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Texas Instruments TLC2558IPW
- Part No.:
- TLC2558IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC2558IPW.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,320
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Product details
Overview
TLC2558IPW from Texas Instruments is a 12-bit, 400 kSPS, 8-channel serial analog-to-digital converter (ADC) with built-in 4-V reference, 8× FIFO, and SPI/DSP-compatible interface. It operates from a single 5-V supply, supports pseudo-differential or single-ended inputs, and features hardware- and software-controllable power-down modes (1 µA max). It is used in industrial data acquisition systems requiring low-power, multi-channel sampling with deterministic timing.
For engineers reviewing the TLC2558IPW datasheet, TLC2558IPW pinout, TLC2558IPW application, or TLC2558IPW equivalent, key selection considerations include its 8-channel multiplexing capability, programmable sweep sequencing, extended sampling via CSTART, FIFO-triggered interrupt behavior, and compatibility with both microcontroller SPI and TMS320 DSP frame-sync interfaces.
Technical Context
The TLC2558IPW implements a 12-bit successive-approximation register (SAR) ADC with a 2-bit resistor-string DAC and charge-redistribution capacitor array. Conversion clock is derived directly from SCLK (up to 20 MHz), enabling 1.6 µs conversion time. Sampling period is programmable (12 or 24 SCLK cycles) or fully asynchronous via CSTART pin.
It integrates an 8-input analog multiplexer with break-before-make switching, on-chip 4-V reference (selectable via CFR.D11), and configurable output format (unipolar binary or 2's complement). Four conversion modes-single-shot, repeat, sweep, and repeat-sweep-are controlled by CFR bits D6–D5, with FIFO trigger levels set by CFR.D1–D0.
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 when enabled). |
| FIFO Depth | 8-word deep FIFO with programmable interrupt trigger at 1/4, 1/2, 3/4, or full level. |
| Reference | Internal 4-V reference or external reference (REFP/REFM pins); selectable via CFR.D11. |
| Power Modes | Software/hardware/auto power-down; 1 µA max quiescent current in external-ref power-down mode. |
| Interface | SPI/DSP-compatible 4-wire serial interface (CS, SCLK, SDI, SDO) with optional FS frame sync. |
Pinout & Package
Package: 20-pin TSSOP (PW), 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 of conversion result or configuration register; active only during CS low. |
| SDI | Serial data input | Accepts 16-bit command/configuration words (MSB first); supports both rising- and falling-edge clocking depending on FS state. |
| SCLK | Serial clock input | Drives internal shift register and serves as conversion clock source (up to 20 MHz); determines sampling duration when in normal mode. |
| 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. |
| CS | Chip select | Active-low enable; resets internal counter, enables SDI, and releases SDO from high-impedance state. |
| A0–A7 | Analog input channels | Eight single-ended inputs; A2 functions as pseudo-differential MINUS input when CFR.D7 = 1. |
| CSTART | Asynchronous sampling control | High-to-low edge initiates sampling; low-to-high edge ends sampling and starts conversion - independent of SCLK timing. |
| PWDN | Power-down control | Logic-low disables analog and reference circuits; device resumes operation on next active CS or CSTART edge. |
| REFP / REFM | Reference voltage terminals | Support external reference (differential pair) or decouple internal 4-V reference; require 10 µF + 0.1 µF bypass capacitors. |
| FS | Frame sync input | Indicates start of serial data frame for DSP interfacing; replaces CS functionality when active (FS = 0). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable auto-channel sweep | Four configurable sequences (e.g., 0–1–2–3–4–5–6–7 or 0–2–4–6–0–2–4–6) enable flexible sensor polling without host intervention. |
| Extended sampling via CSTART | Hardware-controlled sampling window allows precise timing alignment with external signal conditioning or settling requirements. |
| 8× FIFO with interrupt trigger | Reduces host CPU overhead by buffering up to eight conversions and generating INT at user-defined fill levels (1/4 to full). |
| Dual reference support | Internal 4-V reference simplifies BOM; external reference option enables precision scaling for varying input ranges or accuracy needs. |
| Low-power operation | 4 mA typical operating current (5.5 V, external ref); drops to ≤1 µA in power-down mode - critical for battery-powered DAQ systems. |
Applications
| Industrial Sensor Data Acquisition | Motor Control Feedback Monitoring |
|---|---|
Use Scenario: Simultaneous sampling of temperature, pressure, and current sensors across eight analog channels in PLC I/O modules. IC Role / Device Role / Timing Role: Central 12-bit ADC performing synchronized channel sweeps with FIFO buffering and interrupt-driven data retrieval. Use Value: Eliminates need for external multiplexer and timing logic; reduces firmware complexity through programmable sweep sequences and automatic FIFO management. | Use Scenario: Real-time monitoring of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: High-accuracy ADC capturing synchronized current samples with <1.6 µs conversion time and extended sampling for anti-aliasing filter settling. Use Value: Enables precise current reconstruction and overcurrent protection with minimal latency; CSTART pin allows tight synchronization with PWM dead-time intervals. |
| Portable Test Equipment | Energy Metering Front-End |
Use Scenario: Battery-powered handheld multimeter acquiring voltage, resistance, and diode test readings across multiple ranges. IC Role / Device Role / Timing Role: Low-power ADC with auto power-down and software-triggered conversions conserving energy between measurements. Use Value: Achieves >100-hour battery life using 1 µA power-down current and on-demand wake-up via CS or CSTART. | Use Scenario: Multi-tariff electricity meter measuring voltage, current, and neutral current with harmonic analysis capability. IC Role / Device Role / Timing Role: Precision ADC providing 12-bit resolution and 69 dB SNDR at 12 kHz for accurate RMS and THD calculation. Use Value: Meets IEC 62053-21 Class 0.5 accuracy requirements without external op-amp gain stages due to integrated reference and low INL. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI-only interface; no FIFO; no internal reference; 200 kSPS max throughput. | Lacks programmable sweep and FIFO buffering; requires external reference and separate timing control. | Choose for cost-sensitive, lower-throughput designs where host handles all sequencing and buffering. |
| MCP3208-CI/P | 8-channel, 12-bit, SPI interface; no internal reference; no CSTART or FS; 100 kSPS max throughput. | No extended sampling, no frame-sync support, no auto-sweep; simpler command set and no FIFO interrupt triggers. | Prefer for basic microcontroller-based systems needing minimal feature set and wide temperature availability (–40°C to +85°C). |
Compared with ADS7822U and MCP3208-CI/P, the TLC2558IPW delivers higher throughput (400 kSPS), integrated FIFO with configurable interrupt, internal reference, and dual-mode sampling control - making it uniquely suited for real-time, low-latency, multi-channel industrial DAQ where deterministic timing and reduced host load are critical.
Availability
TLC2558IPW is available at Aetrix Electronics and suitable for industrial sensor acquisition, motor control feedback monitoring, portable test equipment, and energy metering front-end applications requiring stable component supply and long-term lifecycle support.
Supply support for TLC2558IPW 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The TLC2558IPW belongs to TI's legacy high-performance SAR ADC product line, engineered specifically for industrial data acquisition systems demanding low power, multi-channel flexibility, and robust serial interfacing with microcontrollers and DSPs.
FAQ
What is the maximum sampling rate supported by the TLC2558IPW?
The TLC2558IPW achieves a maximum throughput of 400 kSPS when using a 20-MHz SCLK as the conversion clock source. This performance assumes optimal conditions including short sampling period (12 SCLKs), internal reference, and single-channel repeat mode. Actual sustained rate depends on selected conversion mode, FIFO usage, and host interface timing overhead.
Does the TLC2558IPW require an external reference voltage?
No, the TLC2558IPW includes an internal 4-V reference that can be selected via the Configuration Register (CFR.D11 = 1). An external reference may be applied between REFP and REFM for improved accuracy or custom scaling, but it is not required. When using the internal reference, REFP and REFM must be decoupled with 10 µF and 0.1 µF capacitors.
How does the CSTART pin function in the TLC2558IPW?
The CSTART pin provides asynchronous control of sampling in the TLC2558IPW: a high-to-low transition initiates sampling, and a low-to-high transition ends sampling and starts conversion. This allows precise timing alignment independent of SCLK, supporting applications with high source impedance or strict anti-aliasing filter settling requirements. If unused, CSTART must be tied to VCC.
Can the TLC2558IPW operate in pseudo-differential mode?
Yes, the TLC2558IPW supports pseudo-differential input mode by setting CFR.D7 = 1. In this mode, A2 serves as the common-mode (MINUS) input for channels A0–A1 and A3–A7, enabling noise rejection on grounded or low-ripple reference signals. The MINUS input accepts up to ±0.2 V ripple, making it suitable for ground-referenced sensor bridges or isolated amplifier outputs.
What are the four conversion modes available in the TLC2558IPW?
The TLC2558IPW offers four conversion modes controlled by CFR bits D6–D5: (00) Single-shot - one conversion per command; (01) Repeat - continuous conversions on a single channel with FIFO buffering; (10) Sweep - sequential conversions across a programmed channel list; and (11) Repeat sweep - repeated full sweeps with optional FIFO overflow handling. Each mode supports both normal (SCLK-timed) and extended (CSTART-timed) sampling.
TLC2558IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC2558IPW FAQ
1.How can I place an order for TLC2558IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2558IPW 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 TLC2558IPW reliable?
The price and inventory of TLC2558IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2558IPW is usually 5 days.
3.What payment methods are accepted for TLC2558IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2558IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2558IPW?
TLC2558IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2558IPW 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 TLC2558IPW?
For technical support, including TLC2558IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2558IPW requirements.
6.How does Aetrix verify that TLC2558IPW is sourced from the original manufacturer or authorized distributors?
All TLC2558IPW 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 TLC2558IPW meets industry standards.
7.What is the process for return or replacement of TLC2558IPW?
All TLC2558IPW units undergo pre-shipment inspection (PSI). If there is an issue with TLC2558IPW, 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 TLC2558IPW part is unused and in its original packaging.
Return procedure for TLC2558IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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