Texas Instruments ADS7827IDRBRG4

Overview

ADS7827IDRBRG4 from Texas Instruments is an 8-bit, 250 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 error, 25 pF input capacitance, and operates from 2.7 V to 5.25 V - ideal for battery-powered sensor front-ends requiring low quiescent current and compact footprint.

For engineers reviewing the ADS7827IDRBRG4 datasheet, ADS7827IDRBRG4 pinout, ADS7827IDRBRG4 application, or ADS7827IDRBRG4 equivalent, key selection criteria include its 8-bit resolution at 250 kSPS throughput, 3 × 3 mm SON-8 package, shutdown current ≤3 µA, reference voltage range of 50 mV to V_CC, and compatibility with 3-V/5-V logic systems without level-shifting.

Technical Context

The ADS7827IDRBRG4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. It acquires analog input in 1.5 DCLOCK cycles and completes conversion in 9 DCLOCK cycles, supporting external clock frequencies up to 3 MHz.

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 serial interface outputs straight-binary data MSB-first on DOUT synchronized to the falling edge of DCLOCK, with CS/SHDN controlling both chip select and power-down mode.

Key Specifications

Pinout & Package

ADS7827IDRBRG4 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 8-bit SAR ADC applications.

Compared with ADS7826IDRBR and MCP3002-I/P, ADS7827IDRBRG4 provides the highest throughput (250 kSPS) in the smallest footprint (3 × 3 mm SON), making it optimal for space- and speed-critical battery-powered designs where 8-bit resolution suffices.

Availability

ADS7827IDRBRG4 is available at Aetrix Electronics and suitable for battery-operated sensor nodes, remote data acquisition modules, and isolated analog input channels requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ADS7827IDRBRG4 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 ADS7826/27/29 family was engineered for ultra-low-power, high-speed sampling in portable and distributed measurement systems - emphasizing micropower efficiency, small form factor, and robust performance across wide supply and reference ranges.

FAQ

What is the maximum DCLOCK frequency supported by ADS7827IDRBRG4?

The ADS7827IDRBRG4 supports a maximum DCLOCK frequency of 3 MHz at V_CC ≥ 2.7 V. This enables its full 250 kSPS throughput, as each conversion requires exactly 9 DCLOCK cycles. At lower supply voltages (2.0 V ≤ V_CC < 2.7 V), the maximum clock rate drops below 1.2 MHz per datasheet Section 3.

Does ADS7827IDRBRG4 require an external reference voltage?

Yes, ADS7827IDRBRG4 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50 mV to V_CC, allowing flexibility with internal LDOs, bandgap references, or battery-derived references. No internal reference is provided.

What is the input voltage range for the –IN pin on ADS7827IDRBRG4?

The –IN pin on ADS7827IDRBRG4 has a specified absolute input range of –0.2 V to +1.0 V. Exceeding this range may degrade linearity or cause undefined behavior. It is intended for remote ground sensing or small common-mode rejection - not full differential operation.

Can ADS7827IDRBRG4 interface directly with a 5-V microcontroller?

Yes, ADS7827IDRBRG4 can interface directly with 5-V microcontrollers. Its digital inputs tolerate voltages up to 6 V regardless of V_CC, and its DOUT output swings 0 V to V_CC. If powered at 3.3 V, DOUT remains compatible with 5-V CMOS inputs (though propagation delay may increase slightly).

How does the power-down mode work on ADS7827IDRBRG4?

ADS7827IDRBRG4 enters full power-down mode when CS/SHDN is driven HIGH, reducing supply current to ≤3 µA. In this state, both analog and digital sections are disabled. Conversion resumes on the next falling edge of CS/SHDN, with 1.5 DCLOCK cycles required for input sampling before conversion begins.