Texas Instruments ADS7822EB/250

Overview

ADS7822EB/250 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with pseudo-differential input, serial CMOS interface, and microPower operation (1.6mW at 200kHz). It features ±1 LSB integral linearity, MSOP-8 package, and operates from 2.7V to 5.25V - designed for precision battery-powered data acquisition.

For engineers reviewing the ADS7822EB/250 datasheet, ADS7822EB/250 pinout, ADS7822EB/250 application, or ADS7822EB/250 equivalent, key selection factors include guaranteed ±1 LSB INL/DNL, 3μA power-down current, 12-bit straight-binary output timing, and compatibility with low-noise remote sensing topologies requiring <60μW average dissipation at 7.5kHz.

Technical Context

The ADS7822EB/250 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6μm CMOS, integrating sample/hold functionality. It uses an external reference (50mV–V_CC) and synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT), with conversion initiated by CS falling edge and data clocked out MSB-first on DCLOCK falling edges.

Its pseudo-differential input (+In/–In) captures voltage difference during hold mode without resampling –– the –In pin is limited to –0.2V to +1.0V and intended for remote ground sensing, not full differential rejection. Power-down is asserted when CS = V_CC, reducing supply current to ≤3μA while disabling analog circuitry and tri-stating DOUT.

Key Specifications

Pinout & Package

ADS7822EB/250 is housed in an MSOP-8 package (DGK marking, A22 date code), 3.0mm × 3.0mm × 1.0mm body, 0.65mm pitch, exposed pad optional. Pinout validated per TI SBAS062C datasheet Figure 1 (top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U/2K5, ADS7822EB/250 delivers 2× better linearity in the same MSOP-8 footprint; versus ADS7822EC/250, it trades 0.25 LSB precision for lower unit cost while retaining full 12-bit monotonicity and microPower behavior.

Availability

ADS7822EB/250 is available at Aetrix Electronics and suitable for battery-operated systems, isolated data acquisition, and remote sensor modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ADS7822EB/250 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 decades of expertise in precision data converters and low-power design.

The ADS7822 product line was engineered for ultra-low-power, high-accuracy data acquisition in space-constrained, energy-harvested, and battery-dependent systems - emphasizing microPower efficiency without sacrificing 12-bit linearity or serial interface simplicity.

FAQ

What is the guaranteed integral linearity error for ADS7822EB/250?

The ADS7822EB/250 is specified with ±1 LSB integral linearity error over –40°C to +85°C, validated per TI SBAS062C datasheet Table 1 (ADS7822B column). This applies to the exact ADS7822EB/250 orderable part in MSOP-8 package with DGK marking and A22 date code, ensuring consistent performance in production systems without post-calibration.

Can ADS7822EB/250 operate from a 2.0V supply?

ADS7822EB/250 supports 2.0V to 2.7V operation per datasheet Note (2), but full 200kHz throughput requires ≥4.75V. At 2.0V, maximum sample rate drops to ~625Hz (10kHz clock), and specifications like INL/DNL and noise are not guaranteed outside the 2.7V–5.25V specified range - use only in non-critical biasing or ultra-low-power sleep modes.

How does the pseudo-differential input of ADS7822EB/250 differ from true differential?

The ADS7822EB/250 pseudo-differential input samples the voltage difference between +In and –In once at hold initiation and holds it - unlike true differential ADCs, –In is not resampled or actively driven. The –In pin is restricted to –0.2V to +1.0V and serves only as a remote ground reference, not for rejecting large common-mode signals.

What is the minimum clock frequency supported by ADS7822EB/250?

ADS7822EB/250 supports clock frequencies down to 10kHz (625Hz throughput), limited by internal capacitor leakage. Below this, acquisition time exceeds specification and linearity degrades. For reliable 7.5kHz sampling, f_CLK must be ≥16× sample rate (120kHz), per datasheet timing diagrams and power-dissipation curves.

Does ADS7822EB/250 require external components for basic operation?

Yes - ADS7822EB/250 requires an external reference (50mV–V_CC), external clock source (10kHz–3.2MHz), and 100nF ceramic bypass capacitor on +VCC. No external op-amp or driver is needed for the pseudo-differential input, but layout best practices (ground plane, guard ring, short traces) are mandatory to achieve ±1 LSB performance.