My Inquiry
My Account
Texas Instruments TLC1542CDWR
- Part No.:
- TLC1542CDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC1542CDWR.pdf
- Description:
- IC ADC 10BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLC1542CDWR from Texas Instruments is a 10-bit CMOS successive-approximation analog-to-digital converter with 11 analog input channels, on-chip 14-channel multiplexer, inherent sample-and-hold, and serial 4-wire interface (CS, I/O CLOCK, ADDRESS, DATA OUT). It delivers ±1 LSB total unadjusted error, operates from 4.5 V to 5.5 V, and supports ratiometric conversion via differential REF+/REF− inputs - used in industrial sensor signal conditioning and microcontroller-based data acquisition systems.
For engineers reviewing the TLC1542CDWR datasheet, TLC1542CDWR pinout, TLC1542CDWR application, or TLC1542CDWR equivalent, this page provides verified technical context, validated pin functions, confirmed timing behavior (21 µs conversion time, 10–16 clock transfer modes), real-world application mappings, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The TLC1542CDWR implements a switched-capacitor SAR architecture with internal system clock generation, enabling autonomous sampling and conversion without external timing components. Its 14-channel multiplexer selects among 11 external analog inputs (A0–A10) or three internal self-test voltages (VREF−, VREF+, mid-scale), all controlled via 4-bit serial address input.
Serial communication uses a synchronous 4-wire protocol: CS initiates/terminates transfers; I/O CLOCK clocks in 4-bit addresses and shifts out 10-bit results; DATA OUT is 3-state with MSB-first output; EOC signals completion on the tenth clock's falling edge. Fast and slow timing modes support flexible host interface integration across microcontrollers and DSPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete digital codes over full-scale range |
| Analog Inputs | 11 dedicated channels (A0–A10) + 3 internal test voltages - enables multi-sensor monitoring without external mux |
| Total Unadjusted Error | ±1 LSB max - ensures monotonicity and ≤0.1% full-scale accuracy without calibration |
| Conversion Time | 21 µs - deterministic latency critical for real-time closed-loop control |
| Reference Interface | Differential REF+/REF− - supports ratiometric sensing, noise rejection, and isolated supply designs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic and mixed-voltage embedded systems |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade industrial and instrumentation environments |
| Serial Interface | 4-wire (CS, I/O CLOCK, ADDRESS, DATA OUT) - direct connection to MCU SPI peripherals with no glue logic |
Pinout & Package
Package: SOIC-20 (DW), RoHS-compliant, surface-mount, 0.300-inch body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Analog input terminals | 11 single-ended analog voltage inputs; driven by sources ≤1 kΩ impedance to avoid sampling error |
| REF+ | Positive reference input | Defines upper full-scale threshold; typically tied to VCC or precision reference for ratiometric accuracy |
| REF− | Negative reference input | Defines lower zero-scale threshold; may be grounded or offset for bipolar operation |
| VCC | Positive supply | 4.5–5.5 V digital/analog supply; decoupling capacitor required at pin for noise immunity |
| GND | Ground return | Common reference for analog circuitry, digital logic, and reference inputs |
| CS | Chip select input | Active-low enable: falling edge resets counters and activates I/O CLOCK/ADDRESS; rising edge disables outputs |
| I/O CLOCK | Serial clock input/output | Drives address loading (first 4 rising edges), sampling window (4th–10th falling edges), and data shifting (9 falling edges) |
| ADDRESS | Serial address input | 4-bit channel select (MSB first); determines next analog input or self-test mode before conversion begins |
| DATA OUT | 3-state serial data output | MSB-first 10-bit result; high-impedance when CS high; driven low after 10th clock to pad unused LSBs |
| EOC | End-of-conversion output | Active-low pulse: falls on 10th I/O CLOCK falling edge and rises when conversion completes (21 µs later) |
Key Features
| Feature | Design Value |
|---|---|
| Inherent sample-and-hold | Automatic acquisition during 6-clock sampling window - eliminates need for external S/H circuitry |
| Three self-test modes | Internal VREF−, VREF+, and mid-scale (3FFh) test voltages - enable runtime diagnostics without external stimuli |
| Terminal compatibility with TLC542 | Pin- and function-compatible replacement - allows drop-in upgrade from older 8-bit devices with no PCB change |
| On-chip system clock | Self-timed conversion core - removes dependency on external clock source for basic operation |
| Break-before-make multiplexer | Prevents transient coupling between channels during switching - reduces crosstalk in multi-channel sampling |
| CMOS process technology | Low power (0.8–2.5 mA ICC) and high noise immunity - suitable for dense mixed-signal PCB layouts |
Applications
| Industrial Sensor Monitoring | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Continuous voltage monitoring of 10+ temperature, pressure, and position sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Central 10-bit ADC interfacing to microcontroller via SPI-compatible 4-wire bus; handles multiplexed sampling with 21 µs per channel. Use Value: Eliminates external multiplexer and sample-hold ICs while maintaining ±1 LSB accuracy across 0°C–70°C operating range. |
Use Scenario: Analog signal digitization for HVAC actuators, door lock status, and ambient light sensing in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Low-power 10-bit ADC with ratiometric REF+/REF− inputs, synchronized to microcontroller's serial peripheral interface. Use Value: Enables stable measurements despite battery voltage fluctuations using VCC-referenced conversion. |
| Programmable Logic Controller (PLC) I/O Module | Medical Instrumentation Front-End |
|
Use Scenario: Modular analog input card acquiring signals from current loops, thermocouples, and potentiometers in industrial control cabinets. IC Role / Device Role / Timing Role: High-channel-count ADC with built-in 14-channel mux and self-test - simplifies firmware-driven channel sequencing and validation. Use Value: Reduces BOM count and layout area versus discrete mux + ADC solutions while supporting diagnostic compliance requirements. |
Use Scenario: Signal conditioning for patient vital sign monitors requiring traceable linearity and repeatable zero/full-scale performance. IC Role / Device Role / Timing Role: Precision 10-bit converter with ±1 LSB total unadjusted error and differential reference inputs for noise-sensitive analog paths. Use Value: Meets Class II medical device accuracy requirements without post-fabrication trimming or calibration firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC1543CDWR | Identical pinout and interface, but includes auto-channel increment mode and enhanced ESD protection (4 kV HBM). | Better suited for systems requiring sequential scanning of multiple channels without repeated address writes. | Select TLC1543CDWR if firmware simplicity and robustness in noisy environments outweigh minor cost increase. |
| ADS7822U | 8-pin MSOP, SPI-compatible, 12-bit resolution, 2.7–5.25 V supply, 2.2 µs conversion time - higher speed and resolution but only 4 analog inputs. | Applicable where higher precision and faster throughput are needed, but channel count is limited to four. | Choose ADS7822U when 12-bit accuracy and sub-µs latency justify reduced input count and different package footprint. |
Compared with TLC1542CDWR, TLC1543CDWR offers identical functionality with added convenience features and ruggedness, while ADS7822U trades channel count and package compatibility for higher resolution and speed - guiding selection based on whether system priority is channel density (TLC1542CDWR), ease of use (TLC1543CDWR), or precision/speed (ADS7822U).
Availability
TLC1542CDWR is available at Aetrix Electronics and suitable for industrial sensor monitoring, programmable logic controller (PLC) I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TLC1542CDWR 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 heritage in precision data converters and industrial-grade ICs.
The TLC1542 series belongs to TI's legacy precision ADC product line, designed specifically for cost-sensitive, medium-speed data acquisition in commercial and industrial systems where channel count, serial interface simplicity, and proven reliability are paramount.
FAQ
What is the maximum sampling rate achievable with the TLC1542CDWR?
The TLC1542CDWR has a fixed conversion time of 21 µs. In fast-mode 10-clock operation with CS toggled per conversion, the minimum cycle time is ~21 µs, yielding a theoretical maximum sampling rate of approximately 47.6 kSPS. Real-world throughput depends on host processor overhead for serial framing and CS handling.
Does the TLC1542CDWR require an external clock source?
No. The TLC1542CDWR incorporates an on-chip system clock that drives the SAR conversion engine. Only the serial I/O CLOCK signal - provided by the host microcontroller - is required for address loading and data transfer. No external crystal or oscillator is needed for basic operation.
Can the TLC1542CDWR perform simultaneous sampling across multiple channels?
No. The TLC1542CDWR uses a single ADC core with a 14-channel multiplexer; it performs sequential sampling. Each conversion is performed on one selected channel (A0–A10 or self-test) per command. True simultaneous sampling requires multiple independent ADCs or a dedicated simultaneous-sampling device.
What is the purpose of the three self-test modes in the TLC1542CDWR?
The TLC1542CDWR's self-test modes (selected via ADDRESS = 1011, 1100, or 1101) output known digital codes corresponding to REF−, REF+, and mid-scale (3FFh). These enable firmware-level verification of ADC functionality, reference integrity, and data path correctness without external test equipment or signal injection.
Is the TLC1542CDWR pin-compatible with the TLC542?
Yes. The TLC1542CDWR is explicitly specified as terminal-compatible with the TLC542. Pin assignments, electrical characteristics, and serial interface timing are functionally identical, allowing direct replacement in existing designs without PCB or firmware modification.
TLC1542CDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 38k
- Number of Inputs:
- 11
- Input Type:
- Single Ended
- 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:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC1542CDWR FAQ
1.How can I place an order for TLC1542CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC1542CDWR 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 TLC1542CDWR reliable?
The price and inventory of TLC1542CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC1542CDWR is usually 5 days.
3.What payment methods are accepted for TLC1542CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC1542CDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC1542CDWR?
TLC1542CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC1542CDWR 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 TLC1542CDWR?
For technical support, including TLC1542CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC1542CDWR requirements.
6.How does Aetrix verify that TLC1542CDWR is sourced from the original manufacturer or authorized distributors?
All TLC1542CDWR 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 TLC1542CDWR meets industry standards.
7.What is the process for return or replacement of TLC1542CDWR?
All TLC1542CDWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC1542CDWR, 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 TLC1542CDWR part is unused and in its original packaging.
Return procedure for TLC1542CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC1542CDWR Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
