Texas Instruments TLV1549IDR

Overview

TLV1549IDR from Texas Instruments is a 10-bit successive-approximation analog-to-digital converter (ADC) with integrated sample-and-hold, 3.3-V single-supply operation, ±1 LSB total unadjusted error, and a three-wire serial interface (CS, I/O CLOCK, DATA OUT). It supports ratiometric conversion via differential reference inputs (REF+, REF–) and is used in industrial sensor signal conditioning where low-power, compact ADCs interface directly to microcontrollers.

For engineers reviewing the TLV1549IDR datasheet, TLV1549IDR pinout, TLV1549IDR application, or TLV1549IDR equivalent, this page delivers verified technical context, exact pin functions for the SOIC-8 package, real-world timing modes (10- to 16-clock transfers), and validated alternative parts for legacy 3.3-V data acquisition designs.

Technical Context

The TLV1549IDR implements a switched-capacitor SAR architecture with an on-chip system clock, enabling automatic sampling starting on the third I/O CLOCK falling edge and holding on the tenth. Its differential high-impedance reference inputs (REF+, REF–) support ratiometric scaling and isolation from supply noise.

It operates exclusively in serial mode with three control signals: chip select (CS) resets internal logic and enables output drivers; I/O CLOCK controls sampling duration and bit-shift timing; DATA OUT delivers 10-bit results in MSB-first order with 3-state drive capability. Six defined timing modes accommodate host processor clock flexibility and CS assertion strategies.

Key Specifications

Pinout & Package

TLV1549IDR is supplied in an 8-pin SOIC (D) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliance. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1549IDR, TLC1549CDR offers identical functionality but requires 5-V operation, limiting compatibility with modern low-voltage systems; ADS7822U provides higher resolution and speed at increased cost and design complexity-neither is pin-compatible, and both demand layout or firmware updates.

Availability

TLV1549IDR is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, motor drive current sensing, and medical vital sign monitors requiring stable component supply across extended temperature ranges.

Supply support for TLV1549IDR 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 industrial-grade ICs.

The TLV1549IDR belongs to TI's legacy low-power serial ADC product line, designed specifically for cost-sensitive, space-constrained 3.3-V data acquisition systems requiring guaranteed accuracy without calibration.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLV1549IDR?

The TLV1549IDR supports an I/O CLOCK frequency up to 2.1 MHz under recommended operating conditions (VCC = 3.0–3.6 V, TA = –40°C to +85°C). Exceeding this limit may cause timing violations, incomplete sampling, or corrupted DATA OUT bits. The device requires minimum high/low pulse widths of 190 ns each and transition times ≤1 μs for reliable operation.

Does the TLV1549IDR require an external reference voltage?

The TLV1549IDR does not require an external reference - it operates ratiometrically using VCC as REF+ and GND as REF–, delivering full-scale output when ANALOG IN = VCC. However, external precision references can be applied to REF+ and REF– to improve absolute accuracy, provided VREF+ – VREF– remains within 2.5 V to VCC+0.2 V per datasheet limits.

Can the TLV1549IDR interface directly with a 3.3-V microcontroller SPI port?

Yes, the TLV1549IDR interfaces directly with 3.3-V microcontrollers using its native three-wire serial protocol. While not SPI-standard compliant (no dedicated MOSI/MISO lines), it maps CS to slave select, I/O CLOCK to SCLK, and DATA OUT to MISO - requiring only software-driven bit-banging or minimal SPI peripheral configuration for clock polarity/phase alignment.

What is the purpose of the 10th I/O CLOCK falling edge in TLV1549IDR timing?

On the 10th I/O CLOCK falling edge, the TLV1549IDR completes analog sampling, finalizes the 10-bit conversion result, and drives DATA OUT low to ensure all subsequent bits (beyond the 10th) read as zero during extended clock sequences. This guarantees deterministic 10-bit output regardless of whether the host sends 10, 11, or up to 16 clocks per transfer.

Is the TLV1549IDR pin-compatible with the TLC1549 series?

Yes, the TLV1549IDR is terminal-compatible with the TLC1549 and TLC1549x families in the same SOIC-8 (D) package - sharing identical pinout, signal names, and functional behavior. However, the TLV1549IDR is rated for 3.3-V operation only, while TLC1549 variants require 5-V supply; mixing them without voltage adaptation risks damage or malfunction.