Texas Instruments ADS8320SHKQ

Overview

ADS8320SHKQ 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 at 3.8 mW (2.7 V), with differential input, SPI/SSI-compatible serial interface, and external reference support (0.5 V to V_CC). It serves in down-hole drilling sensor front-ends where micropower, high linearity, and thermal robustness are critical.

For engineers reviewing the ADS8320SHKQ datasheet, ADS8320SHKQ pinout, ADS8320SHKQ application, or ADS8320SHKQ equivalent, key selection considerations include its guaranteed 16-bit no-missing-codes performance across –55°C to 210°C, 8-pin ceramic HKQ package, 45-pF input capacitance requiring ≤4.5-clock-cycle settling, and CS/SHDN-controlled power-down mode drawing ≤6 µA.

Technical Context

The ADS8320SHKQ implements a capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated on a 0.6-µm CMOS process. It acquires and converts at up to 100 kSPS while maintaining ±0.034% FSR integral linearity error and 84 dB SINAD at 1 kHz over full temperature range.

Its synchronous 3-wire serial interface uses DCLOCK-synchronized DOUT (MSB-first), with conversion initiated by CS/SHDN falling edge and data valid after five clock cycles. The device accepts external references from 0.5 V to V_CC, enabling flexible input span scaling, and supports dual supply ranges (2.7–3.3 V and 4.75–5.25 V) with corresponding quiescent current specs.

Key Specifications

Pinout & Package

ADS8320SHKQ is housed in an 8-pin ceramic surface-mount HKQ package (top-view: pins 1–4 left column, 5–8 right column), rated for extreme-temperature operation and hermetically sealed for reliability in corrosive or high-vacuum environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816U and ADS8322IPW, the ADS8320SHKQ uniquely combines ceramic-packaged extreme-temperature operation, true differential input, micropower shutdown, and SPI/SSI interoperability-making it the sole option for down-hole telemetry modules requiring simultaneous thermal resilience, low power, and minimal footprint.

Availability

ADS8320SHKQ is available at Aetrix Electronics and suitable for down-hole drilling instrumentation, high-temperature engine control units, and vibration analysis systems requiring stable component supply across extended product lifecycles and harsh environmental conditions.

Supply support for ADS8320SHKQ 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 components for industrial, automotive, and aerospace markets.

The ADS8320 product line delivers radiation-tolerant, high-temperature ADCs for mission-critical sensing in oilfield, avionics, and power generation systems where failure is not an option.

FAQ

What is the maximum clock frequency supported by the ADS8320SHKQ?

The ADS8320SHKQ supports a DCLOCK frequency range of 0.02 MHz to 2.4 MHz, corresponding to throughput rates from 1 kHz to 100 kHz. At 2.4 MHz, the device achieves its full 100-kSPS capability with 16 clock cycles per conversion plus acquisition overhead. Operation above 2.4 MHz is not characterized or guaranteed, and minimum high/low times must remain ≥200 ns at V_CC ≥2.7 V to ensure reliable timing margins across –55°C to 210°C.

Does the ADS8320SHKQ require an external reference, and what voltage range is supported?

Yes, the ADS8320SHKQ requires an external reference applied to the VREF pin, supporting 0.5 V to V_CC. This allows direct use of precision references such as REF5025 (2.5 V) or REF5050 (5 V), or scaled outputs from bandgap sources. With VREF = 2.5 V, one LSB equals 38.1 µV; with VREF = 5 V, one LSB equals 76.3 µV. Reference current draw is ≤0.9 µA at 10 kHz sampling, minimizing loading on low-power reference ICs.

How does the power-down mode function on the ADS8320SHKQ?

The ADS8320SHKQ enters power-down mode when the CS/SHDN pin is driven HIGH, reducing supply current to ≤6 µA. This state disables the analog core and places DOUT in high-impedance. Power-down is automatically entered after each conversion completes and CS remains HIGH. To resume operation, CS must be pulsed LOW. This feature enables ultra-low average power in burst-sampling applications-e.g., 0.3 mW at 10 kHz-by maximizing dwell time in shutdown between conversions.

What is the input capacitance and settling requirement for the ADS8320SHKQ analog inputs?

The ADS8320SHKQ exhibits 45 pF total input capacitance at +IN and –IN pins. To achieve full 16-bit accuracy, the driving source must settle this capacitance to within 1 LSB (e.g., 38 µV at 2.5 V reference) within 4.5 clock cycles. This requires a source impedance ≤1 kΩ for typical 2.4-MHz clocking. During hold or power-down, input impedance exceeds 1 GΩ, minimizing steady-state loading on high-Z sensors like piezoelectric elements or RTD bridges.

Is the ADS8320SHKQ pin-compatible with other TI ADCs, and which ones?

Yes, the ADS8320SHKQ is pin-compatible with the ADS7816 and ADS7822 in the same 8-pin ceramic HKQ package. However, functional differences exist: ADS7816 is 16-bit but only rated to 125°C and lacks differential input; ADS7822 is 12-bit with 200-kSPS but shares the same pinout and basic interface. This compatibility allows drop-in replacement in legacy designs where thermal or resolution requirements permit, but ADS8320SHKQ's 210°C rating and differential architecture require verification in new layouts.