Texas Instruments ADS822E

Overview

ADS822E from Texas Instruments is a 10-bit, 40MSPS pipelined analog-to-digital converter (ADC) designed for high-fidelity signal acquisition in demanding imaging and instrumentation systems. It operates from a single +5V supply, delivers 60dB SNR and 72dBFS SFDR at 1MHz input, supports both single-ended and fully differential analog inputs, and features internal/external reference selection - enabling precise gain/offset matching in multichannel medical imaging and test equipment.

For engineers reviewing the ADS822E datasheet, ADS822E pinout, ADS822E application, or ADS822E equivalent, key selection criteria include its 40MHz sampling rate, SSOP-28 package compatibility, 0.5LSB DNL performance, 5-clock-cycle latency, and dual-reference flexibility for system-level calibration and channel synchronization.

Technical Context

The ADS822E employs a 9-stage pipelined CMOS architecture with digital error correction logic to guarantee no missing codes and ±1.0LSB integral nonlinearity across –40°C to +85°C. Its track-and-hold supports 300MHz –3dB bandwidth and accepts either single-ended (1.5–3.5V range) or differential (2V_p-p) inputs, with programmable full-scale via RSEL pin.

Timing is synchronized to the rising edge of the convert clock; aperture jitter is specified at 1.2ps_rms, and data valid after 5 clock cycles. Reference operation is configurable via INT/EXT pin: internal 3.5V/1.5V references (±25mV tolerance) or external top/bottom references (REFB: 1.25–1.5V; REFT: 3.5–(+V_S−1.25V)) enable multichannel gain matching.

Key Specifications

Pinout & Package

ADS822E is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, JEDEC MO-153 compliant, thermal resistance θ_JA = 89°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS823E and ADS828E, the ADS822E offers the lowest power consumption (190mW) at its rated 40MSPS while maintaining identical pinout, reference flexibility, and 0.5LSB DNL - making it the optimal choice for thermally constrained, cost-sensitive imaging and instrumentation designs.

Availability

ADS822E is available at Aetrix Electronics and suitable for medical imaging systems, automated test equipment, and high-resolution computer scanners requiring stable component supply, long-term production continuity, and traceable sourcing.

Supply support for ADS822E 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 high-speed signal chain solutions.

The ADS822E belongs to TI's high-performance pipeline ADC product line, engineered specifically for applications demanding high SNR, low distortion, and flexible reference architecture in medical, test, and video systems.

FAQ

What is the maximum sampling rate supported by the ADS822E?

The ADS822E supports a maximum sampling rate of 40MSPS, as confirmed in the Electrical Characteristics table and Timing Diagram section of the SBAS069B datasheet. This rate is validated across the full –40°C to +85°C temperature range with external reference and V_DRV = 3V. Exceeding 40MSPS is not guaranteed and may degrade SFDR or introduce missing codes.

Does the ADS822E support differential analog input operation?

Yes, the ADS822E supports fully differential analog input operation using pins 24 (IN) and 25 (IN), as explicitly stated in the FEATURES list and APPLICATION INFORMATION section. Differential mode improves SFDR by up to 3dB compared to single-ended operation at 10MHz input, and requires external common-mode biasing or transformer coupling per Figure 5.

What reference options are available for the ADS822E?

The ADS822E offers internal and external reference options. Internal reference provides fixed 3.5V (REFT) and 1.5V (REFB) outputs with ±25mV tolerance. External reference mode (enabled by pulling INT/EXT pin high) accepts user-supplied REFT (1.5V to +V_S−1.25V) and REFB (1.25V to REFT−0.8V), enabling multichannel gain matching and full-scale adjustment.

How does the power-down feature of the ADS822E function?

The ADS822E power-down feature is controlled by the PD pin (pin 13): driving PD high enables normal operation (190mW), while driving PD low reduces power dissipation to 20mW. This state retains register configuration and reference settings, allowing fast wake-up (<1µs) without reinitialization - ideal for burst-mode acquisition in portable test gear.

Is the ADS822E pin-compatible with other devices in the ADS82x family?

Yes, the ADS822E is pin-for-pin compatible with the ADS823E (60MSPS) and ADS828E (75MSPS) in the SSOP-28 package, as confirmed in the DESCRIPTION section ("pin-for-pin compatible with... ADS823 and ADS826, and... ADS828"). This allows direct upgrade paths without PCB redesign when higher sampling rates are later required.