Texas Instruments ADS7885SDBVT

Overview

ADS7885SDBVT from Texas Instruments is an 8-bit, 3-MSPS micro-power SAR analog-to-digital converter in a 6-pin SOT-23 package. It features zero latency, 48-MHz serial interface, ±0.15 LSB INL, 49.8 dB SINAD at 100 kHz, and operates from 2.7 V to 5.5 V supply - ideal for high-speed motor current sensing in digital drives.

For engineers reviewing the ADS7885SDBVT datasheet, ADS7885SDBVT pinout, ADS7885SDBVT application, or ADS7885SDBVT equivalent, key selection criteria include unipolar input range (0 V to VDD), 1 µA powerdown current, 30 MHz full-power bandwidth, and CMOS-compatible digital I/O with 5.5 V-tolerant inputs independent of VDD.

Technical Context

The ADS7885SDBVT implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold. Conversion is initiated on the falling edge of CS, and data is output serially MSB-first over SDO using a 16-clock frame containing two leading zeros, eight data bits, and six trailing zeros.

Its digital interface supports glueless connection to microprocessors and DSPs via CS and SCLK. Input voltage tolerance up to 5.5 V - regardless of VDD level - enables interoperability across mixed-supply systems and simplifies power-up sequencing.

Key Specifications

Pinout & Package

ADS7885SDBVT is housed in a 6-pin SOT-23 package (DBV), measuring 2.9 mm × 1.6 mm × 1.0 mm, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7886SDBVT and ADS7888SDBVT, the ADS7885SDBVT offers the lowest INL (±0.15 LSB) and best SINAD (49.8 dB) among TI's 8-bit 3-MSPS SOT-23 SAR converters, making it optimal for precision current/voltage monitoring where linearity dominates over raw resolution.

Availability

ADS7885SDBVT is available at Aetrix Electronics and suitable for motor current sensing, optical sensor interfacing, and portable medical instrumentation requiring stable component supply across automotive and industrial temperature ranges.

Supply support for ADS7885SDBVT 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.

The ADS7885SDBVT belongs to TI's micro-power miniature SAR converter family, designed for space-constrained, battery-sensitive applications demanding high throughput without sacrificing DC accuracy or supply flexibility.

FAQ

What is the maximum sample rate supported by the ADS7885SDBVT?

The ADS7885SDBVT supports a maximum throughput rate of 3 MSPS when operated with a 48-MHz SCLK and VDD between 3.6 V and 5.5 V. At lower supply voltages (2.7 V to 3.6 V), the maximum rate is 2.5 MSPS. This rate is sustained without pipeline delay due to its zero-latency SAR architecture, and each conversion completes within 198 ns at 5 V.

Does the ADS7885SDBVT require an external reference voltage?

No, the ADS7885SDBVT uses its VDD supply as the internal reference, establishing a unipolar input range of 0 V to VDD. This eliminates the need for external references or precision voltage dividers, reducing BOM count and board area - a key advantage in cost- and space-sensitive applications like digital drive current sensing.

How does the 5.5 V-tolerant digital input feature benefit system design?

The ADS7885SDBVT allows digital inputs (CS, SCLK) to swing up to 5.5 V regardless of VDD level - e.g., CS can be driven from a 5-V microcontroller while VDD is 2.7 V. This relaxes power sequencing constraints and removes the need for level translators, simplifying interconnect in mixed-voltage systems such as industrial PLCs with legacy 5-V logic and modern low-voltage analog sections.

What is the power consumption of the ADS7885SDBVT in normal operation?

At VDD = 3.0 V and 2.5-MSPS throughput, the ADS7885SDBVT draws 2.25–3.0 mA (typical 2.6 mA); at VDD = 5.0 V and 3-MSPS throughput, it draws 3–4 mA (typical 3.5 mA). In static mode (SCLK inactive), current drops to 1.8–2.0 mA at 3 V and 2.0–2.5 mA at 5 V. Power dissipation is 6.8 mW at 3 V/2.5 MSPS and 15 mW at 5 V/3 MSPS.

Can the ADS7885SDBVT interface directly with a microcontroller SPI port?

Yes - the ADS7885SDBVT uses a standard 3-wire serial interface (CS, SCLK, SDO) compatible with most MCU SPI peripherals configured in master mode with CPOL = 0 and CPHA = 0. Data is MSB-first, 16-clock frames contain two leading zeros and six trailing zeros, and SDO enters 3-state when CS goes high - matching common SPI timing expectations without additional glue logic.