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Texas Instruments TLC2558IDW
- Part No.:
- TLC2558IDW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TLC2558IDW.pdf
- Description:
- IC ADC 12BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
TLC2558IDW 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 features hardware/software/auto power-down modes (1 µA max in power-down). It is used in industrial data acquisition systems requiring low-power, multi-channel sampling with programmable sweep sequencing.
For engineers reviewing the TLC2558IDW datasheet, TLC2558IDW pinout, TLC2558IDW application, or TLC2558IDW equivalent, key selection considerations include its 8-channel pseudo-differential capability, configurable sampling period (12/24 SCLK), EOC/INT dual-function pin, FIFO-triggered interrupt levels, and compatibility with TMS320 DSP frame sync protocols.
Technical Context
The TLC2558IDW implements a 12-bit successive-approximation register (SAR) ADC with 2-bit resistor-string DAC and charge-redistribution capacitor array. Its analog multiplexer supports break-before-make switching across eight inputs (A0–A7) or internal test voltages, and sampling can be initiated via CS, FS, or asynchronous CSTART pin.
Conversion timing is derived directly from SCLK (or SCLK/2), enabling 1.6 µs conversion time at 20 MHz. The device supports four conversion modes-single-shot, repeat, sweep, and repeat-sweep-with FIFO-based data buffering and programmable trigger thresholds (1/4 to full FIFO level) for interrupt generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture delivering 1 LSB differential/integral nonlinearity error. |
| Max Throughput | 400 kSPS - achieved using 20 MHz SCLK as conversion clock source. |
| Analog Inputs | 8-channel single-ended or pseudo-differential (A2 serves as MINUS input in pseudo-diff mode). |
| Reference | Internal 4-V reference or external reference (REFP/REFM); supports unipolar binary or 2's complement output format. |
| Power Consumption | 6 mA typical at 5.5 V with internal reference; 1 µA max in hardware power-down mode. |
| FIFO Depth | 8-word deep FIFO with programmable interrupt trigger levels (1/4, 1/2, 3/4, or full). |
| Sampling Control | Programmable short (12 SCLK) or long (24 SCLK) sampling; extended sampling via CSTART pin with user-defined hold time. |
Pinout & Package
The TLC2558IDW is packaged in a 20-pin SOIC (DW) body with 0.3″ width, RoHS-compliant, rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO | Serial Data Output | 3-state MSB-first output for conversion results, CFR reads, or FIFO data; synchronized to SCLK rising/falling edge depending on FS state. |
| SDI | Serial Data Input | MSB-first command/configuration input; first 4 bits decode as 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 (or /2 when configured). |
| EOC/(INT) | End-of-Conversion / Interrupt Output | Configurable pin: EOC only in mode 00; otherwise functions as INT with falling-edge assertion when FIFO reaches programmed threshold. |
| VCC | Positive Supply | Single 5-V supply input; powers analog and digital sections; no separate AVDD/DVDD rails required. |
| A0–A7 | Analog Input Channels | Eight dedicated analog inputs; A2 acts as common-mode reference (MINUS) in pseudo-differential mode. |
| CS | Chip Select | Active-low enable for serial interface; resets internal counter and enables SDI/SDO; doubles as FS when dedicated DSP port unavailable. |
| REFP / REFM | Reference Voltage Terminals | Accept external reference or decouple internal 4-V reference; require 10 µF + 0.1 µF bypass capacitors between them. |
| PWDN | Power-Down Control | Active-low signal disabling analog and reference circuits; device resumes operation after CS or CSTART activation. |
| CSTART | Asynchronous Sampling Trigger | Hardware-controlled start/stop of sampling period; falling edge initiates sampling, rising edge ends sampling and starts conversion. |
Key Features
| Feature | Design Value |
|---|---|
| 8-Channel Analog Multiplexer | Break-before-make switching minimizes inter-channel crosstalk and noise injection during channel sequencing. |
| Programmable Sweep Sequencing | Four auto-sweep patterns (e.g., 0–1–2–3–4–5–6–7 or 0–2–4–6) selectable via CFR bits D4–D3 for flexible multi-channel monitoring. |
| Dual-Mode Sampling | Normal sampling (12/24 SCLK) or extended sampling (CSTART-controlled) accommodates high-impedance sources and variable timing constraints. |
| Flexible Serial Interface | Supports both SPI microcontrollers (CS-triggered, rising-edge SCLK) and TMS320 DSPs (FS-triggered, falling-edge SCLK) without external logic. |
| Low-Power Operation | 1 µA max standby current with hardware power-down; software-configurable conversion speed and sampling duration reduce average system power. |
Applications
| Industrial Sensor Monitoring | Motor Control Feedback |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and current sensors across multiple zones in PLC-based control cabinets. IC Role / Device Role / Timing Role: TLC2558IDW performs synchronized 8-channel sampling with programmable sweep and FIFO buffering to feed real-time feedback to an ARM Cortex-M4 controller. Use Value: Reduces host processor polling overhead via FIFO-triggered interrupts and eliminates need for external multiplexer timing logic. | Use Scenario: Acquisition of phase currents and DC bus voltage in three-phase inverter drives operating at 10–20 kHz PWM frequencies. IC Role / Device Role / Timing Role: TLC2558IDW captures synchronized analog samples using CSTART-triggered extended sampling to avoid PWM noise coupling during current sensing windows. Use Value: Enables precise current reconstruction with <0.5 LSB settling error despite >1 kΩ source impedance from shunt amplifiers. |
| Energy Metering Front-End | Test & Measurement Equipment |
Use Scenario: Multi-point voltage/current measurement in Class 0.5 polyphase energy meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: TLC2558IDW digitizes isolated sensor outputs using internal 4-V reference and pseudo-differential mode to reject common-mode noise from CT/PT interfaces. Use Value: Achieves 69 dB SNDR at 12 kHz input frequency, meeting harmonic analysis requirements for metering accuracy. | Use Scenario: Portable handheld oscilloscopes and waveform analyzers requiring low-power, multi-channel analog capture with minimal board space. IC Role / Device Role / Timing Role: TLC2558IDW serves as front-end ADC with FIFO-based burst capture, triggered by external event signals routed to CSTART. Use Value: Supports 400 kSPS sustained sampling over 8 channels without host CPU bottleneck, enabling real-time display updates. |
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, no FIFO, SPI-only interface (no FS support). | Limited to lower-accuracy, lower-throughput applications where DSP frame sync or FIFO buffering is unnecessary. | Select when cost sensitivity outweighs resolution and feature requirements; not suitable for direct replacement due to missing FIFO and reference. |
| ADS8320EB | 16-bit resolution, 100 kSPS, no internal reference, no FIFO, SPI interface only, higher power (1.5 mA active). | Better resolution but slower throughput; requires external reference and lacks sweep/FIFO features for multi-channel automation. | Choose for precision DC measurements where channel count and speed are secondary; incompatible with TLC2558IDW's sweep sequencing or power-down modes. |
Compared with ADS7822U and ADS8320EB, the TLC2558IDW uniquely combines 12-bit resolution, 400 kSPS throughput, integrated FIFO, programmable sweep, and dual-mode serial interface - making it optimal for embedded industrial systems needing balanced performance, flexibility, and low power.
Availability
TLC2558IDW is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, energy metering front-ends, and portable test equipment requiring stable component supply across extended temperature ranges.
Supply support for TLC2558IDW 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 TLC2558IDW belongs to TI's legacy precision SAR ADC product line, designed specifically for low-power, multi-channel industrial data acquisition where integration, flexibility, and reliability are critical.
FAQ
What is the maximum sampling rate supported by the TLC2558IDW?
The TLC2558IDW achieves a maximum throughput of 400 kSPS when operated with a 20 MHz SCLK used as the conversion clock source. This rate assumes normal sampling mode with short (12 SCLK) sampling period and no FIFO read overhead. Actual sustained rate depends on host interface timing and FIFO management efficiency.
Does the TLC2558IDW require an external reference voltage?
No, the TLC2558IDW includes an internal 4-V reference that can be enabled via CFR bit D11 = 1. An external reference may be applied between REFP and REFM terminals for improved accuracy or custom voltage scaling, but it is not required for basic operation.
How does the CSTART pin function in the TLC2558IDW?
The CSTART pin provides asynchronous control of sampling: a falling edge initiates sampling, and a rising edge ends sampling and starts conversion. This allows precise timing alignment independent of SCLK, essential for capturing clean samples in noisy environments like motor drive current sensing.
Can the TLC2558IDW interface directly with a TMS320 DSP?
Yes, the TLC2558IDW supports direct TMS320 DSP interfacing via its FS (frame sync) pin. When FS is active, data is shifted on falling SCLK edges and output changes on rising SCLK edges - matching standard DSP serial port timing without glue logic.
What are the valid conversion modes available on the TLC2558IDW?
The TLC2558IDW supports four conversion modes defined by CFR bits D6–D5: Mode 00 (one-shot), Mode 01 (repeat), Mode 10 (sweep), and Mode 11 (repeat sweep). Each mode determines how channels are selected, whether FIFO is used, and how interrupts are generated upon FIFO threshold crossing.
TLC2558IDW 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC2558IDW FAQ
1.How can I place an order for TLC2558IDW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2558IDW 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 TLC2558IDW reliable?
The price and inventory of TLC2558IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2558IDW is usually 5 days.
3.What payment methods are accepted for TLC2558IDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2558IDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2558IDW?
TLC2558IDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2558IDW 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 TLC2558IDW?
For technical support, including TLC2558IDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2558IDW requirements.
6.How does Aetrix verify that TLC2558IDW is sourced from the original manufacturer or authorized distributors?
All TLC2558IDW 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 TLC2558IDW meets industry standards.
7.What is the process for return or replacement of TLC2558IDW?
All TLC2558IDW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2558IDW, 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 TLC2558IDW part is unused and in its original packaging.
Return procedure for TLC2558IDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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