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Texas Instruments TLC4545ID
- Part No.:
- TLC4545ID
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC4545ID.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
TLC4545ID from Texas Instruments is a 16-bit pseudo-differential successive-approximation analog-to-digital converter (SAR ADC) operating from a single 5-V supply, delivering 200-KSPS sampling rate, ±2.5 LSB INL, and 84.5 dB SINAD at 15 kHz input - used in precision industrial measurement and motor control feedback loops.
For engineers reviewing the TLC4545ID datasheet, TLC4545ID pinout, TLC4545ID application, or TLC4545ID equivalent, this page delivers verified technical context, package-specific terminal roles, real-world timing constraints, and validated alternative options for high-accuracy data acquisition systems requiring rail-to-rail analog input and SPI/DSP-compatible serial interface.
Technical Context
The TLC4545ID implements a charge-redistribution SAR architecture with built-in 7.5–12 MHz oscillator for conversion clocking, enabling fixed 2.94 µs max conversion time. It supports pseudo-differential input (AIN+ and AIN−), where AIN− accepts ±0.2 V common-mode ripple for ground noise rejection and zero-scale offset cancellation.
Serial interface operates via 3-wire SPI-compatible protocol (CS, SCLK, SDO) with MSB-first output, 16-bit unipolar straight-binary format, and auto-power-down mode reducing current to 5 µA between conversions. Control is exclusively through CS (pin 1); no FS pin is used - distinguishing it from the TLC4541 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR architecture delivering 65,536 discrete output codes for high dynamic range digitization. |
| Sampling Rate | 200 KSPS maximum - supports real-time capture of signals up to 500 kHz full-power bandwidth (−1 dB). |
| INL / DNL | ±2.5 LSB max integral nonlinearity and −1 to +2 LSB differential nonlinearity - ensures monotonicity and accurate transfer function across full scale. |
| SINAD / SFDR | 84.5 dB SINAD and 95 dB spurious-free dynamic range at 15 kHz - enables clean spectral analysis in ATE and instrumentation. |
| Supply & Power | Single 4.5–5.5 V supply; 3.5 mA active current, 5 µA auto-power-down current - suitable for low-power embedded DAQ nodes. |
| Analog Input | Rail-to-rail unipolar input with pseudo-differential configuration (AIN+, AIN−); AIN− tolerates ±0.2 V ripple for noise immunity. |
| Reference Input | External VREF (4–5 V) sets full-scale range; input impedance 20–25 kΩ at 15 MHz SCLK - requires low-impedance reference source. |
Pinout & Package
Package: 8-pin SOIC (D), RoHS-compliant, MSL Level-1, −40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select Input | Active-low control initiating sampling cycle; falling edge triggers acquisition and conversion sequence - sole control signal (no FS pin used). |
| 2 - REF | Reference Voltage Input | External 4–5 V reference sets ADC full-scale; high-impedance input demands stable, low-noise reference source. |
| 3 - GND | Analog/Digital Ground | Common return for internal circuitry; must be connected to system ground plane with low-inductance path to minimize noise coupling. |
| 4 - AIN(+) | Positive Analog Input | Main signal input for pseudo-differential mode; accepts rail-to-rail unipolar voltage (0 V to VDD). |
| 5 - AIN(−) | Negative Analog Input | Inverted input accepting ±0.2 V common-mode ripple - used for ground noise rejection and zero-scale calibration. |
| 6 - VDD | Positive Supply | 4.5–5.5 V single supply powering analog and digital sections; bypass with 0.1 µF ceramic capacitor near pin. |
| 7 - SCLK | Serial Clock Input | Up to 15 MHz external clock synchronizing serial data output; timing-critical for valid SDO setup/hold windows. |
| 8 - SDO | Serial Data Output | 3-state MSB-first output; presents 16-bit result after CS falling edge; returns to high-Z after 17th SCLK rising edge. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables common-mode noise rejection on AIN(−) with ±0.2 V tolerance - improves accuracy in noisy industrial environments. |
| Built-in conversion clock oscillator | Eliminates need for external clock source; guarantees fixed 2.94 µs max conversion time independent of SCLK jitter. |
| SPI/DSP-compatible serial interface | 3-wire CS/SCLK/SDO with MSB-first, unipolar binary output - interoperable with TMS320 DSPs and microcontrollers using CPOL=0/CPHA=1. |
| Auto-power-down mode | Reduces supply current to 5 µA between conversions - extends battery life in portable measurement equipment without external power gating. |
| Rail-to-rail analog input bandwidth | 500 kHz (−1 dB) full-power bandwidth supports fast transient capture in motor phase current sensing and vibration monitoring. |
Applications
| Industrial Process Monitoring | Motor Phase Current Sensing |
|---|---|
|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: High-accuracy 16-bit digitization of conditioned analog sensor signals with minimal latency and deterministic 2.94 µs conversion time. Use Value: ±2.5 LSB INL and 84.5 dB SINAD ensure <0.004% full-scale error and clean FFT spectra for reliable fault detection algorithms. |
Use Scenario: Real-time sampling of shunt-based current waveforms in three-phase inverter drives. IC Role / Device Role / Timing Role: Pseudo-differential acquisition of differential voltage across current-sense resistor with AIN(−) rejecting ground bounce. Use Value: ±0.2 V AIN(−) common-mode tolerance suppresses switching noise, preserving resolution in 200-KSPS closed-loop control. |
| Automated Test Equipment (ATE) | High-Fidelity Data Logging |
|
Use Scenario: Modular instrument cards capturing multi-channel sensor data under programmable trigger conditions. IC Role / Device Role / Timing Role: Precision digitizer interfaced to FPGA or DSP via 15 MHz SCLK for high-throughput streaming. Use Value: 95 dB SFDR and 13.7 ENOB enable >80 dB effective dynamic range - sufficient for 12-bit+ measurement repeatability. |
Use Scenario: Battery-powered field recorder acquiring vibration, acoustic, or environmental data over extended periods. IC Role / Device Role / Timing Role: Low-power SAR ADC with auto-power-down activated between samples to minimize average current draw. Use Value: 5 µA power-down current and 3.5 mA active current allow >1-year operation on AA batteries at 100 SPS sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit pseudo-differential SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100-KSPS, SPI-only interface, no built-in oscillator - requires external clock; 1.8–5.5 V supply. | Lacks pseudo-differential input; uses single-ended AIN only - unsuitable for ground-noise-sensitive current sensing. | Select when lower sampling rate suffices and external clock control is preferred; verify layout compatibility with 16-pin TSSOP package. |
| ADS8326IPW | 16-bit, 100-KSPS, pseudo-differential input, internal reference option (2.5 V), but no auto-power-down mode. | Higher 10 µA standby current vs. TLC4545ID's 5 µA - impacts battery life in portable loggers. | Choose when integrated reference simplifies BOM; accept trade-off in power efficiency and reduced max sampling rate. |
Compared with ADS8325IPW and ADS8326IPW, the TLC4545ID uniquely combines 200-KSPS speed, built-in oscillator, pseudo-differential input with ±0.2 V AIN(−) tolerance, and 5 µA auto-power-down - making it optimal for noise-immune, high-throughput, low-power industrial DAQ.
Availability
TLC4545ID is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC4545ID 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 90 years of innovation in precision data conversion.
The TLC4545ID belongs to TI's high-performance SAR ADC product line, designed specifically for industrial and instrumentation applications demanding accuracy, low power, and robust serial interfacing without external clock dependencies.
FAQ
What is the maximum sampling rate supported by the TLC4545ID?
The TLC4545ID supports a maximum sampling rate of 200 KSPS, enabled by its internal oscillator and optimized serial interface. This rate is achievable with SCLK up to 15 MHz and ensures full 16-bit resolution without pipeline latency. The TLC4545ID maintains specified AC performance - including 84.5 dB SINAD - only at this rated speed under recommended operating conditions.
Does the TLC4545ID require an external clock source for conversion?
No, the TLC4545ID does not require an external clock source for conversion. It integrates a 7.5–12 MHz oscillator that generates the internal conversion clock, resulting in a guaranteed maximum conversion time of 2.94 µs. External SCLK (up to 15 MHz) is used solely for serial data transfer timing, not for core ADC operation.
How does the pseudo-differential input of the TLC4545ID improve measurement accuracy?
The TLC4545ID's pseudo-differential input uses AIN(+) and AIN(−) terminals to reject common-mode noise: AIN(−) accepts up to ±0.2 V ripple, allowing it to absorb ground bounce or supply noise while preserving signal integrity on AIN(+). This architecture directly improves DC accuracy and dynamic performance in electrically noisy environments like motor drives or factory-floor instrumentation.
What is the purpose of the auto-power-down feature in the TLC4545ID?
The auto-power-down feature reduces the TLC4545ID's supply current from 3.5 mA (active) to 5 µA between conversions, minimizing average power consumption without external control logic. Wake-up occurs automatically on the next CS falling edge, with no added latency - making it ideal for battery-powered data loggers and energy-conscious industrial sensors relying on the TLC4545ID.
Can the TLC4545ID interface directly with a TMS320 DSP without level-shifting?
Yes, the TLC4545ID interfaces directly with TMS320 DSPs using its CS pin as a frame-sync substitute - no level-shifting is required. Its digital I/O thresholds (VIH = 2.1 V, VIL = 0.8 V at 5 V VDD) are compatible with standard 3.3 V and 5 V DSP I/O, and its 3-state SDO output prevents bus contention. The TLC4545ID eliminates the need for FS pin routing used by the TLC4541, simplifying DSP integration.
TLC4545ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
TLC4545ID FAQ
1.How can I place an order for TLC4545ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC4545ID 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 TLC4545ID reliable?
The price and inventory of TLC4545ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC4545ID is usually 5 days.
3.What payment methods are accepted for TLC4545ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC4545ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC4545ID?
TLC4545ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC4545ID 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 TLC4545ID?
For technical support, including TLC4545ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC4545ID requirements.
6.How does Aetrix verify that TLC4545ID is sourced from the original manufacturer or authorized distributors?
All TLC4545ID 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 TLC4545ID meets industry standards.
7.What is the process for return or replacement of TLC4545ID?
All TLC4545ID units undergo pre-shipment inspection (PSI). If there is an issue with TLC4545ID, 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 TLC4545ID part is unused and in its original packaging.
Return procedure for TLC4545ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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