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Texas Instruments TLC2574IN
- Part No.:
- TLC2574IN
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
TLC2574IN.pdf
- Description:
- SAR ADC, 12-BIT, SERIAL ACCESS
- Quantity:
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Product details
Overview
TLC2574IN from Texas Instruments is a 12-bit, 4-channel single-ended SAR analog-to-digital converter (ADC) with SPI/DSP-compatible serial interface, ±10 V bipolar input range, 200-KSPS maximum throughput, and integrated 8-word FIFO. It operates from a single 5-V analog supply and 3-/5-V digital supply, targeting precision data acquisition in industrial process control and test equipment.
For engineers reviewing the TLC2574IN datasheet, TLC2574IN pinout, TLC2574IN application, or TLC2574IN equivalent, key selection considerations include its 12-bit resolution with ±0.7 LSB INL (N package), hardware-configurable sampling modes (normal/short/extended), CSTART-triggered asynchronous sampling, and compatibility with both SPI and DSP serial protocols using CS or FS initiation.
Technical Context
The TLC2574IN implements a successive-approximation register (SAR) architecture with on-chip analog multiplexer supporting four single-ended inputs (A0–A3), internal conversion clock (6.5 MHz oscillator), and programmable autochannel sweep. Its signal chain includes bipolar input scaling, sample-and-hold with configurable acquisition time (1.2 µs short / 44 SCLK long), and 12-bit unipolar/bipolar output formatting.
Serial communication supports dual-mode operation: CS-initiated SPI (CS as slave select) and FS-initiated DSP interface (FS as frame sync). The device features EOC/INT output for host interrupt signaling, 3-state SDO with MSB-first output, and hardware default mode when SDI is tied to DVDD - enabling configuration-free startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 12-bit linear output codes with no missing codes guaranteed. |
| Input Channels | 4 single-ended (A0–A3) - supports multiplexed acquisition from four independent analog sources. |
| Analog Input Range | ±10 V bipolar - enables direct measurement of industrial sensor outputs without external level-shifting. |
| Throughput Rate | 200 KSPS - achieves full 12-bit conversion at up to 200,000 samples per second in fixed-channel mode. |
| INL (N package) | ±0.7 LSB - ensures high DC accuracy for calibration-critical applications like instrumentation front-ends. |
| Power Consumption | 5.8 mA normal / 20 µA power-down - supports low-power operation in battery-backed or energy-conscious systems. |
| SINAD (20 kHz) | 72 dB typical - provides >11.7 effective bits for medium-bandwidth signal digitization (e.g., audio, vibration). |
| Serial Interface | SPI/DSP-compatible - interoperates with TI C2000, ARM Cortex-M, and FPGA controllers via CS or FS initiation. |
Pinout & Package
Package: 20-pin PDIP (N), operating temperature range −40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A3 | Analog input | Selectable single-ended channels; source impedance ≤25 Ω required for normal sampling. |
| AGND (14, 18) | Analog ground | Reference return for analog circuitry; must be isolated from DGND except at single-point star ground. |
| AVDD (13, 19) | Analog supply | +5 V ±5% analog power rail; decoupling required near pins. |
| COMP | Internal compensation | Requires 0.1 µF capacitor to AGND for stability of internal op-amp stages. |
| CS | Chip select | Falling edge initiates SPI-mode conversion cycle; high state disables SDO and ignores SDI/SCLK. |
| CSTART | External sampling trigger | High-to-low transition starts sampling; low-to-high triggers hold/conversion - enables precise timing control. |
| DGND (6) | Digital ground | Return path for digital I/O; separate from AGND to minimize noise coupling into analog path. |
| DVDD (7) | Digital supply | +3 V to +5 V digital power; supports mixed-voltage system interfacing. |
| EOC/INT (4) | End-of-conversion interrupt | Falling edge signals ready data; cleared by CS↓, FS↑, or CSTART↓ - simplifies host polling/interrupt handling. |
| FS (2) | Frame sync | Rising edge initiates DSP-mode serial frame; tie to DVDD if unused in SPI configuration. |
| REFM (16) | Negative reference | Connect to AGND; establishes lower bound of ±10 V input range. |
| REFP (15) | Positive reference | Accepts 3.96–4.04 V; sets full-scale span with REFM - requires 10 µF || 0.1 µF decoupling. |
| SCLK (1) | Serial clock | Up to 25 MHz; clocks SDI/SDO and optionally serves as external conversion clock source. |
| SDI (3) | Serial data input | Accepts 4-bit command + optional 12-bit config; tie to DVDD for hardware-default initialization. |
| SDO (5) | Serial data output | 3-state MSB-first output; driven only when CS is low; holds last 12-bit result plus 4 don't-care bits. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in 8-word FIFO | Buffers up to eight 12-bit conversions - eliminates host latency bottlenecks during burst acquisition. |
| Programmable sampling period | Supports short (12 SCLK), long (44 SCLK), or CSTART-extended sampling - adapts to source impedance and bandwidth. |
| Hardware default mode | Auto-configures on power-up when SDI = DVDD - removes firmware dependency for basic operation. |
| Autopower-down mode | Reduces current to 20 µA between conversions - extends battery life in portable DAQ systems. |
| Integrated conversion clock | 6.5 MHz internal oscillator - eliminates need for external clock source while maintaining timing predictability. |
| Pseudodifferential input capability | Enables rejection of common-mode noise on A0–A3 pairs - improves SNR in noisy industrial environments. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage monitoring of PLC analog I/O modules with ±10 V sensor inputs (e.g., pressure transducers, RTD conditioners). IC Role / Device Role / Timing Role: Primary ADC front-end acquiring synchronized multi-channel data at 100+ KSPS with deterministic latency. Use Value: 12-bit resolution and ±0.7 LSB INL ensure traceable calibration against NIST standards; FIFO prevents data loss during host bus arbitration. |
Use Scenario: Digitizing stimulus-response waveforms in benchtop functional testers for analog IC validation. IC Role / Device Role / Timing Role: High-speed sampling node triggered by CSTART to capture transient events with sub-microsecond timing control. Use Value: 200-KSPS throughput and 72 dB SINAD support accurate characterization of amplifier THD and SNR up to 100 kHz. |
| Motor Drive Current Sensing | Energy Metering Front-End |
Use Scenario: Isolated phase current measurement in 3-phase inverters using shunt resistors and ±10 V amplifiers. IC Role / Device Role / Timing Role: Bipolar-input ADC capturing bidirectional current flow with hardware-synchronized sampling across all three phases. Use Value: ±10 V input range accommodates amplified shunt voltages directly; CSTART allows precise alignment with PWM dead-time windows. |
Use Scenario: Voltage and current channel digitization in Class 0.5 polyphase electricity meters with anti-tampering requirements. IC Role / Device Role / Timing Role: Dual-channel acquisition engine interfaced to metrology SoC via SPI, providing calibrated 12-bit samples. Use Value: Low 20 µA power-down current enables always-on metering; REFP/REFM precision enables stable 0.1% full-scale accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200-KSPS, SPI-only interface, no FIFO, 2.7–5.25 V supply | Limited to lower-accuracy applications; lacks bipolar input and hardware sampling control | Choose for cost-sensitive, low-resolution systems where ±10 V range and FIFO are unnecessary. |
| ADS8320EB | 16-bit resolution, 100-KSPS, SPI interface, no internal oscillator, external reference required | Higher precision but slower; requires external clock and reference design effort | Choose when ENOB >13 bits is mandatory and throughput ≥100 KSPS suffices. |
Compared with ADS7822U and ADS8320EB, the TLC2574IN uniquely balances 12-bit accuracy, 200-KSPS speed, ±10 V bipolar input, integrated FIFO, and hardware-configurable sampling - making it optimal for industrial DAQ where robustness, configurability, and moderate precision converge.
Availability
TLC2574IN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and energy metering front-ends requiring stable component supply across extended production lifecycles.
Supply support for TLC2574IN 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 ICs.
The TLC2574IN belongs to TI's precision SAR ADC product line, designed specifically for high-reliability industrial data acquisition systems demanding bipolar input, flexible serial interfacing, and low-power operation in harsh environments.
FAQ
What is the maximum sampling rate of the TLC2574IN?
The TLC2574IN achieves a maximum throughput of 200 KSPS in fixed-channel conversion mode (mode 00 or 01) with normal long sampling. This rate assumes optimal conditions: AVDD = 5 V, SCLK = 25 MHz, and analog source impedance ≤25 Ω. Channel-switching reduces effective throughput due to multiplexer settling time. The TLC2574IN specification sheet confirms this value under "Throughput rate" in Section 6.
Does the TLC2574IN support bipolar input signals?
Yes, the TLC2574IN supports true bipolar analog inputs from −10 V to +10 V using the REFP and REFM reference pins. When REFM is connected to AGND and REFP is set to 4 V, the device digitizes symmetrically around zero with 12-bit resolution. This capability is explicitly stated in the "Analog Input Range" specification and verified in the absolute maximum ratings and AC/DC performance tables for the TLC2574IN N-package variant.
How does the CSTART pin function on the TLC2574IN?
The CSTART pin on the TLC2574IN provides hardware-controlled asynchronous sampling: a high-to-low transition initiates sampling of the selected analog channel, and a subsequent low-to-high transition places the sample-and-hold in hold mode and starts conversion. Its low time determines sampling duration, enabling precise timing control independent of SCLK or CS. The TLC2574IN datasheet specifies this behavior in the Terminal Functions table and Figure 1 timing diagrams.
What package type is used for the TLC2574IN?
The TLC2574IN uses a 20-pin plastic dual in-line package (PDIP, N package), rated for operation from −40°C to +85°C. This through-hole package is confirmed in the "AVAILABLE OPTIONS" table on page 2 of the SLAS262C datasheet, which lists "TLC2574IN" under the "20-PDIP (N)" column with "−40°C to 85°C" temperature grade.
Is the TLC2574IN compatible with SPI microcontrollers?
Yes, the TLC2574IN is fully SPI-compatible when configured in CS-initiated mode: CS acts as slave select, SDI as MOSI, SDO as MISO, and SCLK as serial clock. The device accepts standard SPI framing and supports up to 25 MHz SCLK. Hardware default mode (SDI tied to DVDD) further simplifies integration with SPI hosts. This interoperability is documented in the "description" section and functional block diagram of the TLC2574IN datasheet.
TLC2574IN 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:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
TLC2574IN FAQ
1.How can I place an order for TLC2574IN through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2574IN 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 TLC2574IN reliable?
The price and inventory of TLC2574IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2574IN is usually 5 days.
3.What payment methods are accepted for TLC2574IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2574IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2574IN?
TLC2574IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2574IN 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 TLC2574IN?
For technical support, including TLC2574IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2574IN requirements.
6.How does Aetrix verify that TLC2574IN is sourced from the original manufacturer or authorized distributors?
All TLC2574IN 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 TLC2574IN meets industry standards.
7.What is the process for return or replacement of TLC2574IN?
All TLC2574IN units undergo pre-shipment inspection (PSI). If there is an issue with TLC2574IN, 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 TLC2574IN part is unused and in its original packaging.
Return procedure for TLC2574IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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