Texas Instruments ADS7888SDBVT

Overview

ADS7888SDBVT from Texas Instruments is an 8-bit, 1.25-MSPS successive approximation register (SAR) analog-to-digital converter with zero latency, unipolar input range (0 V to VDD), and 25-MHz serial interface. It operates from 2.35 V to 5.25 V, consumes 3.8 mW at 3-V supply, and features ±0.15 LSB INL and 49.5 dB SINAD - ideal for battery-powered sensor signal digitization in compact industrial interfaces.

For engineers reviewing the ADS7888SDBVT datasheet, ADS7888SDBVT pinout, ADS7888SDBVT application, or ADS7888SDBVT equivalent, key selection criteria include its 6-pin SOT-23 package, 1 µA power-down current, wide 15 MHz input bandwidth, and compatibility with microprocessor/DSP serial interfaces via CS/SCLK/SDO signaling without external glue logic.

Technical Context

The ADS7888SDBVT implements a capacitor-based SAR architecture with integrated sample-and-hold, sampling on the falling edge of CS and outputting 8-bit MSB-first data with 4 leading and 4 trailing zeros over a 16-clock cycle. Its conversion time is 450–480 ns at 25-MHz SCLK, and it supports asynchronous digital inputs up to 5.25 V regardless of VDD level - enabling mixed-voltage system interfacing.

It delivers guaranteed no-missing-codes performance across –40°C to 125°C, uses VDD as both supply and reference, and enters power-down mode when SCLK is inactive, drawing only 1 µA. The device avoids pipeline delay and offers true zero-latency operation suitable for real-time closed-loop control feedback paths.

Key Specifications

Pinout & Package

ADS7888SDBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with ADS7887SDBVT, the ADS7888SDBVT trades resolution for lower data volume and simpler firmware handling; compared with ADS7868IDBVR, it supports wider supply range and higher speed but consumes more power - making it optimal for 3.3 V/5 V industrial sensor nodes needing robustness and responsiveness.

Availability

ADS7888SDBVT is available at Aetrix Electronics and suitable for motor current sensing, optical sensor digitization, battery-powered instrumentation, and high-speed closed-loop control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS7888SDBVT 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 personal electronics markets.

The ADS7888SDBVT belongs to TI's precision SAR ADC product line, designed specifically for space- and power-constrained applications requiring fast, low-latency digitization of analog sensor signals without external reference or driver components.

FAQ

What is the maximum sampling rate supported by the ADS7888SDBVT?

The ADS7888SDBVT supports a maximum throughput rate of 1.25 MSPS, achieved with a 25-MHz SCLK input. This corresponds to a minimum conversion period of 800 ns, enabling real-time capture of signals with fundamental frequencies up to ~600 kHz while satisfying Nyquist criteria. The device maintains this rate across its full operating temperature range (–40°C to 125°C) and supply range (2.35 V to 5.25 V).

Does the ADS7888SDBVT require an external reference voltage?

No, the ADS7888SDBVT does not require an external reference voltage. It uses the VDD supply rail as its internal reference, establishing a unipolar input range from 0 V to VDD. This simplifies system design by eliminating external reference components and associated layout complexity, while maintaining guaranteed linearity (±0.15 LSB INL) and monotonicity across temperature and supply variations.

How does the power-down mode function on the ADS7888SDBVT?

The ADS7888SDBVT enters power-down mode automatically when the SCLK signal is inactive (held static), reducing supply current to 1 µA. Power-down is exited on the first SCLK edge after CS assertion, with a 0.8 µs power-up time and one invalid conversion cycle. This behavior enables ultra-low average power in burst-mode acquisition systems - for example, waking every 100 ms to take 10 samples yields <10 µA average current when using ADS7888SDBVT.

Can the ADS7888SDBVT interface directly with a 5-V microcontroller while operating from a 3.3-V supply?

Yes, the ADS7888SDBVT supports mixed-voltage operation: its digital inputs (CS and SCLK) tolerate voltages up to 5.25 V regardless of VDD level. So when powered from 3.3 V, it can accept 5-V logic signals from legacy microcontrollers without level-shifting circuitry. However, its SDO output remains referenced to VDD (3.3 V), requiring level translation if driving a 5-V input - a detail confirmed in the ADS7888SDBVT electrical characteristics table under VIH/VIL specifications.

What package type is used for the ADS7888SDBVT, and is it RoHS compliant?

The ADS7888SDBVT is packaged in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with lead finish NiPdAu and RoHS-compliant materials. This package supports standard reflow soldering profiles and is rated for operation from –40°C to 125°C. TI's official packaging documentation confirms that the DBV variant of ADS7888SDBVT meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is fully RoHS and REACH compliant.