Texas Instruments ADS7826IDRBRG4

Overview

ADS7826IDRBRG4 from Texas Instruments is a 10-bit, 200 kSPS 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 - optimized for battery-powered sensor interfaces and isolated data acquisition systems.

For engineers reviewing the ADS7826IDRBRG4 datasheet, ADS7826IDRBRG4 pinout, ADS7826IDRBRG4 application, or ADS7826IDRBRG4 equivalent, key selection considerations include its 10-bit resolution at 200 kSPS, 2.7 V minimum supply, 50 mV–V_CC reference range, and SON-8 package compatibility with space-constrained embedded designs.

Technical Context

The ADS7826IDRBRG4 employs capacitive redistribution SAR architecture with integrated sample/hold, fabricated in 0.6 µm CMOS. Conversion is initiated by CS falling edge, with sampling completed in 1.5 DCLOCK cycles and total conversion time of 11 DCLOCK cycles (14-cycle cycle time).

Its synchronous 3-wire serial interface uses DCLOCK falling edge for DOUT data valid timing, outputs straight-binary 10-bit MSB-first data after one null bit, and enters 3-state on CS rising edge. Input range is pseudo-differential: +In from –0.2 V to V_CC + 0.2 V, –In limited to –0.2 V to 1.0 V.

Key Specifications

Pinout & Package

ADS7826IDRBRG4 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, ADS7826IDRBRG4 uniquely balances 10-bit resolution, 200 kSPS throughput, micropower shutdown, and pseudo-differential input in a 3 × 3 mm SON package - making it optimal for space- and energy-constrained multichannel sensing.

Availability

ADS7826IDRBRG4 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition modules, and isolated industrial data acquisition requiring stable component supply and long-term manufacturability.

Supply support for ADS7826IDRBRG4 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision data converters.

The ADS7826IDRBRG4 belongs to TI's microPOWER™ SAR ADC family, designed specifically for ultra-low-power, high-accuracy signal digitization in portable, isolated, and multichannel measurement systems.

FAQ

What is the maximum DCLOCK frequency supported by ADS7826IDRBRG4 at 3.3 V supply?

The ADS7826IDRBRG4 supports up to 2.8 MHz DCLOCK frequency when V_CC ≥ 2.7 V, including at 3.3 V. This enables its full 200 kSPS throughput with 14 DCLOCK cycles per conversion. Operation above 2.8 MHz risks timing violations and invalid output data - verified in TI SLAS388 specification table under "Timing Specifications".

Does ADS7826IDRBRG4 require an external reference, and what is the minimum usable V_REF?

Yes, ADS7826IDRBRG4 requires an external reference applied to Pin 1 (V_REF). The minimum usable reference voltage is 50 mV - below which linearity degrades and noise contribution increases significantly (e.g., 50 mV yields ~16 LSB peak-to-peak noise). For stable 10-bit performance, TI recommends V_REF ≥ 1.0 V per typical characteristics in Figure 22.

Can ADS7826IDRBRG4 interface directly with a 5 V microcontroller SPI port?

Yes - ADS7826IDRBRG4 digital inputs (CS/SHDN, DCLOCK) tolerate up to 6 V regardless of V_CC, so they accept 5 V logic levels safely. However, DOUT output swings 0 V to V_CC; if V_CC = 3.3 V, the 3.3 V DOUT signal may not meet 5 V CMOS VIH threshold (2.0 V min), requiring a level shifter or pull-up to 5 V with current limiting.

What is the purpose of the –IN pin on ADS7826IDRBRG4, and how should it be connected?

The –IN pin (Pin 3) enables pseudo-differential input mode: the ADC measures the voltage difference (+IN – –IN). It is not re-sampled mid-conversion, so it must be stable during acquisition. TI specifies its range as –0.2 V to 1.0 V - best used for remote ground sensing or biasing to reject small common-mode offsets. Do not tie –IN to V_CC or leave floating.

How does power consumption scale with sample rate in ADS7826IDRBRG4?

ADS7826IDRBRG4 power scales linearly with sample rate due to CMOS switching and analog circuit activity. At full speed (200 kSPS, 2.7 V), quiescent current is 220 µA. At 7.5 kHz, current drops to 20 µA - and further to 3 µA in shutdown (CS HIGH). This enables dynamic power management: the device spends most time in shutdown between conversions, achieving <60 µW average at low rates.