Texas Instruments TLC5540INSR

Overview

TLC5540INSR from Texas Instruments is a high-speed, 8-bit analog-to-digital converter (ADC) using a modified semi-flash architecture to achieve up to 40 MSPS conversion rate with ±0.3 LSB typical differential linearity and 75 MHz analog input bandwidth. It operates from a single 5-V supply, integrates internal reference voltage generators for 2-V full-scale operation, and features output enable (OE) for high-impedance digital outputs - ideal for undersampling in digital TV front ends.

For engineers reviewing the TLC5540INSR datasheet, TLC5540INSR pinout, TLC5540INSR application, or TLC5540INSR equivalent, key selection considerations include its industrial temperature range (−40°C to +85°C), SOP-24 package, 40 MSPS maximum sampling rate, and compatibility with quadrature demodulation signal chains requiring low aperture jitter (30 ps) and high ENOB at IF frequencies.

Technical Context

The TLC5540INSR employs a time-interleaved semi-flash architecture with separate upper and lower comparator blocks: the four MSBs are generated on each clock's falling edge, while the four LSBs alternate between two lower comparator banks on successive clock cycles - doubling effective sampling time per LSB block and enabling 40 MSPS without increasing comparator count. This architecture reduces power versus full-flash designs while maintaining speed.

It supports flexible reference configuration via REFT/REFB and REFBS/REFTS terminals, allowing either externally driven references or internal resistor-divider biasing (e.g., 2.63 V top / 0.61 V bottom for 2.02 V full-scale). Analog input uses chopper-stabilized sampling with <100 Ω recommended source impedance, and digital outputs are CMOS-compatible with programmable high-impedance state controlled by OE.

Key Specifications

Pinout & Package

SOP-24 (NS) package: 300-mil wide body, 1.27 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited floor life), rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS820U and MAX1186ECM+, the TLC5540INSR uniquely combines internal 2-V reference generation, OE-controlled tri-state outputs, and industrial-grade temperature rating in SOP-24 - making it optimal for cost-sensitive, high-volume video and communications front ends requiring minimal external components and robust layout tolerance.

Availability

TLC5540INSR is available at Aetrix Electronics and suitable for digital television front ends, QAM demodulators, CCD scanner interfaces, and digital set-top box designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC5540INSR 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 high-performance signal chain solutions, with decades of expertise in data converters and interface ICs.

The TLC5540INSR belongs to TI's high-speed precision ADC product line, engineered specifically for cost-sensitive, high-bandwidth applications in broadcast video, communications infrastructure, and industrial imaging where 8-bit resolution and 40 MSPS throughput deliver optimal balance of speed, accuracy, and power efficiency.

FAQ

What is the operating temperature range for the TLC5540INSR?

The TLC5540INSR is rated for industrial operation from −40°C to +85°C. This specification is confirmed in the "Recommended Operating Conditions" table (page 4) and "Package Option Addendum" (page 11), where TLC5540INSR is explicitly listed under the TLC5540I grade. The device undergoes qualification testing across this full range, ensuring parameter stability including ENOB, SNR, and DNL.

Does the TLC5540INSR require an external reference voltage?

No - the TLC5540INSR includes internal resistors (320 Ω / 270 Ω / 80 Ω) to generate nominal 2.63 V (REFT) and 0.61 V (REFB) from VDDA, yielding a 2.02 V full-scale range. As shown in Figure 14 and Table 1, connecting REFT to REFTS and REFB to REFBS enables this self-bias mode, eliminating external reference components for many video and comms applications.

What package type and dimensions does the TLC5540INSR use?

The TLC5540INSR uses the SOP-24 (NS) package: 300-mil body width, 1.27 mm lead pitch, 7.9 mm × 4.5 mm footprint, and 1.2 mm max height. Package drawings (PW0024A) and tape-and-reel data (2000 pcs/reel, 24.4 mm reel width, Q1 pin-1 quadrant) are documented in TI's Package Materials Information (pages 10–11).

How does the TLC5540INSR achieve 40 MSPS with low power consumption?

The TLC5540INSR achieves 40 MSPS at just 85 mW via its modified semi-flash architecture: upper and lower comparator blocks operate interleaved across three clock phases, reducing total comparator count by ~30% versus conventional semi-flash. This minimizes dynamic current while maintaining speed - verified by power vs. sampling frequency curves (Figure 3) showing 85 mW at 40 MSPS and <50 mW at 20 MSPS.

Can the digital outputs of the TLC5540INSR be placed in high-impedance state?

Yes - the TLC5540INSR features an active-low Output Enable (OE) pin (Pin 1). When OE is high, all eight digital outputs (D1–D8) enter a high-impedance state, as specified in the Terminal Functions table (page 3) and electrical characteristics (IOZH/IOZL leakage currents ≤16 µA). This enables direct connection to shared data buses without external buffers.