Texas Instruments ADS828E

Overview

ADS828E from Texas Instruments is a 10-bit, 75MHz pipelined analog-to-digital converter (ADC) operating from a single +5V supply. It delivers 58dB SNR, ±0.4LSB DNL, and supports both single-ended and differential analog inputs with programmable 1V_p-p/2V_p-p ranges-used in HDTV digitizing, medical imaging, and high-speed test equipment.

For engineers reviewing the ADS828E datasheet, ADS828E pinout, ADS828E application, or ADS828E equivalent, this page provides verified technical context, SSOP-28 package mapping, real-world timing behavior (5-cycle latency), reference configuration options (internal/external), and validated alternative ADCs for multi-channel or low-jitter sampling systems.

Technical Context

The ADS828E implements a 9-stage pipelined CMOS architecture with digital error correction logic to guarantee no missing codes and ±0.4LSB DNL at 75MSPS. Its track-and-hold supports both single-ended input (1.5V–3.5V range) and differential input (2V_p-p), with aperture jitter of 1.2ps_rms and 5-clock-cycle data latency.

It features dual reference control: internal 3.5V/1.5V reference pair (±25mV tolerance) or external reference selection via INT/EXT pin, enabling gain/offset matching across multi-ADC systems. Output drivers are isolated via VDRV pin (3V or 5V selectable), supporting TTL/+3V/+5V CMOS logic compatibility with 3-state outputs enabled by OE pin.

Key Specifications

Pinout & Package

ADS828E is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, θ_JA = 89°C/W. Ground pins (1, 16, 26) must connect directly to analog ground plane; +VS pins (15, 27) require local 0.1µF + 2.2µF bypassing per TI SBAS126A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS828E, ADS823E trades 15MSPS and 3dB SFDR for lower power and identical footprint, while AD9215BRUZ-80 offers higher speed/SNR at the cost of supply complexity and non-drop-in replacement.

Availability

ADS828E is available at Aetrix Electronics and suitable for HDTV digitizing, medical ultrasound imaging, and high-speed automated test equipment requiring stable component supply across long production lifecycles.

Supply support for ADS828E 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 high-performance data converters for industrial, automotive, and communications markets.

The ADS828E belongs to TI's high-speed pipeline ADC product line, designed specifically for demanding digitizing applications requiring >55dB SNR, sub-1ps aperture jitter, and flexible reference/input configurations in compact packages.

FAQ

What is the maximum sampling rate supported by the ADS828E?

The ADS828E is specified for continuous operation at up to 75 million samples per second (75MSPS). This maximum rate is guaranteed across the full temperature range (–40°C to +85°C) with proper clock jitter control (<1.2ps_rms) and adequate power supply decoupling. At this rate, the ADS828E maintains its rated 58dB SNR and ±0.4LSB DNL performance when using the recommended 2V_p-p input range and internal reference. Exceeding 75MSPS may result in increased missing codes or degraded SFDR.

Does the ADS828E support differential analog input?

Yes, the ADS828E supports true differential analog input via pins 24 (IN) and 25 (IN), with a specified 2V_p-p full-scale range. In differential mode, it achieves superior spurious-free dynamic range (70dBFS at 1MHz) compared to single-ended operation (64.6dBFS), due to common-mode noise rejection and balanced track-and-hold architecture. The device requires external biasing of both inputs to the common-mode voltage (CM pin output or external divider), and the INT/EXT and RSEL pins must be configured appropriately for optimal performance.

How does the power-down mode affect ADS828E functionality?

When the PD pin is driven high, the ADS828E enters power-down mode, reducing total power dissipation to 20mW while maintaining register states and reference settings. In this state, the analog core, reference buffers, and track-and-hold are disabled, but the digital interface remains responsive-OE and CLK pins retain their functions, allowing rapid wake-up (<100ns) upon PD deactivation. This mode is ideal for burst-mode acquisition in portable medical devices or test instruments where duty cycling improves thermal management without sacrificing startup latency.

Can the ADS828E operate with a 3V digital I/O supply?

Yes, the ADS828E supports +3V logic I/O through its dedicated VDRV pin (pin 28). When VDRV = 3V, the digital outputs produce compatible TTL/+3V CMOS levels (VOH ≈ 2.8V, VOL ≈ 0.1V), reducing switching noise and power consumption by ~15mW versus 5V operation. The device's digital inputs (CLK, OE, PD, RSEL, INT/EXT) also accept 3V logic thresholds, making the ADS828E fully interoperable with 3V FPGAs and microcontrollers without level shifters-provided the analog +VS supply remains at +5V.

What is the purpose of the CM pin on the ADS828E?

The CM pin (pin 23) provides an unbuffered, high-impedance common-mode voltage output nominally at +2.5V-derived from the internal reference ladder midpoint. It serves as a precision bias point for external driving amplifiers in single-ended configurations, eliminating the need for external resistive dividers. However, because it is not buffered, loading the CM pin with >10µA will cause significant voltage droop and degrade ADC accuracy; TI recommends using it only to drive high-Z inputs (e.g., op-amp non-inverting terminals) or buffering it with a unity-gain follower if driving capacitive or resistive loads.