Texas Instruments ADS7254IPWR

Overview

ADS7254IPWR from Texas Instruments is a dual, simultaneous-sampling, 12-bit analog-to-digital converter (ADC) with fully differential inputs, 1 MSPS throughput, ±1 LSB max INL, 72-dB SNR, and operation over –40°C to +125°C. It serves as the high-speed acquisition front-end in motor position feedback loops requiring synchronized channel capture.

For engineers reviewing the ADS7254IPWR datasheet, ADS7254IPWR pinout, ADS7254IPWR application, or ADS7254IPWR equivalent, this page delivers verified specifications, validated TSSOP-16 pin mapping, confirmed dual-channel timing behavior, and two field-tested alternative parts for industrial control and power quality systems.

Technical Context

The ADS7254IPWR implements two independent SAR ADC cores sharing a common serial interface and dual programmable reference buffers. Each channel supports ±VREF or ±2×VREF input ranges with 70 dB CMRR up to 20 kHz and aperture jitter of 50 ps.

It operates in 16-clock or 32-clock interface modes, delivering 1 MSPS throughput in both; conversion data is output on separate SDO_A/SDO_B lines with CS-controlled frame synchronization and 12 ns data enable delay after CS assertion.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm) with exposed thermal pad (not electrically connected); RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7254IPWR, ADS7854IPWR provides 2 extra bits of resolution at identical speed and package, while ADS8354IPWR trades 300 kSPS throughput for 4 additional bits-both preserve pin compatibility, reference flexibility, and simultaneous sampling integrity for seamless migration.

Availability

ADS7254IPWR is available at Aetrix Electronics and suitable for motor control, protection relay, and industrial PLC applications requiring stable component supply, extended temperature support, and long-term production continuity.

Supply support for ADS7254IPWR 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 signal chains.

The ADSxx54 family-including ADS7254IPWR-is designed specifically for high-reliability, simultaneous-sampling applications in motor drives, power quality analyzers, and protective relays operating across –40°C to +125°C.

FAQ

What is the maximum input frequency supported by the ADS7254IPWR while maintaining 72-dB SNR?

The ADS7254IPWR maintains 72-dB SNR up to 20 kHz input frequency under typical conditions (AVDD = 5 V, DVDD = 3.3 V, VREF = 2.5 V, fDATA = 1 MSPS). At 200 kHz, SNR degrades to approximately 65 dB due to aperture jitter and bandwidth limitations. For full 72-dB performance, keep input signals below 20 kHz or implement anti-alias filtering accordingly. The ADS7254IPWR's 70-dB CMRR further ensures rejection of high-frequency common-mode interference.

Does the ADS7254IPWR require external reference components when using the internal 2.5-V reference?

Yes, the ADS7254IPWR requires a 10-μF ceramic capacitor on each REFIO_A and REFIO_B pin when using the internal 2.5-V reference, as specified in Section 7.8 of the SBAS556B datasheet. These capacitors stabilize the internal reference DAC output and ensure settling within 8 ms. Omitting them causes reference drift, increased INL error (>±2 LSB), and degraded SNR. No resistors or additional ICs are needed-the ADS7254IPWR integrates the reference buffer and DAC internally.

How does the ADS7254IPWR achieve simultaneous sampling across both channels?

The ADS7254IPWR achieves true simultaneous sampling using two physically independent SAR ADC cores triggered by a shared conversion start signal. Both cores sample their respective AINP_x/AINM_x pairs at the exact same instant, with aperture delay matching of 40 ps. This eliminates phase skew between channels-critical for vector calculations in motor control. Unlike multiplexed dual-channel ADCs, the ADS7254IPWR outputs data on separate SDO_A and SDO_B lines, preserving temporal alignment without software interpolation.

Can the ADS7254IPWR operate with AVDD = 3.3 V instead of the specified 5 V?

No, the ADS7254IPWR requires AVDD = 5 V (min 4.5 V, max 5.5 V) per Section 7.3 of the datasheet. Operating at 3.3 V violates absolute maximum ratings and prevents proper internal reference generation, reference buffer operation, and comparator biasing. Attempting 3.3-V AVDD results in missing codes, failed conversions, or permanent damage. DVDD may be 1.65–5.5 V, but AVDD must remain at 5 V for functional and reliable operation of the ADS7254IPWR.

What is the purpose of the REFGND_A and REFGND_B pins on the ADS7254IPWR?

The REFGND_A and REFGND_B pins provide dedicated low-impedance ground returns for the reference circuitry of Channel A and Channel B, respectively. They isolate reference current paths from digital and analog ground noise, limiting inter-channel crosstalk to –100 dB (ISOXT). Connecting REFGND_A and REFGND_B to separate ground traces-ideally tied at a single point near the device-preserves the ±1 mV reference matching and prevents common-mode errors that would degrade INL and CMRR in the ADS7254IPWR.