Texas Instruments ADS8370IRHPT

Overview

ADS8370IRHPT from Texas Instruments is a 16-bit, 600-kHz pseudo-differential SAR analog-to-digital converter with integrated 4.096-V reference, onboard reference buffer, and high-speed serial interface (up to 40 MHz). It delivers ±0.5 LSB typical INL, 89.5 dB SINAD at 1 kHz, and operates from –40°C to +85°C in industrial data acquisition systems.

For engineers reviewing the ADS8370IRHPT datasheet, ADS8370IRHPT pinout, ADS8370IRHPT application, or ADS8370IRHPT equivalent, key selection considerations include its zero-latency operation, selectable 2's complement/straight binary output format, nap mode (3 mA), and power-down current of 2 µA - critical for portable medical instruments and optical networking front-ends.

Technical Context

The ADS8370IRHPT implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting pseudo-differential input (0 V to 4.2 V) and internal reference buffering. Its conversion control uses CONVST qualified by CS, with BUSY signaling active conversion state and FS enabling frame-sync read mode.

Timing includes quiet zones (tquiet1–tquiet3) before/after CONVST_QUAL and BUSY edges to preserve AC performance; acquisition time is 0.5 µs in normal mode and 0.8 µs in nap mode. The serial interface supports MSB-first transmission with SDO 3-state control via CS and PD.

Key Specifications

Pinout & Package

ADS8370IRHPT is housed in a 28-pin, 6 × 6 mm QFN package with exposed thermal pad requiring PCB soldering for thermal and mechanical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with ADS8371IRHPT, the ADS8370IRHPT offers lower system cost and simpler layout via integrated reference and pseudo-differential simplicity; versus ADS8380IPWR, it trades 2-bit resolution for reduced power and lower BOM count in cost-sensitive 16-bit applications.

Availability

ADS8370IRHPT is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, transducer interface, and high-accuracy data acquisition systems requiring stable component supply across industrial temperature ranges.

Supply support for ADS8370IRHPT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The ADS8370IRHPT belongs to TI's high-speed SAR ADC family designed for precision, low-power, and system-integration efficiency in portable and distributed measurement systems.

FAQ

What is the absolute maximum analog input voltage range for the ADS8370IRHPT?

The ADS8370IRHPT supports an absolute analog input voltage range of –0.2 V to V_REF + 0.2 V on +IN and –0.2 V to +0.2 V on –IN, with V_REF up to 4.2 V. Exceeding these limits risks permanent damage. The device's pseudo-differential architecture means –IN functions as a reference node, not a symmetrical input - proper decoupling of REFM to AGND is essential for accuracy. Always observe the absolute maximum ratings table in the SLAS450 datasheet.

How does the ADS8370IRHPT achieve zero latency, and what design impact does this have?

The ADS8370IRHPT achieves zero latency by outputting conversion results immediately upon BUSY falling edge - no pipeline registers delay data availability. This enables real-time feedback in closed-loop control systems such as motor current sensing or laser power regulation. For the ADS8370IRHPT, latency is effectively one conversion cycle (1.16 µs), allowing immediate use of sampled values without FIFO buffering or timing compensation in the host processor.

Can the ADS8370IRHPT operate with an external reference, and how does that affect its specifications?

Yes, the ADS8370IRHPT supports external reference via the REFIN pin, disabling the internal 4.096-V reference. When using an external source, gain error (±0.15%FS) and drift specs exclude internal reference contribution, improving overall system accuracy if a higher-stability reference is employed. However, external reference requires careful PCB layout (low-noise routing, dedicated ground, 0.1-µF + 1-µF decoupling) and increases component count - the ADS8370IRHPT's integrated reference remains optimal for space-constrained designs.

What are the timing constraints around the BUSY signal during data read operations?

For reliable data reads, the ADS8370IRHPT requires strict adherence to timing windows relative to BUSY: CS must fall ≥20 ns before BUSY fall (tsu2), and hold ≥15 ns after BUSY fall (th2); similarly, FS must fall ≥20 ns before BUSY fall (tsu3) and hold ≥15 ns after (th8). Violating these causes data corruption or missed samples. These constraints ensure the internal state machine correctly latches the conversion result before initiating serial transfer - critical for deterministic behavior in the ADS8370IRHPT.

Is the ADS8370IRHPT pin-compatible with other devices in the ADS83xx family, and which ones?

Yes, the ADS8370IRHPT is pin-compatible with the ADS8380 (18-bit) and ADS8371 (16-bit fully differential) in the same 28-pin RHP QFN package. This allows direct PCB footprint reuse when upgrading resolution or switching input topology. However, ADS8370IRHPT differs electrically: ADS8380 requires different timing margins for 18-bit reads, and ADS8371 lacks internal reference and uses differential input pins instead of pseudo-differential - firmware and reference circuitry must be verified per device.