Texas Instruments TLC4545IDGKRG4

Overview

TLC4545IDGKRG4 from Texas Instruments is a 16-bit pseudo-differential successive-approximation analog-to-digital converter (SAR ADC) operating from a single 5-V supply. It delivers 200-KSPS sampling rate, ±2.5 LSB INL, and 84.5 dB SINAD at 15 kHz input, with rail-to-rail analog input bandwidth of 500 kHz. It is used in precision industrial measurement systems requiring high-resolution digitization of differential sensor signals.

For engineers reviewing the TLC4545IDGKRG4 datasheet, TLC4545IDGKRG4 pinout, TLC4545IDGKRG4 application, or TLC4545IDGKRG4 equivalent, key selection considerations include its pseudo-differential input architecture, SPI/DSP-compatible 3-wire serial interface (CS/SCLK/SDO), auto-power-down mode (5 µA), and MSOP-8 package compatibility with 12/14/16-bit family members.

Technical Context

The TLC4545IDGKRG4 implements a charge-redistribution SAR architecture with built-in oscillator-based conversion clock (max 2.94 µs), eliminating external timing components. Its pseudo-differential input pair (AIN(+) and AIN(−)) supports common-mode noise rejection up to ±0.2 V on the inverted input, enabling robust zero-scale offset cancellation in noisy industrial environments.

It operates exclusively via chip-select (CS) control - unlike the TLC4541, it lacks a dedicated FS pin - and outputs 16-bit unipolar straight-binary data MSB-first on SDO, synchronized to SCLK rising edges, with data valid on falling SCLK edges. The device enters auto-power-down after conversion completion and wakes on CS falling edge.

Key Specifications

Pinout & Package

Package: 8-pin VSSOP (DGK), 3.0 mm × 3.0 mm body, 0.65 mm pitch, RoHS-compliant NIPDAUAG finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8325IDGKR and ADS8320E/2K5, the TLC4545IDGKRG4 uniquely combines 200 KSPS speed, pseudo-differential input, and DSP-compatible CS-triggered timing in an MSOP-8 package - making it optimal for noise-immune, high-throughput industrial digitization where layout space and EMI resilience are critical.

Availability

TLC4545IDGKRG4 is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and automated test equipment requiring stable component supply and long-term manufacturability.

Supply support for TLC4545IDGKRG4 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 over 50 years of innovation in precision data converters.

The TLC454x family was designed for high-resolution, low-power industrial and test instrumentation applications requiring compact 8-pin packaging and seamless integration with both microcontrollers and DSPs.

FAQ

What is the input configuration supported by the TLC4545IDGKRG4?

The TLC4545IDGKRG4 supports pseudo-differential input mode using dedicated AIN(+) and AIN(−) pins. Unlike true differential ADCs, it digitizes the voltage difference between these inputs but encodes the result as a unipolar 16-bit value referenced to GND and VREF. The AIN(−) pin tolerates ±0.2 V common-mode ripple, enabling ground noise rejection and zero-scale offset cancellation in industrial sensor interfaces - a capability confirmed in the SLAS293 datasheet Section "Pseudo-Differential Inputs".

Does the TLC4545IDGKRG4 require an external clock for conversion?

No, the TLC4545IDGKRG4 does not require an external clock for conversion. It integrates a built-in oscillator that generates the internal conversion clock, resulting in a fixed maximum conversion time of 2.94 µs. This eliminates the need for external timing components and simplifies system design - a feature explicitly stated in the "FEATURES" section of the SLAS293 datasheet and verified in the "PRINCIPLES OF OPERATION" timing diagrams (Figures 15–17).

What is the serial interface protocol compatibility of the TLC4545IDGKRG4?

The TLC4545IDGKRG4 supports SPI- and DSP-compatible 3-wire serial communication using CS, SCLK, and SDO. It operates with CPOL=0 and CPHA=1 timing, delivering MSB-first unipolar binary data. Unlike the TLC4541, it uses only the CS pin (no separate FS pin), allowing direct connection to TMS320 DSP frame-sync outputs. This dual-mode interoperability is documented in the "CONTROL AND TIMING" section of SLAS293, including Figures 15 and 16.

What is the power consumption profile of the TLC4545IDGKRG4 in active and power-down modes?

The TLC4545IDGKRG4 draws 3.5 mA typical supply current during active conversion and automatically enters a 5 µA power-down state after conversion completion. Wake-up occurs on the next CS falling edge, with fast recovery suitable for burst-mode acquisition. These values are specified in the "ELECTRICAL CHARACTERISTICS" table (ICC = 3.5 mA, ICC(PD) = 3–5 µA) and validated in the "AUTO-POWER DOWN AND POWER UP" subsection of SLAS293.

Is the TLC4545IDGKRG4 pin-compatible with other devices in the TLC454x family?

Yes, the TLC4545IDGKRG4 is pin-compatible with the TLC4541, TLC4542, and TLC4543 in both SOIC-8 (D) and VSSOP-8 (DGK) packages. All share identical pin functions (CS, REF, GND, AIN/AIN(+), SCLK, VDD, SDO), enabling drop-in resolution upgrades without PCB changes. This compatibility is explicitly declared in the "FEATURES" section ("Pin Compatible 12/14/16-Bit Family in 8-Pin SOIC and MSOP Packages") and confirmed in the "AVAILABLE OPTIONS" table of SLAS293.