Texas Instruments TLC4545IDGKR

Overview

TLC4545IDGKR 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 frequency, 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 TLC4545IDGKR datasheet, TLC4545IDGKR pinout, TLC4545IDGKR application, or TLC4545IDGKR equivalent, key selection considerations include its pseudo-differential input architecture, SPI/DSP-compatible serial interface up to 15 MHz SCLK, auto-power-down mode (5 µA), and MSOP-8 (DGK) package compatibility with space-constrained PCB layouts.

Technical Context

The TLC4545IDGKR implements a charge-redistribution SAR architecture with built-in oscillator-based conversion clock (max 2.94 µs conversion time). Its pseudo-differential input pair (AIN(+) and AIN(−)) supports common-mode noise rejection, with AIN(−) tolerating ±0.2 V ripple for zero-scale offset cancellation.

It uses a 3-wire serial interface (CS, SCLK, SDO) with MSB-first output format and supports both SPI microcontroller (CPOL=0, CPHA=1) and TMS320 DSP interfaces via CS-only control - no FS pin required, unlike the TLC4541 variant.

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 TLC4541IDGKR, the TLC4545IDGKR uniquely balances 200-KSPS throughput, pseudo-differential input capability, and minimal pin count - making it optimal for compact, noise-immune industrial sensor nodes where board space and EMI resilience are critical.

Availability

TLC4545IDGKR is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and ATE system channel digitization requiring stable component supply and long-term lifecycle support.

Supply support for TLC4545IDGKR 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 silicon solutions for industrial, automotive, and communications markets.

The TLC4545 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and space-efficient digitization in industrial measurement and control systems.

FAQ

What is the maximum sampling rate supported by the TLC4545IDGKR?

The TLC4545IDGKR supports a maximum sampling rate of 200 KSPS, achieved with a 15 MHz SCLK and proper timing adherence per the datasheet. This rate enables full utilization of its 16-bit resolution while maintaining specified AC performance including 84.5 dB SINAD at 15 kHz input frequency. The built-in oscillator ensures consistent 2.94 µs conversion time regardless of external clock jitter.

Does the TLC4545IDGKR require an external reference voltage?

Yes, the TLC4545IDGKR requires an external reference voltage applied to the REF pin (Pin 2). The reference must be between 4 V and VDD (up to 5.5 V), with typical operation at 4.096 V. This reference defines the full-scale input range: V_AIN(+) = V_REF yields output code FFFFh. The device does not include an internal reference, and REF input impedance drops to 20–25 kΩ during conversion.

How does the pseudo-differential input of the TLC4545IDGKR differ from a true differential input?

The TLC4545IDGKR uses a pseudo-differential input architecture: AIN(+) is actively sampled, while AIN(−) serves as a fixed common-mode reference point (not inverted and sampled). AIN(−) accepts only ±0.2 V deviation from GND and is used for zero-scale offset cancellation or ground noise rejection - not for full differential signal subtraction. True differential ADCs like ADS8325 sample both inputs simultaneously with complementary paths.

Can the TLC4545IDGKR interface directly with a TMS320 DSP without additional logic?

Yes, the TLC4545IDGKR interfaces directly with TMS320 DSPs using its CS pin (Pin 1) as the frame sync input - eliminating the need for a separate FS pin. The DSP's FS output connects to CS, and the device operates in CS-triggered mode with MSB presented after the falling edge. No level-shifting or glue logic is required, and timing aligns with standard TMS320 serial port configurations (CPOL=0, CPHA=1).

What is the power consumption profile of the TLC4545IDGKR during active and idle states?

The TLC4545IDGKR draws 3.5 mA typical supply current during active conversion and 5 µA in auto-power-down mode. Power-down activates automatically at the end of each conversion cycle and wakes on the next CS falling edge. This ultra-low standby current enables energy-efficient operation in battery-powered data loggers and portable test equipment where duty-cycled sampling is employed.