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Texas Instruments TLC4545IDR
- Part No.:
- TLC4545IDR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC4545IDR.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
TLC4545IDR from Texas Instruments is a 16-bit pseudo-differential successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 5-V supply. It delivers 200-KSPS sampling rate, ±2.5 LSB max INL, and 84.5 dB SINAD at 15 kHz input, with rail-to-rail analog input bandwidth of 500 kHz. It serves precision industrial measurement and motor control systems requiring high-resolution digitization of differential-like signals with low power consumption.
For engineers reviewing the TLC4545IDR datasheet, TLC4545IDR pinout, TLC4545IDR application, or TLC4545IDR equivalent, key selection considerations include its pseudo-differential input architecture (AIN(+) and AIN(−)), SPI/DSP-compatible 3-wire serial interface (CS/SCLK/SDO), auto-power-down mode (5 µA), and SOIC-8 package compatibility with TI's 12/14/16-bit ADC family.
Technical Context
The TLC4545IDR implements a charge-redistribution SAR architecture with an internal oscillator-based conversion clock (max 2.94 µs conversion time). Its pseudo-differential input accepts AIN(+) and AIN(−) with ±0.2 V common-mode tolerance on AIN(−), enabling ground noise rejection and zero-scale offset cancellation without external instrumentation amplifiers.
It supports three control modes: SPI-style via CS-only (CPOL=0, CPHA=1), DSP frame-sync emulation via CS-as-FS, and dedicated DSP interface (TLC4541 only). All modes use MSB-first serial output on SDO, with data valid on falling SCLK edges and updates on rising SCLK edges - fully compatible with TMS320-series DSPs and standard microcontroller SPI peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit unipolar straight binary output (0000h to FFFFh); enables 1:65,536 dynamic range for high-fidelity signal capture. |
| Sampling Rate | 200 KSPS maximum; supports real-time acquisition of audio-band and motor control feedback signals up to 500 kHz full-power bandwidth (−1 dB). |
| INL / DNL | ±2.5 LSB max INL, −1 to +2 LSB max DNL; ensures monotonicity and <0.004% integral linearity error for calibrated measurement systems. |
| SINAD / SFDR | 84.5 dB SINAD and 95 dB SFDR at 15 kHz; provides >13.7 ENOB and robust spurious-free performance in noisy industrial environments. |
| Supply & Power | Single 4.5–5.5 V supply; 3.5 mA active current, 5 µA auto-power-down current - suitable for battery-backed or energy-conscious embedded nodes. |
| Reference Input | External VREF (4.0–5.0 V); sets full-scale range directly - eliminates internal reference drift and allows system-level calibration traceability. |
| Serial Interface | SPI/DSP-compatible 3-wire (CS/SCLK/SDO); SCLK up to 15 MHz; no external frame sync required (FS pin absent on TLC4545). |
Pinout & Package
Package: 8-pin SOIC (D), RoHS-compliant, moisture sensitivity level 1, rated for −40°C to +85°C operation. Marking: "4545I". Compatible with standard SOIC-8 reflow profiles (peak 260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS | Chip Select input | Active-low control initiating sampling, conversion, and SDO enable; doubles as FS input when interfacing with TMS320 DSPs. |
| 2: REF | External reference voltage input | Defines full-scale analog input range (VREF = 4.0–5.0 V); high-impedance (20–25 kΩ) during conversion, requires local decoupling. |
| 3: GND | Analog/digital ground return | Common reference for all analog and digital circuitry; must be low-impedance and star-connected to minimize noise coupling. |
| 4: AIN(+) | Positive analog input | Main signal input node; rail-to-rail capable (0 V to VDD), 500 kHz bandwidth, 11–14 pF input capacitance. |
| 5: AIN(−) | Negative analog input | Pseudo-differential reference node; accepts ±0.2 V ripple for common-mode noise rejection and zero-scale offset cancellation. |
| 6: VDD | Positive supply | Single 4.5–5.5 V supply powering analog core, digital logic, and I/O; requires 0.1 µF ceramic bypass near pin. |
| 7: SCLK | Serial clock input | Asynchronous master clock (up to 15 MHz); timing-critical for data capture - setup/hold times specified per datasheet Figure 18. |
| 8: SDO | Serial data output | 3-state MSB-first output; tri-states when CS is high or after 17th SCLK rising edge; driven by internal weak pull-up if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock | Eliminates need for external crystal or clock generator - reduces BOM count and layout complexity while guaranteeing deterministic 2.94 µs max conversion time. |
| Pseudo-differential input architecture | Enables rejection of ground bounce and common-mode noise without dual op-amp front-end; AIN(−) tolerance (±0.2 V) supports direct connection to sensor return paths. |
| Auto-power-down mode | Reduces supply current from 3.5 mA to 5 µA between conversions - extends battery life in portable test equipment and lowers thermal load in dense PCB layouts. |
| SPI/DSP serial interface | Direct 3-wire connection to microcontrollers (SPI mode) or TMS320 DSPs (FS-emulation mode) - avoids protocol translation ICs and simplifies firmware driver development. |
| Pin-compatible 12/14/16-bit family | SOIC-8 footprint shared with TLC4541/4545/4549 series - allows resolution scalability within same PCB layout, reducing NRE and qualification effort across product variants. |
Applications
| Industrial Process Monitoring | Motor Phase Current Sensing |
|---|---|
Use Scenario: High-accuracy monitoring of temperature, pressure, and flow transducers in PLC I/O modules and distributed control systems. IC Role / Device Role / Timing Role: Primary 16-bit digitizer for analog sensor outputs; samples at 200 KSPS with synchronized trigger via CS to align with control loop timing. Use Value: ±2.5 LSB INL and 84.5 dB SINAD ensure sub-0.01% measurement uncertainty over full industrial temperature range (−40°C to +85°C). |
Use Scenario: Real-time acquisition of shunt-based phase currents in 3-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Pseudo-differential ADC capturing AIN(+) (shunt voltage) and AIN(−) (inverter leg return), rejecting PWM switching noise. Use Value: ±0.2 V AIN(−) tolerance and 500 kHz analog bandwidth support accurate current reconstruction even under high dv/dt conditions. |
| Programmable Logic Controller (PLC) Analog Input Module | Automated Test Equipment (ATE) Digitizer Channel |
Use Scenario: Modular analog input card supporting multiple voltage/current ranges in rack-mounted PLCs with hot-swap capability. IC Role / Device Role / Timing Role: Precision ADC paired with programmable gain amplifier (PGA); uses external VREF for range flexibility and system-level calibration. Use Value: External reference input (4–5 V) and 16-bit resolution enable software-selectable ranges (e.g., ±10 V, 0–20 mA) without hardware change. |
Use Scenario: High-fidelity waveform capture channel in benchtop ATE systems validating mixed-signal ICs and RF components. IC Role / Device Role / Timing Role: Standalone digitizer stage with deterministic 2.94 µs conversion time and 15 MHz SCLK interface for fast data streaming to FPGA memory buffers. Use Value: 95 dB SFDR and 13.7 ENOB meet Class I ATE spectral purity requirements for harmonic distortion analysis up to 15 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100-KSPS, SPI-only interface, no pseudo-differential input; requires external reference; 16-pin TSSOP package. | Lacks AIN(−) pin and common-mode noise rejection capability; suited for single-ended sensor interfaces where layout-controlled grounding suffices. | Select when lower sampling rate is acceptable and board space permits larger TSSOP; verify external reference stability meets system accuracy targets. |
| ADS7816U | 16-bit, 200-KSPS, single-ended input only, 8-pin SOIC, but no auto-power-down (3.5 mA typical, no µA mode). | No pseudo-differential mode or power-down feature; simpler interface but higher static power draw limits battery use. | Choose for cost-sensitive designs where power budget allows continuous operation and differential noise immunity is not required. |
Compared with ADS8325IPW and ADS7816U, the TLC4545IDR uniquely combines pseudo-differential input, auto-power-down, and SOIC-8 pin compatibility - making it optimal for space-constrained, noise-prone, and energy-aware industrial digitization tasks.
Availability
TLC4545IDR is available at Aetrix Electronics and suitable for industrial process control, motor control, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TLC4545IDR 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 IC design.
The TLC4545IDR belongs to TI's high-performance SAR ADC family designed specifically for industrial measurement, motor control, and ATE applications demanding 16-bit resolution, low power, and robust serial interfacing in compact SOIC packages.
FAQ
What is the input configuration of the TLC4545IDR?
The TLC4545IDR features a pseudo-differential analog input with dedicated AIN(+) and AIN(−) pins. AIN(+) accepts rail-to-rail signals (0 V to VDD) with 500 kHz bandwidth, while AIN(−) tolerates ±0.2 V common-mode ripple - enabling ground noise rejection and zero-scale offset cancellation without external amplifiers. This differs from the single-ended TLC4541IDR and is confirmed in the device's terminal functions table and functional block diagram.
Does the TLC4545IDR require an external clock source for conversion?
No, the TLC4545IDR includes a built-in oscillator that serves as the conversion clock, eliminating the need for an external crystal or clock generator. Conversion time is fixed at a maximum of 2.94 µs, independent of the external SCLK frequency (which only controls serial data transfer). This internal clock is explicitly stated in the FEATURES and PRINCIPLES OF OPERATION sections of the SLAS293 datasheet.
What serial interface protocols does the TLC4545IDR support?
The TLC4545IDR supports SPI-compatible and TMS320 DSP-compatible serial interfaces using only three pins: CS, SCLK, and SDO. It operates in MSB-first format with data valid on falling SCLK edges. Unlike the TLC4541IDR, it has no FS pin - CS serves as both chip select and frame sync input when interfacing with DSPs. This is documented in the Terminal Functions and PRINCIPLES OF OPERATION sections.
What is the power consumption profile of the TLC4545IDR?
The TLC4545IDR draws 3.5 mA during active conversion and automatically enters a 5 µA power-down state between conversions. Wake-up occurs on the next CS falling edge, with no additional latency. This auto-power-down behavior is intrinsic to the device architecture and verified in the Electrical Characteristics table (ICC = 3.5 mA, ICC(PD) = 5 µA) and PRINCIPLES OF OPERATION section.
Is the TLC4545IDR pin-compatible with other devices in TI's 454x family?
Yes, the TLC4545IDR is pin-compatible with the TLC4541IDR and TLC4549IDR in the same 8-pin SOIC (D) package. All share identical pin assignments for CS, REF, GND, AIN, VDD, SCLK, and SDO - enabling resolution upgrades (12/14/16-bit) without PCB redesign. This compatibility is explicitly stated in the FEATURES section and confirmed in the AVAILABLE OPTIONS table.
TLC4545IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC4545IDR FAQ
1.How can I place an order for TLC4545IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC4545IDR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLC4545IDR reliable?
The price and inventory of TLC4545IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC4545IDR is usually 5 days.
3.What payment methods are accepted for TLC4545IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC4545IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC4545IDR?
TLC4545IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC4545IDR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLC4545IDR?
For technical support, including TLC4545IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC4545IDR requirements.
6.How does Aetrix verify that TLC4545IDR is sourced from the original manufacturer or authorized distributors?
All TLC4545IDR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLC4545IDR meets industry standards.
7.What is the process for return or replacement of TLC4545IDR?
All TLC4545IDR units undergo pre-shipment inspection (PSI). If there is an issue with TLC4545IDR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLC4545IDR part is unused and in its original packaging.
Return procedure for TLC4545IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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