Texas Instruments ADC122S625CIMMX/NOPB

Overview

ADC122S625CIMMX/NOPB from Texas Instruments is a dual 12-bit simultaneous-sampling SAR ADC with true differential inputs per channel, 50–200 kSPS conversion rate, ±1 LSB INL (max), and SPI/QSPI/MICROWIRE-compatible serial interface - used in motor control systems to preserve phase coherence between current and voltage sensing channels.

For engineers reviewing the ADC122S625CIMMX/NOPB datasheet, ADC122S625CIMMX/NOPB pinout, ADC122S625CIMMX/NOPB application, or ADC122S625CIMMX/NOPB equivalent, key selection criteria include simultaneous sampling integrity, differential input common-mode range (−VREF to +VREF), 71 dBc SNR (min), 2.6 µW power-down consumption, and VSSOP-10 package compatibility with space-constrained industrial sensor interfaces.

Technical Context

The ADC122S625CIMMX/NOPB implements two independent successive-approximation register (SAR) cores sharing one external reference and serial interface, enabling true simultaneous sampling with matched acquisition timing and <0.02 LSB INL/DNL matching between channels. Its internal track-and-hold maintains differential signal integrity from input pins through conversion.

It operates with a single 4.5–5.5 V analog supply (VA), accepts an external reference from 1.0 V to VA, and delivers binary 2's complement output via a single DOUT line - with 4 leading zeros separating Channel A's 12-bit result from Channel B's 12-bit result on falling SCLK edges.

Key Specifications

Pinout & Package

ADC122S625CIMMX/NOPB is housed in a 10-lead Very Small Outline Package (VSSOP) with 0.5 mm lead pitch, optimized for high-density PCB layouts and thermal performance (θJA = 240°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IDRCT and AD7321BRUZ, ADC122S625CIMMX/NOPB uniquely balances 200 kSPS simultaneous sampling, 2.6 µW power-down, and VSSOP-10 size - making it optimal for space- and power-constrained real-time control where phase coherence matters more than 16-bit resolution or multi-range configurability.

Availability

ADC122S625CIMMX/NOPB is available at Aetrix Electronics and suitable for motor control, power monitoring, and multi-axis positioning systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADC122S625CIMMX/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 ADC122S625CIMMX/NOPB belongs to TI's high-performance SAR ADC product line, engineered specifically for real-time industrial control applications demanding synchronized dual-channel acquisition, low power, and robust operation across extended temperature ranges.

FAQ

What is the maximum sample rate supported by the ADC122S625CIMMX/NOPB?

The ADC122S625CIMMX/NOPB supports a maximum sample rate of 200 kSPS per channel with true simultaneous sampling. This rate is achieved using a 6.4 MHz SCLK and requires CS to be held low continuously. At this rate, total power consumption is 8.6 mW (typ) with VA = 5 V and VREF = 2.5 V. The minimum sample rate is 50 kSPS.

Does the ADC122S625CIMMX/NOPB support single-ended input configurations?

Yes, the ADC122S625CIMMX/NOPB supports single-ended operation: tie CHA− or CHB− to a stable bias voltage (e.g., VREF/2), and drive CHA+ or CHB+ with the signal. Performance remains strong - only minor SNR degradation versus differential mode - and full dynamic range is preserved when VREF ≤ VA/2. The datasheet provides verified application circuits for this configuration.

How does the ADC122S625CIMMX/NOPB handle channel-to-channel timing skew?

The ADC122S625CIMMX/NOPB achieves true simultaneous sampling via shared clocking and matched internal track-and-hold paths, resulting in <1 ns inter-channel aperture jitter and guaranteed zero skew in acquisition timing. This is confirmed by its −90 dBc channel-to-channel isolation and <0.02 LSB INL matching - critical for vector control and phase-sensitive measurements where timing coherence directly impacts system accuracy.

What reference voltage range is valid for the ADC122S625CIMMX/NOPB?

The ADC122S625CIMMX/NOPB accepts an external reference voltage (VREF) from 1.0 V to VA (4.5–5.5 V). Operation below 1.0 V is possible but degrades SNR and increases effective LSB size relative to noise floor. For optimal performance, TI recommends VREF = 2.5 V with VA = 5 V - yielding a ±2.5 V differential input range and 1.22 mV/LSB step size.

Is the ADC122S625CIMMX/NOPB pin-compatible with other members of the ADC122S family?

No - the ADC122S625CIMMX/NOPB is not pin-compatible with ADC122S021 or ADC122S051. It uses a unique 10-pin VSSOP layout with dedicated CHA+/CHA−/CHB+/CHB− inputs and shared SCLK/CS/DOUT. Pin assignments differ across the family due to distinct channel count, sampling architecture (simultaneous vs. pseudo-simultaneous), and interface options. Always verify pin mapping against SNAS451A before board reuse.