ADS8320-HT - 16-Bit 100kSPS High-Temp SAR ADC | Texas Instruments
MPN: ADS8320-HT ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ADS8320-HT Overview
An ADC converts continuous analog signals into discrete digital values for processing by MCUs or DSPs. Within the data-converter hierarchy, the ADS8320-HT belongs to the SAR ADC family, which trades lower throughput than delta-sigma converters for low latency, low power, and simple single-shot operation - ideal for high-temperature data acquisition nodes.
Key features include true 16-bit resolution, a differential input for flexible signal conditioning, and a reference input that accepts any voltage from 500 mV to VCC, letting designers scale the full-scale range to match sensors directly. The synchronous serial interface (SPI/SSI compatible) connects easily to microcontrollers and DSPs. Micropower consumption at the full 100 kSPS data rate makes it one of the few 16-bit ADCs viable for battery-operated high-temperature systems.
Architecturally, the SAR core uses an internal sample-and-hold with capacitor DAC, providing deterministic conversion latency with no pipeline delay. Ensured specifications across the full -55C to +210C range - rather than the -40C to +125C industrial limit of standard parts - distinguish the -HT grade, enabled by TI's high-temperature qualification flow and hermetic ceramic packaging that resists long-term thermal stress.
Typical applications include downhole drilling telemetry, jet-engine and geothermal sensing, industrial process monitoring near furnaces, and aerospace instrumentation, where silicon reliability above 150C is mandatory and power budgets are tight.
Design tip: decouple VCC and REF carefully at 210C, since reference noise directly scales with the reduced full-scale range; use low-ESR ceramic capacitors rated for the temperature and keep the serial clock lines short to preserve 16-bit noise performance.
Drop-in alternatives for ADS8320-HT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS8320-HT (same form factor and footprint) — differing in Package, Architecture, Input Type, Interface, Operating Temperature.
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No drop-in alternatives available for this product.
Request AlternativesADS8320-HT Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sampling Rate | 100 kSPS |
| Converter Type | SAR (successive approximation register) |
| Supply Voltage Range | 2.7 V to 5.25 V |
| Reference Voltage Range | 500 mV to VCC |
| Input Type | Differential |
| Interface | Synchronous serial (SPI/SSI compatible) |
| Operating Temperature | -55C to +210C |
| Package | 8-pin ceramic surface-mount |
| Mounting Type | Surface Mount |
| Power Consumption | Micropower at full 100 kHz data rate |
| Grade | High Temperature (-HT) |
| Pipeline Delay | None (deterministic SAR latency) |
ADS8320-HT Pin Configuration
| Pin 1 | VREF — Reference voltage input (500 mV to VCC) |
| Pin 2 | +IN — Non-inverting differential input |
| Pin 3 | -IN — Inverting differential input |
| Pin 4 | GND — Ground |
| Pin 5 | CS/SHDN — Chip select / shutdown (active low) |
| Pin 6 | DCLOCK — Serial data clock input |
| Pin 7 | DOUT — Serial data output |
| Pin 8 | VCC — Power supply (2.7V to 5.25V) |
Typical Applications
ADS8320-HT is suitable for 6 applications: Downhole Drilling Telemetry, Jet Engine and Aerospace Instrumentation, Geothermal and Industrial Process Sensing, Battery-Powered High-Temperature Data Loggers, Automotive and Engine Test Bench Acquisition, High-Temperature IoT and Remote Sensor Nodes.
Downhole Drilling Telemetry
The ADS8320-HT's -55C to +210C rating and 8-pin ceramic package make it ideal for downhole measurement-while-drilling tools, where geothermal gradient plus friction heating pushes electronics above 175C. Its micropower consumption at the full 100 kSPS rate extends battery life in tools with no recharging opportunity, and the differential input accommodates strain-gauge and pressure-sensor bridges directly by scaling VREF from 500 mV to VCC to match full-scale signals.
Recommended
Jet Engine and Aerospace Instrumentation
Turbine and airframe monitoring places sensors in 150C-210C zones where plastic-packaged ADCs fail. The ADS8320-HT's hermetic ceramic package and HT-grade qualification provide deterministic 16-bit conversion with no pipeline latency, useful for closed-loop controls. The SPI/SSI-compatible serial interface links naturally to DSPs used in avionics, and 2.7V-5.25V operation fits legacy aerospace supply rails without additional regulation stages.
Recommended
Geothermal and Industrial Process Sensing
Geothermal wells and furnace-adjacent process monitoring require conversion within 210C ambient. The ADS8320-HT converts thermocouple-conditioned differential signals at up to 100 kSPS while consuming micropower, keeping local electronics cool. Setting VREF near 500 mV boosts effective sensitivity for low-amplitude sensor outputs, and the SAR architecture delivers single-shot conversions with simple firmware control via CS, DCLOCK, and DOUT lines.
Recommended
Battery-Powered High-Temperature Data Loggers
Portable loggers used in wells, autoclaves, and engine test cells need 16-bit accuracy with minimal energy draw. The ADS8320-HT operates at very low power even at the full 100 kHz data rate and can be fully shut down via the CS/SHDN pin between conversions, stretching battery life. Its 2.7V minimum supply allows direct operation from two-cell or lithium primaries without a boost converter, reducing quiescent losses in the power path.
Recommended
Automotive and Engine Test Bench Acquisition
Engine-compartment and exhaust-mounted sensors routinely exceed 150C during test cycles. The ADS8320-HT digitizes pressure, knock, and thermocouple channels near the sensing point, shortening analog runs and improving noise immunity. The 16-bit resolution captures fine dynamic detail, while the SPI interface integrates with bench controllers; single-shot conversion timing simplifies synchronization with crank-angle triggers in transient test captures.
Recommended
High-Temperature IoT and Remote Sensor Nodes
Industrial IoT nodes installed near boilers, kilns, and compressors combine microcontroller intelligence with 16-bit analog capture. The ADS8320-HT's serial interface pairs with low-power MCUs, and micropower conversion plus software shutdown keeps average current within energy-harvesting budgets. Differential inputs reject common-mode noise from long sensor leads, and the 500 mV minimum VREF allows direct digitization of small-signal sensors without a gain stage.
Recommended
Recommended Products Summary
Engineering reference data for ADS8320-HT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8320IB | ADS8320E |
|---|---|---|---|
| Package | 8-pin ceramic SMD | VSSOP-8 (plastic) | VSSOP-8 (plastic) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS |
| Supply Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Temperature Range | -55C to +210C | -40C to +125C (industrial) | -40C to +85C |
| 210C Capability | Yes | No | No |
| Interface | SPI/SSI compatible serial | SPI/SSI compatible serial | SPI/SSI compatible serial |
Key Differentiators
- Qualified to 210C ambient (vs ADS8320IB)
- Micropower at full speed (vs ADS8320E)
- Adjustable full-scale from 500 mV (vs ADS8320IB)
Design Notes
Decouple VCC and VREF with low-ESR ceramic capacitors rated for 210C operation, placed as close to pins 1 and 8 as possible. At reduced VREF settings the LSB size shrinks proportionally, so reference noise couples directly into conversion results; consider an RC filter between the reference source and VREF. Hermetic ceramic packages solder differently than plastic - verify reflow profiles for high-temperature solders such as SnSb alloys used in 210C assemblies.
Keep DCLOCK and DOUT traces short and route them away from the +IN/-IN differential pair to prevent digital coupling into the analog front-end during conversion. Driving CS/SHDN high between conversions shuts the device down for power savings, but allow the specified wakeup time before the first conversion. Ground the -IN input near the sensor for single-ended signals to preserve common-mode rejection.
Do not exceed VCC on the VREF pin or apply reference voltages below 500 mV - accuracy is no longer ensured outside this range. Ensure the supply stays within 2.7V to 5.25V across the full temperature sweep, since derating of upstream regulators at 210C can cause brownouts at elevated temperature. Confirm that all surrounding passives and PCB laminate are rated for the same 210C ambient.
Compliance Information
Compliance data not present in retrieved web data. Check TI product page for RoHS and REACH status of the -HT ceramic package.
