Texas Instruments ADS8318IBDRCT

Overview

ADS8318IBDRCT from Texas Instruments is a 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with unipolar differential input range (–V_ref to +V_ref), SPI-compatible serial interface, and zero-latency operation at full speed. It operates from 2.048 V to 5.5 V external reference and delivers 95.2 dB SNR and ±1.0 LSB max INL, targeting precision data acquisition in space- and power-constrained systems.

For engineers reviewing the ADS8318IBDRCT datasheet, ADS8318IBDRCT pinout, ADS8318IBDRCT application, or ADS8318IBDRCT equivalent, key selection considerations include its 10-pin SON package, daisy-chain-capable SPI interface with optional busy indicator, low 18 mW typical power at 500 kSPS, and guaranteed monotonicity with no missing codes across its 16-bit resolution.

Technical Context

The ADS8318IBDRCT implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion at 500 kSPS. Its internal charge redistribution circuitry samples the differential input (+IN/–IN) on the rising edge of CONVST and completes conversion in a fixed 1400 ns using an internal clock - independent of SCLK timing.

Digital interface flexibility is achieved via mode selection at CONVST rising edge: SDI high enables CS mode (3- or 4-wire), while SDI low selects daisy-chain mode. The device supports both busy-indicator and non-busy configurations, and automatically enters power-down during acquisition, drawing only 50–300 nA typical current.

Key Specifications

Pinout & Package

ADS8318IBDRCT is housed in a 10-pin 3 mm × 3 mm SON (Small Outline No-Lead) package with wettable flanks, rated MSL2 per JSTD-020 and optimized for automated optical inspection (AOI) and thermal performance (θ_JA = 70 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8320IBDRCT and AD7682BRMZ-RL7, the ADS8318IBDRCT uniquely balances 500-kSPS throughput, ultra-low power, daisy-chain flexibility, and compact 10-pin SON packaging - making it optimal for multi-channel, battery-aware, space-constrained precision data acquisition.

Availability

ADS8318IBDRCT is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and medical vital sign monitoring requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for ADS8318IBDRCT 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS8318IBDRCT belongs to TI's precision SAR ADC product line, engineered specifically for low-power, high-accuracy data acquisition in battery-operated and thermally constrained applications where size, energy efficiency, and interface flexibility are critical.

FAQ

What is the maximum sampling rate supported by the ADS8318IBDRCT?

The ADS8318IBDRCT supports a maximum sampling rate of 500 kSPS, achieved with a fixed 1400 ns conversion time and 600 ns acquisition time. This rate is maintained across its full operating temperature range (–40°C to +85°C) and supply voltage range (+VA = 4.5 V to 5.5 V), ensuring deterministic timing for real-time control applications. The ADS8318IBDRCT does not support oversampling or variable-rate modes.

Does the ADS8318IBDRCT require an external reference voltage?

Yes, the ADS8318IBDRCT requires an external reference voltage applied to the REFIN pin. It accepts a reference range of 2.048 V to 5.5 V, and the full-scale differential input span is directly proportional to this reference (–V_ref to +V_ref). The ADS8318IBDRCT does not include an internal reference; proper decoupling with a 0.1 μF ceramic capacitor and 10 μF bulk capacitor to GND is mandatory for stable operation.

How does the daisy-chain interface mode work on the ADS8318IBDRCT?

The ADS8318IBDRCT enters daisy-chain mode when the SDI pin is low at the rising edge of CONVST. In this mode, multiple ADS8318IBDRCT devices can be connected serially: SDO of one device connects to SDI of the next, sharing SCLK and CONVST. A single 17-bit frame (busy bit + 16 data bits) clocks out all devices' results sequentially, reducing controller pin count and PCB routing complexity compared to parallel CS-based architectures.

What is the power consumption of the ADS8318IBDRCT during power-down?

The ADS8318IBDRCT draws 50–300 nA typical current during power-down, which occurs automatically during the acquisition phase between conversions. This ultra-low quiescent current is specified at +VA = 5 V and enables significant average power reduction in duty-cycled applications. The device exits power-down and resumes conversion upon the next CONVST rising edge, with no wake-up latency penalty.

Is the ADS8318IBDRCT pin-compatible with other devices in the ADS83xx family?

No, the ADS8318IBDRCT is not pin-compatible with other ADS83xx family members such as the ADS8320 or ADS8322. While all share the same 10-pin SON package outline, terminal assignments differ - notably, ADS8320 uses pin 1 for +IN and pin 3 for REFIN, whereas ADS8318IBDRCT assigns pin 1 to REFIN and pin 3 to +IN. PCB layout must be verified against the ADS8318IBDRCT-specific pinout diagram to avoid functional failure.