Texas Instruments ADS8361IRHBT

Overview

ADS8361IRHBT from Texas Instruments is a dual, 16-bit, 500kSPS simultaneous-sampling analog-to-digital converter with four fully differential input channels (CH A0±, A1±, B0±, B1±), internal 2.5V reference, and QFN-32 (5×5 mm) package. 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 ADS8361IRHBT datasheet, ADS8361IRHBT pinout, ADS8361IRHBT application, or ADS8361IRHBT equivalent, this page provides verified technical context, real-world timing behavior, confirmed serial interface operation modes, and validated alternative options for industrial signal acquisition designs requiring simultaneous dual-channel sampling and bipolar input support.

Technical Context

The ADS8361IRHBT implements two independent successive approximation register (SAR) ADC cores, each with dedicated sample-and-hold amplifiers maintaining full differential signal paths to achieve 80 dB common-mode rejection. Its 2 μs per-channel conversion time and 4 μs total four-channel throughput are synchronized by an external 10 MHz clock (f_CLK), requiring exactly 20 clock cycles per 16-bit conversion.

Control logic uses M0/M1/A0 pins to configure two-channel (A0/B0 or A1/B1) or four-channel sequential operation, while M1 selects dual-output (Serial A + Serial B) or single-output (Serial A only) data transmission. The internal 2.5 V reference (±1% initial accuracy, ±20 ppm/°C drift) is buffered and can drive up to 10 μA load with 0.1 μF/10 μF decoupling.

Key Specifications

Pinout & Package

ADS8361IRHBT is housed in a thermally enhanced QFN-32 (5 mm × 5 mm, 0.5 mm pitch) package with exposed thermal pad internally connected to substrate. Pin 1 is CH B1+, pin 32 is BVDD; pins marked NC are not internally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8363IRHBT, ADS8361IRHBT trades integrated clock generation for lower power and simpler timing validation; versus AD7656ASTZ, it delivers higher per-channel throughput in half the footprint but with fewer total channels-making ADS8361IRHBT ideal for space-constrained dual-loop industrial controllers.

Availability

ADS8361IRHBT 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 ADS8361IRHBT 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 industrial-grade ADC design expertise.

The ADS8361IRHBT belongs to TI's high-precision simultaneous-sampling ADC product line, engineered specifically for real-time control systems demanding deterministic latency, channel matching, and robustness in electrically noisy factory-floor environments.

FAQ

What is the maximum clock frequency supported by ADS8361IRHBT?

The ADS8361IRHBT accepts an external CMOS-compatible clock from 100 kHz to 10 MHz. At 10 MHz, it achieves its rated 500 kSPS aggregate throughput, requiring exactly 20 clock cycles per 16-bit conversion. Operation below 100 kHz reduces sampling rate linearly per f_SAMPLE = f_CLOCK/20, and the ADS8361IRHBT maintains full DC accuracy down to DC-coupled static measurements.

Does ADS8361IRHBT require an external reference voltage?

No, the ADS8361IRHBT includes an internal 2.5 V reference with ±1% initial accuracy and ±20 ppm/°C drift. For self-contained operation, connect REFOUT (pin 10) directly to REFIN (pin 9). An external reference from 1.2 V to 2.6 V may be used to scale full-scale range, but the ADS8361IRHBT's internal reference eliminates BOM cost and layout area in most industrial applications.

How does ADS8361IRHBT handle bipolar input signals?

The ADS8361IRHBT natively accepts bipolar differential inputs from –V_REF to +V_REF (i.e., ±2.5 V) centered at its internal 2.5 V reference. For standard ±2.5 V, ±5 V, or ±10 V sensor outputs, a simple op-amp level-shift circuit (e.g., OPA227 with four resistors) referenced to REFOUT converts the signal to the ADS8361IRHBT's compatible range without degrading SNR or linearity.

What is the function of the M0, M1, and A0 pins on ADS8361IRHBT?

M0 selects two-channel (M0=0) or four-channel sequential (M0=1) operation; M1 chooses dual-output (M1=0) or single-output (M1=1) data routing; A0 selects Channel 0 (A0=0) or Channel 1 (A0=1) in two-channel mode. These pins enable flexible configuration without firmware changes-e.g., M0=1/M1=0/A0=don't-care sets ADS8361IRHBT to acquire all four channels sequentially with data on both Serial A and Serial B outputs.

Is ADS8361IRHBT pin-compatible with any other TI ADCs?

Yes, the ADS8361IRHBT is pin-compatible with the ADS7861 (12-bit predecessor) in the same QFN-32 package, allowing direct upgrade paths in existing designs. However, ADS8361IRHBT requires updated firmware to handle 16-bit data words and revised timing due to its faster 500 kSPS rate-no PCB layout changes are needed, but software must accommodate extended word length and tighter setup/hold requirements.