Texas Instruments ADC122S706CIMT/NOPB

Overview

ADC122S706CIMT/NOPB from Texas Instruments is a dual 12-bit, simultaneous-sampling SAR ADC with true differential inputs per channel, 500 kSPS to 1 MSPS throughput, ±1 LSB INL (max), 71 dBc SNR (min), and operation over −40°C to +105°C - used in motor control for synchronized current/voltage sensing.

For engineers reviewing the ADC122S706CIMT/NOPB datasheet, ADC122S706CIMT/NOPB pinout, ADC122S706CIMT/NOPB application, or ADC122S706CIMT/NOPB equivalent, key selection criteria include guaranteed simultaneous sampling, external reference flexibility (1.0 V to VA), dual serial outputs (DOUTA/DOUTB), SPI/QSPI/MICROWIRE compatibility, and TSSOP-14 package thermal performance (θJA = 121°C/W).

Technical Context

The ADC122S706CIMT/NOPB implements two independent successive-approximation register (SAR) cores with shared clock and chip select, enabling true simultaneous sampling of CHA± and CHB± while preserving inter-channel phase coherence. Its differential track-and-hold maintains common-mode rejection across the full signal chain.

It supports dual-output mode (DUAL = high) with binary 2's complement data on separate DOUTA/DOUTB pins, or single-output mode (DUAL = low) with interleaved A/B results on DOUTA only. Conversion requires exactly 16 SCLK cycles, with acquisition time of 3 SCLK cycles and aperture delay of 6 ns.

Key Specifications

Pinout & Package

ADC122S706CIMT/NOPB is housed in a 14-lead TSSOP package (JEDEC MO-153, 5.0 mm × 4.4 mm × 1.2 mm), optimized for thermal dissipation (θJA = 121°C/W) and PCB space efficiency in industrial control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW and AD7321BRUZ, ADC122S706CIMT/NOPB uniquely delivers guaranteed simultaneous sampling in a single TSSOP-14 package with externally adjustable reference and dual serial outputs - making it optimal for phase-sensitive, space-constrained, and power-aware industrial control designs.

Availability

ADC122S706CIMT/NOPB is available at Aetrix Electronics and suitable for motor control, power metering, multi-axis positioning, and industrial instrumentation requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADC122S706CIMT/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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The ADC122S706CIMT/NOPB belongs to TI's high-performance SAR ADC product line, designed specifically for real-time, phase-coherent signal acquisition in motor drives, energy monitoring, and automated test equipment.

FAQ

What is the guaranteed simultaneous sampling performance of ADC122S706CIMT/NOPB?

The ADC122S706CIMT/NOPB guarantees true simultaneous sampling of both channels - meaning CHA± and CHB± are acquired at the exact same instant, preserving relative phase information. This is achieved via dual independent SAR cores sharing one conversion clock and is validated across the full −40°C to +105°C temperature range and 500 kSPS to 1 MSPS sample rates. The ADC122S706CIMT/NOPB datasheet specifies no inter-channel skew beyond aperture delay matching (≤6 ns), making it suitable for vector control and power quality analysis where phase coherence is mandatory.

Can ADC122S706CIMT/NOPB operate with different analog and digital supply voltages?

Yes, ADC122S706CIMT/NOPB supports independent analog (VA) and digital (VD) supplies: VA ranges from 4.5 V to 5.5 V, and VD ranges from 2.7 V to VA. This separation minimizes digital switching noise coupling into the analog domain. For example, ADC122S706CIMT/NOPB can be operated with VA = 5.0 V (for clean analog reference and input stage) and VD = 3.3 V (to interface directly with 3.3 V microcontrollers), reducing EMI and improving SNR by up to 2 dB compared to single-supply configurations.

How does the DUAL pin affect data output behavior in ADC122S706CIMT/NOPB?

The DUAL pin on ADC122S706CIMT/NOPB selects between dual-output and single-output modes. When DUAL = high (e.g., tied to VD), DOUTA outputs Channel A's 12-bit result and DOUTB outputs Channel B's result concurrently. When DUAL = low (e.g., grounded), both results appear sequentially on DOUTA (Channel A first, then Channel B), and DOUTB enters high-impedance state. This flexibility allows designers to choose between minimal latency (dual mode) or reduced pin count/interface complexity (single mode) without changing firmware protocol - both modes retain full 12-bit resolution and timing compliance.

What reference voltage range is supported by ADC122S706CIMT/NOPB, and how does it impact input range?

ADC122S706CIMT/NOPB accepts an external reference voltage (VREF) from 1.0 V to VA. The differential input range is strictly ±VREF - for example, with VREF = 2.5 V, the full-scale range is −2.5 V to +2.5 V differentially. This direct scaling enables precise matching to sensor output spans (e.g., ±2 V from isolation amplifiers) and avoids gain errors introduced by internal references. The ADC122S706CIMT/NOPB reference current is 105 µA max at 1 MSPS, requiring low-impedance buffering if sourced from a high-impedance DAC or bandgap.

Is ADC122S706CIMT/NOPB compatible with standard serial interfaces like SPI and QSPI?

Yes, ADC122S706CIMT/NOPB features a SPI™/QSPI™/MICROWIRE/DSP-compatible serial interface. It uses standard signals - CS (active-low chip select), SCLK (serial clock), and DOUTA/DOUTB (data outputs) - with MSB-first, binary 2's complement format and 4 leading zero bits. No special framing or command bytes are required; it operates as a standard slave device. The ADC122S706CIMT/NOPB timing complies with SPI Mode 0 (CPOL = 0, CPHA = 0), supporting seamless integration with TI C2000™, ST STM32, and NXP Kinetis microcontrollers without custom driver development.