Texas Instruments ADS8361IRHBR

Overview

ADS8361IRHBR from Texas Instruments is a dual, 16-bit, 500kSPS simultaneous-sampling SAR analog-to-digital converter with four fully differential input channels (A0/A1/B0/B1), internal 2.5V reference, and flexible serial interface. It delivers ±8 LSB integral linearity error, 83 dB SNR, and 80 dB CMRR at 50 kHz for high-precision motor control and multi-axis positioning systems.

For engineers reviewing the ADS8361IRHBR datasheet, ADS8361IRHBR pinout, ADS8361IRHBR application, or ADS8361IRHBR equivalent, key selection factors include simultaneous dual-channel sampling capability, QFN-32 package thermal performance, 2.5V internal reference accuracy (±1%), and compatibility with 3V/5V digital I/O logic families.

Technical Context

The ADS8361IRHBR uses two independent successive approximation register (SAR) cores with matched sample-and-hold amplifiers to enable true simultaneous acquisition across channel pairs (A0/A1 and B0/B1). Its fully differential analog front-end maintains signal integrity with 25 pF input capacitance and 20 Ω switch resistance per input.

Control is implemented via three address pins (M0, M1, A0) that configure operation between two-channel (A0/B0 or A1/B1) and four-channel sequential modes, while serial data output routing (dual-port vs. single-port) is managed by M1. The BUSY signal synchronizes read timing after conversion completion.

Key Specifications

Pinout & Package

ADS8361IRHBR is packaged in a 5 mm × 5 mm QFN-32 with exposed thermal pad (internally connected to substrate; may be tied to AGND or left floating). Pin 1 is located at bottom-left corner adjacent to pin 1 marker; pin 32 is top-right corner. Thermal pad must be isolated from digital ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8361IRHBR, ADS8363IRHBR adds integrated clocking at no pinout change, while AD7656ASTZ trades speed for channel density and requires external reference design effort-both serve distinct architecture trade-offs rather than drop-in replacements.

Availability

ADS8361IRHBR 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 temperature ranges and long production lifecycles.

Supply support for ADS8361IRHBR 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 high-precision data converters and industrial-grade reliability.

The ADS8361IRHBR belongs to TI's precision SAR ADC product line, designed specifically for real-time control applications demanding simultaneous sampling, wide temperature operation, and integrated reference stability.

FAQ

What is the maximum clock frequency supported by ADS8361IRHBR?

The ADS8361IRHBR supports an external CMOS-compatible clock from 100 kHz to 10 MHz. At 10 MHz, it achieves its rated 500 kSPS throughput (f_SAMPLE = f_CLOCK/20). Clock periods below 100 ns (i.e., >10 MHz) violate t_CKL/t_CKH minimums and risk conversion failure. The ADS8361IRHBR does not include an internal oscillator-external clocking is mandatory.

Does ADS8361IRHBR require external decoupling capacitors?

Yes, ADS8361IRHBR requires dedicated decoupling: a 0.1 μF ceramic capacitor and a 10 μF tantalum capacitor between AVDD (pin 13) and AGND (pin 12); and a 0.1 μF ceramic capacitor between BVDD (pin 24) and BGND (pin 1). These minimize supply noise coupling into analog and digital domains, directly impacting SNR and INL performance per datasheet test conditions.

Can ADS8361IRHBR operate with a 3.3V digital supply?

Yes, ADS8361IRHBR supports BVDD from 2.7 V to 5.5 V, including standard 3.3 V logic levels. When BVDD = 3.3 V, digital inputs meet LVCMOS thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and outputs drive VOH ≥ 3.1 V and VOL ≤ 0.2 V at –100 μA load-fully compatible with 3.3 V microcontrollers and FPGAs without level-shifting.

How is simultaneous sampling implemented in ADS8361IRHBR?

ADS8361IRHBR uses two independent sample-and-hold amplifiers and SAR cores-one for channels A0/A1 and one for B0/B1. A single CONVST pulse places both SHAs into hold mode simultaneously, freezing input voltages at identical instants. Aperture delay matching is guaranteed to ≤100 ps, ensuring phase coherence critical for vector control and power quality analysis.

What is the purpose of the thermal pad on the ADS8361IRHBR QFN package?

The exposed thermal pad on the ADS8361IRHBR QFN-32 package is internally connected to the silicon substrate and serves as the primary heat dissipation path. TI recommends soldering it to a dedicated thermal land tied to AGND (not BGND) to maintain analog ground integrity. Proper pad layout reduces junction-to-board thermal resistance by >70%, enabling full 150 mW power dissipation within the +125°C ambient rating.