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Home > Products > Integrated Circuits (ICs) > Data Acquisition - Analog to Digital Converters (ADC) > TLC540IDW
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TLC540IDW

Manufacturer Part Number:
TLC540IDW
Manufacturer / Brand
Texas Instruments
Part of Description:
IC ADC 8BIT SAR 20SOIC
Datasheets:
TLC540IDW.pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 11766 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number TLC540IDW
Manufacturer / Brand Texas Instruments
Stock Quantity 11766 pcs Stock
Category Integrated Circuits (ICs) > Data Acquisition - Analog to Digital Converters (ADC)
Description IC ADC 8BIT SAR 20SOIC
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Supply, Digital 5V
Voltage - Supply, Analog 5V
Supplier Device Package 20-SOIC
Series -
Sampling Rate (Per Second) 75k
Reference Type External, Internal
Ratio - S/H:ADC 1:1
Package / Case 20-SOIC (0.295', 7.50mm Width)
Package Tube
Operating Temperature -40°C ~ 85°C
Number of Inputs 11
Number of Bits 8
Number of A/D Converters 1
Mounting Type Surface Mount
Input Type Single Ended
Features Selectable Address
Data Interface SPI
Configuration MUX-S/H-ADC
Base Product Number TLC540
Architecture SAR

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

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Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
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Frequently Asked Questions

What are the critical design considerations when integrating the TLC540IDW into a 5V single-supply system with multiple analog inputs?
The TLC540IDW operates on a 5V analog and digital supply, making it suitable for 5V systems. However, ensure that all input signals remain within the 0 to VREF range (typically up to 5V) to prevent overvoltage damage. When using the internal reference (2.5V), input signals must be biased appropriately—often via a voltage divider or op-amp buffer—to maintain accuracy across the full input span. Additionally, proper decoupling of both analog (AVDD) and digital (DVDD) supplies with 0.1µF ceramic capacitors close to the pins is essential to minimize noise coupling and ensure stable ADC performance.
Can the TLC540IDW directly interface with 3.3V logic microcontrollers without level shifting?
The TLC540IDW accepts digital input voltages up to VDD = 5V, but its logic thresholds are not 5V-tolerant from the digital side. While 3.3V CMOS-compatible levels may work if the device’s minimum high-level input voltage (VIH) is met (typically ≥0.7 × VDD = 3.5V for 5V operation), this leaves limited margin. To ensure reliable communication at all temperature extremes (-40°C to 85°C), it is safer to use a bidirectional level shifter or verify timing margins under worst-case conditions before assuming direct compatibility.
How does the selectable address feature impact PCB layout and system scalability in multi-device SPI configurations?
The TLC540IDW supports a selectable device address via external resistors on the A0 pin, enabling up to two devices on the same SPI bus. This requires careful resistor selection (e.g., 10kΩ to 100kΩ) to set distinct logic levels while avoiding loading effects. However, this limits scalability—only two devices can coexist without additional addressing schemes. For larger systems, consider alternative ADCs with dedicated chip-select lines or digital output expansion, as the TLC540IDW lacks native daisy-chaining or serial number-based addressing.
Is the TLC540IDW suitable for industrial temperature cycling applications requiring long-term reliability?
The TLC540IDW is rated for -40°C to 85°C, which meets standard industrial requirements. However, long-term reliability depends more on board-level factors than the IC itself. Ensure adequate thermal relief during soldering (MSL 1 allows unlimited floor life), avoid mechanical stress near the SOIC package, and verify signal integrity under repeated thermal cycles. Additionally, use conformal coating sparingly, as it may trap moisture; instead, follow IPC standards for assembly in harsh environments.
What are the limitations of using the internal reference versus an external precision reference with the TLC540IDW?
The TLC540IDW’s internal reference is nominally 2.5V with ±10% initial accuracy and degrades over time and temperature. For applications requiring >8-bit effective resolution or stability over extended periods, an external precision reference (e.g., REF5025 or LT6656) should be used. Using an external reference also enables ratiometric measurements and improves gain accuracy in sensor interfaces, but adds component count, cost, and board space.
Can the TLC540IDW replace the ADS7960SDBT in existing designs without modification?
No, the ADS7960SDBT is a direct substitute only if design constraints align precisely. The ADS7960 offers higher speed (up to 1MSPS), 12-bit resolution, and dual-channel capability, whereas the TLC540IDW provides 8-bit resolution at 75kSPS with single-channel operation. Migrating from ADS7960 to TLC540IDW would reduce data throughput and dynamic range, potentially necessitating changes in firmware sampling rates and calibration routines. Conversely, upgrading from TLC540IDW to ADS7960 would require verifying SPI timing compatibility and power budget compliance.
What clock source options are available for driving the TLC540IDW’s SAR engine?
The TLC540IDW uses the SPI SCLK signal as its master clock for conversion initiation and timing. It does not have an internal oscillator; thus, the host microcontroller must generate a consistent 250kHz to 500kHz clock during conversions. Clock jitter should be minimized (<1% period variation) to preserve monotonicity and linearity. In battery-powered systems, ensure SCLK duty cycle remains above 40% to meet setup/hold requirements across process corners.
Are there any known issues when cascading multiple TLC540IDWs using the selectable address feature?
Cascading two TLC540IDWs via A0 is feasible but introduces shared CS, SCLK, and MOSI lines. Careful attention must be paid to propagation delays and capacitive loading on the SPI bus, especially at higher SCLK frequencies. Additionally, simultaneous CS assertion could cause contention if not managed by firmware. It is recommended to implement a simple state machine that sequentially activates each device with sufficient settling time between conversions to prevent crosstalk through parasitic coupling.
What precautions should be taken when replacing the TLC540IDW in legacy embedded designs?
When substituting the TLC540IDW, verify that the replacement maintains identical pinout, supply sequencing, and timing budgets. Legacy systems often rely on the TLC540IDW’s specific conversion latency (~13.3µs at 75kSPS) and fixed S/H-to-ADC ratio (1:1). Substitutes like the ADS7960SDBT may alter these parameters, affecting real-time control loops. Always validate end-to-end system behavior under load, including worst-case noise conditions and EMI susceptibility, as newer parts may exhibit different electromagnetic characteristics.

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TLC540IDW

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IC ADC 8BIT SAR 20SOIC

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