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Texas Instruments TLC2558CDW
- Part No.:
- TLC2558CDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC2558CDW.pdf
- Description:
- IC ADC 12BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,306
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Product details
Overview
TLC2558CDW from Texas Instruments is a 12-bit, 400 kSPS serial analog-to-digital converter (ADC) with 8-channel analog multiplexer, built-in 4-V reference, and 8× FIFO buffer. It operates from a single 5-V supply, supports SPI/DSP-compatible serial interface up to 20 MHz SCLK, and delivers ±1 LSB differential/integral nonlinearity for precision data acquisition in industrial sensor interfaces.
For engineers reviewing the TLC2558CDW datasheet, TLC2558CDW pinout, TLC2558CDW application, or TLC2558CDW equivalent, key selection considerations include its programmable sampling period (12/24 SCLK), hardware/software/auto power-down modes (1 µA max), pseudo-differential input capability, and sweep-mode channel sequencing for multi-sensor monitoring systems.
Technical Context
The TLC2558CDW implements a 12-bit successive-approximation register (SAR) architecture with 2-bit resistor-string DAC and charge-redistribution sampling. Its analog multiplexer selects among eight single-ended or pseudo-differential inputs (A0–A7), with A2 serving as the dedicated MINUS input in pseudo-differential mode.
Conversion timing is fully configurable: normal sampling uses 12 or 24 SCLK cycles, while extended sampling is triggered asynchronously via CSTART pin with user-defined hold time. The device supports four conversion modes-single-shot, repeat, sweep, and repeat-sweep-with FIFO-triggered interrupt generation and programmable threshold levels (1/4 to full).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with ±1 LSB DNL/INL - ensures monotonicity and accurate code transitions across full scale. |
| Throughput | 400 kSPS maximum - achieved using 20-MHz SCLK as conversion clock source, enabling real-time signal capture. |
| Analog Inputs | 8-channel single-ended or pseudo-differential (A0–A7) - A2 serves as common MINUS input; supports up to ±0.2 V ripple on MINUS line. |
| Reference | Internal 4-V reference or external REFP/REFM - provides flexibility for accuracy-critical applications without external reference ICs. |
| Power Modes | Software/hardware/auto power-down (1 µA max) - enables ultra-low-power operation during idle periods in battery-powered systems. |
| FIFO Depth | 8-word × 12-bit buffer - decouples host processor timing from conversion rate, supporting burst reads and deterministic latency. |
| Interface | SPI/DSP-compatible 4-wire serial (SDI/SDO/SCLK/CS or FS) - supports both microcontroller and TMS320 DSP host integration with frame-sync option. |
Pinout & Package
Package: 20-pin SOIC (DW) - surface-mount, 0.300-inch wide body, RoHS-compliant, rated for 0°C to 70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO | Serial Data Output | 3-state MSB-first output for conversion results, CFR, or FIFO data; tri-stated when CS is high or after 16th bit. |
| SDI | Serial Data Input | MSB-first command/configuration input; first 4 bits decode command (e.g., channel select, FIFO read, CFR write). |
| SCLK | Serial Clock Input | Host-provided clock up to 20 MHz; serves as both interface clock and conversion clock source (configurable). |
| EOC/(INT) | End-of-Conversion / Interrupt | Programmable as EOC (mode 00 only) or INT (all other modes); falling edge signals ready data in FIFO or conversion completion. |
| VCC | Positive Supply | Single 5-V DC supply; powers analog and digital sections; internal regulator stabilizes reference circuitry. |
| A0–A7 | Analog Input Channels | Eight multiplexed inputs; A2 is fixed MINUS input in pseudo-differential mode; all support 0–VCC range with 500-kHz BW. |
| CS | Chip Select | Active-low enable; resets internal counter, enables SDI, and releases SDO from 3-state; doubles as FS when dedicated serial port used. |
| REFP / REFM | Reference Inputs | External reference terminals; accept 0–VCC differential range; require 10 µF + 0.1 µF decoupling between pins. |
| PWDN | Power-Down Control | Active-low global disable; powers down analog and reference circuits; device resumes on next active CS or CSTART edge. |
| CSTART | Asynchronous Sampling Trigger | Hardware-controlled start/stop of sampling period; falling edge initiates sample, rising edge initiates conversion - bypasses SCLK dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sampling Period | 12 or 24 SCLK cycles (normal) or user-defined via CSTART pin - accommodates high-impedance sensors and variable MUX ON-resistance. |
| Auto Channel Sweep | Four selectable sequences (e.g., 0–1–2–3–4–5–6–7 or 0–2–4–6) with FIFO-triggered interrupt - enables unattended multi-point monitoring. |
| Flexible Reference Options | Internal 4-V reference or external differential reference - eliminates need for external voltage reference IC in cost-sensitive designs. |
| Low-Power Operation | 4 mA typical at 5.5 V with external reference; 1 µA max in power-down - extends battery life in portable instrumentation. |
| DSP/MCU Interface Compatibility | FS pin support for TMS320 DSP frame sync; CS double-functionality - simplifies integration across heterogeneous host platforms. |
Applications
| Industrial Sensor Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition from eight temperature, pressure, and humidity sensors in factory automation panels. IC Role / Device Role / Timing Role: 8-channel SAR ADC with auto-sweep mode and FIFO buffering - performs sequential conversions without CPU intervention. Use Value: Reduces host processor load by 75% compared to polled single-channel ADCs; FIFO-triggered interrupts ensure no sample loss at 400 kSPS aggregate rate. | Use Scenario: Battery-powered environmental logger capturing analog sensor data over 72-hour deployments. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with software/hardware power-down - enters 1 µA sleep state between measurement bursts. Use Value: Extends operational lifetime to >12 months on two AA cells by minimizing active current (4 mA) and deep-sleep current (1 µA). |
| Motor Control Feedback Systems | Test & Measurement Equipment |
Use Scenario: Real-time sampling of phase currents and bus voltage in 3-phase inverter drives. IC Role / Device Role / Timing Role: Pseudo-differential ADC with A2 as common-mode rejection input - measures current shunt voltages referenced to noisy motor ground. Use Value: Achieves ±0.2 V ripple tolerance on MINUS input, enabling accurate current sensing despite high dv/dt noise in IGBT switching environments. | Use Scenario: Modular benchtop oscilloscope front-end acquiring synchronized multi-channel waveforms. IC Role / Device Role / Timing Role: High-speed serial ADC with 20-MHz SCLK interface - streams 12-bit samples directly to FPGA memory via SPI. Use Value: Eliminates parallel bus routing congestion; 400 kSPS throughput meets 100-kHz signal bandwidth requirements per channel with Nyquist margin. |
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, no internal reference, 6-channel mux | Limited to lower-accuracy sensor digitization where 12-bit precision is not required | Select when cost sensitivity outweighs resolution needs and external reference is acceptable |
| MCP3208-I/P | 12-bit, 100 kSPS, SPI-only (no FS), no FIFO, no auto-sweep | Suitable for simpler microcontroller-based systems lacking DSP integration or burst acquisition needs | Choose for basic 8-channel acquisition where FIFO buffering and sweep sequencing are unnecessary |
Compared with ADS7822U and MCP3208-I/P, the TLC2558CDW uniquely combines 12-bit precision, 400 kSPS throughput, integrated FIFO, and programmable auto-sweep - making it optimal for high-fidelity, multi-sensor, low-power embedded data acquisition where deterministic latency and host offload are critical.
Availability
TLC2558CDW is available at Aetrix Electronics and suitable for industrial sensor monitoring, portable data loggers, motor control feedback systems, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for TLC2558CDW 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 TLC2558CDW belongs to TI's legacy precision SAR ADC product line, designed specifically for low-power, multi-channel data acquisition in industrial automation, instrumentation, and embedded control systems.
FAQ
What is the maximum sampling rate supported by the TLC2558CDW?
The TLC2558CDW achieves a maximum throughput of 400 kSPS when using a 20-MHz SCLK as the conversion clock source. This rate is sustained across all eight analog input channels in sweep mode with FIFO buffering, and is confirmed in the SLAS220A datasheet under "Maximum Throughput." The actual achievable rate depends on SCLK frequency, sampling period configuration (12 vs. 24 SCLKs), and selected conversion mode.
Does the TLC2558CDW require an external reference voltage?
No, the TLC2558CDW does not require an external reference voltage because it integrates a precise 4-V internal reference. However, it supports optional external differential reference inputs (REFP/REFM) for applications demanding higher accuracy or custom full-scale ranges. When using the internal reference, REFP and REFM must be connected appropriately per the datasheet decoupling guidelines.
How many analog input channels does the TLC2558CDW support in pseudo-differential mode?
In pseudo-differential mode, the TLC2558CDW supports seven usable analog input channels (A0, A1, A3, A4, A5, A6, A7), with A2 fixed as the common MINUS input. This configuration is enabled by setting CFR.D7 = 1. The MINUS input tolerates up to ±0.2 V ripple, making it suitable for ground-noise rejection in noisy motor or power-conversion environments.
What is the function of the CSTART pin on the TLC2558CDW?
The CSTART pin on the TLC2558CDW provides asynchronous control of the sampling period: a high-to-low transition initiates sampling, and a low-to-high transition ends sampling and starts conversion. This extended sampling mode bypasses SCLK dependency, allowing precise timing control for high-impedance sources or variable MUX resistance - critical for maintaining 0.5 LSB accuracy in demanding sensor applications.
Can the TLC2558CDW operate with a supply voltage other than 5 V?
The TLC2558CDW is specified for single-supply operation at 5 V DC only. The datasheet states "Single Supply 5 Vdc" and defines all electrical characteristics - including INL/DNL, SNR, and power consumption - at 5 V. Operation outside this rating is not guaranteed and may result in degraded performance or functional failure. No 3.3-V or dual-supply variants exist within the TLC2558 family.
TLC2558CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 7, 8
- Input Type:
- Pseudo-Differential, 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, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC2558CDW FAQ
1.How can I place an order for TLC2558CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2558CDW 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 TLC2558CDW reliable?
The price and inventory of TLC2558CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2558CDW is usually 5 days.
3.What payment methods are accepted for TLC2558CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2558CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2558CDW?
TLC2558CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2558CDW 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 TLC2558CDW?
For technical support, including TLC2558CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2558CDW requirements.
6.How does Aetrix verify that TLC2558CDW is sourced from the original manufacturer or authorized distributors?
All TLC2558CDW 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 TLC2558CDW meets industry standards.
7.What is the process for return or replacement of TLC2558CDW?
All TLC2558CDW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2558CDW, 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 TLC2558CDW part is unused and in its original packaging.
Return procedure for TLC2558CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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