Texas Instruments ADS831E

Overview

ADS831E from Texas Instruments is an 8-bit, 80MHz pipelined analog-to-digital converter (ADC) with single-ended or differential input capability, internal/external reference selection, and SSOP-20 packaging. It delivers 49dB SNR at 1MHz, ±0.35LSB DNL, and operates from a single +5V supply - optimized for high-speed imaging and video digitizing systems requiring precise timing and low distortion.

For engineers reviewing the ADS831E datasheet, ADS831E pinout, ADS831E application, or ADS831E equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to ADS831E - not generic ADCs or family-level abstractions.

Technical Context

The ADS831E employs a 6-stage pipelined CMOS architecture with digital error correction logic to guarantee no missing codes and ±0.35LSB differential nonlinearity at 10MHz input. Its track-and-hold supports both single-ended (1.5V–3.5V range) and differential (2V_p-p) modes, with common-mode bias derived from internal REFT/REFB or external references.

Timing is synchronized to the rising edge of CLK, with fixed 4-clock-cycle data latency and aperture jitter of 1.2ps_rms. The VDRV pin enables independent logic-level control (3V or 5V), while RSEL and INT/EXT pins configure input range (1V_p-p/2V_p-p) and reference source without external components.

Key Specifications

Pinout & Package

ADS831E is housed in a 20-pin SSOP (DBQ) package with 0.65mm pitch, RoHS-compliant NIPDAU finish, and MSL Level-2-260°C-1 year rating. Thermal resistance θ_JA is 115°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 8-bit ADC applications.

Compared with ADS831E, ADS830E offers pin-compatible downspeeding for cost reduction in non-critical bandwidth applications, while MAX1186EEE+ trades parallel CMOS simplicity for LVDS noise immunity - neither is drop-in replaceable without verifying timing margins, reference configuration, and digital interface compatibility.

Availability

ADS831E is available at Aetrix Electronics and suitable for medical imaging systems, video digitizing hardware, computer scanners, disk-drive control circuits, and communications receivers requiring stable component supply across extended production lifecycles.

Supply support for ADS831E 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 over 50 years of innovation in precision data converters and signal chain solutions.

The ADS831E belongs to TI's high-speed pipeline ADC product line, designed specifically for demanding imaging, video, and instrumentation applications where speed, linearity, and low power coexist under single-supply constraints.

FAQ

What is the maximum sampling rate supported by the ADS831E?

The ADS831E supports a maximum sampling rate of 80 million samples per second (80MSPS), validated across its full operating temperature range (–40°C to +85°C). This rate is achievable with proper clock conditioning - including <2ns rise/fall times and <1.2ps_rms jitter - and is specified with external reference, 2V_p-p input range, and VDRV = 3V. Exceeding 80MSPS degrades SNR and introduces missing codes.

Does the ADS831E require external reference components to operate?

No, the ADS831E does not require external reference components to operate. It integrates a precision bandgap-based internal reference generating +3.0V (REFT) and +2.0V (REFB) outputs, enabling immediate operation with 2V_p-p full-scale range. External references are optional and used only when tighter DC accuracy, better temperature drift, or multi-channel gain matching is required - the INT/EXT pin selects between internal and external modes.

How does the RSEL pin affect the ADS831E's input voltage range?

The RSEL pin on the ADS831E configures the analog input full-scale range: logic HIGH selects 2V_p-p (1.5V to 3.5V), while logic LOW selects 1V_p-p (2.0V to 3.0V). An internal 50kΩ pull-up resistor sets RSEL HIGH by default, making 2V_p-p the operational mode when the pin is left unconnected. This eliminates external resistors for standard configurations while allowing flexible scaling for varying sensor output amplitudes.

Can the ADS831E interface directly with 3V logic systems?

Yes, the ADS831E can interface directly with 3V logic systems using its dedicated VDRV pin. When VDRV is supplied with +3V, the digital outputs (D0–D7) produce valid 3V CMOS logic levels with VOL ≤ +0.1V and VOH ≥ +2.8V at 50µA load - fully compatible with 3V FPGAs, microcontrollers, and ASICs. This also reduces power dissipation by 15mW compared to 5V VDRV operation.

What is the purpose of the CM pin on the ADS831E?

The CM pin on the ADS831E provides a buffered +2.5V common-mode voltage output derived from the internal REFT/REFB divider, intended to bias external driving amplifiers. It delivers up to 1mA and maintains stability under light loading, but must not be heavily loaded due to its high-impedance nature. In DC-coupled designs, CM simplifies level-shifting; in AC-coupled setups, it replaces external resistor dividers - directly supporting op amps like OPA681 that require mid-supply bias.