Texas Instruments ADC081S051CISD/NOPB

Overview

ADC081S051CISD/NOPB from Texas Instruments is a single-channel, 8-bit successive-approximation ADC with SPI/QSPI/MICROWIRE/DSP-compatible serial interface, operating at 200–500 ksps sample rates, 2.7V–5.25V supply, and delivering 49.6 dB SNR (typ) and ±0.06 LSB INL (typ). It serves as a low-power analog front-end for sensor signal digitization in portable instrumentation.

For engineers reviewing the ADC081S051CISD/NOPB datasheet, ADC081S051CISD/NOPB pinout, ADC081S051CISD/NOPB application, or ADC081S051CISD/NOPB equivalent, key selection criteria include guaranteed no missing codes over industrial temperature (−40°C to +85°C), 350 ns minimum acquisition time, tri-state SDATA output timing, and WSON-6/SOT-23-6 package compatibility with space-constrained embedded designs.

Technical Context

The ADC081S051CISD/NOPB implements a charge-redistribution DAC core with internal track-and-hold, enabling precise sampling of DC and AC signals up to 100 kHz input frequency. Its conversion sequence is initiated by CS falling edge, followed by 16 SCLK cycles to output three leading zeros, eight MSB-first data bits, and four trailing zeros.

It supports variable power management via CS-controlled shutdown mode, reducing supply current to 500 nA (typ) at +5.25V, and operates across full industrial temperature range with guaranteed performance at 200–500 ksps - not just at a single rate. The straight-binary output format and rail-to-rail input range (0 V to VA) simplify interface with microcontrollers and DSPs.

Key Specifications

Pinout & Package

ADC081S051CISD/NOPB is packaged in a 6-lead WSON (3 mm × 3 mm, 0.65 mm pitch) with exposed thermal pad, also available in SOT-23-6. The center pad (Pin 7, GND) must be soldered to PCB ground for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADC081S021CISD/NOPB and ADC081S101CISD/NOPB, the ADC081S051CISD/NOPB provides optimal balance of throughput (200–500 ksps), power (1.6 mW), and noise performance (49.6 dB SNR) for mid-speed industrial sensing - avoiding overdesign or underperformance in typical embedded data acquisition roles.

Availability

ADC081S051CISD/NOPB is available at Aetrix Electronics and suitable for portable systems, remote data acquisition, instrumentation and control systems requiring stable component supply and long-term manufacturability.

Supply support for ADC081S051CISD/NOPB 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and consumer markets with high-reliability components.

The ADC081S051CISD/NOPB belongs to TI's precision SAR ADC product line, designed specifically for cost-sensitive, space-constrained applications demanding guaranteed performance across wide sample rate ranges and industrial temperatures.

FAQ

What is the absolute maximum analog input voltage for ADC081S051CISD/NOPB?

The absolute maximum analog input voltage for ADC081S051CISD/NOPB is VA + 0.3 V, and the minimum is −0.3 V relative to GND. Exceeding these limits risks forward-biasing internal ESD diodes, causing erratic behavior or damage. The functional input range remains 0 V to VA, as specified in the operating ratings.

Does ADC081S051CISD/NOPB require an external reference voltage?

No, ADC081S051CISD/NOPB uses its VA supply pin as the reference voltage - the full-scale range is 0 V to VA. This eliminates the need for an external reference, simplifying layout and reducing BOM count. However, supply noise directly impacts accuracy, so proper decoupling (1 µF + 0.1 µF) is mandatory.

Can ADC081S051CISD/NOPB interface directly with a 1.8V microcontroller?

Yes - the digital inputs (CS, SCLK) tolerate voltages up to 5.25 V regardless of VA, and SDATA output swings rail-to-rail (0 V to VA). When VA = 3.3 V, SDATA is 3.3 V logic; for 1.8 V MCU compatibility, operate ADC081S051CISD/NOPB at VA = 1.8 V (within 2.7 V min limit) or use level-shifting on SDATA only if required by receiver thresholds.

How does the shutdown mode of ADC081S051CISD/NOPB reduce power consumption?

When CS is held high, ADC081S051CISD/NOPB enters shutdown mode, reducing supply current to 500 nA (typ) at +5.25 V. This cuts normal-mode power (8.5 mW) by >99.9%, enabling µW-level standby in battery-powered systems. Recovery time from shutdown is 1 µs, allowing rapid reactivation for burst-mode sampling.

What is the purpose of the three leading zeros and four trailing zeros in ADC081S051CISD/NOPB's serial output format?

The three leading zeros and four trailing zeros in ADC081S051CISD/NOPB's SDATA stream provide frame synchronization and timing margin. They ensure consistent 16-clock-cycle framing (3+8+4+1 dummy bit), allow receiver setup/hold time alignment, and prevent misreads due to clock skew or metastability - especially critical in noisy industrial environments.