Texas Instruments ADS7886SDCKR

Overview

ADS7886SDCKR from Texas Instruments is a 12-bit, 1-MSPS successive approximation register (SAR) analog-to-digital converter with integrated sample-and-hold, unipolar 0 V to VDD input range, 20-MHz serial interface, and micro-power operation (3.9 mW at 3 V). It delivers ±1.25 LSB INL max and 72.25-dB SINAD in battery-powered data acquisition systems.

For engineers reviewing the ADS7886SDCKR datasheet, ADS7886SDCKR pinout, ADS7886SDCKR application, or ADS7886SDCKR equivalent, this page provides verified electrical specs, SC70-6 package mapping, functional mode timing, power-down behavior, and real-world implementation constraints for high-speed, low-power signal digitization.

Technical Context

The ADS7886SDCKR implements a capacitor-based SAR architecture with inherent sample-and-hold, initiating conversion on the falling edge of CS and outputting 12-bit MSB-first data over a 3-wire SPI-compatible interface (CS, SCLK, SDO). Its zero-latency design ensures no pipeline delay between sampling and first valid output.

It supports wide supply operation (2.35 V to 5.25 V), features digital input tolerance up to 5.25 V independent of VDD, and enters power-down mode when CS goes high between the 2nd and 10th SCLK falling edges-reducing supply current to 1 µA.

Key Specifications

Pinout & Package

The ADS7886SDCKR is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body size), optimized for space-constrained PCB layouts and thermal performance (R_θJA = 149.6 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7886SDCKR, ADS7887SDCKR trades resolution for lower cost and power, while ADS8860IDRCT delivers four additional bits at the expense of size, power, and system integration effort-making ADS7886SDCKR optimal for space- and energy-constrained 12-bit applications.

Availability

ADS7886SDCKR is available at Aetrix Electronics and suitable for motor current sensing, optical sensor interfaces, battery-powered data acquisition, medical instrumentation, and high-speed closed-loop systems requiring stable component supply and guaranteed long-term sourcing.

Supply support for ADS7886SDCKR 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 ADS7886SDCKR belongs to TI's micro-power miniature SAR ADC family, engineered for ultra-low-power, high-speed digitization in space-constrained, battery-operated, and thermally demanding applications.

FAQ

What is the maximum input frequency the ADS7886SDCKR can accurately digitize?

The ADS7886SDCKR has a full-power bandwidth of 15 MHz at –3 dB, meaning it maintains specified AC performance (e.g., 72.25-dB SINAD) for input signals up to 15 MHz. For best results at 100 kHz, it achieves 72.25-dB SINAD and –84-dB THD per the datasheet. The device's 1-MSPS throughput and 325-ns acquisition time support accurate sampling of fast transients within this bandwidth. ADS7886SDCKR is validated for use in optical networking and motor control where such bandwidth is essential.

Does the ADS7886SDCKR require an external reference voltage?

No, the ADS7886SDCKR uses its VDD supply as the internal reference-its unipolar input range is 0 V to VDD, eliminating the need for external references or voltage dividers. This simplifies design and reduces BOM count. However, VDD must be low-noise and well-decoupled (1-µF + 10-nF capacitors near pins) to maintain 72.25-dB SINAD. ADS7886SDCKR's reference is inherently ratiometric, so accuracy depends directly on VDD stability and cleanliness.

How does the power-down mode function on the ADS7886SDCKR?

The ADS7886SDCKR enters power-down mode when CS is pulled high between the 2nd and 10th falling edges of SCLK-reducing supply current to 1 µA. A dummy cycle (CS low ≥10 SCLK edges) exits power-down, with full functionality restored in 1 µs. This mode is ideal for duty-cycled sensing in battery-powered systems. ADS7886SDCKR's precise timing window prevents accidental entry, and its 1-µA quiescent current enables multi-year operation on small batteries.

Can the ADS7886SDCKR interface with a 5-V microcontroller while operating from a 2.35-V supply?

Yes-the ADS7886SDCKR accepts digital inputs up to 5.25 V regardless of VDD, so a 5-V MCU can drive CS and SCLK directly without level shifters. However, SDO output levels (VOH/VOL) are referenced to VDD, so a 2.35-V ADS7886SDCKR outputs ~2.15 V for VOH-requiring either a 2.35-V–compatible MCU input or a simple level translator on SDO. This dual-voltage tolerance simplifies mixed-rail system integration.

What is the recommended PCB layout practice for the ADS7886SDCKR?

Place 1-µF and 10-nF decoupling capacitors as close as possible to VDD and GND pins using short, wide traces; separate analog and digital ground planes with single-point connection near the ADC; route VIN with minimal stub length and guard ring; avoid routing digital traces under the SC70-6 body. These practices preserve the ADS7886SDCKR's 72.25-dB SINAD and prevent coupling-induced INL degradation. Thermal vias under the exposed pad (if present in variant) improve R_θJA, though ADS7886SDCKR uses standard SC70-6 without thermal pad.