IDRBT

Overview

ADS7826IDRBT from Texas Instruments is a 10-bit, 200 kSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential rail-to-rail input, SPI-compatible serial interface, and micropower operation at 2.7 V supply. It features ±1 LSB integral linearity, 25 pF input capacitance, and operates from 2.0 V to 5.25 V - ideal for battery-powered sensor signal conditioning in portable instrumentation.

For engineers reviewing the ADS7826IDRBT datasheet, ADS7826IDRBT pinout, ADS7826IDRBT application, or ADS7826IDRBT equivalent, key selection considerations include its 10-bit resolution at 200 kSPS, 3 × 3 mm SON-8 package, 2.7 V minimum supply, 50 mV–V_CC reference range, and guaranteed performance over –40°C to +85°C.

Technical Context

The ADS7826IDRBT implements capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. It acquires and converts analog signals in 11 DCLOCK cycles, requiring only an external reference and synchronous serial clock - no internal oscillator or reference required.

Its pseudo-differential input accepts +In and –In signals with –In limited to –0.2 V to +1.0 V, enabling remote ground sensing. The SPI-compatible 3-wire interface outputs straight-binary data MSB-first on DOUT synchronized to DCLOCK falling edges, with CS/SHDN controlling conversion start and power-down mode.

Key Specifications

Pinout & Package

ADS7826IDRBT is housed in an 8-pin 3 × 3 mm PDSO (SON) package - same footprint as QFN - with wettable flanks for automated optical inspection. Thermal pad is not electrically connected.

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, ADS7826IDRBT delivers 60% higher throughput in half the footprint with guaranteed –40°C to +85°C performance and integrated shutdown - making it optimal for next-generation compact, battery-efficient data acquisition.

Availability

ADS7826IDRBT is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition modules, and isolated industrial monitoring requiring stable component supply and long-term manufacturability.

Supply support for ADS7826IDRBT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The ADS7826IDRBT belongs to TI's micropower SAR ADC family designed specifically for ultra-low-power, space-constrained signal acquisition - emphasizing guaranteed specifications at 2.7 V, minimal external components, and compatibility with energy-harvesting and battery-only systems.

FAQ

What is the maximum DCLOCK frequency supported by ADS7826IDRBT?

The ADS7826IDRBT supports a maximum DCLOCK frequency of 2.8 MHz at V_CC ≥ 2.7 V. This enables full 200 kSPS throughput with a 14-cycle frame (1 null bit + 10 data bits). At lower supply voltages (2.0 V ≤ V_CC < 2.7 V), the maximum clock rate drops below 1.2 MHz per datasheet SLAS388 Section 3.

Does ADS7826IDRBT require an external reference voltage?

Yes, ADS7826IDRBT requires an external reference voltage applied to the V_REF pin. It accepts any stable voltage from 50 mV to V_CC, allowing use of precision references (e.g., REF3025) or simple resistor dividers. The reference directly sets the full-scale input range and LSB size (V_REF/1024).

How does the pseudo-differential input of ADS7826IDRBT function in practice?

The pseudo-differential input uses +IN and –IN pins: +IN accepts rail-to-rail signals, while –IN is restricted to –0.2 V to +1.0 V. In practice, –IN is typically tied to remote ground or sensor common to reject small common-mode shifts. The ADC digitizes the voltage difference (+IN – –IN), but –IN is not resampled mid-conversion - unlike true differential SARs.

What is the power consumption of ADS7826IDRBT at 200 kSPS?

At 200 kSPS and V_CC = 2.7 V, ADS7826IDRBT draws 250–350 µA quiescent current, resulting in ~675–945 µW total power. At reduced sample rates (e.g., 7.5 kHz), average current drops to 20 µA (< 54 µW), as the device spends most time in auto power-down between conversions.

Is ADS7826IDRBT pin-compatible with other members of the ADS782x family?

Yes, ADS7826IDRBT shares identical pinout, package (SON-8), and serial interface timing with ADS7827IDRBT and ADS7829IDRBT. However, resolution (10-bit), throughput (200 kSPS), and linearity (±1 LSB INL) are specific to ADS7826IDRBT - substituting other variants requires firmware and accuracy validation.