Texas Instruments TLV1548QDBRQ1

Overview

TLV1548QDBRQ1 from Texas Instruments is an automotive-qualified 10-bit SAR analog-to-digital converter with 8-channel analog multiplexer, SPI/QSPI-compatible serial interface, and asynchronous sampling control via CSTART. It operates from 2.7 V to 5.5 V, achieves ≤10 µs conversion time, and supports programmable power-down (1 µA) for battery-sensitive vehicle subsystems such as body control modules and sensor hubs.

For engineers reviewing the TLV1548QDBRQ1 datasheet, TLV1548QDBRQ1 pinout, TLV1548QDBRQ1 application, or TLV1548QDBRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, extended sampling flexibility via CSTART, dual-mode (microprocessor/DSP) serial timing, ratiometric reference architecture, and guaranteed operation across −40°C to +125°C.

Technical Context

The TLV1548QDBRQ1 implements a switched-capacitor successive-approximation ADC core with built-in sample-and-hold, differential high-impedance reference inputs (REF+/REF−), and an 11-channel analog multiplexer selecting among eight external analog inputs or three internal self-test voltages. Its conversion logic is synchronized to I/O CLK with mode detection via FS pin state at CS falling edge.

It supports two serial interface modes: microprocessor mode (FS = VCC) uses rising/falling edges of I/O CLK for data input depending on INV CLK state, while DSP mode (FS driven by TMS320) uses inverted edge alignment and frame-sync–triggered transfers. Conversion rate (fast: ≤10 µs; slow: ≤40 µs) and power-down state are software-programmed via 4-bit DATA IN command.

Key Specifications

Pinout & Package

TLV1548QDBRQ1 is housed in a 20-pin SSOP (DB) package with 0.65 mm pitch, optimized for thermal performance and PCB space efficiency in automotive control units.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1548QDBRQ1, ADS7953QDBTQ1 offers greater resolution and channel density but sacrifices flexible sampling control and dual-interface timing; MAX11131AUT+T provides compact 12-bit conversion at lower voltage but cannot replace TLV1548QDBRQ1 in AEC-Q100–mandated designs due to missing qualification and temperature range.

Availability

TLV1548QDBRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, engine control units, ADAS power monitoring, and electric power steering systems requiring stable component supply with long-term lifecycle assurance.

Supply support for TLV1548QDBRQ1 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 automotive-grade ICs, with decades of experience in high-reliability signal chain solutions.

The TLV1548QDBRQ1 belongs to TI's automotive-qualified data acquisition portfolio, designed specifically for cost-sensitive, space-constrained vehicle subsystems needing robust 10-bit digitization with flexible timing and low-power operation.

FAQ

What is the maximum I/O CLK frequency supported by TLV1548QDBRQ1?

The TLV1548QDBRQ1 supports up to 10 MHz I/O CLK at VCC ≥ 4.5 V with input source impedance ≤100 Ω. At 2.7 V supply, maximum I/O CLK drops to 2.39 MHz for 1 kΩ source impedance. These limits are defined by internal timing margins and charge redistribution dynamics of the SAR capacitor array - exceeding them risks conversion errors or missed EOC assertion.

How does the CSTART pin affect sampling behavior in TLV1548QDBRQ1?

In TLV1548QDBRQ1, the CSTART pin enables asynchronous sampling: its falling edge initiates acquisition, and its low duration directly sets the sampling time (tACQ). This decouples sampling from I/O CLK timing, allowing precise control over aperture time for high-impedance sensors. When CSTART is held high, the device defaults to fixed 6-clock-cycle sampling synchronized to I/O CLK.

Is TLV1548QDBRQ1 compatible with both microcontrollers and TMS320 DSPs?

Yes, TLV1548QDBRQ1 supports dual serial interface modes. Microprocessor mode (FS = VCC) uses standard SPI/QSPI timing with DATA IN sampled on rising/falling I/O CLK edges per INV CLK state. DSP mode (FS driven by TMS320) uses frame-sync–triggered transfers with inverted edge alignment and 16-clock cycles - enabling seamless integration into TI C2000 and C6000-based motor control platforms.

What self-test functions are available in TLV1548QDBRQ1?

TLV1548QDBRQ1 provides three internal self-test voltages selectable via DATA IN commands: (VREF+ − VREF−)/2 yields output 0x200, VREF− yields 0x000, and VREF+ yields 0x3FF. These allow verification of ADC linearity, reference integrity, and digital data path without external test equipment - critical for ISO 26262-compliant diagnostic routines in ASIL-B systems.

Does TLV1548QDBRQ1 require external components for basic operation?

No, TLV1548QDBRQ1 operates autonomously with only VCC, GND, REF+, REF−, and serial interface connections. Its built-in sample-and-hold, reference buffer, and clock generation eliminate need for external op-amps, references, or timing ICs. A 0.1 µF bypass capacitor on VCC is recommended, but no external passive filtering or amplification is required for nominal 1 kΩ source impedance inputs.