Texas Instruments ADS7862Y/250

Overview

ADS7862Y/250 from Texas Instruments is a dual 12-bit, 500kHz simultaneous-sampling SAR analog-to-digital converter with four fully differential input channels (A0/A1/B0/B1), 2µs per-channel throughput, guaranteed no missing codes, and parallel CMOS interface - deployed in real-time motor control and 3-phase power monitoring systems.

For engineers reviewing the ADS7862Y/250 datasheet, ADS7862Y/250 pinout, ADS7862Y/250 application, or ADS7862Y/250 equivalent, key selection considerations include simultaneous dual-channel acquisition timing, ±2 LSB integral linearity at –40°C to +85°C, internal 2.5V reference with 80dB CMRR at 50kHz, and TQFP-32 package compatibility with high-noise industrial signal chains.

Technical Context

The ADS7862Y/250 implements two independent successive approximation register (SAR) ADC cores with synchronized sample-and-hold amplifiers, enabling true simultaneous sampling across Channel A (A0/A1) and Channel B (B0/B1). Each channel pair shares a dedicated S/H amplifier and SAR engine, with aperture jitter of 50ps and matching <100ps between channels.

It uses an external 8MHz CMOS clock (CLOCK pin) to achieve 500kHz per-channel sampling rate via 16-clock-cycle conversion cycle. The parallel 12-bit output bus (DB0–DB11) operates with RD/CS-controlled register selection for A/B channel data reads, supporting interleaved read-conversion sequences without bus contention.

Key Specifications

Pinout & Package

TQFP-32 package (PBS designation), 7mm × 7mm body, 0.5mm pitch, exposed thermal pad - compatible with standard reflow profiles and automated optical inspection (AOI) in high-volume manufacturing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with ADS7862Y/250, ADS8327IPW trades simultaneous sampling for higher resolution and smaller footprint but cannot replace it in phase-critical motor control; AD7656ASTZ offers more channels and bits but at reduced speed and increased board area - ADS7862Y/250 remains optimal for cost-sensitive, space-constrained 4-channel 12-bit simultaneous acquisition.

Availability

ADS7862Y/250 is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, and 3-phase power control requiring stable component supply across extended industrial temperature ranges.

Supply support for ADS7862Y/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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.

The ADS7862Y/250 belongs to TI's high-speed precision SAR ADC product line, designed specifically for real-time industrial control applications demanding simultaneous multi-channel acquisition, low latency, and robust noise immunity.

FAQ

What is the maximum sampling rate supported by the ADS7862Y/250?

The ADS7862Y/250 achieves a maximum per-channel sampling rate of 500kHz when driven by an 8MHz external clock, resulting in 2µs total throughput per channel. This rate is fixed by the internal 16-clock-cycle conversion architecture and cannot be exceeded without violating timing specifications.

Does the ADS7862Y/250 require an external reference voltage?

No - the ADS7862Y/250 includes an internal 2.5V reference with ±0.5% initial accuracy and ±25ppm/°C drift. Pin 2 (REFOUT) must be directly connected to pin 1 (REFIN) to enable it. An external reference (1.2V–2.6V) may be used only if custom full-scale range is needed.

How does the ADS7862Y/250 handle simultaneous sampling across four channels?

The ADS7862Y/250 uses two independent sample-and-hold amplifiers - one for Channel A (A0/A1) and one for Channel B (B0/B1). When CONVST goes LOW, both S/Hs enter hold mode simultaneously, capturing input voltages at identical instants with <100ps aperture delay matching.

What is the purpose of the A0 pin on the ADS7862Y/250?

The A0 pin selects which differential pair is converted: LOW selects CH A0/CH B0; HIGH selects CH A1/CH B1. During read operations, A0 also determines whether the first RD pulse fetches A0/B0 or A1/B1 data - enabling flexible channel grouping without hardware reconfiguration.

Can the ADS7862Y/250 operate from a single 3.3V supply?

No - the ADS7862Y/250 requires separate +VA and +VD supplies at +5V ±5% (4.75V–5.25V). Its CMOS interface, internal reference, and SAR core are specified only for 5V operation; 3.3V supply will result in undefined behavior and failure to meet AC/DC specifications.