Texas Instruments ADS7885SDBVR

Overview

ADS7885SDBVR 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, ±0.15 LSB INL, 49.8 dB SINAD at 100 kHz, 48-MHz serial interface, and operates from 2.7 V to 5.5 V supply - enabling high-speed, low-power sampling in battery-powered motor current sensing and optical sensor interfaces.

For engineers reviewing the ADS7885SDBVR datasheet, ADS7885SDBVR pinout, ADS7885SDBVR application, or ADS7885SDBVR equivalent, key selection criteria include its 3-MSPS throughput with 198 ns conversion time at 5 V, unipolar 0–VDD input range, 1 µA powerdown current, and digital input tolerance up to 5.5 V independent of VDD - critical for mixed-supply system interfacing.

Technical Context

The ADS7885SDBVR implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold. Conversion is initiated on the falling edge of CS, and data is output MSB-first over a 16-clock frame containing two leading zeros, eight data bits, and six trailing zeros.

Its serial interface uses CMOS-level CS and SCLK signals for glueless connection to microcontrollers and DSPs. Digital inputs tolerate up to 5.5 V regardless of VDD (2.7–5.5 V), relaxing power-up sequencing constraints and enabling interoperability with higher-voltage logic domains.

Key Specifications

Pinout & Package

ADS7885SDBVR 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 ADS7886SDBVR and ADS7888SDBVR, the ADS7885SDBVR uniquely balances 3-MSPS throughput, 8-bit linearity (±0.15 LSB INL), and ultra-low power (1 µA powerdown) in the smallest SOT-23 footprint - making it optimal for high-dynamic-response, battery-limited systems.

Availability

ADS7885SDBVR is available at Aetrix Electronics and suitable for motor current sensing, optical networking interfaces, and battery-powered instrumentation requiring stable component supply, long-term manufacturability, and guaranteed traceability.

Supply support for ADS7885SDBVR 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 low-power design.

The ADS7885SDBVR belongs to TI's micro-power miniature SAR converter family, engineered for high-speed, low-energy digitization in space-constrained, thermally demanding applications such as motor drives and portable medical devices.

FAQ

What is the maximum sample rate supported by the ADS7885SDBVR?

The ADS7885SDBVR 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 (2.7–3.6 V), the maximum rate is 2.5 MSPS. This is confirmed in the device's timing specifications and dynamic performance tables under TA = –40°C to 125°C conditions.

Does the ADS7885SDBVR require an external reference voltage?

No, the ADS7885SDBVR does not require an external reference. Its internal reference is derived directly from the VDD supply, establishing a unipolar input range of 0 V to VDD. This simplifies design by eliminating external reference components while maintaining ±0.15 LSB INL across temperature and supply variations.

Can the ADS7885SDBVR interface with a 5-V microcontroller while powered from a 3-V supply?

Yes - the ADS7885SDBVR accepts digital input voltages up to 5.5 V regardless of VDD level. When powered from 3 V, its CS and SCLK pins tolerate 5-V logic signals, enabling seamless interfacing with higher-voltage controllers without level shifters. Output levels (SDO) remain referenced to VDD (3 V), per VOH/VOL specs.

What is the conversion time of the ADS7885SDBVR at 5 V supply?

At VDD = 5 V and 48-MHz SCLK, the ADS7885SDBVR has a typical conversion time of 198 ns, calculated as 9.5 × t_SCLK. This value is explicitly specified in the ADS7885 timing requirements table and enables sub-microsecond latency in time-critical acquisition tasks.

How does the powerdown mode function on the ADS7885SDBVR?

The ADS7885SDBVR enters powerdown mode when CS is pulled high between the 2nd and 10th SCLK falling edges of a conversion frame. Power consumption drops to 1 µA, and SDO enters 3-state. Recovery requires a dummy cycle (>10 SCLK edges) and takes 0.8 µs - documented in Figure 3 and Figure 4 of the SLAS567 datasheet.