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Texas Instruments TLC3545ID
- Part No.:
- TLC3545ID
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC3545ID.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,197
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Product details
Overview
TLC3545ID from Texas Instruments is a 14-bit pseudo-differential successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 5-V supply, delivering 200-KSPS sampling rate, ±1 LSB INL/DNL, and 81.5 dB SINAD at 15 kHz input - used in precision industrial process control and motor control feedback loops.
For engineers reviewing the TLC3545ID datasheet, TLC3545ID pinout, TLC3545ID application, or TLC3545ID equivalent, key selection considerations include its 8-pin SOIC package, SPI/DSP-compatible serial interface with up to 15 MHz SCLK, rail-to-rail analog input with 500 kHz bandwidth, and auto-power-down mode reducing current to 5 µA.
Technical Context
The TLC3545ID implements a charge-redistribution SAR architecture with built-in oscillator-based conversion clock (7.5–12 MHz), achieving 1.67–2.67 µs conversion time and 20-SCLK sample period. It supports pseudo-differential input via dedicated AIN(+) and AIN(−) terminals, where AIN(−) tolerates ±0.2 V ripple for ground noise rejection and zero-scale offset cancellation.
Control is exclusively via the CS pin (pin 1), eliminating need for FS signal unlike the TLC3541; serial output is MSB-first unipolar straight binary (0000h = GND, 3FFFh = VREF − 1 LSB), with data valid on falling SCLK edges and output updates on rising SCLK edges - compatible with SPI microcontrollers (CPOL = 0, CPHA = 1) and TMS320 DSPs using CS-as-FS configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit SAR ADC with unipolar straight binary output (0000h to 3FFFh) |
| Sampling Rate | 200 KSPS maximum - enables real-time capture of 500 kHz full-power bandwidth signals |
| INL / DNL | ±1 LSB max - ensures monotonicity and <0.006% linearity error over full scale |
| SINAD / SFDR | 81.5 dB / 95 dB at 15 kHz - supports high-fidelity measurement in noisy industrial environments |
| Supply & Power | Single 5-V supply (4.5–5.5 V); 3.5 mA operating current, 5 µA auto-power-down current |
| Analog Input | Rail-to-rail pseudo-differential: AIN(+) 0–VDD, AIN(−) ±0.2 V - rejects common-mode noise without external instrumentation amp |
| Serial Interface | SPI/DSP-compatible 3-wire: CS, SCLK (up to 15 MHz), SDO; no FS pin required |
Pinout & Package
Package: 8-pin SOIC (D), RoHS-compliant, MSL Level-1, −40°C to +85°C operating range, marked "3545I".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS | Chip Select input | Active-low control initiating sampling cycle; also accepts DSP frame sync signal - sole control pin for TLC3545ID |
| 2: REF | External reference voltage input | Defines full-scale range (4–VDD V); input impedance 20–25 kΩ during conversion, 100 MΩ when idle |
| 3: GND | Analog/digital ground return | Common reference for internal circuitry and analog inputs; must be low-impedance connection |
| 4: AIN(+) | Positive analog input | Main signal input terminal; rail-to-rail capable (0 to VDD), 11–14 pF input capacitance |
| 5: AIN(−) | Negative analog input | Pseudo-differential reference terminal; accepts ±0.2 V common-mode swing for noise rejection |
| 6: VDD | Positive supply voltage | Single 4.5–5.5 V supply powering analog and digital sections; decoupling capacitor required |
| 7: SCLK | Serial clock input | Accepts up to 15 MHz clock; timing-critical for data validity (data valid on falling edge) |
| 8: SDO | Serial data output | 3-state MSB-first output; high-impedance when CS high; returns to Hi-Z after 17th SCLK rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock | Eliminates external crystal or clock generator - reduces BOM count and layout complexity |
| Pseudo-differential input architecture | Enables ground-referenced signal acquisition with inherent common-mode noise rejection without instrumentation amplifier |
| Auto-power-down mode | Reduces supply current from 3.5 mA to 5 µA between conversions - critical for low-duty-cycle sensing applications |
| Pin-compatible 12-/14-/16-bit family | Allows design reuse across resolution tiers in same 8-pin SOIC footprint - simplifies upgrade paths |
| SPI/DSP serial interface | Direct 3-wire connection to microcontrollers (SPI) or TMS320 DSPs (CS-as-FS) - no protocol translation needed |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and flow sensor outputs in PLC I/O modules. IC Role / Device Role / Timing Role: High-accuracy 14-bit digitization of conditioned analog sensor signals with minimal latency. Use Value: ±1 LSB INL ensures calibrated measurement integrity across 0–10 V industrial ranges without software correction. |
Use Scenario: Sampling current-sense amplifier outputs in closed-loop servo drives. IC Role / Device Role / Timing Role: Pseudo-differential acquisition of shunt voltage with common-mode noise rejection from PWM switching. Use Value: AIN(−) tolerance of ±0.2 V suppresses ground bounce-induced errors during high-current transients. |
| Automated Test Equipment | Power Supply Monitoring |
|
Use Scenario: Digitizing DUT output waveforms in benchtop ATE systems requiring 200-KSPS throughput. IC Role / Device Role / Timing Role: High-SINAD (81.5 dB) ADC capturing spectral purity of test signals for pass/fail analysis. Use Value: 95 dB SFDR enables clean detection of spurious tones below −90 dBc in harmonic distortion tests. |
Use Scenario: Real-time monitoring of output voltage and current in programmable DC power supplies. IC Role / Device Role / Timing Role: Rail-to-rail input tracking of 0–5 V feedback signals with single-supply simplicity. Use Value: Single 5-V supply operation eliminates need for dual rails or level-shifting circuitry in supply control loop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit pseudo-differential SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit resolution, 100-KSPS, SPI-only interface, no auto-power-down | Higher resolution but lower speed; requires external reference and separate power domains | Select when absolute accuracy > resolution trade-off justifies reduced throughput and added complexity |
| MCP3304-I/P | 13-bit resolution, 100-KSPS, SPI interface, internal reference, no pseudo-differential mode | Lower cost, integrated reference, but lacks AIN(−) terminal - requires external differential amplifier | Select for cost-sensitive, single-ended applications where ±0.2 V common-mode rejection is not required |
Compared with ADS8325IPW and MCP3304-I/P, the TLC3545ID uniquely balances 14-bit precision, 200-KSPS speed, pseudo-differential input, and single-supply auto-power-down in an 8-pin SOIC - making it optimal for space-constrained industrial feedback systems requiring noise-immune analog acquisition.
Availability
TLC3545ID is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC3545ID 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 ICs.
The TLC3545ID belongs to TI's TLC35xx family of low-power, high-speed SAR ADCs designed specifically for industrial automation, motor control, and test instrumentation where pseudo-differential acquisition, SPI/DSP compatibility, and single-supply operation are essential.
FAQ
What is the exact resolution and output format of the TLC3545ID?
The TLC3545ID is a true 14-bit successive approximation register (SAR) ADC with unipolar straight binary output format: 0000h corresponds to GND-level input, and 3FFFh corresponds to VREF − 1 LSB. The device delivers ±1 LSB integral nonlinearity and differential nonlinearity across its full operating range, ensuring monotonic behavior and predictable code transitions. This resolution and coding scheme are confirmed in the SLAS345 datasheet Section 5 (DC specifications) and Section 11 (serial output data format).
Does the TLC3545ID require an external reference voltage, and what are its voltage limits?
Yes, the TLC3545ID requires an external reference voltage applied to pin 2 (REF). The specified range is 4 V to VDD (max 5.5 V), with typical operation at 4.096 V. Absolute maximum rating prohibits exceeding VDD + 0.3 V, and the input impedance drops to 20–25 kΩ during active conversion - necessitating a low-impedance reference source. These values are explicitly defined in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of the SLAS345 datasheet.
How does the pseudo-differential input of the TLC3545ID differ from true differential input, and what is the role of AIN(−)?
The TLC3545ID uses pseudo-differential input: AIN(+) is the primary signal path, while AIN(−) serves as a dedicated common-mode reference that accepts ±0.2 V ripple - not a fully differential pair. Its purpose is zero-scale offset cancellation and ground noise rejection, not symmetrical signal subtraction. Unlike true differential ADCs, it does not digitize the voltage difference between AIN(+) and AIN(−); instead, AIN(−) stabilizes the sampling node against shared noise. This architecture is detailed in the "Pseudo-Differential Inputs" section (page 16) of SLAS345.
What is the minimum and maximum SCLK frequency supported by the TLC3545ID, and how does timing affect data validity?
The TLC3545ID supports SCLK frequencies from 100 kHz to 15 MHz (15,000 kHz), with timing margins defined down to 66 ns cycle time. Data bits are valid on the falling edge of SCLK, and change on the rising edge - requiring host controllers to sample on falling edges (CPHA = 1). Setup/hold times (e.g., tsu1 = 15 ns, th2 = 5 ns) and propagation delays (td1 = 12–17 ns) are strictly bounded per the "Timing Requirements" table (page 6 of SLAS345). Exceeding timing limits risks invalid or incomplete conversion results.
Can the TLC3545ID operate without a DSP frame sync (FS) signal, and how is it interfaced to an SPI microcontroller?
Yes - the TLC3545ID has no FS pin and operates exclusively via the CS pin (pin 1), making it inherently SPI-compatible. To interface with an SPI microcontroller, configure CPOL = 0 (clock idle low) and CPHA = 1 (data sampled on falling SCLK edge). The falling edge of CS initiates sampling; SDO presents MSB after CS fall, and subsequent bits align to falling SCLK edges. This configuration is validated in Figure 15 ("SPI Cycle Timing") and Section 12.2 of the SLAS345 datasheet.
TLC3545ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- -
TLC3545ID FAQ
1.How can I place an order for TLC3545ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC3545ID 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 TLC3545ID reliable?
The price and inventory of TLC3545ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC3545ID is usually 5 days.
3.What payment methods are accepted for TLC3545ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC3545ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC3545ID?
TLC3545ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC3545ID 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 TLC3545ID?
For technical support, including TLC3545ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC3545ID requirements.
6.How does Aetrix verify that TLC3545ID is sourced from the original manufacturer or authorized distributors?
All TLC3545ID 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 TLC3545ID meets industry standards.
7.What is the process for return or replacement of TLC3545ID?
All TLC3545ID units undergo pre-shipment inspection (PSI). If there is an issue with TLC3545ID, 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 TLC3545ID part is unused and in its original packaging.
Return procedure for TLC3545ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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