Texas Instruments ADS7826IDRBTG4

Overview

ADS7826IDRBTG4 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. It features ±1 LSB integral linearity, 125 µVrms noise, and ultra-low 250 µA quiescent current at full speed-enabling high-precision signal acquisition in battery-powered sensor interfaces and portable instrumentation.

For engineers reviewing the ADS7826IDRBTG4 datasheet, ADS7826IDRBTG4 pinout, ADS7826IDRBTG4 application, or ADS7826IDRBTG4 equivalent, key selection considerations include its 3 × 3 mm SON-8 package, 2.0–5.25 V supply range, 50 mV–V_CC reference flexibility, and guaranteed 200 kSPS throughput at 2.7 V with <60 µW power dissipation at 7.5 kHz sampling.

Technical Context

The ADS7826IDRBTG4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. Conversion is initiated by CS/SHDN falling edge, with data clocked out MSB-first on DOUT synchronized to DCLOCK falling edges-requiring 14 DCLOCK cycles per conversion (11 for acquisition + 3 for serial output).

Its pseudo-differential input accepts +In and –In signals where –In is fixed (e.g., remote ground sense), enabling common-mode rejection of small offsets. The reference input draws only 0.8 µA at 7.5 kHz and supports external voltages from 50 mV to V_CC, directly scaling LSB size (e.g., 2.44 mV at V_REF = 2.5 V).

Key Specifications

Pinout & Package

ADS7826IDRBTG4 is housed in an 8-pin 3 × 3 mm PDSO (SON) package-same footprint as QFN-with wettable flanks for automated optical inspection. Pin 1 is V_REF; pin 4 is GND; pin 5 is CS/SHDN (active-low chip select / shutdown enable); pin 8 is +V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and ADS7828IPW, ADS7826IDRBTG4 uniquely balances 10-bit precision, 200 kSPS speed, pseudo-differential input, and ultra-low power in a 3 × 3 mm package-making it optimal for compact, battery-sensitive systems requiring mid-range resolution and high sampling fidelity.

Availability

ADS7826IDRBTG4 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition modules, and motor control current sensing applications requiring stable component supply and long-term industrial availability.

Supply support for ADS7826IDRBTG4 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 ADS7826IDRBTG4 belongs to TI's microPOWER™ SAR ADC family, engineered for ultra-low-power, high-accuracy signal acquisition in portable and energy-constrained systems-emphasizing minimal supply current, wide voltage operation, and small-footprint packaging.

FAQ

What is the maximum DCLOCK frequency supported by ADS7826IDRBTG4?

The ADS7826IDRBTG4 supports a maximum DCLOCK frequency of 2.8 MHz at V_CC ≥ 2.7 V. This enables its full 200 kSPS throughput, as each conversion requires 14 DCLOCK cycles. At lower supply voltages (2.0–2.7 V), the maximum clock rate decreases to maintain timing margins, and throughput is reduced to 85 kSPS.

Does ADS7826IDRBTG4 require an external reference voltage?

Yes, ADS7826IDRBTG4 requires an external reference voltage applied to pin 1 (V_REF). It accepts any stable voltage from 50 mV to V_CC, allowing flexible scaling of input range. No internal reference is provided; omitting the external reference will result in undefined conversion results.

How does the pseudo-differential input of ADS7826IDRBTG4 differ from true differential input?

The ADS7826IDRBTG4 uses a pseudo-differential input: +IN and −IN are sampled simultaneously, but −IN is not re-sampled later in the conversion cycle. Its voltage range is limited to −0.2 V to +1.0 V, making it suitable for remote ground sensing-not for rejecting large common-mode signals like a true differential ADC.

Can ADS7826IDRBTG4 operate from a 2.0 V supply?

Yes, ADS7826IDRBTG4 operates from 2.0 V to 5.25 V. At 2.0 V, its maximum throughput drops to 85 kSPS and recommended reference voltage narrows to 1.024–1.25 V. Full 200 kSPS performance is only guaranteed at V_CC ≥ 2.7 V per datasheet specifications.

What is the purpose of the CS/SHDN pin on ADS7826IDRBTG4?

The CS/SHDN pin on ADS7826IDRBTG4 serves dual functions: when driven LOW, it initiates conversion and enables serial data output on DOUT; when driven HIGH, it places the device in full power-down mode, reducing supply current to ≤3 µA. No separate shutdown command is needed-the state is hardware-controlled.