Texas Instruments ADS7867IDBVR

Overview

ADS7867IDBVR from Texas Instruments is a 10-bit, 240-KSPS micro-power SAR analog-to-digital converter with SPI-compatible serial interface, single-supply operation (1.2 V to 3.6 V), ±0.5 LSB integral nonlinearity, and 6-pin SOT-23 package - used for precision signal acquisition in battery-powered medical sensors and portable data loggers.

For engineers reviewing the ADS7867IDBVR datasheet, ADS7867IDBVR pinout, ADS7867IDBVR application, or ADS7867IDBVR equivalent, this page delivers verified electrical specifications, real-world timing behavior at 1.2 V/1.6 V supply, SDO output synchronization logic, and validated alternative options for low-voltage, miniature ADC selection.

Technical Context

The ADS7867IDBVR implements a charge redistribution SAR architecture with integrated sample-and-hold, deriving its reference internally from VDD to support 0 V to VDD unipolar input range. Conversion is initiated on the falling edge of CS, and data is clocked out MSB-first on SDO using SCLK as both conversion clock and serial shift clock.

It uses 11 SCLK cycles per conversion at 3.4 MHz (1.6–3.6 V) or 1.7 MHz (1.2–1.6 V), achieving 240 KSPS or 120 KSPS throughput respectively. Auto power-down reduces current to 8 nA between conversions, enabling ultra-low average power in duty-cycled systems.

Key Specifications

Pinout & Package

ADS7867IDBVR is housed in a 6-pin SOT-23 package (DBV) with exposed pad not electrically connected. Pin 1 is REF/VDD; pin 2 is GND; pin 3 is VIN; pin 4 is SCLK; pin 5 is SDO; pin 6 is CS. All pins are CMOS-compatible with rail-to-rail input thresholds scaling with VDD.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS7867IDBVR, ADS7887IDBVR offers higher speed and resolution but cannot operate below 2.35 V, while MCP3201-E/MS provides 12-bit accuracy in SOIC-8 but doubles board area and excludes ultra-low-voltage use cases - making ADS7867IDBVR uniquely suited for miniature, battery-constrained 10-bit applications.

Availability

ADS7867IDBVR is available at Aetrix Electronics and suitable for battery-powered medical instruments, isolated industrial sensors, portable gas detectors, and smart energy meter sensor interfaces requiring stable component supply across long production lifecycles.

Supply support for ADS7867IDBVR 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 and embedded processing technologies, with over 50 years of innovation in precision data converters and low-power signal chain solutions.

The ADS786x family was designed specifically for ultra-low-voltage, miniature SAR ADC applications in portable and energy-constrained systems - emphasizing single-supply simplicity, internal reference integration, and sub-1-µA quiescent power.

FAQ

What is the minimum supply voltage required for guaranteed operation of the ADS7867IDBVR?

The ADS7867IDBVR is fully specified from 1.2 V to 3.6 V. At 1.2 V, it delivers 120 KSPS throughput with 1.7 MHz SCLK and maintains ±0.5 LSB INL across –40°C to +85°C. Operation below 1.2 V is not characterized and may result in missing codes or timing violations.

Does the ADS7867IDBVR require an external reference voltage?

No. The ADS7867IDBVR uses an internal reference derived from VDD, setting its full-scale input range to 0 V to VDD. This eliminates the need for external reference components, reducing BOM count and PCB area - a key advantage in space- and cost-sensitive designs.

How many clock cycles does the ADS7867IDBVR require per conversion, and how is timing affected by supply voltage?

The ADS7867IDBVR requires exactly 11 SCLK cycles per conversion. At VDD ≥1.6 V, maximum SCLK is 3.4 MHz (240 KSPS); at 1.2 V ≤ VDD < 1.6 V, maximum SCLK is 1.7 MHz (120 KSPS). Minimum SCLK period is determined by acquisition time (0.64 µs at ≥1.6 V).

What is the function of the SDO pin during and after conversion on the ADS7867IDBVR?

SDO on the ADS7867IDBVR outputs 10-bit straight-binary data MSB-first, beginning one SCLK cycle after CS falls. After the 10th bit, SDO enters high-impedance state within 60 ns (tDIS). No trailing zeros or framing bits are added - the output is strictly 10 valid bits per CS assertion.

Can the ADS7867IDBVR be used in a daisy-chain SPI configuration with multiple devices?

No. The ADS7867IDBVR has a single SDO output with no SDO-in or daisy-chain enable feature. It supports only point-to-point SPI connections. For multi-channel systems, separate CS lines or external multiplexing are required - confirmed by TI's SLAS465 timing diagrams and terminal function table.