Texas Instruments ADS8320SHKJ

Overview

ADS8320SHKJ from Texas Instruments is a 16-bit, successive-approximation-register (SAR) analog-to-digital converter optimized for extreme-temperature operation (–55°C to 210°C), delivering 100-kHz throughput with 3.8 mW power at 2.7 V and featuring differential inputs (+IN/–IN), external reference support (0.5 V to VCC), and SPI/SSI-compatible serial interface. It serves in down-hole drilling sensor front-ends where high-temperature stability and micropower sampling are critical.

For engineers reviewing the ADS8320SHKJ datasheet, ADS8320SHKJ pinout, ADS8320SHKJ application, or ADS8320SHKJ equivalent, key selection criteria include guaranteed 16-bit no-missing-codes performance across –55°C to 210°C, 45-pF input capacitance requiring ≤4.5-clock-cycle settling, and CS/SHDN-controlled power-down mode drawing ≤6 µA.

Technical Context

The ADS8320SHKJ implements a capacitive redistribution SAR architecture fabricated on 0.6-µm CMOS, integrating an inherent sample-and-hold function. Conversion is initiated by CS falling edge, with analog input sampled differentially between +IN and –IN-where –IN is held fixed (e.g., remote ground sense) and not re-sampled mid-cycle.

Digital output is synchronous serial, MSB-first, clocked by DCLOCK on falling edges; DOUT becomes valid after five clock cycles and outputs 16 data bits followed by LSB-first repetition. The device operates with external clock (24 kHz–2.4 MHz) and external reference (0.5 V to VCC), enabling flexible full-scale range configuration without internal reference dependency.

Key Specifications

Pinout & Package

ADS8320SHKJ is housed in an 8-pin ceramic surface-mount package (HKJ variant), rated for –55°C to 210°C operation. Pin assignments follow TI's standard HKJ top-view layout with dead-bug mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS7816UB and ADS8326IDRCT, the ADS8320SHKJ uniquely delivers production-validated 210°C operation, external reference scalability, and ceramic HKJ packaging-making it the sole option for mission-critical high-temperature data acquisition where reliability cannot be compromised.

Availability

ADS8320SHKJ is available at Aetrix Electronics and suitable for down-hole drilling sensors, high-temperature industrial monitoring, and multi-channel remote data acquisition requiring stable component supply across extended lifecycle and extreme environmental conditions.

Supply support for ADS8320SHKJ 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 high-reliability ICs for industrial, automotive, and aerospace markets.

The ADS8320 product line delivers radiation-tolerant, extreme-temperature ADCs for harsh-environment sensing-designed specifically for oilfield, aerospace, and geothermal instrumentation where conventional silicon fails.

FAQ

What is the maximum operating temperature specification for the ADS8320SHKJ?

The ADS8320SHKJ is fully specified and production-tested for continuous operation from –55°C to 210°C. This includes guaranteed performance for resolution, INL (±0.034% FSR), offset drift (±4 µV/°C), and power-down current (≤6 µA) across the entire range. The ceramic HKJ package and controlled baseline manufacturing ensure reliability under sustained thermal stress, unlike standard-grade ADCs limited to 125°C.

Does the ADS8320SHKJ require an external reference voltage?

Yes, the ADS8320SHKJ requires an external reference voltage applied to the VREF pin. It accepts any stable reference from 0.5 V to VCC, enabling full-scale range customization. With VREF = 2.5 V, LSB = 38.1 µV; with VREF = 5 V, LSB = 76.3 µV. Internal reference is not provided - reference noise and stability directly impact effective resolution and SNR of the ADS8320SHKJ.

How does the CS/SHDN pin control power states in the ADS8320SHKJ?

The CS/SHDN pin serves dual functions: a falling edge initiates conversion and data transfer, while a HIGH logic level forces the ADS8320SHKJ into power-down mode, reducing supply current to ≤6 µA. During active conversion, current draw scales with sample rate (e.g., 3.8 mW at 100 kHz / 2.7 V). The ADS8320SHKJ automatically enters power-down between conversions when CS remains HIGH, making it ideal for burst-mode sensing.

Is the ADS8320SHKJ pin-compatible with other TI SAR ADCs?

Yes, the ADS8320SHKJ is pin-compatible with the ADS7816 and ADS7822 in the same 8-pin HKJ ceramic package. Pin mapping for VREF, +IN, –IN, GND, CS/SHDN, DOUT, DCLOCK, and +VCC matches identically. However, functional differences exist - ADS7816 uses internal reference and lacks –IN flexibility, while ADS8320SHKJ supports external VREF and true differential input configuration.

What is the input capacitance and settling requirement for the ADS8320SHKJ analog inputs?

The ADS8320SHKJ exhibits 45 pF input capacitance on both +IN and –IN pins. To achieve full 16-bit accuracy, the driving source must settle this capacitance to 1 LSB (e.g., 38 µV at 2.5 V reference) within 4.5 clock cycles - requiring low-impedance buffering or careful RC filter design. Input leakage is ≤1 nA, and input impedance exceeds 1 GΩ when sampling is inactive or in power-down mode.