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Texas Instruments TLC2554CPW
- Part No.:
- TLC2554CPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
TLC2554CPW.pdf
- Description:
- SAR ADC, 12-BIT, SERIAL ACCESS
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Product details
Overview
TLC2554CPW from Texas Instruments is a 12-bit, 4-channel, serial analog-to-digital converter (ADC) operating from a single 5-V supply with 400 kSPS maximum throughput, ±1 LSB differential/integral nonlinearity, and built-in 4-V reference - used in industrial data acquisition systems requiring low-power, SPI/DSP-compatible digitization of sensor signals.
For engineers reviewing the TLC2554CPW datasheet, TLC2554CPW pinout, TLC2554CPW application, or TLC2554CPW equivalent, this page delivers verified technical context, validated pin functions, confirmed FIFO and auto-sweep operation, real-world sampling timing constraints, and precise alternative selection guidance for embedded measurement designs.
Technical Context
The TLC2554CPW implements a 12-bit successive-approximation register (SAR) ADC with a 2-bit resistor-string DAC and charge-redistribution capacitor array. It supports both normal sampling (12 or 24 SCLK cycles) and asynchronous extended sampling via the CSTART pin, enabling precise control over acquisition time for high-impedance sources.
It integrates an 8-deep FIFO, programmable conversion modes (one-shot, repeat, sweep, repeat-sweep), and dual serial interface support: SPI-compatible (CS/SCLK/SDI/SDO) and TMS320 DSP-compatible (FS/SCLK/SDI/SDO), with EOC/INT pin configurable via CFR bit D2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture delivering 1 LSB accuracy with ±1 LSB DNL/INL - ensures monotonicity and predictable code transitions in precision measurement. |
| Max Throughput | 400 kSPS at 20 MHz SCLK - enables real-time capture of signals up to ~195 kHz Nyquist bandwidth. |
| Analog Input Range | 0 V to VCC (5 V) with 500 kHz input bandwidth - supports direct connection to unipolar sensors without external level-shifting. |
| Reference | Internal 4-V reference or external reference (REFP/REFM pins) - provides flexibility for accuracy-critical applications requiring stable voltage references. |
| Power Consumption | 6 mA at 5.5 V with internal reference; 1 µA max in hardware power-down mode - enables battery-operated or energy-constrained systems. |
| Serial Interface | SPI/DSP-compatible 4-wire interface (SCLK up to 20 MHz, CS/FS-triggered) - interoperates with microcontrollers and TMS320-series DSPs without protocol translation. |
| FIFO Depth | 8-word deep FIFO with programmable interrupt thresholds (1/4, 1/2, 3/4, full) - reduces host CPU overhead during multi-channel burst acquisition. |
Pinout & Package
Package: 16-pin TSSOP (PW), RoHS-compliant, 5 mm × 4.4 mm footprint, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO | Serial Data Output | 3-state MSB-first output for conversion results or CFR contents; driven only when CS is active and after command decode. |
| SDI | Serial Data Input | MSB-first command/configuration input (D15–D12 = command, D11–D0 = data); latched on rising (SPI) or falling (DSP) SCLK edges. |
| SCLK | Serial Clock Input | Up to 20 MHz clock source used for both serial I/O and internal conversion timing - eliminates need for separate ADC clock generator. |
| EOC/(INT) | End-of-Conversion / Interrupt Output | Configurable as EOC (mode 00 only) or INT (all other modes); asserts on conversion completion or FIFO threshold breach. |
| VCC | Positive Supply | Single 5-V supply powering analog and digital sections; no separate AVDD/DVDD required. |
| A0–A3 | Analog Inputs | Four single-ended or pseudo-differential analog inputs; A1 serves as MINUS input in pseudo-diff mode - supports noise-rejecting measurements. |
| CS | Chip Select | Active-low enable for serial interface; resets internal counter and enables SDI/SDO - also usable as FS when interfacing with TMS320 DSP. |
| REFP / REFM | Reference Inputs | Differential reference terminals; accept internal 4-V reference or external reference (e.g., precision bandgap or REF50xx). |
| PWDN | Power-Down Control | Hardware power-down input; pulls analog and reference circuits into 1 µA standby - complements software power-down for lowest system idle current. |
| CSTART | Asynchronous Sampling Trigger | Edge-controlled sampling start/hold; falling edge initiates sampling, rising edge starts conversion - essential for deterministic timing with high-Z sources. |
| GND | Analog/Digital Ground | Common return for all circuitry; requires low-impedance connection to minimize noise coupling into SAR core. |
| FS | Frame Sync Input | DSP frame synchronization signal; used instead of CS to trigger conversions in TMS320 interfaces - enables seamless integration with TI's C5x/C6x serial ports. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sampling Period | Short (12 SCLK) or long (24 SCLK) normal sampling, plus CSTART-driven extended sampling - accommodates source impedances >1 kΩ without external op-amp buffering. |
| Auto Channel Sweep | Configurable 4-channel sequence (0–1–2–3, 0–0–1–1, etc.) with FIFO-triggered interrupts - enables compact firmware for multi-sensor polling without host intervention. |
| On-Chip Analog Multiplexer | 4-input MUX with break-before-make switching and three internal test voltages ((REFP+REFM)/2, REFP, REFM) - simplifies calibration and fault detection in field-deployed systems. |
| Flexible Reference Architecture | Selectable internal 4-V reference or external reference via CFR bit D11 - maintains 12-bit performance across varying supply conditions and accuracy requirements. |
| Multiple Conversion Modes | One-shot, repeat, sweep, and repeat-sweep modes controlled by CFR bits D6–D5 - allows runtime adaptation between single-point reads and continuous channel monitoring. |
Applications
| Industrial Sensor Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and humidity sensor outputs in factory-floor PLC modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC handling four analog sensor channels with automatic sweep and FIFO buffering to reduce MCU polling frequency. Use Value: Enables deterministic 400 kSPS aggregate throughput with <1 µA power-down current during idle periods - extends system uptime and simplifies thermal management. | Use Scenario: Battery-powered environmental monitoring units logging soil moisture, light intensity, and ambient CO₂ over days. IC Role / Device Role / Timing Role: Low-power ADC managing sensor sequencing and burst-mode conversion triggered by wake-up timers or external events. Use Value: Delivers 6 mA active current (internal ref) and 1 µA hardware shutdown - directly extends battery life while maintaining 12-bit resolution across operating temperature range. |
| Test & Measurement Front Ends | Motor Control Feedback Systems |
Use Scenario: Signal conditioning stage in handheld multimeters and oscilloscope probes digitizing DC/AC waveforms. IC Role / Device Role / Timing Role: Precision ADC with pseudo-differential input mode rejecting ground noise from shared sensor/power returns. Use Value: Achieves ±1 LSB INL/DNL and 69 dB SNDR at 12 kHz - meets Class II metering accuracy requirements without external calibration. | Use Scenario: Current/voltage sensing in BLDC motor drives where phase currents must be sampled synchronously with PWM cycles. IC Role / Device Role / Timing Role: ADC synchronized to motor controller via CSTART pin for exact sampling window placement relative to PWM dead time. Use Value: Extended sampling via CSTART ensures full settling of current-sense amplifier outputs before conversion - eliminates aliasing in torque ripple analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, SPI-only interface, no FIFO, no internal reference | Lower resolution and throughput; suited for cost-sensitive, non-critical sensing where 12-bit fidelity is unnecessary | Select ADS7822U only if 8-bit resolution suffices and FIFO/auto-sweep features are not required. |
| MCP3204-I/P | 12-bit resolution, 100 kSPS, SPI-only, no internal reference, no CSTART or FS support | Limited speed and interface flexibility; lacks extended sampling and DSP sync - best for simple microcontroller-based readouts | Choose MCP3204-I/P when design uses only SPI, does not require CSTART timing control, and can provide external reference. |
Compared with TLC2554CPW, ADS7822U trades resolution and FIFO capability for lower cost and smaller footprint, while MCP3204-I/P retains 12-bit accuracy but sacrifices throughput, sampling flexibility, and integrated reference - making TLC2554CPW optimal for demanding, multi-mode industrial digitization.
Availability
TLC2554CPW is available at Aetrix Electronics and suitable for industrial sensor monitoring, portable data loggers, test equipment front ends, and motor control feedback systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC2554CPW 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 power management technologies, with decades of heritage in precision data converters.
The TLC2554CPW belongs to TI's legacy precision SAR ADC product line, designed specifically for low-power, multi-channel industrial measurement systems requiring flexible serial interfacing and deterministic sampling control.
FAQ
What is the maximum sampling rate supported by the TLC2554CPW?
The TLC2554CPW achieves a maximum throughput of 400 kSPS when operated with a 20 MHz SCLK. This rate assumes optimal configuration - short sampling period (12 SCLKs), internal reference, and one-shot mode. Real-world sustained rates may be lower depending on FIFO management, conversion mode, and source impedance effects on settling time.
Does the TLC2554CPW include an internal voltage reference?
Yes, the TLC2554CPW integrates a 4-V internal reference that can be selected via CFR bit D11. When enabled, it eliminates the need for an external reference component. The device also supports external reference configurations using the REFP and REFM pins for higher accuracy or custom voltage scaling.
How many analog input channels does the TLC2554CPW support?
The TLC2554CPW supports four analog input channels (A0–A3). In pseudo-differential mode, A1 serves as the common-mode (MINUS) input, leaving three usable single-ended channels. This differs from the TLC2558CPW, which offers eight channels (A0–A7).
Can the TLC2554CPW interface directly with a TMS320 DSP?
Yes, the TLC2554CPW supports direct TMS320 DSP interfacing via its FS (frame sync) pin and falling-edge SCLK data capture. When FS is used as the trigger, the device enters DSP-compatible mode - accepting commands and outputting data aligned to the DSP's frame boundary without requiring additional glue logic.
What is the function of the CSTART pin on the TLC2554CPW?
The CSTART pin on the TLC2554CPW provides hardware-controlled extended sampling: a falling edge initiates analog input sampling, and a rising edge terminates sampling and starts conversion. This decouples sampling timing from SCLK, enabling precise acquisition windows for high-impedance or noisy signal sources - a capability not available in standard SPI-mode operation.
TLC2554CPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
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- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
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- Qualification:
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TLC2554CPW FAQ
1.How can I place an order for TLC2554CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2554CPW 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 TLC2554CPW reliable?
The price and inventory of TLC2554CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2554CPW is usually 5 days.
3.What payment methods are accepted for TLC2554CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2554CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2554CPW?
TLC2554CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2554CPW 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 TLC2554CPW?
For technical support, including TLC2554CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2554CPW requirements.
6.How does Aetrix verify that TLC2554CPW is sourced from the original manufacturer or authorized distributors?
All TLC2554CPW 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 TLC2554CPW meets industry standards.
7.What is the process for return or replacement of TLC2554CPW?
All TLC2554CPW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2554CPW, 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 TLC2554CPW part is unused and in its original packaging.
Return procedure for TLC2554CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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