Texas Instruments ADC161S626CIMMX/NOPB

Overview

ADC161S626CIMMX/NOPB from Texas Instruments is a 16-bit successive approximation register (SAR) analog-to-digital converter with differential input, 50–250 kSPS sampling rate, ±0.003% signal span accuracy, and independent VIO (2.7–5.5 V) and VA (4.5–5.5 V) supplies. It interfaces directly with bridge sensors in battery-powered data acquisition systems.

For engineers reviewing the ADC161S626CIMMX/NOPB datasheet, ADC161S626CIMMX/NOPB pinout, ADC161S626CIMMX/NOPB application, or ADC161S626CIMMX/NOPB equivalent, key selection considerations include its zero-power track mode, 93.2 dBc SNR at 250 kSPS, 85 dB CMRR, SPI-compatible 3-wire interface, and VSSOP-10 package compatibility with space-constrained industrial sensor nodes.

Technical Context

The ADC161S626CIMMX/NOPB implements a capacitive redistribution SAR architecture with integrated sample-and-hold, maintaining full differential signal path from +IN/−IN inputs through conversion to ensure high common-mode rejection. Its internal timing is fully synchronous to the external SCLK, requiring exactly 18 clock cycles per full 16-bit conversion.

It operates in two distinct functional modes: conversion mode (active sampling and digitization) and zero-power track mode (ZPTM), where the internal sampling capacitor tracks the analog input with no power consumption beyond leakage-enabling wake-up delay of 0 µs and seamless transition between low-power and active states.

Key Specifications

Pinout & Package

The ADC161S626CIMMX/NOPB is housed in a 10-pin VSSOP package (3.00 mm × 3.00 mm), optimized for compact PCB layouts and thermal performance (θ_JA = 163°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8860IDRCT and AD7980BRMZ, the ADC161S626CIMMX/NOPB uniquely combines independent VIO/VA rails, true differential input, and guaranteed 85 dB CMRR in a 3 mm × 3 mm package-making it the only option among the three qualified for low-noise, mixed-supply, bridge-based sensing without external support circuitry.

Availability

ADC161S626CIMMX/NOPB is available at Aetrix Electronics and suitable for direct sensor interface, I/O modules, data acquisition, portable systems, and motor control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADC161S626CIMMX/NOPB 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 ADC161S626CIMMX/NOPB belongs to TI's precision SAR ADC product line, designed specifically for high-accuracy, low-power, differential-input applications in battery-operated and noise-sensitive industrial systems.

FAQ

What is the maximum sampling rate of the ADC161S626CIMMX/NOPB?

The ADC161S626CIMMX/NOPB supports a maximum sampling rate of 250 kSPS, validated across the full operating temperature range (−40°C to +85°C) and at clock frequencies up to 5 MHz. At this rate, it consumes 5.8 mW from a 5 V analog supply and delivers 93.2 dBc SNR and ±0.8 LSB INL-ensuring high fidelity for demanding data acquisition tasks. The ADC161S626CIMMX/NOPB maintains guaranteed performance down to 50 kSPS, making it adaptable to both high-speed and ultra-low-power use cases.

Does the ADC161S626CIMMX/NOPB require an external reference voltage?

Yes, the ADC161S626CIMMX/NOPB requires an external reference voltage applied to the VREF pin, which can range from 0.5 V to VA. This reference defines the full-scale differential input range (±VREF), and its value directly determines LSB size-for example, a 5 V reference yields a 152.6 µV LSB. The ADC161S626CIMMX/NOPB does not include an internal reference; using an external precision reference (e.g., REF5025) ensures optimal accuracy and temperature stability.

Can the ADC161S626CIMMX/NOPB interface directly with a 3.3 V microcontroller?

Yes, the ADC161S626CIMMX/NOPB supports direct interface with 3.3 V microcontrollers via its independent VIO supply pin, which accepts 2.7–5.5 V. When VIO = 3.3 V, digital inputs (CS, SCLK) recognize standard 3.3 V logic levels, and DOUT outputs compatible 3.3 V–compliant signals-eliminating need for level shifters. Meanwhile, VA can remain at 5 V to maximize analog performance, preserving SNR and linearity without compromising digital interoperability.

What is Zero-Power Track Mode (ZPTM) and how does it benefit system design?

Zero-Power Track Mode (ZPTM) is a low-power state entered automatically when CS is high, during which the ADC161S626CIMMX/NOPB's internal sampling capacitor continuously tracks the analog input voltage with <3 µA supply current and zero wake-up delay. This eliminates conversion latency when resuming sampling and reduces average power in burst-mode or event-triggered acquisition-critical for battery longevity in portable systems. ZPTM is intrinsic to the ADC161S626CIMMX/NOPB's architecture and requires no configuration registers or firmware overhead.

Is the ADC161S626CIMMX/NOPB pin-compatible with other TI SAR ADCs in VSSOP-10?

No, the ADC161S626CIMMX/NOPB is not pin-compatible with other TI VSSOP-10 SAR ADCs such as the ADS8860 or ADS7953-the pin functions (e.g., dual GND, separate VREF, VIO, VA) and signal routing are unique to its differential, dual-supply architecture. Layout reuse is not possible without verification against the specific pinout table in the ADC161S626CIMMX/NOPB datasheet (SNAS468D). Always validate PCB footprint and net assignments against the official device marking and function diagram.